摘要
针对城市建成区内小型泵闸基坑工程工期较短、深度较大、变形控制严格的特点,双排拉森桩围护结构因其工序简单、挡土高度大、变形控制好等特点而得到了一定的应用。根据实际工程案例,采用理正深基坑软件双排桩支护模块进行基坑安全分析,选取不同杂填土的土层参数预测桩顶最大位移值与地表沉降值,将预测值与监测值对比分析,检验在上海软土地区中双排拉森支护的计算方法和计算参数的合理性。当杂填土厚度较厚且以黏性土为主时,采用水土合算及其对应的土层参数进行模拟,桩顶最大位移和地表沉降更符合监测结果。
Aiming at the characteristics of short construction period, large depth and strict deformation control of small pump sluice foundation pits in urban built-up areas, the double-row Larsen pile retaining structure has been applied to some extent because of its simple procedures, large retaining height, good deformation control and other characteristics. According to an actual engineering case, the Lizheng deep foundation pit software double-row pile support module is used to conduct the safety analysis of foundation pit. The soil layer parameters of different miscellaneous fillings are selected to predict the maximum displacement value of pile top and the surface settlement. The predicted values and monitored values are compared and analyzed to verify the rationality of the calculation method and calculation parameters of double-row Larson support in the soft soil area of Shanghai. When the thickness of miscellaneous backfill is thick and the cohesive soil is the main, the soil-water integration and its corresponding soil layer parameters are used for simulation. The maximum displacement of the pile top and the surface settlement are more in line with the monitoring results.
出处
《城市道桥与防洪》
2020年第7期274-277,M0025,共5页
Urban Roads Bridges & Flood Control
关键词
软土地区
基坑
双排拉森钢板桩
土压力计算
土层参数选取
soft soil area
foundation pit
double-row Larson steel sheet pile
earth pressure calculation
selection of soil layer parameters
