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Spatial and Temporal Stress Variations before and after the 2008 Wenchuan M_(w)7.9 Earthquake and its Implications:A Study based on Borehole Stress Data

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Acta Geologica Sinica(English Edition) 2023年第1期97卷 226-242页

作者： MENG Wen lin weiren CHEN Qunce LI Yonghua Institute of Geophysics China Earthquake AdministrationBeijing 100081China Key Laboratory of Earthquake Source Physics China Earthquake AdministrationBeijing 100081China Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesInstitute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China Graduate School of Engineering Kyoto UniversityKyotoJapan

In situ stress measurement data was analyzed to estimate the temporal and spatial stress variations at shallow depths in the Longmenshan fault zone(LMSF),prior to and following the 2008 Wenchuan earthquake(WCEQ).Analysis of the stress field related to fault strength and behavior is useful for understanding geodynamic processes and conducting hazard *** shallow stress changes after the WCEQ show clear along-strike *** of stress orientation rotations have a negative correlation with the horizontal principal stress ratios and the WCEQ apparently reduced the magnitude difference between horizontal principal *** stress magnitudes and orientation distribution relative to the fault strike into account,we propose an intermediate-strength of LMSF,with a friction coefficient generally constrained between 0.35 and *** addition,high-pressure fluids in the fault zone reduce the effective normal stress and to a certain degree weaken the fault *** accumulated stress over a certain period following release of the WCEQ indicates the start of another earthquake *** changing crustal stress field makes the LMSF stable or slipping optimally during geodynamic *** segmentation feature of the shallow crustal stress field in the LMSF may imply a different tectonic loading and seismic release processes along the *** southwestern section to the epicenter of the WCEQ favors the occurrence of future earthquakes,as highμm in a state of critical failure was present in this area,which indicates that the Wenchuan and Lushan earthquakes did not release the accumulated stress to a sufficient extent there.

关键词： stress variation in situ stress measurement fault strength hazard assessment Longmenshan fault zone

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Model-based offline reinforcement learning framework for optimizing tunnel boring machine operation

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Underground Space 2024年第6期19卷 47-71页

作者： Yupeng Cao Wei Luo Yadong Xue weiren lin Feng Zhang Department of Urban Management Kyoto UniversityKyoto 615-8540Japan Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China

Research on automation and intelligent operation of tunnel boring machine(TBM)is receiving more and more attention,benefiting from the increasing construction ***,most studies on TBM operations optimization were trained by the labels of human drivers’decisions,which were subjective and *** a result,the control parameters suggested by these models could hardly surpass the performance of a human driver,even the possibility of subjective incorrect *** that the geomechanical feedback to TBM under drivers’actions is objective,in this paper,a transformer-based model called the geological response for tunnel boring machine(GRTBM),is proposed to learn the relationship between operation-adjust and TBM monitoring ***,with the model-based offline reinforcement learning,this paper provided a novel approach to optimizing the TBM excavation *** decision processes,recorded in the Yin-song TBM project for a waterway tunnel in Jilin Province of China,were used for the validation of the *** adopting an implicit perception of geological conditions in the GRTBM model,the suggested method achieved the desired state within a single action,greatly outperformed the practical adjustments where 500 s were taken,revealing the fact that the proposed model has the potential to surpass the capability of human beings.

关键词： TBM Reinforcement learning Transformer Data mining

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CFD simulation on the generation of turbidites in deepwater areas: a case study of turbidity current processes in Qiongdongnan Basin, northern South China Sea

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Acta Oceanologica Sinica 2014年第12期33卷 127-137页

作者： JIANG Tao ZHANG Yingzhao TANG Sulin ZHANG Daojun ZUO Qianmei lin weiren WANG Yahui SUN Hui WANG Bo Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences Kochi Institute for Core Sample Research Japan Agency for Marine-Earth Science and Technology Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited

Turbidity currents represent a major agent for sediment transport in lakes, seas and oceans. In particu-lar, they formulate the most significant clastic accumulations in the deep sea, which become many of the world＇s most important hydrocarbon reservoirs. Several boreholes in the Qiongdongnan Basin, the north-western South China Sea, have recently revealed turbidity current deposits as significant hydrocarbon res-ervoirs. However, there are some arguments for the potential provenances. To solve this problem, it is es-sential to delineate their sedimentary processes as well as to evaluate their qualities as reservoir. Numerical simulations have been developed rapidly over the last several years, offering insights into turbidity current behaviors, as geologically significant turbidity currents are difficult to directly investigate due to their large scale and often destructive nature. Combined with the interpretation of the turbidity system based on high-resolution 3D seismic data, the paleotophography is acquired via a back-stripping seismic profile integrated with a borehole, i.e., Well A, in the western Qiongdongnan Basin; then a numerical model is built on the basis of this back-stripped profile. After defining the various turbidity current initial boundary conditions, includ-ing grain size, velocity and sediment concentration, the structures and behaviors of turbidity currents are investigated via numerical simulation software ANSYS FLUENT. Finally, the simulated turbidity deposits are compared with the interpreted sedimentary bodies based on 3D seismic data and the potential provenances of the revealed turbidites by Well A are discussed in details. The simulation results indicate that a sedimen-tary body develops far away from its source with an average grain size of 0.1 mm, i.e., sand-size sediment. Taking into account the location and orientation of the simulated seismic line, the consistence between normal forward simulation results and the revealed cores in

