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Rainfall-induced landslide stability analysis in response to transient pore pressure——A case study of natural terrain landslide in Hong Kong

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science china(Technological sciences) 2003年第z1期46卷 52-68页

作者： LAN Hengxing, ZHOU Chenghu C. F. LeeWANG Sijing & WU Faquan State Key Laboratory of Natural Resources and environmental System, Institute of Geographical Sci-ences and Natural Resources Research, Chinese Academy of sciences, beijing 100101, china Department of civil engineering, Hong Kong university, Hong Kong, china 3. Institute of Geology and Geophysics, Chinese Academy of sciences, beijing 100029, china Chinese Acad Sci State Key Lab Nat Resources & Environm Syst Inst Geog Sci & Nat Resources Res Beijing 100101 Peoples R China Univ Hong Kong Dept Civil Engn Hong Kong Hong Kong Peoples R China Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China

Transient pore pressure in response to short intense rainfall process plays an important role in shallow landslide occurrence. Using GIS technology, we carry out the rainfall-induced landslide stability analysis in response to transient pore pressure by means of transient and unsaturated rainfall infiltration modeling. A case study is performed on the shallow landslide stability analysis in Hong Kong. Detailed analysis and discussion reached some useful conclusions on the tempo-spatial behavior and characteristics of slope stability response and pore pressure response to typical rainfall process. Comparison analysis is performed on some important issues including landslide stability response in different types of slopes with different hydraulic properties, antecedent rainfall and landslide stability, and the nature of pore pressure response time. These studies might give us an important insight into landslide tringgering mechanism and the hydrological process in response to rainfall, and provide systematic information and evidences for effective risk assessment and warning system establishment.

关键词： rainfall-induced landslide, transient pore pressure, landslide stability in response to rainfall, GIS.

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Protein concentration determination in the PEGylation process

Protein concentration determination in the PEGylation proces...

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第三届全国化学工程与生物化工年会

作者： Zheng Chunyang Zhang peng Zai Yanqin Ma Guanghui Su Zhiguo (National Key Laboratory of Biochemical engineering, Institute of Process engineering,Chinese Academy of sciences, P.O. Box 353, beijing 100080, china Graduate university of Chinese Academy of sciences, beijing, 100049, china civil and environmental engineering school, university of science and technology of beijing, beijing 100083, china)

＜正＞PEGylation technology is increasingly important. The protein concentration determination is close related to the reaction, separation and characterization of the final product in the PEGylation process. To ensure the research and quality control of PEGylation process, in this study, Human serum albumin （HSA） and recombinant human granulocyte-colony stimulating factor （rhG-CSF） were chosen as model proteins and modified by SC-PEG5K, SC-PEG10K. and SC-PEG20K. respectively, to detenninate the effect of activating method and the chain-length of PEG reagent on the determination of protein concentration. The effect of the salts, used in the common purification methods of PEGylated proteins was also determined. The results indicated that Lowry method is interfered by N-hydroxysuccinimide （NHS） that produced when using SC-PEG as PEG reagent, however, NaCl, Na2SO4 and （NH4）SO4 （used in ion-exchange, size-exclusion, and hydrophobic interaction chromatography, respectively） interfered the determination of Bradford method. Therefore, it is proposed that Bradford method is selected to determine the samples in the reaction stage, while Lowry method is selected to study the samples in purification stage. This procedure was used to determination the protein concentration in the practical PEGylation process of first modifying rhG-CSF using SC-PEG20K and then separating the mono-PEGylated rhG-CSF using ion exchange chromatography, by comparison with the Bradford or Lowry method, and satisfactory results were obtained in both the characterization of final product and the evaluation of the separation process.

