岩土工程学报Issue(7)：1165-1172,8.DOI:10.11779/CJGE201507001
压实黏土梁弯曲开裂性状试验研究
Experimental study on characteristics of bending cracks of compacted soil beams
摘要
Abstract
The waterproofing properties of compacted clay barrier at landfill site will be significantly weakened by cracks. To reveal the characteristics of bending cracks of compacted soil beams with different water contents, a bending test apparatus is developed. Then the process of crack propagation is investigated. The strain localization near the crack tip is analyzed using PIV technology, and cracking strain of compacted soil beams with different water contents is obtained. The experimental results show that many strain localization regions are observed in the tensile zone of the beam, and the strain localization region near the mid-span becomes the macroscopic crack. The crack width increases linearly with the growth of mid-span displacement, which is independent of the water content. However, the water content has great influence on the cracking characteristics and strain of the beam. As the water content increases from 32.6% to 37.0%, the crack deflection of the beam increases markedly, the area of strain localization near the crack tip expands, and cracking strain increases from 2.4% to 4.1%. Additionally, as the water content increases, the pattern of load versus the mid-span displacement changes from“snap back” to“skip through”, and the peak load decreases noticeably. It is indicated that the crack pattern of compacted soil beams changes from brittle fracture to ductile one.关键词
压实黏土/三点弯梁/裂纹扩展/开裂应变Key words
compacted clay/three-point bending beam/crack propagation/cracking strain分类
建筑与水利引用本文复制引用
凌道盛,徐泽龙,蔡武军,王云岗..压实黏土梁弯曲开裂性状试验研究[J].岩土工程学报,2015,(7):1165-1172,8.基金项目
国家重点基础研究发展计划（“973”计划）项目（2014CB047000）；浙江省自然科学基金面上项目（LY12E08011）；国家自然科学基金项目（51278451）；浙江省自然科学基金重点项目 （）
