摘要
浅埋暗挖人行地下通道修建过程中,合理确定开挖进尺的大小至关重要,开挖进尺过小,工期延长,临时支护增加;开挖进尺过大,易引起上覆土层不稳定,甚至塌方。针对开挖进尺难以确定的问题,基于太沙基松散介质理论,推导了均质土中开挖进尺的计算公式,并推广到成层土中。通过对某人行地道进行有限差分模拟,并与文中计算方法进行了对比分析,得出了一些对人行地下通道具有实践指导意义的结论。
In the construction of the pedestrian underpass of underground excavation with shallow overburden,it is crucial to rationally delimit the size of digging length.If the size of digging length is too small,the construction time will be prolonged and temporary protection will increase.If the size is too large,the earth on the top of the tunnel will be unstable,even collapse.Based on Terzaghi’s loose medium theory,a calculating formula of digging length in homogeneous soil is proposed and applied to layered soil.Some valuable conclusions on the shallow underpass construction are proposed through the simulation of finite difference method of Qingchun underpass;and their comparisons are made.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第8期2637-2642,共6页
Rock and Soil Mechanics
关键词
浅埋暗挖
人行地下地道
开挖进尺
松散介质理论
underground excavation with shallow overburden
pedestrian underpass
digging length
loose medium theory
