基于二次应力实测值的初始应力场反分析法及其工程应用
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摘要
初始应力场对于岩土工程数值计算至关重要,但通常难以准确确定。目前,由现场实测资料反演初始地应力场的方法很多,且各有优势。与以往不同,作者提出了在隧道等地下工程二维计算中,以现场实测的二次应力来确定计算模型的边界条件,从而得到与实际相符的初始应力场来进行反演分析的新思路和新方法,获得了十分满意的效果,该法较以往方法经济、准确,且容易操作,可为今后同类课题借鉴。结合实际工程,采用该方法得到了计算分析域的初始应力场的分布规律,与实测结果基本一致,证明了该方法的正确性和实用性。
Initial geostress is essential for geotechnical engineering numerical simulation,but usually can not be easily determined.Based on the measured geostress data,there have been many kinds of methods with respective advantages for initial geostress field back-analysis.Unlike past research methods,this paper presents an idea and a method for establishing the stress boundary condition of numerical model of tunnel engineering by the secondary stress value measured in the field,and then the back analysis research is done based on the initial stress field established before.Satisfactory effect was achieved.Compared with past methods,this method is very economical,exact and operable,which provides a new and valid way for similar research subjects in the future.Combined with practical engineering and based on this method,We established the geostress distribution characteristics which was in accordance with the measured value very well,and this confirmed the correction and practical value of the mentioned method.
Initial geostress is essential for geotechnical engineering numerical simulation,but usually can not be easily determined.Based on the measured geostress data,there have been many kinds of methods with respective advantages for initial geostress field back-analysis.Unlike past research methods,this paper presents an idea and a method for establishing the stress boundary condition of numerical model of tunnel engineering by the secondary stress value measured in the field,and then the back analysis research is done based on the initial stress field established before.Satisfactory effect was achieved.Compared with past methods,this method is very economical,exact and operable,which provides a new and valid way for similar research subjects in the future.Combined with practical engineering and based on this method,We established the geostress distribution characteristics which was in accordance with the measured value very well,and this confirmed the correction and practical value of the mentioned method.
引文
[1]Fu Chenghua,Wang Weiming,Chen Shenghong.Back analy-sis study on initial geostress field of dam site for XILUODUhydropower project[J].Chinese Journal of Geotechnical En-gineering,2006,25(11):2305-2312.[付成华,汪卫命,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):2305-2312.]
[2]Chai Hejun,Liu Haowu,Wang Minghua.Stress field simula-tion and fitting br 3D elastoplastic finite element for largehydropower projct[J].Chinese Journal of Geotechnical En-gineering,2002,21(9):1314-1318.[柴贺军,刘浩吾,王明华.大型电站坝区应力场三维弹塑性有限元模拟和拟合[J].岩石力学与工程学报,2002,21(9):1314-1318.]
[3]Guo Huaizhi,Ma Qichao,Xue Xicheng,et al.The nanlyticalmethod of the initial stress field for rock masses[J].ChineseJournal of Geotechnical Engineering,1983,5(3):64-75.[郭怀志,马启超,薛玺成,等.岩体初始应力场的分析方法[J].岩土工程学报,1983,5(3):64-75.]
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[6]Jin Xiaoguang,Li Tianbin.Study on stress restoring and nu-merical modeling in geo-stress measure[J].Journal ofChengdu University of Technology,1999,26(3):287?290.[靳晓光,李天斌.地应力测量的应力恢复法试验和数值模拟研究[J].成都理工学院学报,1999,26(3):287?290.]
[7]Jin Xiaoguang,Li Xiaohong.Site testing and monitor of in-duced stress field in surrounding rocks of underground en-geering[J].Chinese Journal of Rock Mechanics and Engi-neering,2002,21(5):651?653.[靳晓光,王兰生,李晓红.地下工程围岩二次应力场的现场测试与监测[J].岩石力学与工程学报,2002,21(5):651?653.]
[8]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2004.
[9]Ma Kang,Xu Jin,Wang Lansheng,et al.An analysis on thecharacteristics of surrounding-strata stress-deformation fieldof XueFeng highway tunnel engineering[J].Highway,2007,3:177?182.[马亢,徐进,王兰生,等.雪峰山公路隧道开挖过程中围岩应力形变场特征分析[J].公路,2007,3:177-182.]
[10]杨林德.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.
