摘要
针对破岩工程中定向致裂的问题,首先分析了多孔线性协同定向水压致裂技术原理,然后采用RFPA2D-Flow数值模拟软件对多孔线性协同定向水力致裂试验结果进行验证,最后研究了多孔线性协同定向水压裂缝的起裂和扩展规律。结果表明:RFPA2D-Flow数值模拟结果与试验结果趋于一致;多孔线性协同定向水力致裂的过程可以分为注水升压、水压裂缝的起裂、裂缝稳定扩展和裂缝贯通4个阶段;在裂缝传播过程中,裂缝扩展朝向钻孔分布的方向。不同钻孔在水压裂缝扩展过程中存在相互影响,导致水压裂缝扩展贯通。
Aiming at the problem of directional fracturing in rock breaking engineering,the multi-hole linear co-directional hydraulic fracturing technology was proposed.At first,the principle of this technology was analyzed,then its experimental results were verified by RFPA2 D flow numerical simulation software,and finally the initiation and propagation laws of fractures were studied.The results are concluded as follows.Firstly,the numerical simulation results of RFPA2 D-Flow are consistent with the experimental results.Secondly,the process of multi-hole linear co-directional hydraulic fracturing can be divided into four stages,including water injection and pressure rise,hydraulic fracture initiation,stable fracture propagation and fracture penetration.Thirdly,in the process of fracture propagation,the fracture expands towards the direction of borehole distribution.Different boreholes have mutual influences in the process of hydraulic fracture propagation,resulting in propagation and penetration of hydraulic fractures.
作者
卢卫永
LU Weiyong(Department of Mining Engineering,Lv Liang University,Lvliang,Shanxi 033001,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第8期83-87,共5页
Mining Research and Development
基金
国家自然科学基金项目(51974105,51774111)
山西省高等学校科技成果转化培育项目(2020CG050)。
关键词
定向破岩
多孔线性
协同定向水力致裂
裂缝扩展
Directional rock breaking
Multi-hole linear
Co-directional hydraulic fracturing
Fracture propagation
