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工程区地应力场,与区域构造背景和控制现代构造活动的板块碰撞所形成的构造应力场有密切关系。工程实践表明,由于高应力的作用引起地下洞室破坏、边坡失稳和工程区的构造稳定性等问题,随着工程建设的深入开展也日益显得突出,并受到人们的普遍关注。水利水电工程的可行性研究阶段,除根据地质体的历次构造变形场,探索各构造阶段的应力场以及它们的叠加和再分布的历史渊源外,更重要的是求得现代应力场的分布与定量数值,据以评价水工建筑物区的工程地质条件,合理地选择坝(场)址拟定枢纽布置的最佳方案,以达到缩短建设周期,降低工程造价的予期目的。
The stress field in the project area is closely related to the tectonic stress field formed by the regional tectonic setting and the plate collision controlling the modern tectonic activity. Engineering practice shows that due to the effect of high stress caused by underground caverns, slope instability and structural stability of the project area and other issues, with the further development of the project is also increasingly prominent, and has been widespread concern. In the stage of feasibility study of water conservancy and hydropower project, besides the historical deformation field of geologic body and the exploration of the stress field in each tectonic stage and their history of superposition and redistribution, it is more important to find out the distribution of modern stress field and Quantitative values, so as to evaluate the hydraulic construction area engineering geological conditions, the rational choice of dam (field) site planning hub layout of the best program to shorten the construction period, reduce the project’s expected purpose.