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提出用有限元法反算滑带土抗剪强度指标的新方法,并应用于受地下水和库水位影响的复杂条件下某古滑坡体的强度指标反算。为便于比较,基于传统反算法的基本原理,采用重度替代法建立了相应条件下包括传递系数法在内的滑带土综合抗剪强度指标反算的理论公式。实例计算结果表明,有限元反算法克服了传统的极限平衡理论反算法的缺点,所得结果更加合理、可靠。
A new method of backcalculating the shear strength index of slip zone soil with finite element method is proposed and applied to the back calculation of the strength index of an ancient landslide body under complex conditions affected by groundwater and reservoir water level. In order to facilitate the comparison, based on the basic principle of traditional inverse algorithm, a theoretical formula of backcalculation of comprehensive shear strength index of sliding zone soil including transfer coefficient method under corresponding conditions was established by using the method of severe substitution. The calculation results show that the inverse finite element method overcomes the shortcomings of the traditional limit equilibrium theory inverse algorithm, and the result is more reasonable and reliable.