改进的容重增加法原理及离心模型试验数值模拟

容重增加法作为一种边坡稳定分析方法本身具有一定的缺陷,计算结果常常偏差较大,甚至可能无法得出结果。针对容重增加法的缺陷,定量分析了容重增加法的误差来源,并通过公式推导对改进容重增加法的原理进行了分析。针对改进的容重增加法,设计了不同参数的边坡模型,将容重增加法、强度折减法与改进的容重增加法进行对比分析,研究改进方法的改进效果。然后,利用ACADS边坡稳定分析例题,验证了改进方法在非均质边坡中的应用效果。最后,将改进前后的容重增加法运用到土工离心模型试验的结果分析中,并将试验结果与模拟结果进行对比分析,验证了用改进的容重增加法分析离心模型试验结果的可行性。本文的研究为容重增加法改进方法的应用提供了理论依据,并为土工离心模型试验的相关分析提供了参考。

Research on the principle of the modified gravity increase method and its application on the numerical simulation of centrifugal model test

The gravity increase method has an inherent shortcoming that may result in a wrong safety value of the factor of safety or even fail to give an answer.In this study,the error source of the gravity increase method was quantitatively analyzed.The modified gravity increase method,was theoretically studied through mathematical derivation.The improvement of the modified gravity increase method was studied by applying the gravity increase method,strength reduction method,and the modified gravity increase method to slope models with different parameters.ACADS example was also introduced to prove that the modified gravity method was suitable for heterogeneous slopes.Moreover,a centrifuge model test was numerically analyzed using the modified and the non-modified gravity increase methods.By comparing the test data and calculation results,applicability of the modified gravity increase method in the simulation of centrifuge model tests was verified.Research of this paper will provide a theoretical basis for the use of the modified gravity increase method and also provide reference for relevant studies of the analysis of centrifuge model tests.