段家坪隧道区域初始地应力场反演分析
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摘要
为解决地应力释放导致隧道初期支护变形失稳难题,以隧道区域地质资料为基础,结合现场地应力实测数据,采用多元线性回归分析方法,进行了隧道工程区域初始地应力场的数值模拟反演计算分析,获得隧道围岩初始地应力场分布规律。研究结果表明:隧道测区段围岩处于高地应力状态,测点地应力反演值与实测值误差较小,反演结果合理、可靠。通过隧道围岩强度应力对比分析,隧道DK453+500m～DK454+400m段为高应力状态,地应力释放会导致隧道初期支护开裂变形,与现场实际情况相一致。
In order to solve that problem of the instability of the primary support deformation of the tunnel caused by the release of the initial ground stress,based on the geological data of the tunnel area,a multielement linear regression analysis method is adopted,and the numerical simulation and inversion calculation analysis of the initial ground stress field in the tunnel engineering area is carried out by adopting a multivariate linear regression analysis method.The distribution of the initial stress field in the surrounding rock of the tunnel is obtained.The result shows that the error between the measured values and the inversion values is small,and the inversion result is reasonable and reliable.According to the analysis of strength stress ratio of tunnel surrounding rock,the DK453+500 m～DK454+400 msection of tunnel is in high stress state,and the release of the initial ground stress can lead to the deformation and cracking of the primary support,which is in line with the actual situation on the site.
In order to solve that problem of the instability of the primary support deformation of the tunnel caused by the release of the initial ground stress,based on the geological data of the tunnel area,a multielement linear regression analysis method is adopted,and the numerical simulation and inversion calculation analysis of the initial ground stress field in the tunnel engineering area is carried out by adopting a multivariate linear regression analysis method.The distribution of the initial stress field in the surrounding rock of the tunnel is obtained.The result shows that the error between the measured values and the inversion values is small,and the inversion result is reasonable and reliable.According to the analysis of strength stress ratio of tunnel surrounding rock,the DK453+500 m～DK454+400 msection of tunnel is in high stress state,and the release of the initial ground stress can lead to the deformation and cracking of the primary support,which is in line with the actual situation on the site.
引文
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[10]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):2305-2312.
[11]王成虎,郭啟良,侯砚和,等.地下水封油库场址地应力场及工程稳定性分析研究[J].岩土工程学报,2010,32(5):698-705.
[12]胡秀宏,王成虎.蒙华铁路段家坪隧道钻孔地应力测试报告[R].北京:中国地震局地壳应力研究所,2017.
[2] 谢红强,何江达,肖明砾.大型水电站厂区三维地应力场回归反演分析[J].岩土力学,2009,30(8):2471-2476.
[3] 徐正,李天斌,孟陆波,等.鹧鸪山隧道地应力反演模型与三维地应力[J].成都理工大学学报(自然科学版),2014,41(2):243-250.
[4] 唐浩,李天斌,孟陆波,等.川藏铁路二郎山深埋隧道的地应力场反演分析[J].铁道建筑,2015,(3):65-69.
[5] 王庆武,巨能攀,黄健,等.桑珠岭特长隧道初始地应力场反演分析[J].科学技术与工程,2016,25(16):137-143.
[6] 郭运华,朱维申,李新平,等.基于FLAC3D改进的初始地应力场回归方法[J].岩土工程学报,2014,32(5):1-7.
[7] 莫海鸿.某地下厂房初始地应力场的反演分析[J].华南理工大学学报(自然科学版),1995,23(1):159-164.
[8] 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[J].岩土力学,2010,31(1):246-252
[9] 佘成学,熊文林,陈胜宏.边坡初始地应力场的应力函数与有限元联合反演法[J].武汉水利电力大学学报,1995,28(4):366-371.
[10]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):2305-2312.
[11]王成虎,郭啟良,侯砚和,等.地下水封油库场址地应力场及工程稳定性分析研究[J].岩土工程学报,2010,32(5):698-705.
[12]胡秀宏,王成虎.蒙华铁路段家坪隧道钻孔地应力测试报告[R].北京:中国地震局地壳应力研究所,2017.