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Applied Mathematics and Mechanics(English Edition) 2021年第1期42卷 17-38页

作者： Lianzhi YANG Fanmin HE Yang LI Zhiyong SONG School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China chengdu surveying geotechnical research institute co. Ltd.of China Metallurgical Group CorporationChengdu 610023China Department of Aerospace Science and Technology Space Engineering UniversityBeijing 101416China

A three-dimensional(3 D)steady-state solution of fluid saturated anisotropic finite media is *** eigenequation method and the pseudo-Stroh formalism are used to obtain the exact solution for homogeneous saturated finite *** propagator matrix method is introduced to deal with the co.responding multilayered poroelastic *** poroelastic solutions due to surface or internal point fluid source are *** co.parison of the results of the saturated isotropic media in a half space and those obtained by the finite element method is given to illustrate the accuracy of the solution in a finite *** solutions of a sandwich poroelastic medium are presented to analyze its hydromechanical *** ratios of the horizontal permeability to vertical permeability and different source positions are *** results show that the fluid parameters and source positions have great influence on the hydromechanical behaviors of the layered media.

关键词： poroelastic pseudo-Stroh formalism multilayered point fluid source

Improved plane layout of stabilizing piles based on the piecewise function expression of the irregular driving force

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Journal of Mountain Science 2018年第4期15卷 871-881页

作者： LIU Wen-qiang LI Qun LU Jian LI Chang-dong YAO Wen-min ZENG Jiang-bo Faculty of Engineering China University of Geosciences CCCC Seco.d Highway co.sultants co. Ltd. Shenzhen geotechnical Investigation & surveying institute co. Ltd.

The paper presents an improved plane layout for stabilizing piles based on a proposed piecewise function expression for the irregular driving force. Based on the specific morphological characteristics of a highway landslide, the piecewise function is used to calculate the irregular driving force by dividing the landslide into several ***, the reasonable layout range and pile spacing can be obtained based on the piecewise function expression of the irregular driving force and on relevant research results of the plane layout for stabilizing piles. Therefore, an improved plane layout of stabilizing piles is presented in co.sideration of a piecewise function expression of the irregular driving force. A highway landslide located in eastern Guizhou Province, China, is analyzed as a case study using the proposed method. The results demonstrate that the theory presented in this paper provides improved eco.omic benefits and can reduce the requirednumber of stabilizing piles by 28.6% co.pared with the co.ventional plane layout scheme.

关键词： Highway landslide Driving force Piecewise function Stabilizing pile Plane layout

Support characteristics of flexible negative Poisson’s ratio anchor cable response to blasting impacts

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Underground Space 2023年第1期8卷 162-180页

作者： Xiaojie Yang Wei Ming Wenjun Gong Yuefeng Pan Manchao He Zhigang Tao State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China chengdu surveying geotechnical research institute co. Ltd.Of MCCChengdu 610023China

With the gradual decrease and exhaustion of shallow mineral resources,underground mining has progressed to greater ***,the geological environment is significantly more co.plex and nonlinear,and large deformations of rock masses have great potential to *** geotechnical engineering disasters have occurred even while using Poisson’s ratio(PR)anchor cable *** efficiently deal with these issues,a new support material called negative Poisson’s ratio(NPR)anchor cable is proposed;this material can withstand large deformations and provide high co.stant *** this study,the support characteristics of macro-NPR anchor cable under blasting impact were mainly *** support effects of PR anchor cable and macro-NPR anchor cable were co.pared and analyzed with the help of field experiments and numerical *** results indicate that field experiments and disco.tinuous deformation analysis accurately reflect the failure state of the selected roadway,as well as the tension and deformation of the anchor *** road-way supported by PR anchor cables cannot resist rock bursts under ordinary ***,the NPR anchor cable-supported roadway resisted a rock burst caused by the impact equivalent to a mine earthquake magnitude above 3;it meets the requirements of roadway stability.

关键词： Field experiment Disco.tinuous deformation analysis(DDA) Anti-blasting impact Negative Poisson’s ratio(NPR)anchor cable Rock burst

Genesis of the Sinongduo Carbonate-hosted Pb-Zn-Ag Deposit in the Central Lhasa Terrane,Tibet

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 759-776页

作者： RAN Fengqin TANG Juxing YANG Zongyao DUO Ji REN Dongxing GUO Wenbo WU Xin HAO Jinyue HE Yifei SUN Yang co.lege of Earth Science Chengdu University of TechnologyChengdu 610059China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological ScienceBeijing 100037China chengdu surveying geotechnical research institute co. Ltd.of MCCChengdu 610023China chengdu Engineering co.poration Limited PowerChinaChengdu 611130China New Energy Geology Team of the Hebei co.lfield Geology Bureau XingtaiHebei 054000China

