膨胀土地层深基坑变形分析及控制

Deformation analysis and control of deep foundation pit in expansive soil layers

在膨胀土地层的深基坑施工,采集围护结构变形情况的监测数据,能分析出变化量最大部位在时间和空间上的分布,再结合施工步序,提前采取相应措施,或者优化开挖工序,指导施工。本文以某车站深基坑监测为例,对膨胀土地层深基坑的围护结构变形情况进行分析,阐述监测数据的变形规律,总结施工过程中各项变形控制措施的有效性。可以有效地避免膨胀土地层对围护桩变形产生的不利影响,保证了基坑施工安全。通过总结膨胀土地层对基坑开挖各个时期的影响情况,提出合理化的控制措施和实用建议,为相关地区类似项目开展提供参考。

In the construction of deep foundation pit in expansive soil layers,the distribution of the parts with the maximum variation in time and space can be analyzed by collecting the monitoring data of the deformation of the envelope structure.Then,combined with the construction sequence,the corresponding measures can be taken in advance,or the excavation process can be optimized to guide the construction.Taking the monitoring of deep foundation pit in a station as an example,this paper analyzed the deformation of the envelop structure of deep foundation pit in expansive soil layers.In this paper,the deformation rule of monitoring data was expounded,and the effectiveness of various deformation control measures in the construction process was summarized.By doing so,the adverse effect of expansive soil layers on the deformation of the retaining pile can be avoided effectively,which ensures the safety of foundation pit construction.By summarizing the influence of expansive soil layers on each stage of foundation pit excavation,reasonable control measures and practical suggestions are put forward to provide references for similar projects in related areas.