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隧道建设 2014年第S1期 145-152页

作者：贺晓钢徐奴文戴峰朱永国肖培伟李彪四川大学水力学与山区河流开发保护国家重点实验室四川成都610065 国电大渡河猴子岩水电建设有限公司四川康定626005

猴子岩水电站地下厂房位置地处深山峡谷区，区域地质构造背景较为复杂，并且具有地应力值相对较高，洞室跨度大、边墙高，洞室埋深大等特点。地应力最大值有36 MPa，最大垂直埋深可达660 m。因此，在开挖过程中，岩体卸荷对洞室围岩的... 详细信息

猴子岩水电站地下厂房位置地处深山峡谷区，区域地质构造背景较为复杂，并且具有地应力值相对较高，洞室跨度大、边墙高，洞室埋深大等特点。地应力最大值有36 MPa，最大垂直埋深可达660 m。因此，在开挖过程中，岩体卸荷对洞室围岩的稳定性影响较大。选择典型剖面，运用快速拉格朗日差分法（FLAC3 D）对地下洞室的分层开挖支护过程进行了数值模拟，对模拟结果进行分析，包括围岩变形场、应力场和塑性区的分布规律，并将模拟结果与现场内观监测资料和微震监测资料进行对比分析。分析表明，围岩变形与内观监测结果较为吻合，同时在围岩应力发生集中的部位，微震事件发生区域性聚集。因此，可以通过数值模拟来预测后续开挖中的围岩变形，为开挖支护施工提供指导。

关键词：地下厂房开挖支护围岩稳定数值模拟现场监测

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基于三维数值模拟和微震监测的水工岩质边坡稳定性分析

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岩石力学与工程学报 2013年第7期32卷 1373-1381页

作者：徐奴文唐春安周钟沙椿梁正召四川大学水力学与山区河流开发保护国家重点实验室四川成都610065 大连理工大学岩石破裂与失稳研究所辽宁大连116024 中国水电工程顾问集团成都勘测设计研究院四川成都610072

建立以微震监测为主、应力场分析为辅的水工岩质边坡稳定性分析方法。利用RFPA3D分析软件,研究三维条件下锦屏一级水电站左岸岩质边坡破坏过程微破裂的萌生、演化、扩展、相互作用和贯通机制,揭示边坡整体失稳破坏模式,探讨岩质边坡渐... 详细信息

建立以微震监测为主、应力场分析为辅的水工岩质边坡稳定性分析方法。利用RFPA3D分析软件,研究三维条件下锦屏一级水电站左岸岩质边坡破坏过程微破裂的萌生、演化、扩展、相互作用和贯通机制,揭示边坡整体失稳破坏模式,探讨岩质边坡渐进失稳破坏过程应力场和微震活动性空间演化基本规律,形成从细观损伤演化过程揭示宏观岩体结构破坏的研究方法。研究结果表明:断层F5,F2和煌斑岩脉X等软弱结构面是控制左岸边坡破坏模式的关键因素之一,RFPA3D离心加载法得到的边坡潜在滑移面及声发射与微震监测系统得到的岩石微破裂空间宏观演化趋势比较一致。

关键词：边坡工程锦屏一级水电站岩质边坡稳定性数值模拟微震监测

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基于微震监测与数值模拟的大岗山右岸边坡抗剪洞加固效果分析

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岩石力学与工程学报 2013年第6期32卷 1239-1247页

作者：马克唐春安李连崇李宏徐奴文肖平杨菊英大连理工大学岩石破裂与失稳研究中心辽宁大连116024 四川大学水利水电学院四川成都610065 国电大渡河大岗山水电开发有限公司四川雅安625409 大连力软科技有限公司辽宁大连116600

大岗山水电站坝址区右岸边坡高、陡,地应力较高,发育有辉绿岩脉、卸荷裂隙密集带及中倾坡外的断层等不利组合体,使边坡岩体的性状急剧下降,在边坡开挖过程中曾出现若干条宏观裂缝,对施工期边坡稳定性构成极大威胁。将实际微震监测技术... 详细信息

大岗山水电站坝址区右岸边坡高、陡,地应力较高,发育有辉绿岩脉、卸荷裂隙密集带及中倾坡外的断层等不利组合体,使边坡岩体的性状急剧下降,在边坡开挖过程中曾出现若干条宏观裂缝,对施工期边坡稳定性构成极大威胁。将实际微震监测技术与符合岩石类准脆性材料本构关系的RFPA3D数值模拟相结合,对抗剪洞加固前、后的边坡稳定性进行分析。指出边坡开挖过程中岩体空间损伤劣化的微震活动规律和可能发生坡体失稳的潜在滑动面位置。研究结果证实抗剪洞加固措施的合理性,发现经抗剪洞回填混凝土置换处理后的结构体抗剪阻滑力大幅增加,加固后单月发生的微震事件数减少66.4%,边坡安全系数也较加固前增大了51.2%。但由于复杂的坡体结构,使得在边坡开挖过程中仍然存在局部失稳的可能,建议应随着施工作业对剪出口进行锁固,并在后期大坝浇筑过程中对抗剪洞未贯通区域的岩体微破裂情况和卸荷裂隙带XL–316与f231断层交界处的岩体变形情况进行重点监测。

关键词：岩石力学右岸边坡微震监测数值模拟抗剪洞

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Numerical analysis of failure mechanism of tunnel under different confining pressure

Numerical analysis of failure mechanism of tunnel under diff...