[11]Zhang Zhifeng,Zhang Qin,Huang Yongqing,et al.3-Dgeostress field and surrounding rock stability analysis by an-sys software:As an example of pump water station to storeenergy in Yixing City[J].Hydrogeology and EngineeringGeology,2003(6):49?51.[张志峰,张勤,黄咏庆,等.基于Ansys的三维地应力场及洞室围岩稳定分析—以宜兴抽水蓄能电站为例[J].水文地质工程地质,2003(6):49?51.]
[12]Xiao Ming.Three-dimensional numerical model of construc-tion processfor underground opening[J].Chinese Journal ofGeotechnical Engineering,2000,22(4):421-425.[肖明.地下洞室施工开挖三维动态过程数值模拟分析[J].岩土工程学报,2000,22(4):421-425.]
[13]Gu Lijiang.A study on the tunnel surrounding rock dis-placement monitoring and the relationship of displacementand support structures[D].Chengdu University of Technolo-gy,2005.[辜利江.公路隧道围岩位移监测及位移与支护结构关系研究[D].成都:成都理工大学,2005.]
[14]王兰生,李天斌,徐进,等.二郎山隧道高地应力与围岩稳定问题[M].北京:地质出版社,2006.
[15]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.
[2]Chai Hejun,Liu Haowu,Wang Minghua.Stress field simula-tion and fitting br 3D elastoplastic finite element for largehydropower projct[J].Chinese Journal of Geotechnical En-gineering,2002,21(9):1314-1318.[柴贺军,刘浩吾,王明华.大型电站坝区应力场三维弹塑性有限元模拟和拟合[J].岩石力学与工程学报,2002,21(9):1314-1318.]
[3]Guo Huaizhi,Ma Qichao,Xue Xicheng,et al.The nanlyticalmethod of the initial stress field for rock masses[J].ChineseJournal of Geotechnical Engineering,1983,5(3):64-75.[郭怀志,马启超,薛玺成,等.岩体初始应力场的分析方法[J].岩土工程学报,1983,5(3):64-75.]
[4]冯夏庭.智能岩石力学导轮[M].北京:科学出版社,2000.
[5]徐进.隧道洞壁应力测试方法及其装置(P),中国专利:ZL200610022359,2008-01-02.
[6]Jin Xiaoguang,Li Tianbin.Study on stress restoring and nu-merical modeling in geo-stress measure[J].Journal ofChengdu University of Technology,1999,26(3):287?290.[靳晓光,李天斌.地应力测量的应力恢复法试验和数值模拟研究[J].成都理工学院学报,1999,26(3):287?290.]
[7]Jin Xiaoguang,Li Xiaohong.Site testing and monitor of in-duced stress field in surrounding rocks of underground en-geering[J].Chinese Journal of Rock Mechanics and Engi-neering,2002,21(5):651?653.[靳晓光,王兰生,李晓红.地下工程围岩二次应力场的现场测试与监测[J].岩石力学与工程学报,2002,21(5):651?653.]
[8]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2004.
[9]Ma Kang,Xu Jin,Wang Lansheng,et al.An analysis on thecharacteristics of surrounding-strata stress-deformation fieldof XueFeng highway tunnel engineering[J].Highway,2007,3:177?182.[马亢,徐进,王兰生,等.雪峰山公路隧道开挖过程中围岩应力形变场特征分析[J].公路,2007,3:177-182.]
[10]杨林德.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.
[11]Zhang Zhifeng,Zhang Qin,Huang Yongqing,et al.3-Dgeostress field and surrounding rock stability analysis by an-sys software:As an example of pump water station to storeenergy in Yixing City[J].Hydrogeology and EngineeringGeology,2003(6):49?51.[张志峰,张勤,黄咏庆,等.基于Ansys的三维地应力场及洞室围岩稳定分析—以宜兴抽水蓄能电站为例[J].水文地质工程地质,2003(6):49?51.]
[12]Xiao Ming.Three-dimensional numerical model of construc-tion processfor underground opening[J].Chinese Journal ofGeotechnical Engineering,2000,22(4):421-425.[肖明.地下洞室施工开挖三维动态过程数值模拟分析[J].岩土工程学报,2000,22(4):421-425.]
[13]Gu Lijiang.A study on the tunnel surrounding rock dis-placement monitoring and the relationship of displacementand support structures[D].Chengdu University of Technolo-gy,2005.[辜利江.公路隧道围岩位移监测及位移与支护结构关系研究[D].成都:成都理工大学,2005.]
[14]王兰生,李天斌,徐进,等.二郎山隧道高地应力与围岩稳定问题[M].北京:地质出版社,2006.
[15]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.
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