一种基于复变量求导法的岩土体抗剪强度参数反演新方法

边坡稳定性分析中,岩土体(含结构面)抗剪强度参数的确定至为重要.工程实践中利用边坡上实测的位移数据反演岩土参数是一种理想的参数确定方法.当前采用的位移反分析方法在反演弹性模量、泊松比及地应力等参数时已经取得了较好的成果,但在反演抗剪强度参数时仍未获得理想的结果.本文针对岩土体抗剪强度参数反演中所存在的困难,将复变量求导法、优化方法以及岩土弹塑性有限元法结合起来,提出一种适用于岩土体抗剪强度参数的反演分析新方法,通过测点实测位移反演计算出岩土体的抗剪强度参数.算例结果表明,该方法具有较高的计算精度和搜索效率,是一种值得推广的位移反分析方法.

A new inversion method of rock-soils parameters based on complex-variable-differentiation method

It is of prime importance to determine the shear strength parameters of rock-soils (including discontinuity) in slope stability analysis. In engineering practice, the inversion of parameters of rock-soils with the measured displacement of slope is an ideal method of determining parameters. Meanwhile, the existing method of back analysis has obtained sound result of inversion parameters of the elastic modulus, poisson's ratio and geostress, but not ideal result in inversion process of shear strength parameters. This paper, in tackling problems in inversion process of shear strength parameters, puts forward a totally new method of back analysis, which is applicable to the shear strength parameters of rock-soils, through the integration of complex-variable-differentiation method, optimization method and elastic-plasticity finite-element method. The method mathematically back calculates shear strength parameters of rock-soils on the basis of displacement of measuring point. The sample calculation result indicates that the method possesses high accuracy and searching efficiency, and is a method of back analysis of displacement deserving popularizing.