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1st International Symposium on Mine Safety Science and Engineering (ISMSSE)

作者： Hu, Jun xu, nuwen Univ Sci & Technol Liaoning Sch Resources & Civil Engn Anshan 114051 Liaoning Peoples R China Dalian Univ Technol Fac Infrastruct Engn Dalian 116024 Peoples R China

More and more deep-buried underground excavations have been carried out in some large-scale hydroelectric stations at southwest of China. When underground development continues at great depths, the danger of surrounding rock instability will inevitably increase in underground powerhouses and tunnels. To in-depth analysis the failure mechanism and quantify deformation of the structures is one of the hottest problems to be probed in rock mechanics and rock engineering field. The objective of this study is to investigate the effect of different confining pressures on the failure phenomena of tunnels. A realistic failure progressive analysis code named RFPA was adopted to display the full failure processes of tunnel under different confining pressures. RFPA code has the capability of simulating the whole fracturing process of initiation, propagation and coalescence of fractures around excavations. The numerical model presented here can be used not only to display fracturing patterns of tunnels, but also to predict fracturing patterns under different confining pressures. The simulated results demonstrate that confining pressures play a great role in the failure mode of tunnels. With the increase of lateral pressure, the initiation, migration and expansion of cracks can be delineated. Based on these fracturing patters, failure mechanisms are identified and reasonable support can be thus performed later on. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of China Academy of Safety Science and Technology, China University of Mining and Technology( Beijing), McGill University and University of Wollongong

关键词： confining pressure numerical simulation tunnel failure mechanism

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Numerical analysis of faults on deep-buried tunnel surrounding rock damaged zones

Numerical analysis of faults on deep-buried tunnel surroundi...

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International Conference on Civil Engineering and Transportation (ICCET 2011)

作者： Hu, Jun xu, Ling xu, nuwen Univ Sci & Technol Liaoning Sch Resources & Civil Engn Anshan 114051 Liaoning Peoples R China Dalian Univ Technol Inst Rock Instabil & Seismicity Res Dalian 116024 Peoples R China

ISBN: (纸本)9783037852422

Fault is one of the most important factors affecting tunnel instability. As a significant and casual construction of Jinping II hydropower station, when the drain tunnel is excavated at depth of 1600 m, rockbursts and water inrush induced by several huge faults and zone of fracture have restricted the development of the whole construction. In this paper, a progressive failure progress numerical analysis code-RFPA (abbreviated from Rock Failure Process Analysis) is applied to investigate the influence of faults on tunnel instability and damaged zones. Numerical simulation is performed to analyze the stress distribution and wreck regions of the tunnel, and the results are consistent with the phenomena obtained from field observation. Moreover, the effects of fault characteristics and positions on the construction mechanical response are studied in details. Some distribution rules of surrounding rock stress of deep-buried tunnel are summarized to provide the reasonable references to TBM excavation and post-support of the drain tunnel, as well as the design and construction of similar engineering in future.

关键词： fault deep-buried tunnel numerical simulation surrounding rock-mass RFPA

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Numerical simulation on failure mechanism of rock slope using RFPA

Numerical simulation on failure mechanism of rock slope usin...

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International Conference on Intelligent Structure and Vibration Control (ISVC 2011)

作者： xu, nuwen Tang, Chunan Sha, Chun Zhang, Rulin Dalian Univ Technol Inst Rock Instabil & Seism Res Dalian 116024 Liaoning Peoples R China State Power Corp China Chengdu Hydroelect Invest & Design Inst Chengdu 610072 Peoples R China Tongji Univ State Key Lab Disaster Reduct Civil Engn Shanghai 200092 Peoples R China

ISBN: (纸本)9783037850206

This research applied a numerical code, RFPA(2D) (Realistic Failure Process Analysis) to evaluate the stability and investigate the failure mode of the high rock slope during excavations based on Strength Reduction Method (SRM). The corresponding shapes and positions of the potential slip surfaces are rationally simulated in different stages, and the related safety coefficients are obtained, which agrees well with the allowable minimum safety factors of the slope. The numerical results show that the safety coefficient drops from 1.25 at the natural state to 1.09 after excavation, and then increases to 1.35 after slope reinforcement. Moreover, the potential slip surface of the left bank moves into deep rock mass after taking support measures, which demonstrates the reinforcement is reasonable and efficient. The study shows that cracks and faults will cause crucial influences on the slope stability, and RFPA(2D) is a good tool to directly display the potential slip surface of the slope, which will offer valuable guidance for bolt support.

