中南大学学报（自然科学版）2018，Vol.49Issue(4)：957-963,7.DOI:10.11817/j.issn.1672-7207.2018.04.025
含裂隙类岩石注浆加固后破坏试验研究
Experimental study on failure of cracked rock-like material after grouting reinforcement
摘要
Abstract
Using white cement as the rock-like materials, the specimens in which the cracks were arranged through pre-installed steel slice were produced. The epoxy resin toughened by dibutyl phthalate (DBP) was used to carry out grouting reinforcement. The failure mechanism of the multi cracks specimens after grouting reinforcement was revealed through strain field analysis of the crack tip. The results show that the crack initiates in the same position for specimen before and after grouting reinforcement. The crack angle of specimens without grouting is perpendicular to the original crack plane and the crack of specimens after grouting is vertically penetrated through the whole specimen from the crack initiation position which is similar to the un-cracked specimen. The grouting reinforcement can effectively restrain the stress concentration of the crack tip and enhance the integrity of the specimen. The first cracks initiate when the maximum principal strain at the crack tip of single crack specimen reaches its critical value and then stress redistribution occurs. After grouting reinforcement, the maximum principal strain increase with a relatively flat trend and the failure occur because of the deformation imbalance between the rock like materials and the fracture fillings. For double cracks specimen without grouting, a penetrating crack occur in the ligament region because the maximum principal strain reaches critical value after the first crack initiates and Mode I fracture occurs. For double cracks specimen after grouting, the tensile strains almost reach their maximum value at the same time. The grouting reinforcement can avoid the formation of stress redistribution and strengthen the integrity of the specimen. The main factors of the grouting effect are the strength of the grouting material and its bonding properties.关键词
注浆加固/裂隙/破坏机理/应变分析/类岩石Key words
grouting reinforcement/crack/failure mechanism/strain analysis/rock-like materials分类
建筑与水利引用本文复制引用
王志,李龙,王朝雅..含裂隙类岩石注浆加固后破坏试验研究[J].中南大学学报（自然科学版）,2018,49(4):957-963,7.基金项目
国家自然科学基金资助项目(51404212) （51404212）
河南省高等学校青年骨干教师培养计划项目(2016GGJS-002)(Project(51404212) supported by the National Natural Science Foundation of China （2016GGJS-002）
Project(2016GGJS-002) supported by the Foundation for University Key Teacher by the Henan Educational Committee) （2016GGJS-002）
