摘要
采用室内水压致裂模拟装置,研究不同层理数量、预制裂纹角度、导向裂纹等对层状岩石复杂裂网扩展规律的影响,结合断裂力学理论对致裂效果评价。结果表明,注水孔周围水平方向主裂纹沿水平应力方向扩展,其他方向主裂缝延伸扩展至弱层理面并沿层理面向前发展;含导向裂纹、预制裂纹时,水平应力方向产生对称扩展的主裂缝,其他主裂缝贯穿弱层理面向前扩展;各个方向的应变曲线表明,岩石发生破坏分为应力累计、裂纹稳定扩展、失稳破坏3个阶段;适当减小应力差更易产生与天然裂隙沟通的复杂裂网。
The effect of different bedding number,prefabricated crack angle and guide crack on the propagation law of complex fracture network in layered rocks are studied by using hydraulic fracturing simulation device,and combining with fracture mechanics theory,the effect of cracking is evaluated.The results show that:(a)the horizontal main cracks around water injection holes propagate along horizontal stress direction,while other main cracks propagate to weak bedding plane and develop forward along bedding direction;(b)when there are guide cracks and prefabricated cracks,the main cracks propagate symmetrically in the direction of horizontal stress,while other main cracks propagate forward through weak bedding;(c)the strain curves in all directions show that the rock failure can be divided into three stages of stress accumulation,crack stable propagation and instability failure;and(d)with reducing the stress difference properly,there is more likely to produce complex crack networks which communicate with natural cracks.
作者
胡江春
孙发用
崔力
李渊
管毅
HU Jiangchun;SUN Fayong;CUI Li;LI Yuan;GUAN Yi(Zhongyuan University of Technology,Zhengzhou 451100,Henan,China;Sinohydro Bureau 11 Co.,Ltd.,Zhengzhou 450001,Henan,China)
出处
《水力发电》
北大核心
2019年第10期33-37,共5页
Water Power
基金
国家自然科学基金资助项目(51074196,51574296)
河南理工大学深部矿井建设省重点学科开放实验室开放基金项目(2014KF-03)
关键词
岩石断裂力学
重复压裂
复杂裂网
水平应力
rock fracture mechanics
repeated fracturing
complex fracture network
horizontal stress
