硬塑性黏土地层泥水盾构停机引起的地表塌陷机制研究

发布时间：2018-01-12 04:13

本文关键词：硬塑性黏土地层泥水盾构停机引起的地表塌陷机制研究　出处：《岩土力学》2017年04期 　论文类型：期刊论文

【摘要】：扬州瘦西湖隧道采用泥水盾构穿越全断面硬塑性黏土地层,施工停机后多次出现地表塌陷事故。利用室内试验研究硬塑性黏土浸水条件下的崩解、软化特性,结合现场实测数据分析该工程地表塌陷的原因,进一步讨论此类破坏发生的过程,据此提出泥水盾构在全断面硬塑性黏土地层施工时地表塌陷的预防措施。研究表明:泥水盾构停机使开挖面硬塑性黏土在泥水浸润下发生崩解、软化,使开挖面上方形成局部孔洞;随着时间延长,局部孔洞逐渐向上发展直至地表,最终形成地面局部塌陷。泥水盾构在硬塑性黏土地层施工时,应当避免停机;当必须停机时,应尽量缩短停机时间,避开建筑地段,同时加强地面监测,必要时应在开挖面上方地层进行注浆加固,防止坍塌破坏。
[Abstract]:Yangzhou thin West Lake Tunnel used mud shield to pass through the whole section of hard plastic clay stratum, after the construction stopped, there were many ground collapse accidents. Laboratory tests were used to study the disintegration and softening characteristics of hard plastic clay under the condition of water immersion. Based on the field measured data, the causes of surface collapse of the project are analyzed, and the process of this kind of failure is further discussed. Based on this, the paper puts forward the prevention measures of ground surface collapse during the construction of mud-water shield in the whole section of hard plastic clay stratum. The research shows that when the mud shield machine stops, the hard plastic clay on the excavated surface will collapse and soften under the mud water infiltration. Forming a local hole above the excavating surface; With the extension of time, the local holes gradually develop up to the surface of the earth and eventually form a local collapse of the ground. The mud shield construction in the hard plastic clay formation should avoid stopping; When it is necessary to stop, the downtime should be shortened, the construction area should be avoided, and the ground monitoring should be strengthened. If necessary, grouting should be carried out above the excavated surface to prevent collapse and destruction.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学土木与交通学院;南水北调东线江苏水源有限责任公司;南通职业大学建筑工程学院;中铁十四局集团有限公司;
【基金】：中央高校基本科研业务费专项资金资助(No.2016B01214) 国家自然科学基金项目(No.51408191,No.51209142)~~
【分类号】：U455.43
【正文快照】： 1 p, ° 近年来,随着越江过湖和跨海隧道的兴建,泥水盾构工法越来越广泛地在我国各大中城市得到应用。盾构施工复杂繁琐,受到许多不可预知的因素制约,因而时常被迫停机,从而对施工安全和周围环境造成不利影响,如南京长江隧道、南京纬三路过江通道、狮子洋隧道等工程,均发生

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