拉西瓦水电站地下厂房洞室群分层开挖过程仿真反演分析

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (0 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要拉西瓦水电站厂房规模巨大，围岩主要为脆硬花岗岩，爆破后围岩分区明显；同时厂房区域山高坡陡，河谷狭窄，区域地应力场较高，且分布较复杂，对洞室稳定性不利。为了评判开挖后地下厂房围岩的稳定性及支护的长期安全性，以地下厂房分层开挖现场实测位移为基础，根据多点位移计实测的离洞壁不同深度位移的变化规律将厂房洞壁周边围岩分为松动区、过渡区和稳定区；然后采用每层开挖引起的增量实测位移与相应的反分析位移均方差作为目标函数，分层进行围岩力学参数反演分析，得到上、下游厂房不同的地应力参数及地下厂房在开挖每层时围岩的岩体力学参数。结合反演得到的这些地应力场与围岩力学参数，对后续开挖时厂房围岩稳定性进行评价与预测，提出拉西瓦地下厂房围岩稳定性判定标准。该标准为后续地下厂房监测变形控制提供依据，有效地指导厂房支护设计与开挖施工。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章

关键词 ：岩石力学, 地下洞室群, 高地应力, 围岩稳定性, 反馈分析, 拉西瓦水电站

Abstract：The excavation size of Laxiwa underground powerhouse is huge；and its surrounding rock is mainly brittle hard granite rock. Moreover，the mountains are high；the slopes are steep；and the valleys areas are narrow in the area plant. Except that，the regional stress field values are high and the high stress fields distributions are complex，which are extremely detrimental to the stability of the cavern. In order to estimate the stability of surrounding rock and supporting long-term safety of underground plant after excavation，based on back analysis model of excavation and the change laws of displacement measured by multipoint extensometers at different depths from the tunnel wall，the tunnel surrounding rock is divided into loose rock zone，transition zone and stability zone. And then，rock mass mechanical parameters were back analysed and calculated by using the measured displacement increment on each layer caused by excavation and the objective function of its mean square error. When excavating underground powerhouse each layer，the mechanical parameters and ground stress parameters near rock mass were obtained. Combination of ground stress parameters and mechanical parameters，the follow-up analysis of the stability of surrounding rock of excavation plant was evaluated and predicted. Also a standard is presented to determine the stability of surrounding rock of Laxiwa underground plant. The standard for subsequent control of underground plant monitoring deformation provides a basis for effective guidance of the plant supporting design and excavation construction.

Key words： rock mechanics underground caverns high ground stress surrounding rock stability back analysis Laxiwa hydropower station

收稿日期: 2010-05-10

引用本文:

姚显春1，李宁1，2，陈莉静1，孙宏超3，景茂贵4. 拉西瓦水电站地下厂房洞室群分层开挖过程仿真反演分析[J]. 岩石力学与工程学报, 2011, 30(S1): 3052-3059.
YAO Xianchun1，LI Ning1，2，CHEN Lijing1，SUN Hongchao3，JING Maogui4. BACK ANALYSIS OF SURROUNDING ROCK STABILITY BASED ON EXCAVATION PROCESS OF UNDERGROUND POWERHOUSE AT LAXIWA HYDROPOWER STATION. , 2011, 30(S1): 3052-3059.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/3052