关键词： turbidity current CFD simulation 3D seismic interpretation sedimentary process

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基于岩芯非弹性应变恢复量测定的深孔三维地应力测试方法(英文)

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岩石力学与工程学报 2008年第12期27卷 2387-2394页

作者：林为人日本海洋研究开发机构高知岩芯研究所中国地质大学构造与油气资源教育部重点实验室湖北武汉430074

虽然存在各种地应力测试方法,但并没有一个比较完善的方法测量较大深度条件下主应力的大小和方向。所以,在以科学研究为目的的钻井工程中,最好能够结合钻孔法和岩芯法得到三维地应力的大小和方向。叙述一个新颖而且有效的岩芯地应力测... 详细信息

虽然存在各种地应力测试方法,但并没有一个比较完善的方法测量较大深度条件下主应力的大小和方向。所以,在以科学研究为目的的钻井工程中,最好能够结合钻孔法和岩芯法得到三维地应力的大小和方向。叙述一个新颖而且有效的岩芯地应力测试法——非弹性应变恢复量测定法的基本原理、实验技术和基本操作程序;并给出其在科学钻探工程中的一个具体应用实例。测试结果表明,非弹性应变恢复量测定法对于测试三维地应力的主方向和估测主应力的大小有较大的实用价值。特别是在某些较大深度钻井的条件下,如在应力释放法及水压致裂法都无法实施,或者需要一些其他测试方法来补充一些不足或来增添其测试结果的可信度的时候,此方法的应用价值更高。

关键词：岩石力学地应力测量非弹性应变恢复量测定岩芯法大深度科学钻探三维方法

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Porosity and permeability evolution and evaluation in anisotropic porosity multiscale-multiphase-multicomponent structure

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Chinese Science Bulletin 2012年第4期57卷 320-327页

作者： ZHU BoJing CHENG HuiHong QIAO YanChao LIU Chang SHI Yaolin ZHANG Kai SUN DongSheng lin weiren Key Laboratory of Computational Geodynamics Chinese Academy of Sciences College of Science Graduate University of Chinese Academy of Sciences Beijing 100049 China Laboratoire De Geologie Ecole Normale Sup6rieure 24 Rue Lhomond 75231 Paris CEDEX 5 France Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Geological Mechanics Institute Chinese Academy of Geological Sciences Beijing 100081 China Kochi Institute for Core Sample Research Japan Agency for Marine-Earth Science and Technology Kochi 783-8502 Japan

Based on the hybrid hypersingular integral equation-lattice Boltzmann methods (HHIE-LBM), the porosity and permeability evolution and evaluation process in anisotropic saturated porosity multiscale-multiphase-multicomponent (ASP-MS-MP-MC) structures under ultra high temperature and pressure conditions was analyzed on parallel CPU and GPU platforms. First, virtual physical models at multi-spatial scales (2 μm, 5 μm and 10 μm) were restructured by computerized microtomography technology and data. Second, using HHIE-LBM methods, the anisotropic porosity and permeability tensor at core level and pore level under ultra high temperature and pressure conditions were calculated. Third, the evolution and evaluation process of the porosity and permeability as a function of multi temporal spatial scales was investigated. Finally, the relationship between porosity and permeability and ASP-MS-MP-MC structures (micro-meso-macro-scale) was explored.

关键词：渗透率各向异性多相多组分评价过程组分结构结构演变孔隙度多尺度格子Boltzmann方法

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Three-dimensional in situ stress determination by anelastic strain recovery and its application at the Wenchuan Earthquake Fault Scientific Drilling Hole-1(WFSD-1)

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Science China Earth Sciences 2014年第3期57卷 1212-1220页

作者： SUN DongSheng lin weiren CUI JunWen WANG HongCai CHEN QunCe MA YinSheng WANG LianJie Institute of Geomechanics Chinese Academy of Geological Sciences Key Laboratory of Neotectonic Movement and Geohazard Ministry of Land and Resources Kochi Institute for Core Sample Research Japan Agency for Marine-Earth Science and Technology (JAMSTEC) State Key Laboratory for Continental Tectonics and Dynamics Institute of Geology Chinese Academy of Geological Sciences

