摘要
为研究下穿铁路的顶管施工对路基沉降的影响,以昆武高速地面排水下穿云冶铁路工程为例,采用有限元模拟法,以不同覆土厚度的9.0 m×4.4 m截面为施工管廊截面,并在开挖时与开挖停止2种工况下对土层变化进行分析。结果表明:12 m覆土厚度满足顶管土层沉降要求;顶管过程中,顶管机前方0~16 m及3倍管径范围内的土层需进行加固处理;推进停止时,附加推力、摩擦力对土层水平位移起决定作用。研究结论可为铁路的安全运营提供理论依据。
In order to study the influence of the pipe jacking construction on the subgrade settlement underpassing railway,taking the ground drainage project of Kunming-Wuhan high speed underpassing railway as an example,using the finite element simulation method,taking the section of 9.0 m×4.4 m with different thickness of overburden as the construction pipe gallery section,and analyzing the soil layer change under the two conditions of excavation and excavation stop.The results show that the 12 m thickness of soil cover can meet the requirements of pipe jacking soil settlement;during pipe jacking,the soil layer within 0~16 m and 3 times of pipe diameter in front of pipe jacking machine needs to be reinforced.When the propulsion stops,the additional thrust and friction play a decisive role in the horizontal displacement of soil layer.The conclusion can provide theoretical basis for the safe operation of railway.
作者
曲洋
QU Yang(China Railway 18th Bureau Group Third Engineering Co.,Ltd.,Zhuozhou,Hebei 072750,China)
出处
《建筑施工》
2020年第2期244-246,共3页
Building Construction
关键词
土压平衡顶管
铁路路基
土层沉降
有限元模拟
soil pressure balance pipe jacking
railway subgrade
soil settlement
finite element simulation
