【摘要】 膨胀土作为"工程中的癌症"在我国分布广泛,为有效评估施工过程中膨胀土堑坡的稳定性状况,基于广西、云南、河南、北京等地22条公路膨胀土路段的调研数据,分析膨胀土堑坡的孕险环境、施工期的致险因子及工后动态反馈信息,遴选出主控膨胀土堑坡稳定性的二级8类24项评价指标。通过统计与理论分析相结合,确立各评定指标的分级标准,并采用层次分析法确定指标权重。基于模糊层次分析法(Fuzzy-AHP)计算各指标相对隶属度向量,最终建立膨胀土堑坡稳定性的动态风险评估模型。针对南友路膨胀土堑坡工程,采用所建评估模型分别进行施工前孕险环境评估与施工期及工后致险因子动态评估,与现场工况的对比分析表明,评估结果与堑坡实际工况吻合性较好,验证了该理论与模型的合理性及实用性,为整个施工过程中膨胀土堑坡稳定性等级动态定量识别提供了一种有效的方法和途径。更多还原

【Abstract】 As "the cancer of the engineering", expansive soil is widely distributed in China. To systematically evaluate the risk grade of expansive soil cut slope stability during construction, based on research results of 22 expansive soil road sections constructed in Guangxi, Yunnan, Henan, Beijing of China, the risk surroundings, factors and feedback information of risk management are analyzed; and the hierarchy model is established consisting of two indexes layer with 8 main evaluation indices. Grading standard of evaluation indices are established by statistics and theoretical analysis; and the weights of evaluation indices are obtained by using analytic hierarchy process. The dynamic recognition model of expansive soil cut slope stability is eventually established by using fuzzy recognition theory and analytic hierarchy process(FAHP). The preliminary assessment of risk surroundings and secondary dynamic assessment of risk factors and feedback information of expansive soil cut slope of Nanyou road was carried out by using the established model; and then the calculated results are compared with field situation. The results indicate that the assessment results are basically in a good agreement with the observed results, so as to verify the rationality and practicability of the proposed model. The dynamic risk assessment methodology and model can provide a powerful tool for quantitative assessment of expansive soil cut slopes stability during the whole construction process.更多还原