三峡大学学报（自然科学版）2018，Vol.40Issue(3)：51-55,5.DOI:10.13393/j.cnki.issn.1672-948X.2018.03.011
混凝土水力劈裂时裂缝扩展与缝中水压力变化试验研究
Experimental Study of Variation of Crack Propagation and Water Pressure under Concrete Hydraulic Fracture
摘要
Abstract
A sealing device for testing concrete hydraulic fracture is improved in this paper.In order to avoid large deformation of silicon plates,silica gel set is used to sealing water instead of silicon plates to specimen using two specially designed clamps.A series of waterproof strain gauges are designed to record strain in the front of notched crack in the concrete specimen.Water pressures measured by four transducers and strains measured by five strain gauges are obtained in the crack propagation path simultaneously.The distributions of water pressure within crack are compared to the locations of crack propagation.The results indicate that the crack tip propagation speed is obviously increased with the increase of water pressure,while the failure load decreased evidently.Hydraulic front lags 10mm to the crack front at the beginning of crack propagation;and the distance between the hydraulic front and the crack front approaches 40mm when failure occurs.关键词
水力劈裂/裂缝扩展/水压力分布/应变Key words
hydraulic fracture/crack propagation/water pressure distribution/strain分类
建筑与水利引用本文复制引用
杜成斌,杨羿,陈玉泉,余磊..混凝土水力劈裂时裂缝扩展与缝中水压力变化试验研究[J].三峡大学学报（自然科学版）,2018,40(3):51-55,5.基金项目
国家自然科学基金项目(11372098,51579084) （11372098,51579084）
河海大学大学生创训项目(2017102941161) （2017102941161）
