摘要
从盾构隧道上覆土的最小厚度计算入手,提出因注浆浆液或泥浆、水等液体包裹管片而形成的静态浮力通常不足以使隧道上浮;在分析注浆压力分布模式的基础上,将注浆压力可能产生的动态上浮力与浆液环产生的静态浮力进行了比较,认为因注浆压力产生的动态上浮力是盾构隧道施工中产生上浮的主要原因,进而提出了控制盾构隧道管片上浮的最小上覆土厚度及最大注浆压力计算式,验算结果与实际情况吻合;最后,基于对管片上浮机理的分析,对管片上浮控制提出了一些建议,并提出为防止管片上浮,需依据埋深、周围土体特性、注浆孔在管片环上的位置情况等对注浆压力实施动态控制.
Based on the calculation for the least depth of the overburden, the buoyancy caused by grouts, slurry or water enwrapping around the tunnel segments is not considered to be big enough to in- duce the upward moving of the shield tunnel. Then, two kinds of buoyancies caused by grouts and grouting pressure respectively are compared in terms of the distribution models of the grouts. Results show that the buoyancy caused by grouting pressure is the dominating factor to bring about segments upward moving; thus the formula for the calculation of the least depth of the overburden and the maximal grouting pressure is deduced, which proves to be accordant with the actual situation. Finally, some proposals for controlling the upward moving of shield tunnel are put forward on the basis of the analysis of the moving reasons. The dynamic control for grouting pressure is recommended to be carried out according to the overburden,soil properties and the location of the grouting holes on segment rings.
出处
《同济大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2008年第6期738-743,共6页
Journal of Tongji University:Natural Science
基金
国家“八六三”高技术研究发展计划资助项目(2006AA11Z102)
关键词
盾构隧道
施工
上浮
注浆
管片
shield tunnel
construction
upward moving
grouting
tunnel segments