岩土工程学报2026，Vol.48Issue(3)：619-631,13.DOI:10.11779/CJGE20241033
不同岩体交叉裂隙结构下滴状流的分流机理研究
Study on diversion mechanism of drip flow in different rock mass intersection fracture structures
摘要
Abstract
Fractured geomaterials contain complex networks of natural fractures that influence hydro-mechanical behaviors through unsaturated flow.This study investigates droplet dynamics at fracture intersections using phase-field modeling,focusing on geometric controls(aperture ratio,tilt angle,and intersection angle)about splitting behavior.XGBoost-based feature importance analysis reveals the relative impacts of these parameters.Validated against experimental data,the work identifies four distinct flow regimes:complete splitting,partial splitting(with/without dragging),and non-splitting.When the droplet length is 2 cm,increasing the fracture aperture ratio Wb,the tilt angle α of the fracture relative to the horizontal plane,and the intersection angle β leads to a decrease in the droplet splitting ratio η,and in some cases,no splitting occurs.At the condition Wb>0.4,a noticeable dragging phenomenon is observed;at the condition 20ο≤α≤35ο,the droplet completely splits into another channel;and at the condition α≤15ο,the droplet ceases to flow and gets stored in the fracture at the intersection.Feature importance analysis reveals that the tilt angle α of the fracture relative to the horizontal plane and the intersection angle β have a far greater impact on droplet splitting behavior than the aperture ratio Wb.The model is then extended to a fracture network structure to analyze the unsaturated infiltration of surface water in fracture systems in nature.It is found that unsaturated flow phenomena caused by the"blocking effect"of air in the fractures are common.The"preferred channel"chosen by the droplet is closely related to factors such as the straightness and flow area between the inlet and outlet of the channels.These results provide theoretical insights and methodological references for simulating flow in fractured structures and design engineering solutions involving random fractures.关键词
交叉裂隙/滴状流/动态分流行为/随机裂隙结构Key words
intersecting fractures/drip flow/dynamic diversion behavior/random fracture structure分类
建筑与水利引用本文复制引用
郭涛,李富春,陈彦州,李华仙..不同岩体交叉裂隙结构下滴状流的分流机理研究[J].岩土工程学报,2026,48(3):619-631,13.基金项目
国家自然科学基金项目(52369017,51969009) （52369017,51969009）
云南省"兴滇英才支持计划"青年人才项目(XDYC-QNRC-2022-0106)This work was supported by National Natural Science Foundation of China(Grant Nos.52369017,51969009)and Xingdian Talent Support Program of Yunnan Province(Grant No.XDYC-QNRC-2022-0106). （XDYC-QNRC-2022-0106）