关键词： strength reduction method rock slope stability analysis safety factor RFPA

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Numerical analysis of failure mechanism of tunnel under different confining pressure

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Procedia Engineering 2011年 26卷 107-112页

作者： Jun Hu nuwen xu School of Resources and Civil Engineering University of Science and Technology Liaoning Anshan Liaoning 114051 China Faculty of Infrastructure Engineering Dalian University of Technology Dalian Liaoning 116024 China

关键词： confining pressure numerical simulation tunnel failure mechanism

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Optimal Design of Microseismic Monitoring Networking and Error Analysis of Seismic Source Location for Rock Slope

Optimal Design of Microseismic Monitoring Networking and Err...

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International Conference on Structures and Building Materials

作者： xu, nuwen Tang, Chunan Wu, Sihao Li, Guilin Yang, Juying Dalian Univ Technol Inst Rock Instabil & Seism Res Dalian 116024 Liaoning Peoples R China Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian 116024 Liaoning Peoples R China China Guodian Dagangshan Hydropower Dev Co Ltd Yaan 625409 Sichuan Peoples R China Dalian Mechsoft Co Ltd Dalian 116600 Liaoning Peoples R China

ISBN: (纸本)9780878492060

For the purpose of getting a better understanding of failure mechanisms of rock fracturing due to construction perturbation inside the right rock slope of Dagangshan Hydropower Staion, a high precision microseimic monitoring system was installed and preliminary source location data have been investigated. The optimal design of microseimic monitoring network, especially the sensor array was investigated based on P method and Powell algorithm. The positioning accuracy of the system has been adjusted according to artificial fixed blasting tests. The testing results show that microseismic source location error is less than 10 m in the scope of the sensor array, which demonstrates the monitoring system deployed at the right slope has a high positioning accuracy. Signals from 112 microseismic events with moment magnitude ranging from -1.8 to -0.4 were recorded during its 2-month monitoring period. The cluster distribution of microseismic events can reflect directly the construction progresses such as the concentration of microseismicity inside the drainage tunnel at 1081 m level. The present study have significantly improved the understanding of the characteristics of the failure associated with excavation inside the rock slope, and will greatly benefit the potential sliding areas prediction and support of hazards in the phase of construction in future.

关键词： Microseismic Monitoring. Optimal Design Source Location Error Rock Slope

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Optimal design of micro-seismic monitoring array and seismic source location estimation for rock slope

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Open Civil Engineering Journal 2011年第1期5卷 36-45页

作者： xu, nuwen Tang, Chun-an Li, Hong Wu, Sihao Institute of Rock Instability and Seismicity Research Dalian University of Technology Dalian Liaoning 116024 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian Liaoning 116024 China China Guodian Dagangshan Hydropower Development Co. Ltd Sichuan Yaan 625409 China

For the purpose of getting a better understanding on failure mechanism of rock fracturing due to construction perturbation inside the rock slope at the right bank of Dagangshan Hydropower Station, southwest of China, a highprecision microseismic monitoring system was installed and source location data has preliminarily been investigated. The optimal design of microseismic monitoring network, especially the sensor array was investigate based on P method and Powell algorithm. The positioning accuracy of the system has been adjusted according to the artificial fixed blasting tests. The testing results show that the error in localizing microseismic source is less than 10 m within the scope of the sensor array, indicating that the positioning accuracy for the monitoring system deployed at the right bank slope is high. Signals from 255 microseismic events with moment magnitude ranging from -1.8 to -0.4 were recorded during the 2-month monitoring period. The cluster distribution of microseismic events such as the concentration of microseismicity inside the drainage tunnel at 1081 m level can directly reflect the construction progress. The present study has significantly improved the understanding of the characteristics of the failure associated with excavation inside the rock slope. It will greatly benefit the prediction on potential sliding areas and support to prevent hazards during construction phases. © xu et al.

关键词： Microseismic monitoring

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基于强度折减法的大岗山水电站边坡稳定性分析

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人民长江 2011年第24期42卷 65-68页

作者：高键徐涛徐奴文大连大学材料破坏力学数值试验研究中心辽宁大连116622 大连理工大学土木水利学院辽宁大连116024

基于ANSYS强度折减法,以大岗山水电站右岸边坡为例,研究了弱层对边坡稳定性的影响、边坡的失稳破坏机理以及二维和三维分析计算结果的区别和联系。结果表明:弱层对边坡的稳定性有显著的控制作用;工程现场加固措施对提高边坡稳定性的作... 详细信息

基于ANSYS强度折减法,以大岗山水电站右岸边坡为例,研究了弱层对边坡稳定性的影响、边坡的失稳破坏机理以及二维和三维分析计算结果的区别和联系。结果表明:弱层对边坡的稳定性有显著的控制作用;工程现场加固措施对提高边坡稳定性的作用明显;边坡的失稳破坏是一个塑性区累积发展、位移逐步增大的过程;三维计算所得的安全系数、位移及应变值与二维计算结果存在一定的差异,主要是由于模型、单元、网格划分及单元应力状态等方面的差异造成的,相对而言,三维计算结果更加可靠。

关键词：强度折减法边坡稳定性大岗山水电站

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