土压平衡盾构施工穿越砂层渣土改良试验研究  

Soil improvement for earth pressure balance shields construction in full section sand layer

作　　者：胡长明[1] 崔耀[2] 王雪艳[1] 贡少瑞[1] 张文萃[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]郑州大学综合设计研究院有限公司,河南郑州450002

出　　处：《西安建筑科技大学学报（自然科学版）》2013年第6期761-766,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：陕西省科技攻关计划项目(2011k10-20);包头市科技计划项目(2011x1006;2012x1002)

摘　　要：针对地铁隧道采用土压平衡盾构施工穿越砂层时表现出的非适应性开展了渣土改良及现场试验研究,通过对比渣土经不同配比膨润土泥浆改良前后的抗剪强度、渗透性及塌落度,得到了合理的膨润土浓度及泥浆掺入比.研究表明:当砂层采用浓度为1∶10膨润土泥浆改良后,渣土的塑性及流动性得到有效提高,抗剪强度及渗透性大幅降低;控制泥浆体积掺入比为1∶5进行掘进施工时,盾构机刀盘内外温度及磨损程度明显降低、排土顺畅且推进速度提高.研究成果对于解决土压平衡盾构穿越砂层时土压难以平衡、排土不正常、刀盘扭矩过大及磨损过快等问题具有参考价值.Soil improvement and field research are made for the unadaptability in earth pressure balance shield in the sand layer. Comparing shearing strength, slump and permeability of soil before and after the improvement, suitable bentonite slurry concentration and cement ratio are obtained. The study shows that plastic flow of soil is improved and shearing strength and permeability decreased greatly with bentonite slurry concentration of 1 ： 10. Temperature and wear degree of shield cutterhead are reduced significantly,soil output is smooth and shield excavation efficiency increased with slurry ce- ment ratio of 1：5. The research has certain reference significance for solving problems of shiled work-face unbalance, ab- normal soil output,high torque and excessive wear of shield cutterhead in earth pressure balance shield in sand layer.

关 键 词：土压平衡盾构 非适应性 渣土改良 掺入比 刀盘温度 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]