复杂深基坑支护设计分析及稳定性评价

为确保基坑安全施工,结合基坑所处地质条件、近接条件,先开展基坑支护设计分析,并通过规范公式计算、变形预测等开展基坑稳定性评价。分析结果表明,复杂地质条件、近接条件下的基坑支护设计分析是必要的,结合工程实际,将此文实例基坑的支护形式设计为“支护桩+两道锚杆”;同时,经基坑支护处理,基坑稳定性系数、抗隆起系数均大于规范相应限值,因此,支护体系满足规范稳定性及抗隆起要求,且变形预测显示其变形趋于稳定,变形预测值介于19.68~22.34 mm,小于变形控制值,说明基坑在后续一段时间内的稳定性较好,基坑支护结构的运营条件较好。

In order to ensure the safe construction of the foundation pit,based on the geological conditions and proximity conditions of the foundation pit,the foundation pit support design analysis is carried out first,and the foundation pit stability evaluation is carried out through standard formula calculation and deformation prediction.The analysis results show that:It is necessary to analyze the design of foundation pit support under complex geological conditions and proximity conditions.Combined with the actual engineering,the support form of foundation pit in this example is designed as"support pile+two anchor rods";At the same time,after foundation pit support treatment,the stability coefficient and anti-uplift coefficient of the foundation pit are greater than the corresponding limit values of the specification.Therefore,the support system meets the stability and anti-uplift requirements of the specification,and the deformation prediction shows that its deformation tends to be stable.The deformation prediction value is between 19.68 and 22.34 mm,which is less than the deformation control value,indicating that the stability of the foundation pit is good in the subsequent period of time and the operating conditions of the foundation pit support structure are good.