北京市某基坑支护设计方案选型分析

Analysis on Type Selection of Support Design Scheme of a Foundation Pit in Beijing

通过基坑周边环境、地质条件等因素,确定基坑的安全等级,选取两种支护方案。利用设计软件进行基坑支护设计,并进一步结合这两种支护方案的工程量和MIDAS GTS NX,分别对桩锚+高压旋喷和SMW工法+锚索这两种支护形式进行二维建模,分析两种模型的桩顶水平位移、周围土体的沉降,在变形相差不大且满足基坑监测范围内选择一个最经济的支护形式,此案例的支护形式选型可以为类似的支护案例提供宝贵经验。

Based on the surrounding environment and geological conditions of the foundation pit,the safety level of the foundation pit is determined,and two support schemes are selected.Use design software to design foundation pit support for this case,and further combine the engineering quantities of these two support schemes and MIDAS GTS NX to carry out the two support forms of pile anchor and high pressure rotary jetting and SMW construction method and anchor cable respectively.Two-dimensional modeling,analyze the horizontal displacement of the pile top and the settlement of the surrounding soil of the two models,select the most economical support form within the deformation difference and meet the monitoring range of the foundation pit.The support form selection in this case Can provide valuable experience for similar support cases.