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Back analysis of long-term stability of a 92 m span ancient quarrying cavern

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第2期9卷 350-363页

作者： Yanjun Shang lihui li Wantong He Luqing Zhang tianbin li Zhifa Yang Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology

Long-term stability of large-span caverns is a challenging issue for design and construction of underground rock *** Heidong cavern group consisting of 21 caverns was constructed about 1400 years ago for quarrying in massive Cretaceous *** cavern No.5 of the Heidong cavern group is characterized by an unsupported span up to 92 m,with the overburden thickness of only 3-25 *** analyze its long-term stability,a detailed investigation was conducted to obtain its geometry and rock mass characteristics,and to monitor surrounding rock *** on field survey and laboratory tests,numerical simulations were performed using the finite difference code FLAC;.The analysis results revealed that for the long-term stability of the cavern No.5,some major factors should be carefully considered,such as cavern excavation method in hard massive rocks,site investigation using trial pits,tools like short iron chisel and hammer for manual excavation,geometric dome roof,and waste rocks within abutment or on the *** highlights of the technologies obtained from this large-scale ancient underground project can provide reference for other similar project excavations in practice.

关键词： Cretaceous tuff Heidong quarry Largest span Long-term stability Manual excavation

Distribution law and susceptibility of geohazards across a gradient belt of the Western Sichuan Plateau

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Journal of Mountain Science 2024年第6期21卷 1849-1867页

作者： li tianbin WANG Jianfeng HE Chaoyang MENG Lubo li Chaofei MA Junjie WEI Daqiang College of Environment and Civil Engineering Chengdu University of TechnologyChengdu 610059China State Key Laboratory of Geohazard Prevention and Geo-environment Protection Chengdu University of TechnologyChengdu 610059China

Across a gradient belt of the Western Sichuan Plateau,geohazards have seriously limited economic and social *** to incomplete statistics,15,673 geohazards have been recorded in the study *** order to mitigate the threat of geohazards to human engineering activities in the region,an overall understanding of the distribution pattern of geohazards and susceptibility assessment are *** this paper,a gradient belt of the Western Sichuan Plateau and its zoning criteria were ***,on the basis of relief amplitude,distance to faults,rainfall,and human activities,three indicators of endogenic process were introduced:Bouguer gravity anomaly gradient,vertical deformation gradient,and horizontal deformation ***,the distribution patterns of geohazards were investigated through mathematical statistics and ArcGIS *** randomly selecting 10,449 hazards,a geohazard susceptibility map was generated using the Information Value(IV)***,the IV model was validated against 5224 hazards using the Area Under Curve(AUC)*** results show that 47.6%of the geohazards were distributed in the zone of steep *** showed strong responses to distance to faults,human activities,and annual *** distribution of geohazards in the gradient belt of the Western Sichuan Plateau is more sensitive to vertical internal dynamics factors(such as vertical deformation gradient and Bouguer gravity anomaly gradient)without any apparent sensitivity to horizontal internal dynamics *** areas of high and very-high risk account for up to 32.22%,mainly distributed in the Longmenshan and Anning River *** to the AUC plot,the success rate of the IV model for generating the susceptibility map is 76%.This susceptibility map and geohazard distribution pattern can provide a reference for geological disaster monitoring,preparation of post-disaster emergency measures,and town planning.

关键词： Gradient belt Geohazards Distribution law Bouguer Gravity anomaly gradient Vertical deformation gradient Susceptibility

Deformation and Failure Mechanism of Phyllite under the Effects of THM Coupling and Unloading

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Journal of Mountain Science 2012年第6期9卷 788-797页

作者： MENG Lubo li tianbin XU Jin CHEN Guoqing MA Hongming YIN Hongyu State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China School of Water Resources and Hydropower Sichuan UniversityChengdu 610065China

Although the study of TM(Thermo Mechanics),HM(Hydraulic-Mechanics) and THM(Thermo-Hydraulic-Mechanics) coupling under a loading test have been under development,rock failure analysis under THM coupling and unloading is an emerging *** on a high temperature triaxial unloading seep test for phyllite,this paper discusses the deformation and failure mechanism of phyllites under the "H M,T→H,T→M" incomplete coupling model with unloading *** results indicate that the elastic modulus and initial permeability decrease and the Poisson's ratio increases with increasing temperature;the elastic modulus decreases and the Poisson's ratio and initial permeability increase with increasing water *** the unloading process,rock penetrability is small at the initial elastic deformation phase,but the penetrability increases near the end of the elastic deformation phase;mechanisms involving temperature and water pressure affect penetrability *** failure occurs from the initial thermal damage of the rock materials,splitting and softening(which is caused by pore water pressure),and the pressure difference which is formed from the loading axial pressure and unloading confining *** phyllite failure mechanism is a transtensional(tension-shearing) failure.

