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针对边坡安全系数是隐式函数的特点,提出将有限差分强度折减法和响应面法(RSM)相结合,分析边坡可靠性的方法。采用安全系数、破坏概率及对应的临界滑动面等,作为综合评价边坡稳定性的指标。算例验证表明,笔者提出的计算方法所得结果与其他方法比较接近,且更能反映边坡真实的工作状态。对某钢铁基地工程的昔格达组地层边坡,采用新的计算方法进行可靠度分析,对比研究确定性破坏模式和概率破坏模式中剪应变增量和破坏区的分布。研究结果表明,均值强度较高的边坡岩土体,如果变异系数较大,便仍处于较高风险水平,虽然边坡整体的安全系数满足工程要求;均值安全系数和最小可靠度指标对应的破坏模式也是有差别的。
Aiming at the characteristic that the slope safety factor is an implicit function, a method of combining the finite difference strength reduction method with the response surface method (RSM) is proposed to analyze the slope reliability. The safety factor, probability of failure and the corresponding critical slip surface are used as indexes to evaluate the slope stability. The example verification shows that the calculation results obtained by the author are close to other methods and can better reflect the real working condition of the slope. Based on the reliability analysis of the Xigeda Formation strata slope in a steel base project, a new calculation method was used to analyze the distribution of shear strain increment and failure zone in the deterministic failure mode and the probability failure mode. The results show that the slope rock and soil with higher mean strength are still at a higher risk level if the coefficient of variation is larger, although the overall safety factor of the slope meets the engineering requirements. The average safety factor and the minimum reliability index correspond to Disruption patterns are also different.