承压水地层地下连续墙成槽施工稳定性研究

Study on the construction stability of grooved underground continuous wall in confined water strata

利用数值模拟,分析了不同承压水条件下及不同泥浆重度条件下的地下连续墙槽壁变形及地面沉降变形规律,主要得到以下结论:地下连续墙槽壁变形与土体性质密切相关,由于槽段中部为卵石圆砾地层,土体抗变形能力较大,因此该部位变形较小,槽壁变形沿深度呈“M形”.承压水的存在是造成槽壁变形及地面沉降过大的重要原因,对地面沉降、槽壁变形及稳定均有较大影响.泥浆重度越大越有助于槽壁稳定.但鉴于后期混凝土浇筑的施工因素,建议泥浆比重选定在10.4~11.5 kN/m3区间.

Using numerical simulation,the deformation law of the groove of underground diaphragm wall and ground subsidence de⁃formation under different confined water conditions and different mud severities were analyzed.The main conclusions are as follows:the deformation of the groove of underground diaphragm wall is closely related to soil properties.The middle part of the trough section is a pebble and round gravel stratum,and the soil body has a large resistance to deformation,so the deformation of this part is small,and the deformation of the trough wall is that of“M⁃shaped”along the depth.The existence of confined water is an important reason to the deformation of the tank wall and the excessive ground settlement,and has a great impact on the ground settlement,the deformation and stability of the tank wall.The increase in the mud weight can improve the stability of the groove wall.But in view of the construction factors of the later concrete pouring,it is recommended that the specific gravity of the mud should be selected in the range of 10.4-11.5 kN/m3.