关键词： Phyllite Mechanical characteristics Penetrability Failure mechanism Loading test Thermo-Hydraulic-Mechanics(THM)

A Physical Simulation Test for the RockBurst in Tunnels

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Journal of Mountain Science 2011年第2期8卷 278-285页

作者： li tianbin WANG Xiangfeng MENG Lubo State Key Laboratory of Geohazard Prevention & Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China Sichuan Communication Surveying &Design Institute Chengdu 610017China

According to the test results of the physical and mechanical properties of similar materials in various quality mixture, a type of material with obvious tendency of rockburst was selected to produce a large-size model to simulate rockburst phenomena in tunnels. The prototype model comes from a typical section of diversion tunnels in Jinping Hydropower Station in China. The simulation of excavating tunnels is carried out by opening a hole in the model after loading. The modeling results indicated that under the condition of normal stresses in the model boundaries the arch top, spandrel and side walls of the tunnel produced an obvious jump reaction of stress and strain and the acoustic emission counts of the surrounding rock also increased rapidly in a different time period after the "tunnel" excavation, showing the clear features of rockburst. The spalling, buckling and breaking occurred in the surrounding rock of model in conditions of over loading. It is concluded that the modeling tunnel segment in Jinping Hydropower Station is expected to form the tensile rockburst with the pattern of spalling, buckling and breaking.

关键词： Rockburst Physical simulation Similar materials (Gypsum Cement Sand Water) Strain jump Spalling Buckling Breaking

Numerical Modeling of Giant Badu Landslide Reactivated by Excavation in China

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Journal of Earth Science and Engineering 2013年第2期3卷 109-115页

作者： Demin Xue tianbin li Yongxing Wei State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China China Railway Second Engineering Group Co. Ltd Chengdu 610031 China

In southwest of China, landslide reactivation caused by excavation has caused huge property and human losses, and posed severely threaten to the construction and operation of the man-made linear structures. A reactivated landslide is a complex process. The engineering practices have shown that a correct understanding of the reactivated mechanism of an ancient giant landslide is significant for the landslide mitigation. In this paper, a case study of the ancient Badu landslide that underwent multiple reactivations during the construction of Nanning-Kunming railway was discussed. The landslide characteristics are described and the reactivated features and progressive failure of the landslide are revealed. The reactivated mechanism of the landslide is analyzed by use of geological process analysis method and is simulated using the 3D FEM （finite element method）. At last, the reactivated mechanism mode of Badu giant landslide is put forward, namely ＂creeping-tensile cracking-shear breaking with zoning and grading features＂. The understanding of this kind of reactivated mechanism had helped engineers to take efficient and economic mitigation measures to stabilize the landslide.

关键词： Landslide hazard reactivated mechanism landslide mitigation.

Carbon and oxygen isotopes analyses for the Sinian carbonates in the Helan Mountain, North China

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Chinese Science Bulletin 2013年第4期58卷 3943-3955页

作者： YANG Jie ZENG ZuoXun CAI XiongFei li ZhiYong li tianbin MENG Fang HE WenJian Faculty of Earth Sciences China University of Geosciences Three Gorges Geotechnical Consultants Co. Ltd. Huazhong Tectonomechanical Research Center Ningxia Monitoring Institute of Land Resources Survey Ningxia Institute of Geological Survey Geological Team 292 of the Guangdong Province Nuclear Industry Geological Bureau

We conducted detailed studies of the Sinian carbonates from the Helan Mountain,Ningxia by both field investigation and laboratory analyses of carbon and oxygen *** carbon isotopic compositions of the Sinian Zhengmuguan Formation shows variations with regularity in the five studied sections,theδ13C values all gradually decrease from bottom to top,with a total range from 4.51‰to 0.11‰,and the biggest negative excursion reaches up to 6.88‰.In addition,abundant macro-body fossils were also found from the Tuerkeng Formation in this study,similar to those found from the Dengying Formation in the South China *** observation firmly constrained the age for the Zhengmuguan and Tuerkeng formations to the Sinian *** we interpreted that the Zhengmuguan Formation formed during a glacial period when the extremely cold climate substantially decreased the amount of burial of organic matter in the ocean and thus led to the general negativeδ13C *** increasingδ13C values in the Tuerkeng Formation dolomites imply the ending of the glacial period in the Zhengmuguan epoch,biological recovery and increase of organic matter burial in the ocean occurred during this *** our obtained carbon and oxygen isotopes of the Zhengmuguan and Tuerkeng formations with those of coeval carbonate successions from other places all over the world,the Zhengmuguang-aged glacial deposits might be deposited after the Gaskiers *** study provides important information for paleo-ocean,paleogeographic and biological evolution in the North China Block during the Ediacaran period and adds new carbon and oxygen isotopes data for the global Sinian carbon-oxygen isotopes dataset.

