摘要
浅埋暗挖施工诱发地表塌陷的发生机理和极限状态下的破坏模式尚不清楚。针对这一研究现状,利用基于粒子图像测速技术(particle image velocimetry, PIV)的缩尺模型试验,模拟砂土和Ⅴ级围岩中浅埋隧道的暗挖施工过程并利用PIV技术对暗挖隧道施工过程中围岩变形的图片进行分析,获得暗挖施工扰动诱发地层变形的位移云图。通过分析暗挖施工扰动诱发地表变形特征和渐进演变规律,总结极限状态下不同地层中暗挖隧道施工诱发地表塌陷的破坏面形状和塌陷范围。利用极限分析上限定理和变分原理推导得到暗挖施工诱发拱顶地层塌陷的破坏面方程并绘制出塌落面图形。将模型试验得到的暗挖施工诱发拱顶地层塌陷的范围与理论计算结果进行对比,验证了本研究模型试验结果的有效性。
The mechanism of surface subsidence induced by shallow buried excavation construction and the failure mode under ultimate state were not unclear.In view of this situation,a scaled model experiment based on particle image velocimetry(PIV)was conducted to simulate the construction process of shallow buried tunnels in sandy soil and Ⅴ-grade surrounding rock.PIV technology was used to analyze the deformation images of the surrounding rock during the construction process of the tunnel,and to obtain displacement cloud maps of geological deformation induced by construction disturbance.By analyzing the characteristics and gradual evolution of surface deformation induced by underground excavation construction disturbance,the shape and range of the failure surface and collapse induced by underground excavation tunnel construction in different strata under the limit state were summarized.The equation of the failure surface induced by the collapse of the arch top strata during underground excavation construction was derived by using the upper limit theorem of limit analysis and variational principle,and the collapse surface graph was drawn.The validity of the model test results was verified by comparing the range of collapse induced by underground excavation construction in the arch crown strata obtained from the model test with the theoretical calculation results.
作者
黄阜
申勇斌
张敏
王勇涛
杨云强
朱睿
HUANG Fu;SHEN Yongbin;ZHANG Min;WANG Yongtao;YANG Yunqiang;ZHU Rui(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan,China)
出处
《隧道与地下工程灾害防治》
2024年第3期12-21,共10页
Hazard Control in Tunnelling and Underground Engineering
基金
国家自然科学基金面上资助项目(52278395)
关键词
浅埋暗挖
模型试验
PIV技术
地表塌陷
对比验证
underground excavation
model test
PIV technique
surface collapse
comparison validation