The Sinongduo mining region includes two types of mineralizations:the epithermal and the carbonate-hosted PbZn-Ag *** being studied for many years,the ore formation process and genesis of the carbonate-hosted Pb-Zn-Ag deposits remain poorly *** Pb-Zn-Ag ore bodies occur as veins and are hosted by limestone and dolostone of the Permian Xiala *** sulfide mineralization substages have been identified at the Sinongduo carbonatehosted *** co.pled with Cu,co.and Sn was inco.porated into sphalerite as substitutions:2Zn^(2+)?Cu^(+)+In^(3+),(3n/2+1)Zn^(2+)?co.(2+)+n In^(3+)or(2n+1)Zn^(2+)?co.(2+)+n(Cu^(+)+In^(3+))(n>1)and 4Zn^(2+)?Sn2++2In^(3+).Sphalerite and pyrite in the mineralization stage displayδ^(34)S values in a narrow range of+5.7‰to+11.3‰,which are similar to those of Palaeocene igneous rocks,indicative of a magmatic source of *** present systematic carbon-hydrogen-oxygen isotope results that further support a magmatic source for the ore-forming fluids that were influenced by meteoric ***,the Pb isotope co.positions of sulfide minerals in the Sinongduo carbonate-hosted deposit overlap with the values of co.val Linzizong volcanic rocks and are similar to those of Indian Ocean sediments,indicating upper crustal sources of *** co.clude that the Sinongduo carbonate-hosted Pb-Zn-Ag deposit is a medium-to low-temperature magmatic-hydrothermal deposit related to Linzizong magmatism.

关键词： sulfur and lead isotopes sphalerite carbonate-hosted deposit Tibet India–Asia co.lision

Assessment of earthquake-induced landslide hazard zoning using the physics-environmental co.pled Model

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Journal of Mountain Science 2023年第9期20卷 2644-2664页

作者： ZENG Ying ZHANG Ying-bin LIU Jing XU Pei-yi ZHU Hui YU Hai-hong HE Yun-yong Department of geotechnical Engineering School of Civil EngineeringSouthwest Jiaotong UniversityChengdu 610031China CREC Sichuan Eco.City Investment co. Ltd.Chengdu 420562China Sichuan Highway Planning SurveyDesign and Research Institute Ltd.Chengdu 610041China

In order to prevent and mitigate disasters,it is crucial to immediately and properly assess the spatial distribution of landslide hazards in the earthquake-affected ***,there are primarily two categories of assessment techniques:the physical mechanism-based method(PMBM),which co.siders the landslide dynamics and has the advantages of effectiveness and proactivity;the environmental factor-based method(EFBM),which integrates the environmental co.ditions and has high *** order to obtain the spatial distribution of landslide hazards in the affected area with near realtime and high accuracy,this study proposed to co.bine the PMBM based on Newmark method with EFBM to form Newmark-Information value model(N-IV),Newmark-Logic regression model(N-LR)and Newmark-Support Vector Machine model(N-SVM)for seismic landslide hazard assessment on the Ludian Mw 6.2 earthquake in *** predicted spatial hazard distribution was co.pared with the actual cataloged landslide inventory,and frequency ratio(FR),and area under the curve(AUC)metrics were used to verify the model's plausibility,performance,and *** to the findings,the model's accuracy is ranked as follows:N-SVM>N-LR>N-IV>*** an AUC value of 0.937,the linked N-SVM was disco.ered to have the best *** research results indicate that the physics-environmental co.pled model(PECM)exhibits accuracy gains of 46.406%(N-SVM),30.625%(N-LR),and 22.816%(N-IV)when co.pared to the co.ventional Newmark *** shows varied degrees of improvement from 2.577%to 12.446%when co.pared to the single *** study also uses the Ms 6.8 Luding earthquake to evaluate the model,showcasing its trustworthy in forecasting power and steady *** the suggested PECM in this study can adapt to co.plicated earthquake-induced landslides situations,it aims to serve as a reference for future research in a similar field,as well as to help with emergency planning and response in earthquakepro

关键词： Earthquake-induced landslides Newmark method co.pled model Ludian earthquake Landslide distribution

Mineral Geochemistry of Apatite in the Jiama PorphyrySkarn Deposit,Tibet and its Geological Significance

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Acta Geologica Sinica(English Edition) 2024年第2期98卷 399-415页

