盾构隧道开挖面极限支护压力三维极限平衡解  

Three-Dimensional Limit Equilibrium Solution of the Support Pressure on the Shield Tunnel Face

作　　者：胡雯婷[1,2] 吕玺琳[1,2] 黄茂松[1,2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土与地下工程教育部重点实验室,上海200092

出　　处：《地下空间与工程学报》2011年第5期853-856,862,共5页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(50908171);国家杰出青年基金资助项目(50825803);上海市晨光计划项目(10CG23)

摘　　要：通过优化楔形滑块倾角并考虑滑块侧面土体抗剪强度的影响,对现有三维梯形楔形体模型进行改进,建立了一种盾构隧道开挖面极限支护压力的三维极限平衡计算模型。推导了极限支护压力的计算公式,并通过优化分析得到了其最优解。通过优化得到的滑块倾角随隧道埋深增加略有减小,随土体内摩擦角φ增大而增大,且高于通过π/4+φ/2得到的值。对土体内摩擦角和隧道埋深对极限支护压力计算值的影响进行了分析,结果表明隧道埋深对极限支护压力计算结果的影响远小于土体的内摩擦角,且当土体内摩擦角较大或隧道深埋时,支护压力值几乎不受隧道埋深的影响。通过对离心模型试验结果的理论预测表明所建模型是合理的,并优于现有的三维楔形体模型计算结果。In this study,through the optimization of wedge block inclined angle and taking lateral soil strength of the wedge into account,the existing 3D trapezoidal wedge model is improved to determine the minimum required support pressure for stabilizing shield tunnel face.The formula for calculating the limit support pressure is deduced and its solution is obtained by the optimization analysis.The resultant inclined angle decreases slightly with the increasing of tunnel depth while increases with the increasing of the friction angle of soils.Furthermore,the resultant inclined angle of wedge block is larger than that obtained by π/4＋φ/2.Parametric analysis shows that the friction angle of soils has more significant influence on the minimum required support pressure than the tunnel depth..When the friction angle is large or the tunnel is deep by immersed,the tunnel depth shows almost no influence on the minimum required support pressure.The theoretical prediction of centrifugal-test results indicates the rationality of the proposed model and its superiority to existing 3D wedge models.

关 键 词：盾构隧道 支护压力 开挖面稳定 极限平衡法 

分 类 号：TU942[建筑科学—建筑技术科学]