In situ stress state becomes more and more significant with in-depth research on geodynamics and energy ***,there has not been an economic and effective method developed to determine deep three-dimensional in situ *** Anelastic Strain Recovery(ASR)method is a newly developed technique that can determine three-dimensional in situ *** the 12 May 2008 Ms8.0 Wenchuan earthquake,the ASR method was used for the first time in China's Mainland to measure the in situ stresses in the WFSD scientific boreholes in Sichuan Province,*** this paper,the basic procedure of the ASR method is introduced in detail and the compliances of ASR for boring cores are *** results show that the maximum principal stress direction was NW64°at a measured depth(MD)of 1173 m(vertical depth 1151 m)in *** ratio of shear mode to the volume mode compliance of ASR was *** the three principal stresses at 1173 m MD in WFSD-1are 43,28 and 25 *** with stress measurement results determined using other in situ measurement methods along the Longmenshan fault zone,the directions of the maximum horizontal principal stress changes from E-W to NEE-SWW to NWW-SEE when moving from NE to SW along the Longmenshan fault *** change is in agreement with the stress regime of the Longmenshan fault zone of the Wenchuan Earthquake,which supports a stress regime consisting predominantly of thrusts in the southwest and strike-slip in the northeast.

关键词： Wenchuan earthquake anelastic strain recovery compliance of anelastic strain recovery three-dimensional in situ stress scientific borehole

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稻田花岗岩单轴拉伸强度和变形各向异性特征(英文)

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岩石力学与工程学报 2008年第12期27卷 2463-2472页

作者：林为人高桥学日本海洋研究开发机构高知岩芯研究所中国地质大学构造与油气资源教育部重点实验室湖北武汉430074 日本产业技术综合研究所地圈资源与环境研究所

为查明稻田花岗岩的强度及变形之各向异性特征,从同一个较大岩块试样的3个相互垂直的方向采制圆柱形拉伸试样,对此进行单轴拉伸实验。结果表明,稻田花岗岩的抗拉强度和变形常数随拉应力的作用方向不同而发生明显变化。在与rift面相垂直... 详细信息

为查明稻田花岗岩的强度及变形之各向异性特征,从同一个较大岩块试样的3个相互垂直的方向采制圆柱形拉伸试样,对此进行单轴拉伸实验。结果表明,稻田花岗岩的抗拉强度和变形常数随拉应力的作用方向不同而发生明显变化。在与rift面相垂直的方向拉伸时,其强度和弹性模量都明显小于其他方向。而且,实验结果也表明,抗压强度的各向异性程度比其他各种物性指标的各向异性程度都要大。此外,还设计了一个新的试件安装方式,能够在拉伸过程的任何一个中间阶段非破坏地取下试件以对其进行显微观察等。用此方法,成功地取下一个超过峰值强度且未完全拉断的试件,并切取内部的切片进行显微观察。结果表明,由拉伸所形成的花岗岩中的裂纹主要穿过矿物粒子内部,并不沿着粒子边界延伸。

关键词：岩石力学单轴拉伸各向异性强度变形花岗岩裂纹显微观察

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Bottom water temperature measurements in the South China Sea,eastern Indian Ocean and western Pacific Ocean

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热带海洋学报 2018年第5期37卷 86-97页

作者： YANG Xiaoqiu SHI Xiaobin ZHAO Junfeng YU Chuanhai GAO Hongfang CHEN Aihua LU Yuanzheng CEN Xianrong lin weiren ZENG Xin XU Hehua REN Ziqiang ZHOU Shengqi XU Ziying SUN Jinlong KAMIYA Nana lin Jian CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Marine Mineral Resources Ministry of Land and Resources Guangzhou Marine Geological Survey Guangzhou 510075 China State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou 510301 China Graduate School of Engineering Kyoto University Kyoto 615-8540 Japan

文章报道了一批新的海底底水温度(BWT)数据,其中南海(SCS)158个站位、东印度洋(EIO)30个站位及西太平洋(WPO)37个站位。基于这批新的BWT数据,获得南海和西太平洋海域底水温度与水深经验关系,可为地球物理和物理海洋提供准确、可靠的海... 详细信息

