深回填土地层电力竖井注浆围护方案研究

A Study on the Scheme of Grouting and Enclosure for the Power Shaft in the Deep Backfill Soil Layer

以深回填土地层电力工程为背景,采用midas GTS NX有限元分析软件对真实施工过程进行数值模拟,对比分析注浆加固围护方案与非加固方案情况下,竖井基坑土体形变和支护结构应力的规律,得出注浆加固围护方案对基坑支护具有积极影响效果;通过分别建立二维及三维数值模型并分析,得出在尺寸及空间效应的影响下,电力竖井基坑二维分析与三维分析结论差异较大的结论;对模拟结果与现场测量数据进行对比分析,验证了数值模拟与现场实际情况的一致性,可为类似项目提供借鉴。

Based on the power project in the deep backfill soil layer,this paper introduces the numerical simulation of the real process of construction by means of the Midas GTS NX finite element analysis software.The deformation law of the soil mass and the stress of the supporting structure of the foundation pit of the shaft are compared and analyzed with and without the scheme of grouting and reinforcement enclosure.It is concluded that the scheme has a positive influence on the support of the foundation pit.The establishment of two-dimensional and three-dimensional numerical models and related analyses show that the results of two-dimensional and three-dimensional analyses of the foundation pit of the power shaft are quite different influenced by the size and space effects.The contrastive analysis between the results of simulation and the field measurement data verifies the consistency between the numerical simulation and the actual situation,which can provide reference for similar projects.