基于模糊综合评价和数值模拟方法的石浦港岸坡稳定性分析

Stability Analysis of Shipu Port Bank Slope Based on Fuzzy Comprehensive Evaluation and Numerical Simulation Method

由于影响港岸边坡稳定性的因素较多,且许多因素难以量化,因此分析和评价港岸边坡稳定性一直是个难点。为查明石浦港岸坡稳定性,基于现场地质调查情况,选取岸坡坡度、地层岩性、岸线类型、波浪作用、人类工程活动5个评价指标,构建评价指标体系,分别采用模糊综合评价法和数值计算法对石浦港岸坡进行稳定性分析。结果表明,石浦港岸坡19个研究区块,其中有7个稳定性相对较差,主要分布于港区水下岸坡坡度较大,软土厚度较厚岸段,评价结果与实际情况较为吻合;石浦港岸坡部分岸段的数值计算结果与模糊综合评价结果一致,表明模糊综合评判方法的可行性和合理性。该研究对于港口边坡稳定性评价、灾害预测预报及后续工程治理具有一定的参考价值。

It is always difficult to analyze and evaluate the stability of port bank slope because the stability of port bank slope is affected by many factors which are difficult to quantify.In order to find out the stability of the bank slope of Shipu Port,based on the on-site geological investigation,5 evaluation indicators,namely slope gradient,stratum lithology,shoreline type,wave action,and human engineering activities,were selected to construct an evaluation index system.The fuzzy comprehensive evaluation and numerical simulation method were adopted respectively.The results show that among the 19 research blocks of Shipu Port bank slope,7 of them have relatively poor stability,which are mainly distributed in the underwater bank section of the port area with large slope and thick soft soil thickness.The evaluation results are in good agreement with the actual situation.The numerical simulation results of some sections of Shipu Port bank slope are consistent with the fuzzy comprehensive evaluation results,indicating the feasibility and rationality of the fuzzy comprehensive evaluation method.The study has certain reference value for port slope stability evaluation,disaster prediction and subsequent engineering treatment.