长大深埋隧道工程区地应力状态预测与实例分析

发布时间：2018-06-30 22:18

本文选题：应力场预测 + 修正Sheorey模型　；参考：《岩土工程学报》2014年05期

【摘要】：深埋隧道工程区地应力场的预测一直是工程技术人员所需迫切解决的难题。针对此问题提出了解决方案,即利用世界应力图、中国大陆地壳应力环境数据库以及前人研究成果可获得工程区应力场方向的初步认识,同时还可以利用Anderson断层力学理论分析工程区可能的主应力方向。在获得原地应力实测资料后,利用较为翔实的工程地质资料基于Hoek-Brown强度理论估算工程区范围内的岩体强度,然后利用修正Sheorey模型和数值模拟手段开展工程区深埋区域的地应力状态的预测分析。某水电站工程区位于青藏高原西缘。3个钻孔的水压致裂原地应力实测数据显示三向主应力之间的关系为SHShSV或SHSVSh,表明最大水平主应力占主导地位,水平构造作用力明显。实测所得到的测区最大水平主应力方向为NEE向(N70.3°—89°E);而世界应力图给出的区域应力场方向为NE向。通过修正Sheorey模型对深埋引水隧洞沿线的工程区应力状态进行了预测,结果显示,埋深最大的地方,最大最小水平应力值分别为56.70,40.14 MPa。
[Abstract]:The prediction of ground stress field in deep-buried tunnel engineering area is always a difficult problem that engineers and technicians need to solve urgently. A solution to this problem is put forward, that is, using the world stress map, the crustal stress environment database of the Chinese mainland and the previous research results, the direction of the stress field in the engineering area can be obtained. At the same time, Anderson fault mechanics theory can be used to analyze the possible principal stress direction in the engineering area. On the basis of Hoek-Brown strength theory, the rock mass strength in the engineering area is estimated by using the detailed engineering geological data after the in-situ stress measured data are obtained. Then the modified Sheorey model and numerical simulation are used to predict and analyze the in-situ stress state in the deep buried area of the engineering area. A hydropower project area is located on the western edge of the Qinghai-Tibet Plateau. The measured data of in-situ stress caused by hydraulic fracturing of three boreholes show that the relationship between the three principal stresses is SHShSV or SHSV Sh.It shows that the maximum horizontal principal stress is dominant and the horizontal tectonic force is obvious. The measured maximum horizontal principal stress direction is NEE direction (N70.3 掳-89 掳E), while the regional stress field direction given by the world stress map is NE direction. Based on the modified Sheorey model, the stress state of the engineering area along the deep tunnel is predicted. The results show that the maximum and minimum horizontal stress values are 56.70 ~ 40.14 MPa where the buried depth is the largest.
【作者单位】：中国地震局地壳应力研究所(地壳动力学实验室);中国地质大学(北京);
【基金】：国家自然科学基金面上基金项目(41274100,51038009) 中央级科研院所基本科研业务专项项目(ZDJ2012 20)
【分类号】：U451.1

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