关键词：氧同位素分析中国北方碳酸盐震旦系贺兰山冰川沉积物碳同位素组成生物恢复

砂岩劈裂裂隙多因素影响下可视化渗流规律研究

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土木工程学报 2020年第10期53卷 106-119页

作者：刘杰黎照李天斌李政湖北省地质灾害防治工程技术研究中心湖北宜昌443002 成都理工大学地质灾害防治与地质环境保护国家重点实验室四川成都610059

基于自主研发的可视化试验装置,应用颜色示踪技术,进行空间多角度砂岩裂隙渗流试验;通过采用图像不同灰度面积处理技术、裂隙面积分析方法,进行图像分区并统计其渗流面积,首次从可视化角度得出在不同法向应力、渗透压、倾角等多因素影... 详细信息

基于自主研发的可视化试验装置,应用颜色示踪技术,进行空间多角度砂岩裂隙渗流试验;通过采用图像不同灰度面积处理技术、裂隙面积分析方法,进行图像分区并统计其渗流面积,首次从可视化角度得出在不同法向应力、渗透压、倾角等多因素影响下渗流扩散面积比关系式,指出裂隙渗流加速汇集效应和优势扩散面积区域。并基于裂隙面三维形态测试数据,获得裂隙面粗糙度精确JRC值,利用该JRC值得到裂隙面二维粗糙度云图,并与渗流扩散面积图像相结合,从而确定渗流优势路径范围,指出低粗糙区域是渗流的主要过流路径,进而解释了渗流扩散区域会随倾角增大而减小原因,为隧道工程实践中的防渗封堵提供依据。

关键词：可视化渗流渗流扩散面积加速汇集效应裂隙粗糙度JRC值优势路径

基于拟牛顿近似二阶法的岩土工程系统可靠性分析

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岩石力学与工程学报 2018年第3期37卷 726-733页

作者：曾鹏陈语李天斌成都理工大学地质灾害防治与地质环境保护国家重点实验室四川成都610059

岩土工程问题往往存在多种失效模式,需要进行系统性的分析与评价,而目前的系统可靠性方法尚不能在精度与计算量之间达到很好的平衡,据此提出一种更加高效的系统可靠度计算方法。此方法基于2种拟牛顿近似算法的耦合,首先利用HLRF-BFGS算... 详细信息

岩土工程问题往往存在多种失效模式,需要进行系统性的分析与评价,而目前的系统可靠性方法尚不能在精度与计算量之间达到很好的平衡,据此提出一种更加高效的系统可靠度计算方法。此方法基于2种拟牛顿近似算法的耦合,首先利用HLRF-BFGS算法确定各极限状态方程的验算点以及单位方向矢量,然后采用SR1算法逼近海森矩阵从而得到精度优良的二阶可靠度指标。在此基础上,通过改进线性化法进一步使用每个极限状态方程的二阶可靠度指标及单位方向矢量计算系统失稳概率。以半重力式挡土墙和多层土坡为算例,通过与经典系统可靠性方法计算结果的对比分析,表明所采用的拟牛顿近似二阶法能够凭借少于经典一阶法(FORM)的计算量得到与经典二阶法(SORM)相当的系统失稳概率计算精度,证明此算法的高效性与准确性,在岩土工程系统可靠性问题中具有较好的应用前景。

关键词：边坡工程二阶可靠度法拟牛顿近似法系统可靠性半重力式挡土墙层状边坡

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某海洋气田中心平台三甘醇脱水系统模拟研究

石油与天然气化工 2019年第6期48卷 30-34页

作者：李天斌中海石油(中国)有限公司湛江分公司

使用Aspen HYSYS软件,对某海洋气田中心平台正在运行的三甘醇(TEG)脱水装置进行模拟计算。在天然气处理规模为175×104 m^3/d(15.6℃,101.325 kPa),操作压力(G)9000 kPa,操作温度35℃的条件下,对贫TEG循环量及其质量分数、再沸器温度和... 详细信息

使用Aspen HYSYS软件,对某海洋气田中心平台正在运行的三甘醇(TEG)脱水装置进行模拟计算。在天然气处理规模为175×104 m^3/d(15.6℃,101.325 kPa),操作压力(G)9000 kPa,操作温度35℃的条件下,对贫TEG循环量及其质量分数、再沸器温度和汽提气流量进行模拟优化,得到最佳运行参数,并应用于生产操作。在此操作条件下,天然气脱水系统运行正常,干气中水质量浓度不大于30 mg/m^3,满足干气外输要求。

关键词： Aspen HYSYS 三甘醇脱水贫甘醇循环量质量分数再沸器温度汽提气流量