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《Journal of Tongji University》 2003-09
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Visco-elastic Back-analysis of Experimental Cavity in Underground Factory

QIU Sheng-hua, YANG Lin-de, WANG Yue-zhao, ZHANG Guo-feng (1. Shanghai Zhu' an Construction and Development Corp. Ltd, Shnaghai 200030, China; 2. Department of Geotechnical Engineering, Tongji University,Shanghai 200092,China; 3. Yixing Hydroelectric Station Construction Corp. Ltd,Yixing 214206,China)  
Based on the measured data of a certain experimental cavity in underground factory, the paper studied a visco-elastic back analysis method of experimental cavity. It assumed that the initial rock stresses is in linear distribution, all layers of strata are regarded as layered homogeneous in calculation districts, and this model is applied to doing calculation. As to the slant and layered stratum, flaccidity interlayer and fault texture, they separately plotted into elements to simulate the distributive character of layered rock mass and some anisotropic macro-effects of cavity engineering on the stresses and strains in finite element (FEM) analysis. According to the geological data,we evaluated rock medium characteristic parameters on these strata away from the cavity to simplify the calculation. The paper calculated the value of initial rock stresses by elastic back analysis, and achieved the material visco-elastic parameters of the surroundings in neighboring experimental cavity by applying tri-element model to back analysis. It provided reliable basis for the engineering designs and supports.
【Fund】: 国家自然科学基金资助项目(59878038);; 上海市重点学科建设资助项目
【CateGory Index】: TV223
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