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《Chinese Journal of Underground Space and Engineering》 2014-05
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Study on In-situ Deformation Test of Interlayer Shear Zone Based on Divided Layer Calculation

Yan Changbin;Du Weichang;School of Civil Engineering,Zhengzhou University;Yellow River Engineering Consulting Co. ,Ltd.;  
Because of unhomogeneity of composite rock mass with interlayer shear zone,there is a synthetical modulus of composite rock mass can only be obtained by traditional pressure-bearing plate test,but the deformation parameters of interlayer shear zone cannot be obtained. The characters of interlayer shear zones at some dam sites of big hydraulic project in red clastic area of Yellow River middle reaches were introduced. A rigid pressure-bearing plate in-situ experiment with central borehole was conducted at some typical prospect adit. The relationship curves between pressure and deformation of composite rock mass,upper rock mass and lower rock mass of interlayer shear zone were directly obtained by arranging different deep hydro-anchor heads under beforehand remaining upper protecting rock. Their deformation parameters are calculated by the deduced compressive deformation formula of deep rock mass. According to divided layer calculation,the equivalent deformation parameters of interlayer shear zone are calculated by the difference between upper rock mass and lower rock mass of interlayer shear zone. Research results show that the deformation parameters of interlayer shear zone are lower than those of upper rock mass,lower rock mass and composite rock mass. Its equivalent deformation modulus is 0. 72 GPa,and its equivalent elastic modulus is1. 41 GPa.
【Fund】: 黄河勘测规划设计有限公司自主研究开发项目(2009-ky34(2))
【CateGory Index】: TV221.2
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