摘要
随着城市建设的发展,隧道下穿管线以及建(构)筑物基础事故案例逐渐增多,由隧道施工引起的地层沉降问题日益受到重视。针对这一问题,本文基于室内大型模型试验,以干砂为填料,通过调整模型箱底部沉降条的沉降量模拟了隧道施工过程中地层的沉降。分析了对不同深度土体沉降量、地层损失量,研究不同深度土层沉降规律以及地层损失量变化特征。试验结果表明,沉降槽宽度系数与土层埋深之间具有较好的线性关系;不同深度土层的沉降槽体积不是一个常数,与中心最大沉降量Smax以及沉降槽宽度系数i有直接关系;地层损失量受沉降发展程度、埋深等因素影响。
Rapid development in congested urban cities requires efficient use of underground space by all kinds of means,such as tunnelling. In recent years,many pipelines and underground structures are damaged by underneath tunnel excavations,so special attention should be paid to ground movement induced by these construction activities. In this study,full-scale model lab experiments are carried out in dry sand to investigate tunnelling-induced ground movements. By adjusting settlement plates placed at the bottom of model box,effects of tunnel excavation are simulated.Variations of subsurface soil settlement and volume loss with soil depth are studied. A linear relationship between the distance from tunnel centerline to the inflection point of settlement trough( i) and soil depth is observed from the test results. Volume of settlement at different soil depths varies with the maximum settlement( Smax) and the distance from tunnel centerline to the inflection point of settlement trough( i). Ground loss is affected by the progression of settlement,the depth and other factors.
出处
《土木工程学报》
EI
CSCD
北大核心
2014年第5期133-139,共7页
China Civil Engineering Journal
基金
国家自然科学基金(51278099)
