地下连续墙成槽施工参数对槽壁稳定的影响研究

 以宁波地铁1号线鼓楼站与东门口站地下连续墙成槽施工为背景，通过分析成槽施工参数对连续墙充盈系数的影响，研究软土地层连续墙槽壁稳定的影响因素，并结合对连续墙槽壁的超声波检测记录以及统计连续墙混凝土浇筑过程中混凝土液面的上升速率分析槽壁坍塌的位置。结果表明，成槽速度和混凝土浇筑速度对槽壁稳定性有一定影响；泥浆质量和液面高度符合设计要求时，成槽施工顺序和槽深对槽壁稳定性影响较小；槽壁坍塌主要集中在导墙以下5m范围内及含黏性土粉砂层中。

ANALYSIS OF STABILITY OF SLURRY TRENCH SIDES OF DIAPHRAGM WALL BASED ON CONSTRUCTION PARAMETERS

Based on the diaphragm wall construction of two open-cut metro stations，we study the influence factors of stability of slurry trench sides during diaphragm wall building in soft soil by analyzing the fullness coefficient of slurry trenches corresponding to different controlling parameters. This paper also makes an analysis of distortion position of slurry trench sides by combining ultrasonic test records with concrete rising rate of diaphragm wall in the process of concreting. The analytic result shows that the rates of trench construction and perfusion have impact on the stability of slurry trench sides，yet the construction sequence and the groove depth have little effect on the stability of slurry trench sides if both the quality and the level height of slurry meet the design requirements. The deformation of slurry trench sides mainly happens within the region of 5 m below the guide wall and in the silt sand with clayey soil.