土岩复合地层深基坑变形时空效应分析

地铁车站深基坑施工难度大,自身变形风险高,受扰动的周边地表沉降风险和建筑物破坏风险突出,而基坑变形的时空效应又是识别和控制上述风险的基础信息数据。为此,以某市地铁车站深基坑工程施工为例,研究土岩复合地层深基坑变形时空效应的特征与规律,为控制基坑自身风险和周边环境风险提供依据。首先,分析该基坑的地质条件及其土岩复合地层条件下的基坑变形模式;然后,利用Midas GTS NX有限元模拟软件,对该基坑土方开挖进行模拟,利用模拟位移云图描绘该基坑变形的动态演变过程和时空效应特殊性;利用现场监测数据分析和验证数值模拟结果,进一步总结和分析土岩复合地层深基坑变形时空效应的特殊性。

Analysis of space-time effect of deep foundation pit deformation in soil-rock composite stratum

The construction of deep foundation pit in metro station is difficult, its deformation risk is high. Surface settlement risk and building damage risk are prominent due to disturbance. The space-time effect of foundation pit deformation is the basic information data for identifying and controlling the above risks. Therefore, taking the construction of deep foundation pit of a metro station in a city as an example, this paper studies the characteristics and rules of the time-space effect of deformation of deep foundation pit in soil-rock composite stratum, and provides the basis for controlling the risk of the foundation pit itself and the surrounding environment. First, the base is analyzed. The geological conditions of the pit and the deformation model of the foundation pit under the soil and rock composite strata; Then, the earth excavation of the foundation pit is simulated by using Midas GTS NX finite element simulation software, the dynamic evolution process of the foundation pit deformation and the particularity of the space-time effect are described by using the simulated displacement cloud map. Based on the field monitoring data and verification of numerical simulation results, the particularity of space-time effect of deep foundation pit deformation in soil-rock composite strata is further summarized and analyzed. This paper has important guiding significance for the construction risk control of foundation pit under similar conditions.