碾压混凝土层面拉伸破坏试验研究  

Experimental research on tensile failure process in rolled compacted concrete layer

作　　者：黄志强[1] 宋玉普[1] 王学志[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室

出　　处：《大连理工大学学报》2007年第3期387-391,共5页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(50179002)

摘　　要：碾压混凝土软弱层面的断裂破坏是高碾压混凝土坝稳定性研究的一个重要方面．对6种层面处理工况的碾压混凝土层面进行了楔入劈拉断裂试验研究，采用电测法测得碾压混凝土层面裂缝的起裂荷载，确定了碾压混凝土层面裂缝的双K断裂参数．研究表明，层面的起裂荷载与失稳荷载的比值Phini／Phun在57．7％～74．2％．在6种层面处理工况中，下层碾压混凝土终凝后施工缝或冷缝的处理方式，其所形成的层面的拉伸断裂参数最大，其断裂路径曲折，断裂面凹凸不平，因此这种层面处理方式最为有效．Research on failure of soft stratum of rolled compacted concrete （RCC） is an important aspect of stability of high RCC dam. Six kinds of specimens with different interfaces were investigated by wedge splitting method. Initial load of RCC surface was obtained by electrometric method, and then double K fracture parameters were determined. It is indicated that ratio of initial fracture parameter and unsteady fracture parameter Phini/Phon is 57. 7%-74. 2%. It is shown that the approach of construction joint or old joint after RCC final set is the most efficient among the six cases, and its fracture parameter is the biggest among them. Its propagation path is sinuous, and the failure surface is relief.

关 键 词：碾压混凝土 层面裂缝 楔入劈拉 起裂荷载 双K断裂参数 

分 类 号：TV313[水利工程—水工结构工程]