高水压条件下泥水盾构隧道开挖面支护压力特性分析  

Face supporting pressure of slurry shield tunnel under high hydraulic pressure

作　　者：陈孟乔[1] 刘建坤[1] 肖军华[2] 田泽野 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]南京工业大学土木工程学院,江苏南京210009

出　　处：《岩土工程学报》2013年第S2期163-169,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41171064);国家基础研究计划"973"项目(2012CB026104)

摘　　要：高水压条件下,泥水盾构隧道施工过程中开挖面支护压力对开挖面稳定性和地层变形的影响很大。结合南京地铁3号线浦珠路站—滨江路站区间过江隧道工程,建立了模拟盾构隧道开挖面失稳过程的数值模型,研究了开挖面支护压力与土体变形之间的关系以及相关参数对其影响。研究表明,相比于无水压的情况,高水压条件下开挖面前方土体发生较小位移时开挖面支护压力就达到极限值,且极限值增大约一个量级,开挖面更易失稳。随着内摩擦角、水位和隧道直径的增大,开挖面极限支护压力比增大,开挖面稳定性降低,但变化趋势逐渐变缓,开挖面极限支护压力比与内摩擦角、水位呈抛物线形式,与隧道直径呈幂函数形式。随着黏聚力、埋深的增大,开挖面极限支护压力比减小,开挖面稳定性升高,但变化趋势逐渐变缓,呈抛物线形式。弹性模量对开挖面稳定性几乎没有影响。研究结果可为高水压条件下盾构隧道施工中合理确定支护压力提供参考。Face supporting pressure has great influence on face stability and ground deformation under high hydraulic pressure during slurry shield tunneling. Based on the under-river tunneling project of Nanjing Metro Puzhulu-Binjianglu interval, a numerical model is established to simulate the process of instability, the relation between face supporting pressure and soil deformation and the impact of relevant parameters are studied. The results show that, compared the case without no hydraulic pressure, the limit supporting pressure is reached when smaller soil displacement has occurred and the value the much greater under high hydraulic pressure. The ratio of the limit supporting pressure increases and the face stability decreases with the increase of the internal friction angle, water levle and tunnel diameter. The relation curve of the limit supporting pressure and the internal friction angle(water level) is parabola, and that of the limit supporting pressure and tunnel the diameter is power function. The ratio of the limit supporting pressure decreases and the face stability increases with the increase of the cohesion and tunnel depth. The relation curve of the limit supporting pressure and cohesion(tunnel depth) is parabola(power function). The elastic modulus has almost no effect on the face stability. The research may provide a reference for the determination of face supporting pressure during slurry shield tunneling under high hydraulic pressure.

关 键 词：盾构隧道 开挖面稳定 支护压力 高水压 

分 类 号：U451[建筑科学—桥梁与隧道工程] U455.43[交通运输工程—道路与铁道工程]