文章报道了一批新的海底底水温度(BWT)数据,其中南海(SCS)158个站位、东印度洋(EIO)30个站位及西太平洋(WPO)37个站位。基于这批新的BWT数据,获得南海和西太平洋海域底水温度与水深经验关系,可为地球物理和物理海洋提供准确、可靠的海底温度边界。这将有助于海底油气资源调查与评估。同时,这批实测数据表明:1)水深超过3500m的海域,其底水温度在南海约为2.47℃,比东印度洋(～1.34℃)和西太平洋(～1.60℃)稍微偏高。这与大洋传送带模式所预测的情况比较吻合。该模式认为:低温高盐的海水,从北大西洋格陵兰岛和冰岛附近海域下沉到深层,然后向南流动,再与南极洲周围海域的低温高盐海水一同向北进入印度洋和太平洋。而南海是一个相对比较封闭的热带边缘海,其内部海水与印度洋和菲律宾海交换有限,导致海水温度整体高于印度洋和太平洋。2)台西南盆地水深在2700～3000m的部分站位,其底水温高达约3.00℃,明显高于其周边同水深海域底水温度(平均值约为2.33℃)。这可能是台西南盆地海底水热活动导致的结果。3)在东印度洋和西太平洋水深超过4800m海域,底水温度随着水压增大稍有升高,其升高率分别为10.6mK·MPa^(-1)和12.0mK·MPa^(-1)。这与理论估算的深层底水绝热压力温度梯度范围较为吻合。这也意味着东印度洋和西太平洋深层底水,主要由绝热自压作用导致其温度随着深度的增大而升高。

关键词：海底底水温度(BWT) 南海(SCS) 东印度洋(EIO) 西太平洋(WPO) 大洋传送带模式

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An Experimental Study on Measurement Methods of Bulk Density and Porosity of Rock Samples

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Journal of Geoscience and Environment Protection 2015年第5期3卷 72-79页

作者： weiren lin Osamu Tadai Manabu Takahashi Daisaku Sato Takehiro Hirose Wataru Tanikawa Yohei Hamada Kentaro Hatakeda Kochi Institute for Core Sample Research Japan Agency for Marine-Earth Science and Technology Nankoku Japan Department of Marine & Earth Sciences Marine Works Japan Ltd. Nankoku Japan Research Institute of Earthquake and Volcano Geology National Institute of Advanced Industrial Science and Technology Tsukuba Japan Graduate School of International and Area Studies Hankuk University of Foreign Studies Seoul Korea

Density and porosity are fundamental and important physical properties of rocks in various geological problems, and affect the other physical properties. Therefore, measurements of density and porosity of rock samples are important investigation items in both geo-science and geo-engineering areas. Several measurement techniques of the density and porosity are available and being applied currently. To ensure the data quality and to conduct its quality assessment, comparison of measurement results by different measurement techniques is necessary since the techniques are based on different principles and test procedures. In this study, we collected eight types of rock samples including a gabbro, a granite, four sandstones, a welded tuff and a mudstone as study materials, and also prepared several metal specimens for the experimental comparison. The porosities of the eight rocks covered a very wide range from 0.3% to 50% approximately. We employed three methods (caliper, buoyancy and helium-displacement pycnometer) to measure volumes of regularly-shaped specimens and to determine their bulk densities and porosities. As a result, the three techniques yielded almost same bulk densities and porosities for all the specimens. In addition, we also applied mercury intrusion porosimetry to measure density and porosity as well as to determine pore size distribution of the rock samples. Porosity values obtained by the porosimetry method were underestimated in the case of high-porosity (soft) rock samples and overestimated for the very low-porosity rock samples. Ability to determine pore size distribution, however, is a very important advantage of the porosimetry method.

关键词： Rock Density Porosity Caliper Method Buoyancy Method Helium-Displacement Pycnometer Mucury Intrusion Posimetry

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日本南海海槽东部首次海上天然气试采站位滞弹性应变恢复法（ASR）在原位应力分析中的应用

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海洋地质 2017年第1期33卷 29-36页

作者： Yu Nagano weiren lin Koji Yamamoto 任金锋不详广州海洋地质调查局战略所

原位应力可通过钻井岩心的滞弹性应变恢复（ASR）法来计算。在日本南海海槽东部首次海上天然气试采站位选取一口钻井，从海底之下265～313m之间不同深度取得四块岩心，在钻探船上进行滞弹性应变测量。现场ASR测量结果表明，该研究区深... 详细信息

原位应力可通过钻井岩心的滞弹性应变恢复（ASR）法来计算。在日本南海海槽东部首次海上天然气试采站位选取一口钻井，从海底之下265～313m之间不同深度取得四块岩心，在钻探船上进行滞弹性应变测量。现场ASR测量结果表明，该研究区深度范围内处于重力作用下形成的正断层应力状态。在随后的实验室实验中，通过K0固结法，使所取岩心恢复到原位应力状态，然后在卸压过程中和卸压之后进行弹性和滞弹性应力测量，进而验证现场（船上）测量结果和量化原位应力值。这些实验室校准实验验证了伴随着应力释放ASR测量结果可为人工预加压力提供合理的估计。

关键词：原位应力滞弹性应变恢复法松散岩层 K0固结法

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