隧道初期支护模袋混凝土抗压强度试验研究  

Experimental Study on Compressive Strength of the Mold Bag Concrete in Primary Support of Tunnel

作　　者：李鹏飞[1] 滕卓 张明聚[1] 刘雅丹 贺维国 房倩[4] LI Pengfei;TENG Zhuo;ZHANG Mingju;LIU Yadan;HE Weiguo;FANG Qian(Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China;Beijing Construction Engineering Safety and Quality Supervision Station,Beijing 100073,China;China Railway Liuyuan Group Co.,Ltd.,Tianjin 300133,China;Key Laboratory of Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京市建设工程安全质量监督总站,北京100073 [3]中铁第六勘察设计院集团有限公司,天津300133 [4]北京交通大学城市地下工程教育部重点实验室,北京100044

出　　处：《铁道标准设计》2024年第1期132-137,166,共7页Railway Standard Design

基　　金：国家自然科学基金面上项目(51978018,51978019);北京市自然科学基金面上项目(8222004,8222005)。

摘　　要：为研究隧道新型支护模袋混凝土的抗压强度,设计了高流态混凝土配合比,对4个不同试验工况的混凝土试件,以3,7,28 d抗压强度为考察指标,分析在相同排水条件下模袋以及在相同模袋条件下有压排水对于混凝土抗压强度的影响。对比分析养护龄期对不同试验工况混凝土抗压强度的影响,揭示了不同试验工况混凝土破坏形态。结果表明:模袋对混凝土抗压强度影响不大,但可以提高其整体变形能力;有压排水可大幅度提升混凝土抗压强度,且提升随养护龄期增长呈现先增加后减少的规律;不排水混凝土抗压强度前期增长较慢后期较快,而有压排水混凝土恰好相反;无模袋混凝土破坏时形成两个对顶的角锥形破坏面,有模袋混凝土破坏时裂缝沿着平行于力的作用方向产生,但两者边缘都有贯穿裂缝。研究成果可为探究模袋混凝土力学性能及强度试验方法提供一定参考。In order to study the compressive strength of the new tunnel support mold bag concrete,a high-fluid concrete ratio was designed and the effects of mold bag and pressurised drainage on the compressive strength of concrete under the same drainage conditions and under the same mold bag conditions were analysed for four concrete specimens with different test conditions,using the compressive strength at 3,7 and 28 d as the indexes.The effect of curing age on the compressive strength of concrete in different test conditions was compared and the damage pattern of concrete in different test conditions was revealed.The results show that:The mold bag has little effect on the compressive strength of concrete,but can improve its overall deformation capacity;pressurised drainage can significantly increase the compressive strength of concrete and the increase shows a pattern of increasing and then decreasing with the age of curing;the compressive strength of undrained concrete increases slowly in the early stage and faster in the later stage,while the opposite is true for pressurised drainage concrete;Concrete damage without mold bags forms two angular conical damage surfaces against the top,and with mold bags cracks occur along the direction of action parallel to the forces,but with penetration cracks at both edges.The research results can provide some reference for exploring the mechanical properties and strength test methods of mold bag concrete.

关 键 词：模袋混凝土 抗压强度 模袋 有压排水 养护龄期 破坏形态 

分 类 号：U455.7[建筑科学—桥梁与隧道工程] U454[交通运输工程—道路与铁道工程]