【摘要】 该文分别采用ＪＣ法以及Ｍｏｎｔｅ—Ｃａｒｌｏ方法中的随机投点法和重要抽样法来计算地基承载力失效概率和可靠度指标，结果表明采用改进的搜索适应重要抽样法具有很大的优越性。一方面，它能适应极限状态方程的非线性以及随机变量的非正态，另一方面，它克服了随机投点方法的突出缺点，减少了模拟计算次数，提高了抽样效率和计算精度。更多还原

【Abstract】 In this paper, JC method, random throwing - dot method and the importance sampling method of Monte - Carlo Method are adopted to calculate the failure probability and the reliability index of foundation bearing capacity. The result shows that the use of the improved searching adaptive sampling method has great superiority. On the one hand, it can be adapted to the nonlinearity of limit slate functions and non - normality of random variables; on the other band, it can overcome the prominent drawback of random throwing - dot method, decrease the number of times of simulation calculation and enhance the sampling efficiency abed precision of calculation.更多还原