摘要
利用3D打印技术制作出30个含10级粗糙度(JRC=1~20)、3种厚度(1.5、3.0、5.0mm)的裂隙插片,通过模具浇筑成贯通充填裂隙类岩石试件,并对所制备的试件开展渗透性试验,研究在不同围压水平下不同粗糙度、不同隙宽贯通充填裂隙的渗流特性。试验结果表明:(1)不同粗糙度和隙宽贯通充填裂隙渗透率均随围压增加而减小,且在围压加载初期,裂隙渗透率的降低速度明显要高于围压加载中后期,最大渗透率降差达到78%。(2)围压加载初期,隙宽较小时,裂隙渗透率有随粗糙度增加而减小的趋势,且离散性较大;随着围压和隙宽的增加,粗糙度对裂隙渗透性的影响迅速减小。(3)对于10级不同粗糙度贯通充填裂隙,围压加载过程中,均有隙宽越大,裂隙渗透率越大的规律;且在围压较小时,粗糙度越大,不同隙宽贯通充填裂隙渗透率的差值越大,但随着围压的升高,这种影响逐渐被消除。(4)围压对贯通充填裂隙渗透率的影响处于主导地位,两者之间的关系可用幂函数进行描述。
30 joint-slices with 10 grades of roughness(JRC=1~20)and 3 kinds of thickness (1.5,3.0,5.0 mm) are produced by using 3D printing technology,and then poured into rock-like specimens containing consecutive and filling fracture by moulds.Then the seepage tests are carried out on these specimens with different roughness levels and gap-widths under different confining pressures. The test results show that the permeability of consecutive and filling fracture with different roughness levels and gap-widths decreases with the increase of confining pressure.Moreover,the decrease rate of permeability in the initial stage of confining pressure loading is obviously higher than that in the middle and late periods,and the maximum permeability drop is 78%.In the initial stage of confining pressure loading,when the gap-width is small,the roughness has a great influence on the seepage characteristic of consecutive and filling fracture.While,as the gap-width and confining pressure increase,the effect of the roughness on the fracture permeability rapidly decreases.For all consecutive and filling fracture with 10 grades of roughness,the permeability increases with the increase of the gap-width in the initial and late stages of confining pressure loading.When the confining pressure is small,the larger the roughness is,the greater difference the permeability of consecutive and filling fracture at different gap-widths has.However, with the increase of confining pressure,the difference is gradually reduced.The confining pressure have a dominant influence on the permeability of consecutive and filling fracture,and their relationship can be described by a power function.
作者
王鹏飞
谭文辉
马学文
李子建
刘景军
武洋帆
WANG Peng-fei;TAN Wen-hui;MA Xue-wen;LI Zi-jian;LIU Jing-jun;WU Yang-fan(Key Laboratory of Ministry of Education for Efficient Mining and Safety ofMetal Mine,University of Science and Technology Beijing,Beijing 100083,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2019年第8期3062-3070,共9页
Rock and Soil Mechanics
基金
国家重点研发计划(No.2017YFC0804103)
国家自然科学基金(No.11572344)~~
关键词
贯通充填裂隙
围压加载
粗糙度
隙宽
渗流特性
consecutive and filling fracture
loading of confining pressure
joint roughness coefficient(JRC)
gap-width
seepagecharacteristic