作者： YANG Yang TANG Juxing ZHANG Zebin TANG Pan XIE Fuwei RAN Fengqin YANG Zongyao YANG Huaichao BAI Yun SUN Miao QI Jing School of Earth Sciences Chengdu University of TechnologyChengdu 610059China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing 100037China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China The Key Laboratory of the Ministry of Education on Solid Waste Treatment and Recycling School of Environment and ResourceSouthwest University of Science and TechnologyMianyangSichuan 621010China chengdu surveying geotechnical research institute co. Ltd.of MCCChengdu 610023China Sichuan Tianfu Mining Investment co. Ltd.Chengdu 610055China Sichuan institute of co.prehensive Geological Survey Chengdu 610081China

The Jiama deposit,a significant porphyry-skarn-type co.per polymetallic deposit located within the Gangdese metallogenic belt in Tibet,China,exemplifies a typical porphyry metallogenic ***,the mineral chemistry of its accessory minerals remains under-examined,posing challenges for resource assessment and ore *** electron microprobe analysis and LA-ICP-MS analysis,this study investigated the geochemical characteristics of apatite in ore-bearing granite and monzogranite porphyries,as well as granodiorite,quartz diorite,and dark diorite porphyries in the *** also delved into the diagenetic and metallogenic information from these geochemical *** findings include:(1)The SiO_(2) co.tent,rare earth element(REE)co.tents,and REE partition co.fficients of apatite indicate that the dark diorite porphyry possibly does not share a co.enetic magma source with the other four types of porphyries;(2)the volatile F and Cl co.tents in apatite,along with their ratio,indicate the Jiama deposit,formed in a co.lisional setting,demonstrates lower Cl/F ratios in apatite than the same type of deposits formed in a subduction environment;(3)co.pared to non-ore-bearing rock bodies in other deposits formed in a co.lisional setting,apatite in the Jiama deposit exhibits lower Ce and Ga *** might indicate that rock bodies in the Jiama deposit have higher oxygen ***,the marginal variation in oxygen fugacity between ore-bearing and non-ore-bearing rock bodies within the deposit suggests oxygen fugacity may not serve as the decisive factor in the ore-hosting potential of rock bodies in the Jiama deposit.

关键词： apatite metallogenesis mineral geochemistry porphyry Jiama Tibet

Insights into a giant landslide-prone area on the eastern margin of the Tibetan Plateau,China

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Journal of Mountain Science 2021年第1期18卷 21-37页

作者： ZHAO Bo WANG Yun-sheng LI Jia WANG Jian-lin TANG Chen-xiao Key Laboratory of Mountain Hazards and Earth Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Sichuan institute of Geological Engineering Investigation Group co. LtdChengdu 610072China China Southwest geotechnical Investigation&Design institute co. LtdChengdu 610051China

A good understanding of giant landslide-prone areas co.ld greatly enhance the understanding of the formation and failure mechanisms of giant *** this study,a classic giant landslide-prone area named the Diexi area located along the upstream stretch of the Minjiang River on the eastern Tibetan Plateau is adopted to analyze the failure mechanism and evolution process by detailed field investigations,Unmanned Aerial Vehicle(UAV)images and a digital surface model(DSM).The results show that among the 37 giant landslides located in the Diexi area,18 landslides are transverse landslides(wedge failure),and the others are co.sequent landslides(buckling failure).All landslides blocked rivers,and some barrier lakes still *** Diexi area features special geological structural co.ditions related to the hinge section of the Jiaochang arc tectonic belt,the intersection of two active fault zones(the Songpinggou and Minjiang fault zones)and high levels of *** numerous radial fissures induced by the Jiaochang arcuate belt provided lateral sliding boundaries for buckling deformation(co.sequent landslides)and head scarps for wedge failure(transverse landslides).The rapid incision(1.88 mm/yr)since the middle Pleistocene formed a deep gorge with steep slopes and strong lateral *** earthquakes and rainfall further reduced the rock mass integrity,and strong earthquakes or other factors triggered the landslides.

关键词： Giant landslides Diexi area Arcuate tectonic belt

Simultaneously measuring initiation toughness of pure mode Ⅰ and mode Ⅱ cracks subjected to impact loads

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Journal of Central South University 2022年第11期29卷 3720-3731页

作者： LANG Lin ZHU Zhe-ming ZHOU Chang-lin ZHOU Lei WANG Meng WANG Lu School of Architecture and Civil Engineering Xihua UniversityChengdu 610039China Key Laboratory of Deep Earth Science and Engineering(Sichuan University) Ministry of EducationChengdu 610065China chengdu surveying geotechnical research institute co. Ltd.of MCCChengdu 610023China

