COMPREHENSIVE TESTS AND APPLIED STUDIES OF HYDRAULIC FRACTURING IN THE ROCK MASS OF THE YANGJIANG PUMPING STORAGE POWER STATION
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摘要: 阳江抽水蓄能电站的输水隧洞围岩承受最大静内水压力高达7.83MPa, 因此原地应力状态、围岩自身承载能力及高压透水性状等对工程的科学设计不可或缺。测量结果表明, 工程区现今地壳应力场的总体特征为:水平主应力为最大主应力, 最大水平主应力的优势方向为NW-NWW向; 厂房和高压岔管区围岩的最大主应力值一般为14.5±0.5MPa, 最小主应力值一般为9±0.5MPa; 围岩自身的抗载强度一般为10~14MPa; 在8~10MPa高压力作用下围岩基本不透水。洞室围岩物理力学参数的这些测试成果, 为工程的科学设计提供了可靠依据。Abstract: The surrounding rocks of the water tunnel of the Yangjiang pumping storage power plant are required to bear a maximum static pressure of 7.83 MPa; therefore, the state of in-situ stress, dead loadbearing capacity of surrounding rocks and high-pressure permeability are all essential data for the scientific design of the project.The measurement results show that the general characteristics of the present crustal stress field of the project area are as follows:the horizontal principal stress is the maximum principal stress, and the preferred orientation of the maximum horizontal principal stress is NW-WNW, the maximum principal stress of surrounding rocks of the plant buildings and high-pressure branch tunnel area is generally 14.5±0.5 MPa and the minimum principal stress is 9±0.5 MPa; the dead load-bearing capacity of surrounding rocks is 10-14 MPa; and the surrounding rocks are essentially impermeable at high pressures of 8-10 MPa.The results of those measurements of physical-mechanical parameters of surrounding rocks offer a reliable basis for the scientific design of the project.
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图 1 水压致裂应力测量原始压力记录曲线
Figure 1. Primary pressure record of hydraulic fracturing stress measurements of borehole Zky001
图 3 各测点各孔平面应力值随孔深的分布
Figure 3. Variation of plane stress with depth in various boreholes
图 4 Zky001孔461.09~4621.19m测段压力-流量曲线
Figure 4. Pressure-flow curve in the measuring interval 461.09~4621.19m in borehole Zky003
表 1 Zky001孔水压致裂应力测量结果一览表
Table 1. Summary of hydraulic fracturing stress measurements of borehole Zky001
表 2 三维应力测量计算结果
Table 2. Three dimensional stress measurement results
表 3 岩体原地承载力的测量结果
Table 3. Measurements of in-situ load-bearing capabilities of rock masses
表 4 高压透水率测试结果
Table 4. Results of high-pressure permeability tests
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