Measurements and application of in-situ stress at a new type of diversion hydroelectric project in Southwest China
In order to realize the geostress state of a new pattern hydroelectric project in southwest china, demonstrate the scheme design of the air-cushion surge tank for the hydroelectric project, the hydraulic fracturing technology has been adopted to define the ln-situ stress and related rock mechanics parameters of rock mass around the high pressure cavern, and utilizes the data of stress measurements, together with nu- merical simulation and regression analysis to synthetically analyze the ground stress field at engineering sites. The results show that the direction of maximum principle stress at engineering sites is N33°～52°W, the elevation is N26°～39°W, the value is 7.35～8.16MPa; that the maximum principal stress in the rock mass around the high-pressure cavern is 10.63MPa, the minimum principal stress is 4.45MPa, The tensile strength is about 4.4～8.6MPa, the permeability under the pressure of 3～5.0MPa is less than 2.0 Lu; the jacking strength is<1.0～5.5MPa. In the main The rock mass suit the air-cushion surge tank, Whereas the rock of the vertical bore at the air-cushion surge tank is fragmentation, It is suggested that increasing the depth of the cavern in order to enhance carrying capacity of the rock. In addition there exist some tensile fissures in the rock mass of high-pressure cavern, which have poor bearing strength, good connectivity and severe water permeability, and which are a huge hidden trouble for the non-supported high-pressure cavern construction. The effective high-pressure grouting measures shall improve the integrity of rock mass structures and enhance the high-pressure sealing function, which is a key point for the establishment of the project.
Yang Shuxin Bai Mingzhou Wang Chengliang Wang Chenghu Guo Qiliang
Beijing Jiao tong University,Beijing,China,100044 Institute of Crustal Dynamics,CSB,Beijing,China,100085
国际会议
International Symposium and The 7th Asian Regional Conference of IAEG(国际工程地质与环境协会年会暨第七届亚洲工程地质会议)
成都
英文
231-238
2009-09-09（万方平台首次上网日期，不代表论文的发表时间）