摘要
为了研究围压与渗透压差对灰岩渗透性影响,通过水—力耦合试验对不同条件下的岩石破坏过程的渗透性进行了测定。结果表明:在岩块破坏之前的压缩、变形阶段,岩石渗透率低,难以测出;在岩块达到峰值强度后,渗透率突增,在应变软化阶段渗透率最大;随着围压的增高渗透率减小,高围压状态下围压对灰岩渗透率的影响程度降低;随着渗透压差的增加,灰岩渗透率增大,高围压状态下,渗透压差对渗透率的影响程度较弱,试块的破坏位置集中在进水端位置附近。研究成果有助于深化对深部开采高地应力高水压条件下突水演化过程的认识。
In order to study the influence of confining pressure and osmotic pressure on rock permeability,permeability tests during whole stress strain processes were conducted under different coupling condition. The results showed that permeability values of the compression and deformation phases were too small to be measured. Rock permeability was increased to maximum at the softening phase after rock specimen failure. With the increase of osmotic pressure difference,the permeability of limestone increases. Under the condition of high confining pressure,the influence of osmotic pressure difference on permeability is weak. Influence degrees from confining pressure and osmotic pressure to permeability were reduced under high confining pressure condition. Rock specimen failure positions were concentrated near the water inlet. The research results can help to understand the coal seam floor water inrush process under high crustal stress and hydraulic pressure condition.
作者
刘再斌
Liu Zaibin(Xi＇an Research Institute Company of China Coal Technology and Engineering Group,Xi＇an 710054,China;School of Environmental Science and Engineering of Chang＇an University,Xi＇an 710054,China)
出处
《能源与环保》
2018年第6期31-34,39,共5页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家重点研发计划(2017YFC0804102)
中煤科工集团西安研究院有限公司科技创新基金面上项目(2015XAYMS17)
关键词
渗透性
瞬态法
围压
渗透压差
岩石破坏
perrmeability
transient test method
confining pressure
osmotic pressure difference
rock failure