[2]	景茂贵. 拉西瓦水电站地下厂房洞群监测资料反演分析与稳定性评价研究[硕士学位论文][D]. 西安：西安理工大学，2007(JING Maogui. Back analysis and stability assessment for Laxiwa underground powerhouse[M. S. Thesis][D]. Xi?an：Xi?an University of Technology，2007.(in Chinese)) " target="_blank">
[3]	SAKURAI S. Determination of initial stresses and mechanical properties of viscoelastic underground medium[C]// Proceedings of the 3rd ISRM Congress. Denver：[s. n.]，1974：1 169-1 174. " target="_blank">
[5]	孙钧. 岩土力学与地下工程结构分析计算的若干进展[J]. 力学季刊，2005，26(3)：329-338.(SUN Jun. Recent development on the computation techniques of geomechanics and underground structures[J]. Chinese Quarterly of Mechanics，2005，26(3)：329-338.(in Chinese)) " target="_blank">
[8]	杨林德，冯紫良，朱合华，等. 岩土工程问题的反演理论与工程实践[M]. 北京：科学出版社，1996：1-8.(YANG Linde，FENG Ziliang，ZHU Hehua，et al. Back analysis theory and practice in geotechnical engineering[M]. Beijing：Science Press，1996：1-8.(in Chinese)) " target="_blank">
[9]	江权，冯夏庭，陈建林，等. 锦屏二级水电站厂址区域三维地应力场非线性反演[J]. 岩土力学，2008，29(11)：3 003-3 010.(JIANG Quan，FENG Xiating，CHEN Jianlin，et al. Nonlinear inversion of 3D initial geostress field in Jinping II Hydropower Station region[J]. Rock and Soil Mechanics，2008，29(11)：3 003-3 010.(in Chinese)) " target="_blank">
[13]	ZIENKIEWICZ O C，CORMEAU I C. Visco-Plasticity-plasticity and creep in elastic solids—a unified numerical solution approach[J]. International Journal for Numerical Methods in Engineering，1974，8(4)：821-845. " target="_blank">
[14]	陈方方. 地下洞室弹塑性仿真反分析研究[硕士学位论文][D].西安：西安理工大学，2004.(CHEN Fangfang. A method of elastoplastic back analysis by emulating construction of tunne[M. S. Thesis][D]. Xi?an：Xi?an University of Technology，2004.(in Chinese)) " target="_blank">
[15]	丁秀丽，董志宏，卢波，等. 陡倾角沉积岩地层中大型地下厂房开挖围岩变形失稳特征和反馈分析[J]. 岩石力学与工程学报，2008，27(10)：2 019-2 026.(DING Xiuli，DONG Zhihong，LU Bo，et al. Deformation characteristics and feedback analysis of surrounding rock of large underground powerhouse excavated in steeply dipped sedimentary rock strata[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(10)：2 019-2 026.(in Chinese)) " target="_blank">
[16]	付成华，汪卫明，陈胜宏. 溪洛渡水电站坝区初始地应力场反演分析研究[J]. 岩石力学与工程学报，2006，25(11)：2 305-2 312.(FU Chenghua，WANG Weiming，CHEN Shenghong. Back analysis study on initial geostress field of dam site for Xiluodu hydropower project[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(11)：2 305-2 312.(in Chinese)) " target="_blank">
[1]	姚显春，李宁，曲星，等. 拉西瓦水电站地下厂房三维高地应力反演分析研究[J]. 岩土力学，2010，31(1)：246-252.(YAO Xianchun，LI Ning，QU Xing，et al. Back analysis of three- dimensional initial geostress Laxiwa underground powerhouse[J]. Rock and Soil Mechanics and Engineering，2010，31(1)：246-252.(in Chinese)) " target="_blank">
[6]	WANG Z Y，LIU H H. Back analysis of measured rheologic displacements of underground openings[C]// Proceedings of the 6th Conference on Numerical Method in Geomechanics. [S. l.]：[s. n.]，1988：2 291-2 297. " target="_blank">
[10]	朱维申，朱家桥，代冠一，等. 考虑时空效应的地下洞室变形观测及反分析[J]. 岩石力学与工程学报，1989，4(8)：346-353.(ZHU Weishen，ZHU Jiaqiao，DAI Guanyi，et al. Some practical cases of back analysis of underground openings deformability concerning effects of time ang space[J]. Chinese Journal of Rock Mechanics and Engineering，1989，4(8)：346-353.(in Chinese)) " target="_blank">
[7]	李仲奎，王爱民，莫兴华，等. 大型地下洞群时空双系列反馈分析[J]. 清华大学学报：自然科学版，1998，38(1)：50-54.(LI Zhongkui，WANG Aimin，MO Xinghua，et al. Time/space double series back analysis of large-scale underground powerhouse[J]. Journal of Tsinghua University：Science and Technology，1998，38(1)：50-54.(in Chinese)) " target="_blank">
[11]	李宁，辛有良，韩烜，等. 华盛顿地铁福特——图特站的仿真反分析[J]. 西安理工大学学报，1996，12(4)：324-329.(LI Ning，XIN Youliang，HAN Xuan，et al. The simulation back analysis of Washington subway?s fort-totten station[J]. Journal of Xi?an University of Technology，1996，12(4)：324-329.(in Chinese)) " target="_blank">
[12]	冯夏庭，张治强，杨成祥，等. 位移反分析的进化神经网络方法研究[J]. 岩石力学与工程学报，1999，18(5)：529-533.(FENG Xiating，ZHANG Zhiqiang，YANG Chengxiang，et al. Study on genetic neural network method of displacement back analysis[J]. Chinese Journal of Rock Mechanics and Engineering，1999，18(5)：529-533.(in Chinese))
[4]	徐卫亚，谢守益，蒋晗，等. 清江水布垭水电站地下厂房岩体质量评价及反馈设计研究[J]. 工程地质学报，2000，8(2)：191-196. (XU Weiya，XIE Shouyi，JIANG Han，et al. Quality assessment of rock mass and feedback design for underground buildings of Shuibuya Hydropower Plant[J]. Journal of Engineering Geology，2000，8(2)：191-196.(in Chinese))