發(fā)布時(shí)間：2018-09-19 05:56

【摘要】：基坑工程位于地鐵隧道之側(cè),基坑開挖卸荷導(dǎo)致地鐵隧道襯砌產(chǎn)生位移,水平位移朝向基坑內(nèi)側(cè),而豎向位移主要表現(xiàn)為隆起,地鐵隧道襯砌豎向隆起量要大于水平位移;地鐵隧道襯砌位移隨著基坑開挖逐漸增大。地鐵隧道離基坑越遠(yuǎn)且地鐵隧道埋深越深,地鐵襯砌豎向隆起量及水平位移就越小。以楓亭隧道明挖基坑為工程實(shí)例,采用地連墻+4道橫撐+2道豎向支撐的支護(hù)方式、盆式開挖方法、合理的地連墻嵌固深度等方式來控制地鐵隧道襯砌的變形,并以"地鐵隧道結(jié)構(gòu)的絕對豎向位移及水平位移要≤20 mm"為控制標(biāo)準(zhǔn),對基坑開挖進(jìn)行了數(shù)值模擬,結(jié)果顯示控制措施能保證地鐵隧道正常運(yùn)營安全。
[Abstract]:The foundation pit is located at the side of the subway tunnel. The unloading of the foundation pit causes the displacement of the lining of the subway tunnel, and the horizontal displacement is towards the inside of the foundation pit, while the vertical displacement is mainly shown as uplift, and the vertical uplift of the lining of the subway tunnel is larger than the horizontal displacement. The lining displacement of subway tunnel increases with the excavation of foundation pit. The farther the subway tunnel is from the foundation pit and the deeper the subway tunnel is buried, the smaller the vertical uplift and horizontal displacement of the subway lining are. Taking the open excavation foundation pit of Fengting tunnel as an engineering example, the deformation of subway tunnel lining is controlled by four supporting modes of horizontal bracing, two vertical braces, the method of basin excavation, and the reasonable depth of embedded ground connection wall to control the deformation of subway tunnel lining. Based on the control standard of "absolute vertical displacement and horizontal displacement of subway tunnel structure should be 鈮，

本文編號：2249245