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
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摘要
介绍彭水水电站地下主厂房洞室施工过程中高边墙围岩的变形破坏特征、相应的加固处理措施以及围岩监测成果等;在此基础上,开展主厂房围岩施工期的动态反馈分析。研究结果表明:对于陡倾角层状岩体中开挖的大型地下洞室群,围岩中分布的软弱结构面和岩层层面对上、下游边墙的变形与稳定起着控制性作用,陡倾角、顺向岩层组合的高边墙其变形失稳模式以典型的滑移破坏为主;而陡倾角、逆向岩层组合的高边墙则以沿层面的张裂、折断、倾倒变形后的坍塌破坏为主。通过开展施工期围岩监测反馈分析,为彭水水电站地下厂房的动态设计和信息化施工提供了重要依据。
The deformation and failure characteristics of the surrounding rock of the high side wall of underground powerhouses of Pengshui Hydropower Station,corresponding supporting and processing scheme and the monitoring results,are described.Then dynamic feedback analysis is performed and the result is given.The result shows that the stability of high side wall is very critical when excavating large underground caverns in steeply dipped sedimentary rock strata;the deformation and stability of the surrounding rock is primarily dominated by weak structure plane and bedding plane.For the high side wall with steep dip angle and consequent rock strata,the deformation and failure mode of surrounding rock are typical sliding along the bedding plane;and for the high side wall with steep dip angle and obsequent rock strata,the deformation and collapse are caused by tension crack,break off and toppling.The results of feedback analysis based on the deformation monitoring data can provide important references to dynamic support design and information construction of the underground powerhouses.
The deformation and failure characteristics of the surrounding rock of the high side wall of underground powerhouses of Pengshui Hydropower Station,corresponding supporting and processing scheme and the monitoring results,are described.Then dynamic feedback analysis is performed and the result is given.The result shows that the stability of high side wall is very critical when excavating large underground caverns in steeply dipped sedimentary rock strata;the deformation and stability of the surrounding rock is primarily dominated by weak structure plane and bedding plane.For the high side wall with steep dip angle and consequent rock strata,the deformation and failure mode of surrounding rock are typical sliding along the bedding plane;and for the high side wall with steep dip angle and obsequent rock strata,the deformation and collapse are caused by tension crack,break off and toppling.The results of feedback analysis based on the deformation monitoring data can provide important references to dynamic support design and information construction of the underground powerhouses.
引文
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[2]付敬,丁秀丽,张练.岩溶回填改善地下洞室群围岩稳定性的数值分析[J].长江科学院院报,2006,23(4):47–50.(FU Jing,DING Xiuli,ZHANG Lian.Numerical analysis of improvement of stability of the underground powerhouse surrounding rock with filling in karst regions[J].Journal of Yangtze River Scientific Research Institute,2006,23(4):47–50.(in Chinese))
[3]宁华晚,宋静.索风营水电站地下厂房设计优化及技术特点[J].水利水电技术,2005,36(9):21–23.(NING Huawan,SONG Jing.Design optimization and technical features of underground powerhouse for Suofengying Hydropower Station[J].Water Resources and Hydropower Engineering,2005,36(9):21–23.(in Chinese))
[4]丁秀丽,盛谦,邬爱清,等.水布垭地下厂房施工开挖与加固的数值模拟[J].岩石力学与工程学报,2002,21(增):2 162–2 167.(DING Xiuli,SHENG Qian,WU Aiqing,et al.Numerical modeling on the excavation and reinforcement for the underground powerhouse in the Shuibuya Project[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(Supp.):2 162–2 167.(in Chinese))
[5]肖明,王阳雪.陡倾角层状岩体中地下厂房洞室围岩稳定性分析[J].岩石力学与工程学报,2002,21(增):2 057–2 060.(XIAO Ming,WANG Yangxue.Stability analysis of underground houses in the rock masses with steep obliquity[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(Supp.):2 057–2 060.(in Chinese))
[6]李术才,王刚,王书刚,等.加锚断续节理岩体断裂损伤模型在硐室开挖与支护中的应用[J].岩石力学与工程学报,2006,25(8):1 582–1 590.(LI Shucai,WANG Gang,WANG Shugang,et al.Application of fracture-damage model to anchorage of discontinuous jointed rock mass of excavation and supporting[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(8):1 582–1 590.(in Chinese))
[7]王克忠,张文雷,蔡美峰,等.地下电站厂房层状围岩位移的动态效应研究[J].水力发电学报,2005,24(4):99–103.(WANG Kezhong,ZHANG Wenlei,CAI Meifeng,et al.Research on dynamic displacement of layer composite rock mass[J].Journal of Hydroelectric Engineering,2005,24(4):99–103.(in Chinese))
[8]张风,周述达,郭伟.彭水地下电站厂房洞室布置及支护设计[J].人民长江,2006,37(1):35–37.(ZHANG Feng,ZHOU Shuda,GUO Wei.Chamber arrangement and support design of the underground powerhouse in Pengshui Hydropower Station[J].Yangtze River,2006,37(1):35–37.(in Chinese))
[9]付敬,丁秀丽.彭水水电站地下厂房围岩稳定性研究[R].武汉:长江科学院,2003.(FU Jing,DING Xiuli.Study on stability of the surrounding rock of the underground powerhouse in Pengshui Hydropower Station[R].Wuhan:Yangtze River Scientific Research Institute,2003.(in Chinese))
[10]朱焕春.彭水水电站地下厂房洞室群围岩稳定性数值模拟与岩石力学分析[R].武汉:Itasca(武汉)咨询有限公司,2003.(ZHU Huanchun.Analysis of rock mechanics and numerical simulation on stability of the surrounding rock of the underground powerhouse in Pengshui Hydropower Station[R].Wuhan:Itasca Consulting Wuhan Inc.,2003.(in Chinese))
[11]丁秀丽,张练,张风.彭水水电站地下厂房围岩稳定性及支护措施[J].人民长江,2006,37(1):77–80.(DING Xiuli,ZHANG Lian,ZHANG Feng.Study on stability and support measures of the surrounding rock of the underground powerhouse in Pengshui Hydropower Station[J].Yangtze River,2006,37(1):77–80.(in Chinese))
[12]王芝银,李云鹏.地下工程位移反分析法及程序[M].西安:陕西科学技术出版社,1993.(WANG Zhiyin,LI Yunpeng.Program and back analysis method in underground engineering[M].Xi′an:Shaanxi Science and Technology Press,1993.(in Chinese))
[13]杨志法,王思敬,冯紫良,等.岩土工程反分析原理及应用[M].北京:地震出版社,2002.(YANG Zhifa,WANG Sijing,FENG Ziliang,et a1.Principles of back analysis of geotechnical engineering and its application[M].Beijing:Earthquake Press,2002.(in Chinese))
[14]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.(YANG Linde,FENG Ziliang,ZHU Hehua,et al.Back analysis theory and practice in geotechnical engineering[M].Beijing:Science Press,1996.(in Chinese))
[15]董志宏,丁秀丽,张风,等.大型地下厂房施工期围岩变形监测成果分析[J].岩土力学,2006,27(增2):637–642.(DONG Zhihong,DING Xiuli,ZHANG Feng,et al.Analysis of deformation monitoring of large-scale underground powerhouse during construction period[J].Rock and Soil Mechanics,2006,27(Supp.2):637–642.(in Chinese))
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