大直径灌注桩钻孔开挖引起的地层应力和应变变化规律  

Changes in ground stress and strain caused by drilling and excavation of large-diameter cast-in-place piles

作　　者：孙寒星 Sun Hanxing(China Railway 24th Bureau Group Anhui Engineering Co.,Ltd.,Hefei Anhui 230011,China)

机构地区：[1]中铁二十四局集团安徽工程有限公司,安徽合肥230011

出　　处：《山西建筑》2025年第8期79-82,93,共5页Shanxi Architecture

基　　金：安徽省公益性地质工作项目(项目编号:2015-g-13)。

摘　　要：对某立交桥工程中大直径灌注桩的开挖过程进行数值模拟,研究不同开挖深度下土层的应力、变形等参数的变化,通过对比实测值与模拟结果,对数值模型进行优化,采用优化后模型分析开挖深度、孔壁材料等因素对开挖过程中孔壁稳定性的影响。研究结果表明:在开挖面附近出现应力集中现象,开挖深度的增加导致应力水平不断增大,并且达西流速、流场压力的分布发生明显的变化;在开挖面附近出现了少量的塑性变形,塑性变形的区域随开挖的进行逐渐增大。The excavation process of large-diameter bored piles in a certain interchange bridge project is numerically simulated to investigate the variation of parameters such as stress and deformation in the soil layers under different excavation depths.By comparing the measured values with the simulation results,the numerical model is optimized.The optimized model is then used to analyze the impact of excavation depth,borehole wall materials,and other factors on the stability of the borehole wall during excavation.The results indicate that stress concentration occurs near the excavation surface,and as the excavation depth increases,the stress level continues to rise.Additionally,the distribution of Darcy velocity and flow pressure undergoes significant changes.A small amount of plastic deformation appears near the excavation surface,and the area of plastic deformation gradually expands as the excavation progresses.

关 键 词：大直径灌注桩 钻孔开挖 数值模拟 应力 应变 

分 类 号：TU411[建筑科学—岩土工程]