一种洞室围岩强度参数的反演方法及其验证
|
摘要
详细分析反演强度参数的惟一性,提出其存在3个层面的多值性问题:(1)实测位移同时与弹性参数及强度参数有关;(2)塑性软化时的应力–应变关系存在多值性;(3)强度参数c,?的不同组合会使围岩某单元发生相同的塑性变形。针对这3个问题,通过假定围岩是理想弹塑性介质,利用现场实测手段将围岩位移进行弹、塑性分离,并在优化方法中考虑强度参数的内在作用机制,而且提出"塑性变形非协调性"的概念;从而探索解决强度参数反演惟一性的新途径,并利用"理想量测位移"检验新方法的可行性。最后采用数值试验方法开展强度参数反演可靠性研究,结果表明所提反演分析方法的精度与稳定性均较好,且不存在初值敏感性问题。
The uniqueness of strength parameters is discussed in detail,and three aspects of this multi-value problem are discussed as following:(1) the in-situ displacement results are simultaneously concerned with elastic and strength parameters;(2) the stress-strain relationship shows multi-value under plastic softening condition;and (3) strength parameters are mutually independent,and their different combinations can make certain element of the rock with the same plastic deformation. Aiming at these problems,the new approach is presented to solve the uniqueness of strength parameters in back-analysis by assuming that the rock is an ideal elastoplastic medium;and field measurement procedures to separate elastic and plastic displacement,and the inner action mechanism in optimization method are all considered,whereas the concept of non-conformity of plastic deformation is proposed. Moreover,the feasibility of this new method is verified. Finally,the research on reliability of strength parameters in the back-analysis is developed by numerical experiments. The results show that the accuracy and stability are all favorable,and the problem of initial value sensitivity is also solved.
The uniqueness of strength parameters is discussed in detail,and three aspects of this multi-value problem are discussed as following:(1) the in-situ displacement results are simultaneously concerned with elastic and strength parameters;(2) the stress-strain relationship shows multi-value under plastic softening condition;and (3) strength parameters are mutually independent,and their different combinations can make certain element of the rock with the same plastic deformation. Aiming at these problems,the new approach is presented to solve the uniqueness of strength parameters in back-analysis by assuming that the rock is an ideal elastoplastic medium;and field measurement procedures to separate elastic and plastic displacement,and the inner action mechanism in optimization method are all considered,whereas the concept of non-conformity of plastic deformation is proposed. Moreover,the feasibility of this new method is verified. Finally,the research on reliability of strength parameters in the back-analysis is developed by numerical experiments. The results show that the accuracy and stability are all favorable,and the problem of initial value sensitivity is also solved.
引文
[1]KIRSTEN H A D.Determination of rock mass elastic moduli by back analysis of deformation measurement[C]//Proceedings of Symposium on Exploration for Rock Engineering.Johannesburg,South Africa:[s.n.],1976:1154–1160.
[2]MAIAR G,JURINA,PODOLAK K.On model identification problems in rock mechanics[C]//Proceedings of Symposium on the Geotechnics of Structurally Complex Formations.Capri:[s.n.],1977:257–261.
[3]KOVARI K,AMSTAD C H,FRITZ P.Integrated measuring technique for rock pressure determination[C]//Proceedings of International Conference on Field Measurements in Rock Mechanics.Zurich:[s.n.],1977:533–538.
[4]GIODA G.Indirect identification of the average elastic characteristics of rock masses[C]//Proceedings of International Conference on Structural Foundation on Rock.Sydney:[s.n.],1980:65–73.
[5]孙钧,黄伟.岩石力学参数弹塑性反演问题的优化方法[J].岩石力学与工程学报,1992,11(3):221–229.(SUN Jun,HUANG Wei.Optimization method for elastoplastic parameter back analysis in rock mechanics[J].Chinese Journal of Rock Mechanics and Engineering,1992,11(3):221–229.(in Chinese))
[6]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 al.Principle of back analysis and its application to geotechnical engineering[M].Beijing:Earthquake Press,2002.(in Chinese))
[7]冯紫良,杨志法.关于弹塑性位移反分析的若干研究[C]//中国科学院地质研究所工程地质力学开放研究实验室1989年报.北京:地震出版社,1990:87–102.(FENG Ziliang,YANG Zhifa.Some problems in elastoplastic back analysis[C]//Annual Report(1989)of Laboratory of Geotechnical Engineering,Institute of Geology,Chinese Academy of Sciences.Beijing:Earthquake Press,1990:87–102.(in Chinese))
[8]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))
[9]倪绍虎,肖明.基于围岩松动圈的地下工程参数场位移反分析[J].岩石力学与工程学报,2009,28(7):1439–1446.(NI Shaohu,XIAO Ming.Displacement back analysis of parameter field in underground engineering based on excavation damaged zone of surrounding rock[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1439–1446.(in Chinese))
[10]李宁,段小强,陈方方,等.围岩松动圈的弹塑性位移反分析方法探索[J].岩石力学与工程学报,2006,25(7):1304–1308.(LI Ning,DUAN Xiaoqiang,CHEN Fangfang,et al.A back analysis method for elastoplastic displacement of broken rock zone around tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(7):1304–1308.(in Chinese))
[11]陈方方,李宁,张志强.地下洞室围岩弹塑性仿真反演分析方法[J].西安科技大学学报,2007,27(2):228–231.(CHEN Fangfang,LI Ning,ZHANG Zhiqiang.Method of elastoplastic back analysis by emulating construction of tunnel[J].Journal of Xi′an University of Science and Technology,2007,27(2):228–231.(in Chinese))
[12]李宁,尹森菁.边坡安全监测的仿真反分析[J].岩石力学与工程学报,1996,15(1):9–18.(LI Ning,YIN Senqing.Back analysis of factor of safety for slope[J].Chinese Journal of Rock Mechanics and Engineering,1996,15(1):9–18.(in Chinese))
[13]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.Simulation back analysis of Washington subway′s Fort station[J].Journal of Xi'an University of Technology,1996,12(4):324–329.(in Chinese))
[14]李宁,李永刚,张平.碎裂块体围岩安全监测与仿真反分析[J].岩土工程学报,2000,22(2):170–173.(LI Ning,LI Yonggang,ZHANG Ping.A simulating inversion method for an opening in discrete rock masses[J].Chinese Journal of Geotechnical Engineering,2000,22(2):170–173.(in Chinese))
[15]刘学增.岩土介质横观各向同性黏弹性优化反分析理论与应用研究[博士学位论文][D].上海:同济大学,2001.(LIU Xuezeng.Back analysis of transversely isotropic viscoelasticity of rock and soil medium and its application[Ph.D.Thesis][D].Shanghai:Tongji University,2001.(in Chinese))
[16]吕爱钟,蒋斌松.岩石力学反问题[M].北京:煤炭工业出版社,1998.(LU Aizhong,JIANG Binsong.Back analysis of rock mechanics[M].Beijing:China Coal Industry Publishing House,1998.(in Chinese))
[2]MAIAR G,JURINA,PODOLAK K.On model identification problems in rock mechanics[C]//Proceedings of Symposium on the Geotechnics of Structurally Complex Formations.Capri:[s.n.],1977:257–261.
