摘要
结合统一土体移动模型,基于相似理论设计并开展室内模型试验,考虑岩质材料物理力学参数对盾构施工引起地层扰动范围的影响,通过对Verriujt公式进行修正,建立适用于软岩地区盾构施工引起的地层沉降预测的计算方法。研究表明:由修正的Verriujt计算公式得到的沉降值与试验值吻合较好。Verriujt计算公式所得沉降曲线与模型试验结果相比,沉降曲线的曲率相似,但对于不同深度地层,愈接近地表吻合程度愈差。由统一土体移动模型得到的沉降槽最大沉降值比试验值偏大;盾构施工在软岩地层引起的最大沉降发生在隧道上方,沿水平方向呈非线性减小;软岩地层上覆不同土体时,修正的Verriujt公式仍具有较好的吻合性,通过算例分析证明了其对实际工程中由盾构施工引起的地层沉降预测的可靠性。
Based on the unified soil movement model,the influence of the physical and mechanical parameters of rock materials on the ground disturbance caused by shield construction was considered. With the Verriujt calculation formula modified,the calculation method for predicting the ground settlement caused by shield construction in soft rock area was established. Meanwhile,the indoor model test was carried out based on the similarity theory. The results showed that the settlement value obtained by the modified Verriujt formula was in good agreement with the experimental value. In regard to the settlement curves obtained from Verruijt calculation formula and model test,the curvatures of settlement form were similar,but the goodness of fit become worse as ground depth was closer to the surface. The maximum settlement value of settlement trough obtained by the unified soil movement model was larger than that obtained by experimental value. The maximum settlement caused by shield construction in soft rock ground was above the tunnel and decreased nonlinearly along horizontal direction. When the overlying ground were different,the modified Verriujt formula was still of good applicable.With the analysis of the example,the calculation method in this paper was proved to be reliable for predicting the ground settlement caused by shield construction in practical engineering.
作者
王海涛
苏鹏
孙昊宇
祁可录
邵军辉
WANG Haitao;SU Peng;SUN Haoyu;QI Kelu;SHAO Junhui(School of Civil Engineering,Dalian Jiaotong University,Dalian,Liaoning 116028,China;College of Architecture and Technology,Liuzhou Railway locational Technical College,Litzhou,Guangxi 54500,China;The Second Engineering Co.,Ltd.,of China Railway Seventh Group,Shenyang,Liaoning 110000,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2020年第S02期3549-3556,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
辽宁省重点研发计划指导计划项目(2017231001)
中铁七局集团科技研究开发计划项目(17A01)
辽宁省高等学校创新人才支持计划项目(LR2017047)。
关键词
隧道工程
软岩
盾构
沉降预测
模型试验
tunnelling engineering
soft rock
shield machine
settlement prediction
model test
