黏性地层盾构刀盘泥饼固结硬化试验研究
Experimental Study on Consolidation and Hardening of Mud Cake of Shield Cutterhead in Cohesive Stratum
王宇博 1周凯歌 1方勇 1刘四进 2马浴阳2
作者信息
- 1. 西南交通大学交通隧道工程教育部重点实验室,成都 610031
- 2. 中铁十四局集团大盾构工程有限公司,南京 210031
- 折叠
摘要
盾构在黏性地层中掘进时刀盘容易出现结泥饼问题,严重时堵塞刀盘降低盾构掘进效率,影响施工安全.渣土粘附在刀盘的过程中伴随着泥饼的固结硬化,为探明盾构刀盘泥饼固结硬化的影响因素,通过自制的刀盘掘进模拟装置开展了室内试验,研究了土体性质、温度、刀盘土压力与泥饼固结硬化特征之间的关系,进行了渣土改良实验,探究了不同改良剂对泥饼固结硬化程度的影响.结果表明:泥饼的含水率与锥入深度可以表征泥饼的固结硬化特征;土体的性质对掘进后刀盘形成泥饼的固结硬化程度影响最大,温度次之,刀盘土压力对泥饼的固结硬化程度存在地层差异性;泡沫剂对纯黏土与含砂黏土泥饼的固结硬化作用改善效果明显,分散剂则仅在纯黏土中存在明显作用.
Abstract
The cutterhead is prone to mud cake problems when the shield is tunneling in the cohesive stratum.In severe cases,the cutterhead is blocked to reduce the shield tunneling efficiency and affect construction safety.During the process of the slag adhering to the cutter head,it is accompanied by the solidation and hardening of the mud cake.To find out the influencing factors of consolidation and hardening of mud cake in shield cutterhead,laboratory tests are carried out by using a self-made cutter head tunneling simulation device.The relationship between soil properties,temperature,cutterhead earth pressure,and consolidation and hardening characteristics of mud cake is studied.The experiment of soil conditioning is carried out to explore the influence of different soil conditioners on the degree of consolidation and hardening of mud cake.The results show that the water content and cone penetration depth of mud cake can characterize the consolidation and hardening characteristics of mud cake.The properties of the soil have the greatest influence on the degree of consolidation and hardening of the mud cake formed by the cutterhead after excavation,followed by the temperature,and the cutterhead earth pressure has stratigraphic differences on the degree of consolidation and hardening of the mud cake.The foam agent has an obvious effect on the consolidation and hardening of pure clay and sand-containing clay cake,while the dispersant only has an obvious effect on pure clay.
关键词
盾构隧道/黏性地层/泥饼/固结硬化/室内试验Key words
shield tunnel/cohesive stratum/mud cake/consolidation hardening/laboratory test引用本文复制引用
基金项目
国家自然科学基金(52078428)
四川省杰出青年基金(2020JDJQ0032)
中国铁建股份有限公司科研计划课题(2018-1306)()
出版年
2024
NETL
NSTL
万方数据