[3]KOVARI K,AMSTAD C H,FRITZ P.Integrated measuring technique for rock pressure determination[C]//Proceedings of International Conference on Field Measurements in Rock Mechanics.Zurich:[s.n.],1977:533–538.
[4]GIODA G.Indirect identification of the average elastic characteristics of rock masses[C]//Proceedings of International Conference on Structural Foundation on Rock.Sydney:[s.n.],1980:65–73.
[5]孙钧,黄伟.岩石力学参数弹塑性反演问题的优化方法[J].岩石力学与工程学报,1992,11(3):221–229.(SUN Jun,HUANG Wei.Optimization method for elastoplastic parameter back analysis in rock mechanics[J].Chinese Journal of Rock Mechanics and Engineering,1992,11(3):221–229.(in Chinese))
[6]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 al.Principle of back analysis and its application to geotechnical engineering[M].Beijing:Earthquake Press,2002.(in Chinese))
[7]冯紫良,杨志法.关于弹塑性位移反分析的若干研究[C]//中国科学院地质研究所工程地质力学开放研究实验室1989年报.北京:地震出版社,1990:87–102.(FENG Ziliang,YANG Zhifa.Some problems in elastoplastic back analysis[C]//Annual Report(1989)of Laboratory of Geotechnical Engineering,Institute of Geology,Chinese Academy of Sciences.Beijing:Earthquake Press,1990:87–102.(in Chinese))
[8]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))
[9]倪绍虎,肖明.基于围岩松动圈的地下工程参数场位移反分析[J].岩石力学与工程学报,2009,28(7):1439–1446.(NI Shaohu,XIAO Ming.Displacement back analysis of parameter field in underground engineering based on excavation damaged zone of surrounding rock[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1439–1446.(in Chinese))
[10]李宁,段小强,陈方方,等.围岩松动圈的弹塑性位移反分析方法探索[J].岩石力学与工程学报,2006,25(7):1304–1308.(LI Ning,DUAN Xiaoqiang,CHEN Fangfang,et al.A back analysis method for elastoplastic displacement of broken rock zone around tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(7):1304–1308.(in Chinese))
[11]陈方方,李宁,张志强.地下洞室围岩弹塑性仿真反演分析方法[J].西安科技大学学报,2007,27(2):228–231.(CHEN Fangfang,LI Ning,ZHANG Zhiqiang.Method of elastoplastic back analysis by emulating construction of tunnel[J].Journal of Xi′an University of Science and Technology,2007,27(2):228–231.(in Chinese))
[12]李宁,尹森菁.边坡安全监测的仿真反分析[J].岩石力学与工程学报,1996,15(1):9–18.(LI Ning,YIN Senqing.Back analysis of factor of safety for slope[J].Chinese Journal of Rock Mechanics and Engineering,1996,15(1):9–18.(in Chinese))
[13]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.Simulation back analysis of Washington subway′s Fort station[J].Journal of Xi'an University of Technology,1996,12(4):324–329.(in Chinese))
[14]李宁,李永刚,张平.碎裂块体围岩安全监测与仿真反分析[J].岩土工程学报,2000,22(2):170–173.(LI Ning,LI Yonggang,ZHANG Ping.A simulating inversion method for an opening in discrete rock masses[J].Chinese Journal of Geotechnical Engineering,2000,22(2):170–173.(in Chinese))
[15]刘学增.岩土介质横观各向同性黏弹性优化反分析理论与应用研究[博士学位论文][D].上海:同济大学,2001.(LIU Xuezeng.Back analysis of transversely isotropic viscoelasticity of rock and soil medium and its application[Ph.D.Thesis][D].Shanghai:Tongji University,2001.(in Chinese))
[16]吕爱钟,蒋斌松.岩石力学反问题[M].北京:煤炭工业出版社,1998.(LU Aizhong,JIANG Binsong.Back analysis of rock mechanics[M].Beijing:China Coal Industry Publishing House,1998.(in Chinese))
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心