邻近挡土结构隧道开挖引起地层变形的试验研究  

Experimental Study on Ground Deformation Caused by Tunnel Excavation with Adjacent Retaining Structure

作　　者：高泉平 杨硕 芮瑞 张泉[1] 聂利文 孙天健 GAO Quan-ping;YANG Shuo;RUI Rui;ZHANG Quan;NIE Li-wen;SUN Tian-jian(Capital Construction Division,Wuhan University of Technology,Wuhan 430070,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学基建处,武汉430070 [2]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《武汉理工大学学报》2023年第9期75-82,共8页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(42272315);国家级大学生创新训练项目(202210497084)。

摘　　要：开发了可视化土工模型试验箱及模拟隧道开挖地层损失的水囊装置,考虑隧道埋深、隧道与挡土结构水平距离及隧道开挖体积损失3个因素开展了多参数影响模型试验,通过粒子图像测速技术获取填料位移,对地层变形、滑移面演化与地表沉降规律进行分析。结果表明:隧道开挖使隧道上方土体形成三角形集中下沉区域,下沉量随隧道开挖地层损失的增大而增大,地层沉降影响区域随隧道埋深的增大而逐渐扩大,当开挖距离较小时,隧道上方两侧地层向挡墙一侧偏移的现象较为显著。随开挖距离增加,隧道靠近挡土墙一侧滑移面角度变化程度不大,远离挡土结构一侧滑移面角度增大。A visual geotechnical model test box with a water bag unit was developed to simulate the ground lost during tunnel excavation.A multi-parameter influence model test was carried out considering three factors,the tunnel buried depth,the horizontal distance between the tunnel and the retaining structure,and the volume loss during tunnel excavation.The fill settlement was obtained through particle image velocimetry technology,and the ground deformation,slip surface evolution and surface settlement laws were analyzed.The results show that the tunnel excavation makes the soil above the tunnel form a triangular concentrated settlement area,the settlement increases with the increase of the tunnel excavation volume loss.The influence area of the ground settlement gradually expands with the increase of the tunnel buried depth.When the excavation distance is small,the ground settlement above the tunnel tends to shift to the retaining wall side significantly.With the increase of excavation distance,the slip surface of the tunnel near the retaining wall changes little,and the slip surface angle of the tunnel away from the retaining structure increases.

关 键 词：隧道 挡土结构 地层变形 土压力分布 滑移面角度 

分 类 号：TU47[建筑科学—结构工程]