基于FLAC^(3D)数值模拟的水力压裂影响区域应力特征分析  

Stress Characteristics Analysis of Hydraulic Fracturing Influenced Zone Based on FLAC^(3D) Numerical Simulation

作　　者：张林良[1,2] 

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《煤矿安全》2015年第10期190-192,共3页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51144006);国家重点基础研究发展计划(973计划)资助项目(2012CB723104)

摘　　要：针对在井下实施水力压裂过程中会产生应力的重新分布的问题,并可能会影响到采掘面的安全生产,为了更深一步的了解水力压裂过程中和结束后煤岩体中的应力分布特征,采用FLAC3D模拟软件对水力压裂过程中应力变化进行了研究。通过井下水力压裂FLAC3D数值模拟表明,压裂孔两侧本来的应力升高区域地应力大大降低,压裂影响范围内应力降低、出现卸压区,这对消除煤与瓦斯突出危险性十分有利;同时也发现了井下水力压裂存在的缺陷,在裂隙前端也将伴随新的应力集中出现,这给工作面的安全开采带来了安全隐患。For the problem that the implementation of hydraulic fracturing in the shaft will produce stress redistribution and affect the safe production in mining face,in order to further understand the hydraulic fracturing process and characteristics of stress distribution of coal and rock,the simulation software FLAC3 Dis adopted to study stress variation in the process of hydraulic fracturing. The down hole hydraulic fracturing FLAC3 Dnumerical simulation show that the pressure in the ground stress is greatly reduced,on both sides of the original stress increased drilling on both sides of the displacement of coal occurrence and z direction,scope of fracturing effect reduce internal stress,appear unloading area,it is good for eliminating coal and gas outburst danger; the flaws of the down hole hydraulic fracturing is also found; the fracture tip will appear with the new stress concentration,which brings potential safety hazard for the working face.

关 键 词：水力压裂 煤岩体破坏 数值模拟 应力集中 裂隙前端 应力特征 

分 类 号：TD713[矿业工程—矿井通风与安全]