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双重置换管幕工法在大断面穿越工程中能有效控制施工期间的地面沉降,减小对地面交通的影响,有利于城市环境的保护。为研究该工法的可行性,本文针对工具式钢管顶推开挖土体和箱涵置换钢管推进施工两个工况进行了三维数值模拟。重点讨论该工法施工引起的路基地表沉降变形特征和规律。计算结果表明,理想状态下数值模拟结果较好地反映了实际工程中观测点的沉降变化情况,表明计算模型是可靠的。根据实测数据分析,地表最大沉降基本控制在30 mm以内,能满足规定的地表沉降要求,表明采用双重置换管幕工法是合理可行的。
The double displacement pipe curtain method can effectively control the land subsidence during the construction period and reduce the impact on the ground traffic during the large cross-section crossing project, which is in favor of the urban environment protection. In order to study the feasibility of the method, three-dimensional numerical simulation is carried out for two conditions of tool-type steel tube jacking excavation and box culvert replacement steel tube pushing construction. This paper mainly discusses the deformation characteristics and regularities of subsidence caused by the construction method. The calculation results show that the numerical simulation results in the ideal state can better reflect the settlement changes of the observation points in the actual project, indicating that the calculation model is reliable. According to the measured data analysis, the maximum surface subsidence is controlled within 30 mm, which can meet the required surface subsidence requirements. It shows that it is reasonable and feasible to adopt double displacement pipe curtain method.