关键词： PEGylation process Bradford method Lowry method SC-PEG

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STABILITY ANALYSIS OF PILLARS IN CONSIDERATION OF RHEOLOGICAL BEHAVIOUR OF ROCK

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Journal of Wuhan university of technology(Materials science) 1995年第1期10卷 30-35页

作者：刘沐宇池秀文 Wuhan Univ of technology Wuhan China

The mined-out area of a gypsum mine is right un-derneath civil constructions of a township, threatening the safety of the latter. To evaluate the long-term stability of the mined-out area, a visco-elastic plastic finite element analysis is carried out,combined with in situ measurements. The visco-elastic plastic coefficients have been determined through laboratory rock creep tests. Noticing the lim-itations of conventional element failure criteria,the authors proposed a new method to evaluate the stability of the element.i. e. ,by a si-multaneous control of the energy density and strain of the element. Computation showed that at stable state,one third of the pillars are in the visco-plastic state,the rest of the pillars ,the roof and floor are still in the visco-elastic state. The stress concentration coefficient at the boundary of pillars and roof is 2. 3,and the maximum verti-cal stress on the pillars is 11. 8 MPa. Data measured on site are con-sistent with the computation results, indicating that the proposed cal-culation method is correct. Therefore, the current mined-out area is stable,and the dimension of pillars is reasonable. The next-step ex-traction work should be carried out maintaining the current parame-ters,with only a moderate increase in pillar sizes to enhance the sta-bility of the pillars.

关键词： visco-elastic plastic finite element pillar stabil- ity rock rheology stability criteria

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考虑辐射阻尼的土—结构相互作用体系等效输入

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岩土力学 2016年第S1期37卷 583-590页

作者：雷素素高永涛潘旦光北京科技大学土木与环境工程学院北京10083 同济大学土木工程防灾国家重点实验室上海200092

为考虑土-结构相互作用对输入地震波的影响,基于两步法思想,建立了考虑辐射阻尼效应的等效输入地震波。在该种方法中,将单自由度体系的基础地震反应为上部结构的输入,然后用状态空间法计算考虑土-结构相互作用后体系阻尼比的变换情况,... 详细信息

为考虑土-结构相互作用对输入地震波的影响,基于两步法思想,建立了考虑辐射阻尼效应的等效输入地震波。在该种方法中,将单自由度体系的基础地震反应为上部结构的输入,然后用状态空间法计算考虑土-结构相互作用后体系阻尼比的变换情况,用以修正上部结构的阻尼系数,从而利用刚性基础的反应近似计算土-结构相互作用的影响。对一个单自由度体系和一个5层框架结构进行计算分析,算例分析表明,直接利用自由场的地震波或基岩波作为上部结构的输入,计算误差甚至超过100%,而两步法可使体系的计算误差小于10%,采用修正阻尼系数的两步法,误差将小于5%,满足工程需要。

关键词：辐射阻尼土-结构相互作用等效输入地震反应

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Self-healing of engineered cementitious composites at simulated summer conditions

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Rare Metals 2007年第S1期26卷 267-273页

作者： LEPECH M.D Department of civil and environmental engineering University of MichiganAnn ArborMI 48109-2125USA

Self-healing of engineered cementitious composites(ECC) subjected to a cyclic drying and wetting regime simulated summer outdoor environment was investigated in this *** tension tests were used to generate multiple cracks in ECC specimens deformed to varying tensile *** quantify self-healing,resonant frequency measurements were conducted throughout drying-wetting cycles followed by tensile testing of self-healing ECC *** was found that through self-healing the resonant frequency of ECC can recover 81% to 90% of initial values while showing a distinct rebound in stiffness of cracked ECC after *** specimens pre-loaded to high levels of strain between 2% and 3%,the tensile strain after self-healing can recover from 1.8% to 2.2%.Also,the effects of temperature during cyclic regime can lead to an increase in the ultimate strength of the material while slightly decreasing the strain-hardening capacity of ECC due to further hydration of unreacted cement and fly ash.

