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将幂律型广义非线性强度准则应用到土工结构安全系数计算中,令土体强度逐渐降低,直至结构破坏,得到最终的安全系数,并开发了基于幂律型广义非线性强度准则的有限元强度折减法程序。该方法不需事先假设滑裂面,计算方便可靠,能适用于各种复杂地质条件。作为算例,该文分别采用线性和非线性两套指标计算了一常见高土石坝和一机场高填方边坡的安全系数。在线性指标下该文方法与PLAXIS内置有限元强度折减法计算结果一致,相对非线性指标,线性指标计算的滑裂面偏浅,计算的安全系数大小随线性参数的确定方法不同而不同。建议使用非线性强度指标计算高围压下土工结构的安全系数。
The power law generalized nonlinear strength criterion is applied to the calculation of the geotechnical structural safety factor, the soil strength is gradually reduced until the structure is destroyed, the final safety factor is obtained, and the finite element method based on the power law generalized nonlinear strength criterion Strength reduction method procedure. The method does not need to presume the slip surface in advance, and is convenient and reliable in calculation, and can be applied to various complicated geological conditions. As an example, this paper calculates the safety factor of a common high earth-rockfill dam and an airport high-fill slope by using two sets of linear and nonlinear indexes respectively. Under the linear index, the proposed method is consistent with the PLAXIS built-in finite element strength reduction method. The relative nonlinear index and the linear index calculate the sliding surface shallow, and the calculated safety factor varies with the linear parameter. It is recommended to calculate the safety factor of geotechnical structures under high confining pressure using nonlinear strength index.