基于未确知测度理论的基坑边坡稳定性评价

Stability Evaluation of Foundation Pit Based on Unascertained Measure Theory

影响基坑边坡稳定的不确定性因素较多,如基坑规模、场地岩土体性质、施工质量、环境因素等。为了探索科学合理的基坑边坡的稳定性评价方法,本文基于未确知测度理论,选取了基坑深度、支护方式、主要土层粘聚力、主要土层内摩擦角、地下水及地表水作用、邻近荷载、邻近荷载坑边距、施工质量八个因素作为评价指标,利用三标度法结合层次分析法确定各指标权重,建立基坑边坡稳定性评价模型。将此模型应用于两个基坑工程实例,对比实际监测结果,评价结果的可靠度较高。结果表明,基于未确知测度理论的基坑边坡稳定性评价模型具有可行性。

There are many uncertainties affecting the stability of the foundation pit,such as the size of the foundation pit,the soil properties of the site,construction quality,and environmental factors. In order to explore a scientific and rational method for evaluating the stability of foundation pit slopes, based on the unascertained measure theory,this paper selects the depth of foundation pits,supporting methods,main soil layer cohesion,main soil internal friction angle,groundwater and surface,water effect,adjacent load,adjacent load pit margin,and construction quality as evaluation indicators. The weight of each index is determined by using the three-scale method combined with the analytic hierarchy process.The stability evaluation model of the foundation pit is established. This model is applied to two examples of foundation pit engineering. Compared with actual monitoring results,the reliability of evaluation results is credible. The results show that the foundation slope stability evaluation model based on unascertained measurement theory is feasible.