In situ tests and a stochastic structural model of rock and soil aggregate in the Three Gorges reservoir area,China
会议名称：《中国科学院地质与地球物理研究所2004学术年会》
会议日期：2004年
学科分类：08[工学] 081601[工学-大地测量学与测量工程] 0816[工学-测绘科学与技术]
关 键 词：Rock and soil aggregate In situ test Stochastic structural model Monte-Carlo method Numerical modelling The Three Gorges
摘 要：The loose quaternary deposit,originated from landslide deposits,weathering residues,slope wash and diluvial deposits etc, prevails in the Three Gorges reservoir area,*** inhomogeneous geological material comprises mainly rock blocks,clay and sandy *** emphasize its fabric,it is termed rock and soil aggregate(RSA).The study of the mechanical behaviour of RSA is of great importance in reinforcement design for rock slopes. In situ direct shear tests on three samples of RSA in the Three Gorges reservoir area were carried out to examine its mechanical *** on the geological investigation and statistics,a stochastic structural model of RSA was *** distribution functions of the stochastic variables,including spatial location,size,shape and azimuth ofthe rock blocks inside RSA,are developed by means of the Monte-Carlo *** mechanical response of the RSA was numerically simulated using FLAC. By comparsion,the numerical results coincided with the test results(Fig.1). It was shown from both in situ tests and numerical modelling that for the RSA with a high rock percentage,initial yielding and strain hardening appeared in its deformation *** in situ tests of RSA also indicated that the increase of Young’s modulus and ultimate shear strength was not proportional to the rock *** was observed form the samples studied that the fracture patterns of RSA exhibited shear failure with fluctuating fracture *** characteristics are predicated by the inherent structure of RSA. The comparison of the numerical modelling with the in situ tests indicates that the numerical procedures based on the stochastic structural model can serve for studying the complex mechanical response of the RSA material,not only in simple stress states,but also under various stress ***,the development and propagation of the failure inside RSA can be examined by this method,which it is difficult to observe,in field tests.