弃渣混合料与混凝土接触面剪切力学特性  

Shear mechanical behavior of interface between spoil mixture and concrete

作　　者：朱武俊 王晅[1,2] 张家生[1,2] 陈晓斌[1,2] 成浩 王永倩 李度 ZHU Wujun;WANG Xuan;ZHANG Jiasheng;CHEN Xiaobin;CHENG Hao;WANG Yongqian;LI Du(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center for High-Speed Railway Construction Technology,Central South University,Changsha 410075,China;Foshan Transportation Science and Technology Co.,Ltd.,Foshan 528300,Guangdong,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中南大学高速铁路建造技术国家工程研究中心,长沙410075 [3]佛山市交通科技有限公司,广东佛山528300

出　　处：《哈尔滨工业大学学报》2023年第2期98-107,共10页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51978674)。

摘　　要：为理清粗糙度、含石量、法向应力对灰质岩弃渣混合料与混凝土接触面剪切力学特性的影响,采用新型大型直剪仪对4种含石量的灰质岩弃渣混合料和5种粗糙度的混凝土面板分别在不同法向应力条件下进行系列接触面剪切试验,探究粗糙度、含石量、法向应力变化对接触面剪切强度的影响,揭示三者与接触面剪切力学特性的内在关联及接触面抗剪强度机制。结果表明:相同法向应力条件下,随粗糙度的增加,接触面抗剪强度呈现先增加后减小的趋势,且粗糙接触面能显著提高接触面的剪胀程度,但随法向应力的增加,粗糙度对接触面抗剪强度和法向变形的影响均减弱;相同法向应力条件下,随含石量的增加,接触面抗剪强度的变化规律与法向应力的大小密切相关。同时,试验数据分析表明接触面抗剪强度与Mohr-Coulomb强度准则高度吻合,且粗糙度和含石量对接触面表观黏聚力的影响相比对接触面内摩擦角的影响更为显著。合理的粗糙度和含石量能较大程度地提高弃渣混合料与混凝土接触面的抗剪强度。To study the influences of roughness,gravel content,and normal stress on the shear mechanical properties of the interface between limestone spoil mixture and concrete,a series of interface shear tests were carried out on limestone spoil mixtures with four types of gravel content and concrete surfaces with five types of roughness under different normal stress conditions by using a new large-scale direct shear apparatus.The influences of roughness,gravel content,and normal stress on the shear strength of the interface were investigated,and the internal relationships between roughness,gravel content,normal stress,and the shear mechanical properties of the interface,as well as the mechanism of shear strength were revealed.Test results show that under the same normal stress condition,as the roughness increased,the shear strength of the interface increased and then decreased,and the rough interface significantly increased the degree of dilation of the interface,but with the increase in normal stress,the influence of roughness on the shear strength and normal deformation of the interface was weakened.Under the condition of same normal stress,with the increase in gravel content,the variation of the shear strength of the interface was closely related to the magnitude of the normal stress.Besides,the shear strength of the interface was highly consistent with the Mohr-Coulomb strength criterion,and the influence of roughness and gravel content on the apparent cohesion of the interface was more significant than that on the internal friction angle of the interface.To a great extent,rational roughness and gravel content can improve the shear strength of the interface between spoil mixture and concrete.

关 键 词：接触面 剪切力学特性 粗糙度 含石量 灰质岩弃渣混合料 

分 类 号：TU441[建筑科学—岩土工程]