垫条宽度对堆石混凝土劈裂抗拉强度的影响  

Effect of Load Bearing Strip Width on Splitting Tensile Strength of Rock-Filled Concrete

作　　者：陈新孝 王志新 杨艳[2] 罗滔 CHEN Xinxiao;WANG Zhixin;YANG Yan;LUO Tao(Shaanxi Key Laboratory of Safety and Durability of Concrete Structures(Xijing University),Xian 710123,China;College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China)

机构地区：[1]陕西省混凝土结构安全与耐久性重点实验室(西京学院),西安710123 [2]西北农林科技大学水利与建筑工程学院,杨凌712100

出　　处：《硅酸盐通报》2025年第3期924-935,共12页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金青年项目(51909223);国家自然科学基金重点项目(52039005);陕西省教育厅青年创新团队科研计划项目(23JP182);西北农林科技大学科研启动基金项目(2452024068)。

摘　　要：为研究垫条宽度对堆石混凝土(RFC)劈裂抗拉强度的影响,构建了边长为600 mm的RFC立方体离散元模型,结合已有普通混凝土及RFC立方体试件劈裂抗拉强度试验的相关成果,探讨了大尺寸RFC立方体试件模型在劈裂抗拉强度试验中垫条宽度的合理取值问题。结果表明:当垫条宽度小于15 mm时(相对垫条宽度为0.025),RFC立方体试件在垫条轴线平面会发生局部剪切破坏;当相对垫条宽度为0.033时,垫条宽度对不同尺寸普通混凝土和RFC立方体试件劈裂抗拉强度的影响程度较接近;当相对垫条宽度大于0.042后,RFC立方体试件中堆石的骨架作用阻碍了裂纹的扩展,导致垫条宽度对RFC立方体试件劈裂抗拉强度的影响显著加大。建议大尺寸RFC立方体试件劈裂抗拉强度试验的相对垫条宽度按0.033取值。To investigate the impact of load bearing strip width on the splitting tensile strength of rock-filled concrete(RFC),a discrete element model of RFC cube with a side length of 600 mm was established.In combination with the existing relevant achievements of splitting tensile strength tests on ordinary concrete and RFC cube specimens,the reasonable value of load bearing strip width in the splitting tensile strength test for large-sized RFC cube specimens was explored.The results indicate that when the load bearing strip width is less than 15 mm(relative load bearing strip width is 0.025),local shear failure occurs near the load bearing strip for the RFC cube specimens.When the relative load bearing strip width is 0.033,the influence of the load bearing strip width on the splitting tensile strength of ordinary concrete and RFC cube specimens of different sizes is relatively close.When the relative load bearing strip width is greater than 0.042,the skeletal effect of rockfill in the RFC cube specimens hinders the crack propagation,resulting in a significant increase in the influence width of the load bearing strip on the splitting tensile strength of the RFC cube specimens.It is recommended that the relative load bearing strip width for the splitting tensile strength test of large-sized RFC cube specimens be taken as 0.033.

关 键 词：堆石混凝土 堆石骨架 垫条宽度 劈裂抗拉强度 离散元 

分 类 号：TV32[水利工程—水工结构工程]