关键词： ECC self-healing cyclic drying and wetting resonance frequency tensile stress tensile strain

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Surrogate modeling for unsaturated infiltration via the physics and equality-constrained artificial neural networks

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Journal of Rock Mechanics and Geotechnical engineering 2024年第6期16卷 2282-2295页

作者： peng Lan Jingjing Su Sheng Zhang school of civil engineering Central South UniversityChangsha410075China Discipline of civil Surveying and Environmental EngineeringPriority Research Centre for Geotechnical Science and EngineeringThe University of NewcastleCallaghanNSW2308Australia Qinghai university Qinghai810016China

Machine learning(ML)provides a new surrogate method for investigating groundwater flow dynamics in unsaturated *** pure data-driven methods(*** neural network,DNN)can provide rapid predictions,but they do require sufficient on-site data for accurate training,and lack interpretability to the physical processes within the *** this paper,we provide a physics and equalityconstrained artificial neural network(PECANN),to derive unsaturated infiltration solutions with a small amount of initial and boundary *** takes the physics-informed neural network(PINN)as a foundation,encodes the unsaturated infiltration physical laws(*** equation,RE)into the loss function,and uses the augmented Lagrangian method to constrain the learning process of the solutions of RE by adding stronger penalty for the initial and boundary *** unsaturated infiltration cases are designed to test the training performance of PECANN,***-dimensional(1D)steady-state unsaturated infiltration,1D transient-state infiltration,two-dimensional(2D)transient-state infiltration,and 1D coupled unsaturated infiltration and *** predicted results of PECANN are compared with the finite difference solutions or analytical *** results indicate that PECANN can accurately capture the variations of pressure head during the unsaturated infiltration,and present higher precision and robustness than DNN and *** is also revealed that PECANN can achieve the same accuracy as the finite difference method with fewer initial and boundary training ***,we investigate the effect of the hyperparameters of PECANN on solving RE *** provides an effective tool for simulating unsaturated infiltration.

关键词： Richards equation(RE) Unsaturated infiltration Data-driven solutions Numerical modeling Machine learning(ML)

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Feasibility study of highwall mining in north surface mine of Yima Coal Corporation,china

Feasibility study of highwall mining in north surface mine o...

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中国科学院地质与地球物理研究所2003学术年会

作者： Guoming Cheng~(1)),Sijing Wang~(1)),and Meifeng Cai~(2)) 1) Institute of Geology and Geophysics,Chinese Academy of sciences,beijing 100029.china 2) civil and environmental engineering school.university of science and technology beijing.beijing 100083.china

Yima Coal Corporation is considering to adopt highwall mining method with auger machine to recover coal from north surface pit that has reached final highwall *** major geomechanical issues associated with auger mining are highwall and pillar *** on the field investigation and laboratory test results of mechanical parameters,numerical modeling is carried out to assess the stability of highwall and *** measurements of highwall deformation have been used to validate and ensure the confidence for the development of realistic *** results of numerical modeling show that the mining method is feasible for mining the seam of 10 m thickness in north surface coal mine.

关键词： highwall mining surface mine stability evaluation feasibility study

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FLOATING RATE OF FRAZIL ICE PARTICLES IN FLOWING WATER IN BEND CHANNELS——A THREE-DIMENSIONAL NUMERICAL ANALYSIS

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Journal of Hydrodynamics 2010年第1期22卷 19-28页

作者： WANG Jun LI Qing-gang SUI Jue-yi school of civil engineering Hefei University of Technology Hefei 230009 China environmental engineering Program University of Northern British Columbia British Columbia Canada V2N4V9

In this article, based on the theory of two-phase flow and laboratory data, a three-dimensionally model is developed to simulate the floating rates of frazil ice particles in water under covered condition. The Lagrangian trajectory method is used in the three dimensional simulation for floating rates of fxazil ice particles along a 180° bend channel. The velocity profiles in longitudinal and transverse directions, the turbulence intensity, and the residual pressure are simulated. Under the condition of gravitational similarity, the simulated floating rates of frazil ice particles in the model bend channel and the prototype bend channels are compared. Results indicate that the profiles for floating rates of ice particles for flows in the model channel are similar to those in the prototype bend channels. The simulated floating rates of ice particles are clearly higher along the convex bank than along the concave bank at each cross section. For the prototype bend channel in a large model scale, the variation of floating rate across each cross section is relatively small.

