摘要
结合武汉轨道交通8号线越江区间隧道建设,为研究大直径泥水平衡式盾构穿越砂性地层引起的地表沉降问题,开展盾构施工扰动下地表沉降现场监测分析,盾构穿越过程中部分地表产生较大隆起,且变形稳定后隆起值较大,通过分析盾构施工参数与现场监测数据,判断注浆压力过大为导致地表产生较大隆起的主要原因;通过数值计算,分析不同注浆压力下变形稳定后的沉降槽曲线,结果表明:采用实际注浆参数的计算结果与实测数据比较吻合;考虑到施工中一些不确定因素的影响,结合数值计算结果,为了将地表隆陷控制在较小的量值范围之内,大直径泥水平衡盾构穿越相似条件地层时合理的注浆压力为0. 55～0. 60 MPa。
Based on the crossing-river tunnel construction of Wuhan Metro Line 8, on-site monitoring and analysis of ground settlement under the disturbance of shield construction are conducted to study the problem of ground settlement where a large-diameter sluw/shieht passes through sandy strata. During the shieht tunneling, large uplift occurs on part of the ground, larger uplift takes place alter the deformation gets stable. By analyzing the shieht construction parameters and on-site monitoring data, the main reason that causes large uplift is the excessive grouting pressure. By analyzing the curve of the settling tank under different grouting pressure with numerical calculation, the calculation result under actual grouting pressure fits well with the measured data under actual grouting pressure. Considering the influenee of some uncertain factors during construction and the numerical calculation results, the reasonable grouting pressure for large-diameter sluw/ shieht tunneling through similar strata is 0.55 - 0.60 MPa to control surface subsidence within a relatively small range.
作者
包雨生
李策
梁敏飞
王士民
BAO Yu-sheng;LI Ce;LIANG Min-fei;WANG Shi-min(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2018年第12期136-140,共5页
Railway Standard Design
基金
国家自然科学基金面上项目(51578461)
