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为了综合评价盾构下穿危旧房屋及河流段风险,结合软土土质特点,在对已有评价模型分析的基础上,针对风险评价普遍存在的问题,借鉴突变理论,确定盾构施工风险突变评价法步骤,将各因素归纳为工程地质、勘察设计施工、周边环境和水文地质四大指标,并对其进行分解,构建风险评价指标体系及等级标准,利用突变理论对工程实例进行评价,得到该区间盾构施工风险等级为极高风险,评估的结果较好地反映了工程的实际情况。基于风险评价结果,在盾构下穿过程,采取合理设定土压力、调节盾构推进速度和注浆压力等措施,实时动态监控地表沉降的变化和盾构施工关键参数,所得成果验证了突变理论风险评价的实用性和有效性。
In order to synthetically appraise the risk of dangerous buildings and rivers under the shield, combined with the characteristics of soft soil, based on the analysis of existing evaluation models, aiming at the ubiquitous problems of risk assessment and using the theory of mutation, Evaluation method steps, the factors are summarized as four major indicators of engineering geology, survey and design, surrounding environment and hydrogeology, and decomposition, to build risk assessment index system and grade standards, the use of catastrophe theory to evaluate the project instance, we can get The risk level of shield construction in this interval is extremely high risk, and the result of evaluation better reflects the actual situation of the project. Based on the results of the risk assessment, measures such as setting the earth pressure properly, adjusting the advancing speed of the shield and grouting pressure, etc., are carried out under the shield to monitor the change of the ground settlement and the key parameters of the shield construction in real time. The obtained results verify that the mutation Practicality and validity of theoretical risk assessment.