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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SH>Sh>SV或SH>SV>Sh,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。
The prediction of the in-situ stress field in the deep tunnel engineering area has always been an urgent problem to be solved by engineers and technicians. In order to solve this problem, a preliminary solution to this problem is proposed, that is, using the world stress map, the Chinese mainland crustal stress environment database and the previous research results to get preliminary understanding of the stress field direction in the project area. Anderson fault mechanics theory can also be used to analyze potential project owners Stress direction. After obtaining the in-situ stress measurement data, the rock mass intensity within the project area is estimated based on the Hoek-Brown strength theory by using more detailed engineering geological data. Then the modified Sheorey model and numerical simulation are used to carry out the in-situ stress in the deep area of the project area Predictive analysis of the state. A hydropower station project is located in the western edge of the Qinghai-Tibet Plateau. The data of in-situ stress measurements of hydraulic fractures in 3 boreholes show that the relationship between the three principal stresses is SH> Sh> SV or SH> SV> Sh, indicating that the maximum horizontal principal stress dominates and the horizontal tectonic force is obvious . The measured maximum principal stress direction of the surveyed area is NEE direction (N70.3 ° -89 ° E), while the direction of regional stress field given by the world stress diagram is NE direction. The modified Sheorey model is used to predict the stress state in the engineering area along the deep diversion tunnel. The results show that the maximum and minimum horizontal stress values are 56.70 and 40.14 MPa respectively at the maximum depth.