长春中风化泥岩盾构施工泥饼防治研究  

Prevention and Control of Muck Cake of Shield Tunneling in Moderately-Weathered Mudstone in Changchun,China

作　　者：黄喆 马超 辛志勇 阳林 李建锋 王树英[3,4] 朱汉标 HUANG Zhe;MA Chao;XIN Zhiyong;YANG Lin;LI Jianfeng;WANG Shuying;ZHU Hanbiao(Electric Engineering Co.,Ltd.of China Railway No.5 Engineering Group,Changsha 410117,Hunan,China;China Railway Investment Group Limited,Beijing 100055,China;School of Civil Engineering,Central South University,Changsha 410075,Hunan,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China)

机构地区：[1]中铁五局集团电务工程有限责任公司,湖南长沙410117 [2]中铁投资集团有限公司,北京100055 [3]中南大学土木工程学院,湖南长沙410075 [4]深圳大学土木与交通工程学院,广东深圳518060

出　　处：《隧道建设（中英文）》2024年第9期1841-1851,共11页Tunnel Construction

基　　金：国家自然科学基金资助项目(51778637);2022年度中南大学研究生自主探索创新项目(2022ZZTS0689)。

摘　　要：为更好地分析盾构结泥饼风险及渣土塑流性特征,开展旋转剪切试验、三轴试验和坍落度试验,探究长春中风化泥岩渣土黏附强度和抗剪强度特征;基于渣土强度提出长春泥岩渣土合理改良坍落度的建议,并结合实际工程验证其合理性。主要结论如下:1)随着含水率的增大,长春中风化泥岩渣土(界面)黏聚力先增大后减小,(界面)摩擦角逐渐减小。当含水率为22.58%~27.36%时,土-金属间的界面黏聚力大于黏聚力;当含水率为15.99%~24%时,界面摩擦角大于内摩擦角。2)渣土坍落度与强度密切相关,随着坍落度的增大,渣土黏附强度和抗剪强度快速降低。当坍落度大于4 cm时,黏附强度和抗剪强度变化较小;当坍落度为0.5~1 cm时,渣土黏附强度大于抗剪强度,因此建议盾构渣土坍落度不小于1 cm,且尽可能使渣土坍落度大于4 cm,以充分减小渣土强度和增大渣土塑流性。To comprehensively analyze the muck cake risk of shield tunneling and plastic flow characteristics of muck,a series of tests on rotational shear,triaxial,and slump are conducted to explore the adhesion characteristics and shear strength parameters of moderately-weathered mudstone in Changchun,China.Based on muck strength,reasonable improvements for the slump of the mudstone are proposed,and their rationality is validated in actual engineering.The main conclusions drawn include the following:(1)With the increase in the water content,the(interfacial adhesion)cohesion of the moderately-weathered mudstone increases first and then decreases,and the(interfacial)friction angle gradually decreases.At the water content of 22.58%-27.36%,soil and metal exhibit a greater interfacial adhesion than cohesion.Moreover,when the water content is 15.99%-24%,the interfacial friction angle is greater than the internal friction angle.(2)The slump value is closely related to muck strength.With the increase in the slump value,the adhesion and shear strengths of the muck exhibit a rapid decrease.When the slump value is greater than 4 cm,adhesion and shear strengths show relatively small changes.In addition,at the slump value between 0.5 and 1 cm,the muck attains a greater adhesion strength than shear strength.Therefore,the slump value of moderately-weathered mudstone during shield tunneling should not be less than 1 cm,and that of muck should be as large as possible that is,more than 4 cm,to reduce the muck′s strength and increase its fluidity sufficiently.

关 键 词：中风化泥岩 盾构 黏附强度 抗剪强度 坍落度 渣土改良 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]