摘要
本文聚焦碳酸盐岩微观渗流特性与破裂机制的研究,开展了岩石破裂过程中管道-裂隙水流动可视化试验,基于岩石块体尺度试验结果定量分析管道流体向裂隙流体过渡的流态演化过程,研究多级荷载对管道-裂隙水流动特性的影响。试验结果表明:碳酸盐岩流态稳定性与破裂状态相关,管壁破坏初期管道流主要以层流为主,局部管壁劈裂造成管道流体时域性流态交替,管道流体向裂隙流体转变的前兆特征主要表现为过渡流态临界转换点。碳酸盐岩破裂过程中管道流体向裂隙流体过渡过程具有分数演化特征,分数指数能够定量刻画管流和裂隙流的临界过渡过程。
This study focus on nonlinear flow properties of pipe-fissure water in carbonate rocks during failures.A visible flow experiment was carried out to observe pipe-fissure water during rock failures.Flow transition patterns of pipes and fissures water were quantitatively described according to the experiment data of flows in rocks under multi-level loading.The results show that the pipe fluid pattern is closely related to the roughness of the pipe-wall.The laminar flow at primarily cracks changes gradually into the transition flow at broken rocks.Pipe spalling can induce fluid pattern alternation with time duration.The precursory characteristics of transition fluid patterns of the pipe and fissure express as the critical point of flows.Pipe flow transforms into fissure flow with a feature of fractional evolution during carbonate rocks failure.The fractional index can be quantitatively used to define the critical transition process of the pipe into fissure flow.
作者
孙欢
刘晓丽
王恩志
刘驰
张建民
SUN Huan;LIU Xiaoli;WANG Enzhi;LIU Chi;ZHANG Jianmin(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;College of Civil Engineering and Architecture,Hainan University,Haikou,Hainan 570228,China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2020年第4期500-508,共9页
Carsologica Sinica
基金
国家重点研发计划项目(2018YFC1504801)
中国博士后科学基金项目(2018M641370)
海南大学科研基金资助项目(KYQD(ZR)-20104)。
关键词
碳酸盐岩
管道破裂
裂隙水
非线性流动
分形演化
carbonate rocks
pipe rupture
fissure water
non-linear flow
fractal evolution