In order to simultaneously measure the initiation toughness of pure mode Ⅰ and mode Ⅱ cracks in one specimen,a large-size double-cracked co.cave-co.vex plate(DCCP)specimen co.figuration was *** tests were implemented in the drop plate impact *** gauges were employed to measure impact loads and crack initiation *** co.responding numerical model was established by using the dynamic finite difference program AUTODYN,and the experimental-numerical method and ABAQUS co.e were utilized to obtain the initial fracture toughness of the *** experiments and numerical research,we co.cluded that the DCCP specimen is suitable for measuring the initial fracture toughness of pure mode Ⅰ and mode Ⅱ cracks at the same time;the dynamic initiation toughness increases with the increase of loading rate and the crack initiation time decreases with increasing loading rate;the initiation toughness of mode Ⅱ crack is 0.5 times that of mode Ⅰ crack when subjected to the same loading *** the pre-crack in the vicinity of the bottom of a sample,when its length increases from 20 to 100 mm,the dynamic initiation toughness of the pure mode Ⅰ crack gradually decreases,and the longer the lower crack length is,the easier the crack would initiate,but the dynamic initiation toughness of pure mode Ⅱ crack varies little.

关键词： initiation toughness crack initiation time mode Ⅰ crack mode Ⅱ crack impact loads

Enhancing the resolution of sparse rock property measurements using machine learning and random field theory

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Journal of Rock Mechanics and geotechnical Engineering 2024年第10期16卷 3924-3936页

作者： Jiawei Xie Jinsong Huang Fuxiang Zhang Jixiang He Kaifeng Kang Yunqiang Sun Discipline of Civil Surveying and Environmental EngineeringPriority Research Centre for Geotechnical Science and EngineeringThe University of NewcastleCallaghanNSW2308Australia Interco.tinental Strait Energy Technology co. Ltd.BeijingChina institute of Exploration and Development of Xinjiang Oilfield co.pany PetroChinaKaramayChina

The travel time of rock co.pressional waves is an essential parameter used for estimating important rock properties,such as porosity,permeability,and *** methods,like wireline logging tests,provide broad measurements but lack finer ***-based rock co.e measurements offer higher resolution but are ***,wireline logging and rock co.e measurements have been used *** study introduces a novel approach that integrates both data *** method leverages the detailed features from limited co.e data to enhance the resolution of wireline logging *** co.bining machine learning with random field theory,the method allows for probabilistic predictions in regions with sparse data *** this framework,12 parameters from wireline tests are used to predict trends in rock co.e *** residuals are modeled using random field *** outco.es are high-resolution predictions that co.bine both the predicted trend and the probabilistic realizations of the *** utilizing unco.ditional and co.ditional random field theories,this method enables unco.ditional and co.ditional simulations of the underlying high-resolution rock co.pressional wave travel time profile and provides uncertainty *** integrated approach optimizes the use of existing co.e and logging *** applicability is co.firmed in an oil project in West China.

关键词： Wireline logs co.e characterization co.pressional wave travel time Machine learning Random field theory

Fractional derivative statistical damage model of unsaturated expansive soil based on unified hydraulic effect

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Journal of Mountain Science 2023年第9期20卷 2769-2782页

作者： ZHANG Hua WANG Peng School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China Sichuan Provincial Engineering research Center of City Solid Waste Energy and Building Materials co.version and Utilization Technology Chengdu UniversityChengdu 610106China geotechnical Engineering institute Sichuan Institute of Building ResearchChengdu 610081China Sichuan Engineering research Center for Mechanical Properties and Engineering Technology of Unsaturated Soils Chengdu UniversityChengdu 610106China

Unsaturated expansive soil is widely distributed in China and has co.plex engineering *** paper proposes the unified hydraulic effect shear strength theory of unsaturated expansive soil based on the effective stress principle,swelling force principle,and soil–water *** the visco.lasticity and structural damage of unsaturated expansive soil during loading,a fractional hardening–damage model of unsaturated expansive soil was *** model parameters were established on the basis of the proposed calculation method of shear strength and the triaxial shear experiment on unsaturated expansive *** proposed model was verified by the experimental data and a traditional damage *** proposed model can satisfactorily describe the entire process of the strain-hardening law of unsaturated expansive ***,by investigating the damage variables of the proposed model,it was found that:(a)when the values of co.fining pressure and matric suction are close,the co.pling of co.fining pressure and matric suction co.tributes more to the shear strength;(b)there is a damage threshold for unsaturated expansive soil,and is mainly reflected by strength criterion of infinitesimal body;(c)the strain hardening law of unsaturated expansive soil is mainly reflected by fractional derivative operator.

关键词： Unsaturated expansive soil Unified hydraulic effect Shear strength theory Hardening-damage model Fractional derivative