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| Experimental study on tensile failure process of double-K fracture parameters in roller compacted concrete layer | |
| 作者姓名： | 黄志强 宋玉普 王学志 |
| 作者单位： | Physics Department Shenyang University of Technology，State Key Laboratory of Coastal Offshore Engineering Dalian University of Technology，Dept. of Civil Engineering，Liaoning University of Technology，Shenyang 110024 China State Key Laboratory of Coastal Offshore Engineering Dalian University of Technology Dalian 116023 China，Dalian 116023 China，Jinzhou 21001，China |
| 基金项目： | 国家自然科学基金，Liaoning Province Dr. Fund Opening Foundation of China |
| 摘 要： | Study on failure of soft stratum of roller 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. Double-K fracture parameters （initial fracture parameter and unsteady fracture parameter） were calculated by the concrete double-K fracture theory. It is indicated 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 largest among them. Its propagation path is sinuous. Its failure surface is scraggly. Bedding plane crack fails at the underside of the concrete surface, bond course or the surface between them for each approach. So disturbance on the underside of the concrete surface should be avoided or decreased at best during RCC construction. |
| 关 键 词： | 碾压混凝土 底层裂纹 裂纹发展 楔形裂缝 |
Experimental study on tensile failure process of double-K fracture parameters in roller compacted concrete layer |
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| HUANG Zhi-qiang,SONG Yu-pu,WANG Xue-zhi.Experimental study on tensile failure process of double-K fracture parameters in roller compacted concrete layer[J].Journal of Harbin Institute of Technology,2008,15(3):378-382. | |
| Authors: | HUANG Zhi-qiang SONG Yu-pu WANG Xue-zhi |
| Affiliation: | 1. Physics Department, Shenyang University of Technology, Shenyang 110024, China;State Key laboratory of Coastal Offshore Engineering, Dalian University of Technology, Dalian 116023, China 2. State Key laboratory of Coastal Offshore Engineering, Dalian University of Technology, Dalian 116023, China 3. Dept. of Civil Engineering,Liaoning University of Technology,Jinzhon 21001 ,China |
| Abstract: | Study on failure of soft stratum of roller 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. Double-K fracture parameters (initial fracture parameter and unsteady fracture parameter) were calculated by the concrete double-K fracture theory. It is indicated 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 largest among them. Its propagation path is sinuous. Its failure surface is scraggly. Bedding plane crack fails at the underside of the concrete surface, bond course or the surface between them for each approach. So disturbance on the underside of the concrete surface should be avoided or decreased at best during RCC construction. |
| Keywords: | RCC bedding plane crack wedge splitting double-K fracture parameters |
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