两水隧道地应力测量及三维地应力场多元回归分析
发布时间：2018-09-17 16:44
【摘要】：文章针对兰渝铁路两水隧道选择1个测孔、7个试验段进行水压致裂地应力测量。测试结果表明两水隧道的现今应力场以水平应力为主导,应力量级属于极高应力水平。最大主应力方向为N80°W~EW,与区域构造应力场方向一致。该测点的最大水平主应力方向与隧道轴线方向夹角较小,利于隧道围岩稳定。结合实际的地质条件和地层参数,在实测地应力结果的基础上,建立隧道区两个大规模三维计算模型,通过有限元分析软件ANSYS对重力、水平挤压和剪切等4种工况的自重应力场和构造应力场分别进行数值计算,根据多元回归方程,宏观扩展分析两水隧道区域的原岩地应力场。分析结果表明,两水隧道大部分区段的水平横向地应力值为7.0~9.0 MPa、水平横向侧压力系数为1.0~1.5。宏观地应力场的分析结果对工程设计与施工具有重要参考价值。
[Abstract]:In this paper, one hole is selected for the two-water tunnel of the Lanzhou-Chongqing railway, and seven test sections are used to measure the in-situ stress caused by hydraulic fracturing. The test results show that the present stress field of two-water tunnel is dominated by horizontal stress, and the order of stress belongs to extremely high stress level. The direction of maximum principal stress is N80 掳WW, which is consistent with the direction of regional tectonic stress field. The angle between the direction of maximum horizontal principal stress and the direction of tunnel axis is small, which is beneficial to the stability of tunnel surrounding rock. Combined with the actual geological conditions and formation parameters, based on the measured results of in-situ stress, two large-scale three-dimensional calculation models were established in the tunnel area. The gravity was analyzed by the finite element analysis software ANSYS. The gravity stress field and tectonic stress field of four working conditions, horizontal extrusion and shear, were numerically calculated respectively. According to the multivariate regression equation, the geostress field of the original rock in the area of the two-water tunnel was analyzed by macroscopic expansion. The results show that the horizontal lateral stress of most sections of the two-water tunnel is 7.09.0 MPa, horizontal lateral pressure coefficient is 1.0 ~ 1.5. The results of macroscopic stress field analysis have important reference value for engineering design and construction.
【作者单位】： 兰州交通大学土木工程学院;中铁第一勘察设计院集团有限公司;西北民族大学土木工程学院;长江科学院;
【基金】：铁道部科技开发计划项目(2009G009B4) 国家自然科学基金项目(51268031) 甘肃省基础研究创新群体计划项目(145RJIA332)
【分类号】：U451.1
本文编号：2246520
[Abstract]:In this paper, one hole is selected for the two-water tunnel of the Lanzhou-Chongqing railway, and seven test sections are used to measure the in-situ stress caused by hydraulic fracturing. The test results show that the present stress field of two-water tunnel is dominated by horizontal stress, and the order of stress belongs to extremely high stress level. The direction of maximum principal stress is N80 掳WW, which is consistent with the direction of regional tectonic stress field. The angle between the direction of maximum horizontal principal stress and the direction of tunnel axis is small, which is beneficial to the stability of tunnel surrounding rock. Combined with the actual geological conditions and formation parameters, based on the measured results of in-situ stress, two large-scale three-dimensional calculation models were established in the tunnel area. The gravity was analyzed by the finite element analysis software ANSYS. The gravity stress field and tectonic stress field of four working conditions, horizontal extrusion and shear, were numerically calculated respectively. According to the multivariate regression equation, the geostress field of the original rock in the area of the two-water tunnel was analyzed by macroscopic expansion. The results show that the horizontal lateral stress of most sections of the two-water tunnel is 7.09.0 MPa, horizontal lateral pressure coefficient is 1.0 ~ 1.5. The results of macroscopic stress field analysis have important reference value for engineering design and construction.
【作者单位】： 兰州交通大学土木工程学院;中铁第一勘察设计院集团有限公司;西北民族大学土木工程学院;长江科学院;
【基金】：铁道部科技开发计划项目(2009G009B4) 国家自然科学基金项目(51268031) 甘肃省基础研究创新群体计划项目(145RJIA332)
【分类号】：U451.1
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