兰州地铁1号线黄河隧道盾构施工难点及应对措施研究

发布时间：2018-11-17 10:23

【摘要】：兰州地铁黄河隧道为国内首条交通工程类下穿黄河隧道,地质条件极为独特。为解决盾构连续性长距离在大粒径高压富水弱胶结高硬度的砂卵石地层中如何安全顺利掘进下穿黄河,采用理论分析与现场施工反馈紧密结合的方法,研究盾构下穿黄河施工难点及应对措施。研究表明:土压盾构在穿黄施工中相继遇到刀盘卡机、刀具磨损、螺旋机喷涌、固结泥饼、地面塌陷等问题;泥水盾构相继遇到掘进困难、卵石积仓滞排堵管、破碎机故障频发、刀盘刀具管路磨损、泥浆击穿河床等问题,通过设备改造,优化掘进参数,做好区间降水、工法辅助、泥浆制配、渣土改良、刀具改进、气压稳定等工作,有效解决盾构在砂卵石地层中掘进的相关问题,确保黄河隧道顺利建成。
[Abstract]:The Yellow River Tunnel of Lanzhou Metro is the first traffic engineering tunnel in China, and the geological conditions are very unique. In order to solve the problem of how to drive through the Yellow River safely and smoothly in the sand and pebble strata with large particle size, high pressure, rich water, weak cementation and high hardness, the method of theoretical analysis and field construction feedback is used to solve the problem. This paper studies the difficulties and countermeasures in the construction of the Yellow River under shield tunneling. The results show that the earth pressure shield machine has encountered many problems such as cutter clamping machine tool wear spout of spiral machine consolidation of mud cake ground collapse and so on in the construction of earth pressure shield through yellow. Mud water shield machine has encountered many problems, such as difficulty in driving, stalling and plugging pipe in pebble storehouse, frequent breakage of crusher, wear of cutting tool line of cutter head, mud breaking through river bed, etc. Through equipment reformation, optimization of tunneling parameters, good interval dewatering and auxiliary work method, In order to ensure the smooth construction of the Yellow River Tunnel, mud preparation and distribution, residual soil improvement, tool improvement and air pressure stability can effectively solve the related problems of shield tunneling in sand and pebble strata and ensure the smooth construction of the Yellow River Tunnel.
【作者单位】：中铁第一勘察设计院集团有限公司;
【分类号】：U231.3;U455.43

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