基坑失稳分析及施工中若干问题的思考

由于基坑施工时对某些关键部位和工艺如锚索成孔、注浆、张拉以及泄水孔的控制不严引发基坑失稳的事故越来越多，对基坑失稳的影响因素进行了分析。针对长沙地区的地层分布特点，介绍了基坑施工中容易忽视的问题，对帷幕的可行性和必要性进行初步分析，同时对含水层中锚索采用压力循环注浆工艺进行了总结。

Analysis on Foundation Excavation Instability and Some Problems in Construction

Accidents happen a lot in excavation engineering because some key processes, such as anchoring boring, grouting, tension and draining hole, are not strictly controlled. Based on the analysis on the influencing factors of excavation instability and according to the stratum distribution characters in Changsha, introduction was made in the problems easily neg- lected in excavation construction and preliminary analysis was made on the feasibility and necessity of waterproof curtain. The paper summed up construction technology of pressure cycle grouting of anchor cable in aquifer.