水资源与水工程学报2017，Vol.28Issue(1)：214-219,6.DOI:10.11705/j.issn.1672-643X.2017.01.38
盾构隧道施工期间土体沉降计算分析
Analysis of soil settlement calculation during the construction of shield tunnel
摘要
Abstract
The indoor dynamic triaxial tests were conducted for remodeling gravelly clay saturated gravelly clay comprehensively considering of the cumulative plastic deformation model and circulation cumulative pore pressure model under the combined action of three factors,i.e.,soil confining pressure,cyclic loading amplitude,and loading frequency,based on the tested results,the variations of strain settlement index b and pore pressure settlement coefficient Nβ with the change rule of cycles were discussed.The results showed that,the large changes of the values of b and Nβ mainly occurred in the first 10000 rounds of cycles,and the most significant changes occurred in the previous 1000 rounds of cycles.With the increase of cycling times,the values of b decreased,but the value of Nβ increased.The values of b and Nβ kept stable gradually after one hundred thousand cycles.The settlement calculation results of a tunnel during construction were in good agreement with the measured values.It was suggested that the values of b and Nβ were determined by the number of loading cycles for the soil mass subsidence prediction of the period of construction.The stable values of b and Nβ were used in prediction of tunnel long-term settlement.This research results provided valuable references for predicting subsidence of soil during the tunnel construction.关键词
动三轴试验/循环加载/施工沉降/应变沉降指数/孔压沉降系数/沉降计算Key words
dynamic triaxial test/cyclic loading/construction settlement/strain settlement index/pore-pressure settlement coefficient/settlement calculation分类
建筑与水利引用本文复制引用
刘阳,任青,喻孟初,颜超,马荣全..盾构隧道施工期间土体沉降计算分析[J].水资源与水工程学报,2017,28(1):214-219,6.基金项目
国家自然科学基金青年基金项目(51008194) （51008194）