关键词： frazil ice particles model scale floating rate two-phase flow bend channel ice accumulation (ice jam)

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Electrical stress and acid orange 7 synergistically clear the blockage of electron flow in the methanogenesis of low-strength wastewater

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environmental science and Ecotechnology 2024年第4期20卷 291-299页

作者： Ze-Chong Guo Min-Hua Cui Chun-Xue yang Hong-Liang Dai Tong-Yi yang lin-Zhi Zhai Yong Chen Wen-Zong Liu Ai-Jie Wang school of environmental and Chemical engineering Jiangsu University of Science and TechnologyZhenjiang212100China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China Jiangsu Key Laboratory of Anaerobic Biotechnology Jiangnan UniversityWuxi214122China school of civil and environmental engineering Harbin Institute of TechnologyShenzhen518055China school of Geography and Tourism Harbin UniversityHarbin150001China school of environmental science and engineering Huazhong University of Science and TechnologyWuhan430074China

Energy recovery from low-strength wastewater through anaerobic methanogenesis is constrained by limited substrate *** development of efficient methanogenic communities is critical but *** we develop a strategy to acclimate methanogenic communities using conductive carrier(CC),electrical stress(ES),and Acid Orange 7(AO7)in a modified *** synergistic integration of CC,ES,and AO7 precipitated a remarkable 72-fold surge in methane production rate compared to the *** increase was attributed to an altered methanogenic community function,independent of the continuous presence of AO7 and ***7 acted as an external electron acceptor,accelerating acetogenesis from fermentation intermediates,restructuring the bacterial community,and enriching electroactive bacteria(EAB).Meanwhile,CC and ES orchestrated the assembly of the archaeal community and promoted electrotrophic methanogens,enhancing acetotrophic methanogenesis electron flow via a mechanism distinct from direct electrochemical *** collective application of CC,ES,and AO7 effectively mitigated electron flow impediments in low-strength wastewater methanogenesis,achieving an additional 34%electron recovery from the *** study proposes a new method of amending anaerobic digestion systems with conductive materials to advance wastewater treatment,sustainability,and energy self-sufficiency.

关键词： Methanogenesis Conductive carrier Electrical stress Acid orange 7 Electron transfer

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降雨入渗对板岩边坡稳定的影响及加固措施研究

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岩土力学 2015年第S2期36卷 545-550页

作者：乔兰姜波庞林祥崔明北京科技大学土木与环境工程学院北京100083 中国电力工程顾问集团华北电力设计院工程有限公司北京100120 武警水电部队第一总队第一支队河北唐山063000

板岩边坡在国内边坡工程中较为常见,常伴有倾倒变形,在其特有的结构性质影响下边坡失稳频发。通过对苗尾水电站右坝基板岩边坡失稳现象分析,研究了板岩边坡在降入入渗情况下的变形特征,在该基础之上运用稳定理论探讨降雨入渗影响边坡失... 详细信息

板岩边坡在国内边坡工程中较为常见,常伴有倾倒变形,在其特有的结构性质影响下边坡失稳频发。通过对苗尾水电站右坝基板岩边坡失稳现象分析,研究了板岩边坡在降入入渗情况下的变形特征,在该基础之上运用稳定理论探讨降雨入渗影响边坡失稳机制,结合实例分析提出了板岩边坡失稳加固关键措施,并通过现场实际检验效果。研究结果表明,板岩边坡的节理特性、开挖坡比、降雨入渗是造成板岩边坡失稳的关键因素,进行加固必须从防雨下渗和束腰加固着手。苗尾水电站右坝基板岩边坡加固后经受住了汛期和炮震的影响,说明边坡失稳认识及加固措施较为准确,对于类似工程具有一定的参考价值。

关键词：板岩边坡暂态水压力苗尾水电站失稳机制倾倒变形

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