Regression Analysis Of Initial Geostress Field For Underground Workshop Area

The development and use of underground spatial is recent development tendencies in the 21st century.along with west big developmentstrategy for our country, massive waterconserv-ancy projects underground hole room will be builded in western mountain canyon area,these underground projects will be stable or not directly affect the engineering construction success or failure and the operation benefit,but theunderground projects stability and the crag body initial stresscondition close correlation,they will directly affect the security and the reliability of design and the construction for the underground structure.In addition, earthquake intensity of the western area is high,it similarly has the vital significance to discuss the response of underground strcture under the earthquake load functiondynamic.This article based on the underground workshop region of the Hongping pumped storage power station,discuss how to increased the initial geostress field truthfully measuringpoint aspect and so on how did arrangement, the measuring technique, actual stress result analysis processing and regression analysis method and so on.This article also analysis the initial geostress field and the majoreffect factor,provide a moreaccurate initial material for excavated the design for the tunnel, in addition discussionusing the method for response of earthquake of underground structure with FLAC^3D.The main works as follows:(1) Summarized the influence factor of initial geostress field,it provides the analysis basis for the further quantitativeinvestigation.(2) Discussing the mesure analysis technology and its distributed rule from the analysis processing such as crustal stress solid measuring point arrangement, measuringtechnique, actual result aspect and so on.(3) Introducing the regression analysis principle and the method, comparative AYSYS, FORTRAN and the FLAC^3D anslysis the characteristics of them characteristics.Proposing one method for regression of initial stress field regression,the mothod union them,and the method can provide actual initial stress field for the design for excavating of underground projects.(4) Base on the underground workshop region of the Hongping pumped storage power st-ation,carrying on regression analysis for the initial geostress field of the region of station with method of this article,and then we can obtained the actual initial geostress field. The computed result indicated that, the inversion return precision was satisfying,and the method this article proposed is accuracy and rationality.(5) Introducing the dynamic ananlysis theory and method based on the FLAC^3D,using thefree field boundary of FLAC^3D,simulating the transmission of earthquake wave in the infinite territory,discussing sersmic analysis method and the implementation technology of underground structure base on the FLAC^3D,and analyzing the dynymic response of the submersion underground structure through calculated the example computation.