MEASUREMENTS OF IN-SITU STRESS IN THE PUSHIHE HYDROPOWER STATION, LIAONING
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摘要: 为了解浦石河抽水蓄能电站枢纽区现今应力状态,采用空心包体应力计在探洞内进行了地应力测量。共布设5个地应力测点,每个测点都进行了多次测量,采用最小二乘法对5个测点测量结果进行分别计算和综合计算。测量结果表明:最大主应力近于水平,方向为N79°W,应力量值为7.1MPa;各测点不同测段测量结果有一定偏差,这主要是由于不同部位岩体构造条件所致,随着测量次数增多,最大主应力优势方向还是比较明显的。最后根据实测结果对电站枢纽区现今应力作用特征进行了分析,并对工程设计提出了建议。Abstract: In-situ stress measurements were made in a survey tunnel using the hollow inclusion stress gauge in order to gain knowledge of the present stress state of the Pushihe hydropower station.A total of five in-situ stress-measuring sites were deployed and many measurements were made at each measuring sites.The calculation and integrated calculation of measurement results from the five sites were performed respectively by using the least squares.The results show that:the maximum principal stress is nearly horizontal and oriented in a N79°W direction,with a stress magnitude of 7.1 MPa.Although the measurement results of different segments of the measuring sites show certain deviations mainly due to the structural conditions of rock masses at different sites,the preferred orientation of the maximum principal stress is relatively prominent.Finally,based on the measurement results,the characteristics of the present stresses in the hinge area of the hydropower station are analyzed and some suggestions for the engineering design are presented.
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