深基坑开挖对邻近通道影响的实测及数值分析  

Field measurement and numerical analysis on effects of deep excavation on adjacent channel

作　　者：姜兆华[1,2] 张永兴[1,2] 

机构地区：[1]重庆大学土木工程学院,重庆400030 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400030

出　　处：《西北农林科技大学学报（自然科学版）》2013年第4期220-226,共7页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家自然科学基金项目(51027004)

摘　　要：【目的】研究基坑开挖对邻近通道的影响,为邻近通道基坑开挖工程的设计与施工提供参考。【方法】以重庆某周围存在邻近人防洞通道的岩质深基坑工程为例,通过数值模拟和现场观测,研究土岩组合地层基坑与通道变形、通道拱脚推力及围岩破坏模式的关系。【结果】邻近通道会改变地表最大沉降点位置,土岩组合地层中地表沉降主要与基坑的水平位移和通道沉降有关。通道与基坑之间围岩间壁厚度较大时,隧洞破坏来自于拱顶;间壁厚度较小时,隧洞破坏来自于侧壁。由于受连续介质及隧道几何形态的影响,围岩会改变位移场传递的方向,通道主要表现为横向变形。【结论】邻近通道会增加基坑的水平位移与沉降,通道的破坏方式与间壁岩体厚度有关。[Objective] This study focused on the effects of excavation foundation pit on adjacent channels and aimed to improve the design and construction of the foundation pit. [Method] Based on the rock deep excavation adjacent to the channel in Chongqing,the deformation of the channel and deep foundation pit,thrust at springer, and the surrounding rock failure mode were studied by numerical simulation and field measurement in the soil rock layer. [Result] The results showed that the adjacent channel changed the position of the biggest settlement point, and the ground surface settlement was related to the horizontal displacement and the settlement of the channel in soil rock layer. When the thickness of the surrounding rock was larger, the tunnel vault may appear tension failure. If the thickness of the surrounding rock was smaller, the lateral wall may appear tension failure. Due to the influence of the continuous media and tunnel geometric shape,the surrounding rock would change the direction of displacement field and cause the lateral deformation. [Conclusion] Adjacent channel will increase the horizontal displacement and settlement of the foundation pit, and the failure mode is related to the thickness of the rock mass.

关 键 词：邻近通道 深基坑 数值模拟 拉裂破坏 变形监测 

分 类 号：TU433[建筑科学—岩土工程]