Estimation of Deformation Modulus in a Weathered Granite Using the Decrease in Transmissivity with Depth
Both hydraulic and mechanical properties of fractured rock masses are related to the geometry of fractures. From the perspective of hydro-mechanical coupling, the nonlinear decrease in transmissivity with depth can be utilized to calculate fracture normal stiffness of large scale rock masses. In the current study, the degree of weathering and the non-linear decrease in transmissivity with depth are considered simultaneously to estimate fracture normal stiffness of a granite rock mass. The equations of transmissivity-depth correlation in each zone with different degree of weathering are employed to calculate the corresponding fracture normal stiffness; then the equivalent continuum model is utilized to calculate deformation modulus of the rock masses. In the highly weathered zone, the deformation modulus ranges between 2 and 4 GPa; in the moderately weathered zone, the deformation modulus ranges from 15 to 19 GPa; in the slightly weathered zone, the deformation modulus ranges between 24 to 26 GPa. Compared with the values of deformation modulus obtained from measurements or engineering analogy method, which were determined by others, the results in the present study are reasonable.
X.W.Jiang X.S.Wang L Wan X.Wu A.B.Kang
School of Water Resources and Environment, China University of Geosciences, Beijing
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）