某水利工程闸门基坑开挖对邻近既有隧道变形影响  

Impact of Pit Excavation on Deformation of Adjacent Existing Tunnels

作　　者：蔺小兵 Lin Xiaobing(Baiyang River System Management Office,Yumen City,Jiuquan City,Gansu Province,Yumen 735200,Gansu)

机构地区：[1]甘肃省酒泉市玉门市白杨河系管理所,甘肃玉门735200

出　　处：《陕西水利》2022年第9期13-15,共3页Shaanxi Water Resources

基　　金：酒泉市玉门市白杨河系管理所基金项目(jqbyh2022-01)。

摘　　要：基坑开挖活动必然对周围地层造成扰动,破坏其原有结构,这就会对相邻隧道的荷载和变形产生严重的影响。本文以某水利工程闸门基坑工程为例,从隧道位置和基坑开挖面尺寸这两个方面深入分析了隧道荷载受到的影响,研究结果表明:当隧道和基坑越近时,水平附加荷载呈现出以稳定速度增加的趋势;竖向荷载的变化规律在范围[-12 m,12 m]里呈现为随着最小净距的增大,竖向荷载变化曲线逐渐从“M型”变成了“单顶点凹曲线”;隧道受到的附加荷载不会因深度h的变化而出现较大的改变;竖向、水平附加荷载的大小因为深度h的变大而降低,大埋深隧道具有保护隧道的作用,但作用较小;作用于隧道上的附加荷载不会因为基坑长度L的变化而发生太大的改变;水平荷载受到宽度B的影响程度较大。The excavation activity of the foundation pit is bound to disturb the surrounding strata and destroy its original structure, which will have a serious impact on the load and deformation of the adjacent tunnel. This paper takes a pit project as an example, and analyzes in depth the influence of tunnel loads from two aspects: the tunnel location and pit excavation surface size, and the results show that: when the tunnel and pit are closer, the horizontal additional load shows a trend of increasing at a steady rate;the vertical load changes in the range [-12 m, 12 m] as the minimum clear distance increases, the vertical load changes gradually from "M-shaped" to "single-vertex concave curve";the additional load on the tunnel does not change significantly due to the change in depth h;the magnitude of the vertical and horizontal additional load decreases due to the increase in depth h. The large buried tunnel has a protective effect on the tunnel, but the effect is small;the effect on the tunnel is small. But the role is smaller;the additional load acting on the tunnel does not change much because of the change of the length L of the pit;the horizontal load is affected by the width B to a greater extent.

关 键 词：深覆盖层 土石坝 变形 应力 

分 类 号：TV663[水利工程—水利水电工程]