摘要
我国沿海经济发达城市及一些内陆中心城市正在兴建或筹建地铁,这些地区的地下广泛分布着较厚的软黏土沉积层。为研究土压平衡盾构在这种软土地层中施工的适应性,以上海地铁M8线某区间隧道工程为研究背景,采用室内模型试验的方法,开展在不同埋深、不同刀盘开口率、不同推进速度以及不同螺旋机转速等情况下的盾构掘削模型试验。通过对试验结果的整理与分析,得出土仓压力与排土效率、单位时间排土量与推进速度、推力和扭矩之间的内在联系,以及隧道埋深、刀盘开口率、推进速度对推力和扭矩的影响。这些结论的取得为盾构施工参数之间及其与地层特性之间的适应性理论提供了有益的帮助,并为更好地指导软土地层盾构隧道的设计与施工服务。
Deep sedimentary deposits of soft clays are widely distributed in coastal areas as well as in many interior cities in China. In order to study the stratum adaptability of EPB shield t in such types of soft ground, model tests of tunneling excavation, using the running tunnel of the Shanghai Metro Line M8 as a background, are carried out with different tunnel depths, opening rates of cutter head, driving speeds and rotation speeds of screw conveyor. Based on the test results, the interrelationships between chamber pressure and mucking efficiency, mucking rate and driving speed, thrust force and torque are obtained. The influences of tunnel depth, opening rate of cutter head and driving speed on thrust force and torque are revealed. Such findings not only facilitate for establishing relationships between shield working parameters and soil properties, but also serve as a guide to the design and construction of shield tunnel in soft ground.
出处
《土木工程学报》
EI
CSCD
北大核心
2007年第9期87-94,共8页
China Civil Engineering Journal
基金
国家863计划项目--大深度大断面地下穿越工程与微扰动施工研究(2006AA11Z102)
上海高校选拨培养优秀青年教师科研专项基金
关键词
软土地层
模型试验
土压平衡盾构机
土体-盾构系统
地层适应性
soft ground
model test
EPB shield machine
soil body-shield machine system
adaptability to stratumproperty