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《Journal of Earthquake Engineering and Engineering Vibration》 2011-02
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Modeling of in-situ stress field in a hydropower station and stability analysis of its project region

YAO Rui1,YANG Shuxin1,ZHOU Jun2,MI Qi3(1.Institute of Crustal Dynamics,CEA,Beijing 100085,China;2.Northwest Investigation,Design and Research Institute,Xi'an 710065,China;3.College of Earth Science,GUCAS,Beijing 100049,China)  
According to the data from engineering geological exploration and in-situ stress measurement of a hydropower station at the upper Yellow River,we establish a finite element model using Marc Mentat software.With stress regression analysis method,we model the stress field in the study region: Firstly,we confirm self-gravity and tectonic stress as the undetermined regression parameters;then regress the correlated coefficients according to regression theory;finally calculate the stress field of project region.Comparing in-situ measurement data and the calculated results,we find out that there are little difference between them both in magnitude and orientation.The maximum principle stresses near powerhouse are about 8MPa.The orientation of maximum horizontal stress approaches E-W.The effect of self-gravity on the stress field is more than that of tectonic stress in the region.The features displayed in our inversion results are broadly in line with our expectation.The inversion results show that the stability of powerhouse is great.
【Fund】: 中国地震局行业科研专项(201108008);; 铁道部重大科研课题(2009G005-D)
【CateGory Index】: TV221.2
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