Next Article in Journal
Disruptive Technologies for Improving Water Security in Large River Basins
Previous Article in Journal
Descriptive Analysis of the Performance of a Vegetated Swale through Long-Term Hydrological Monitoring: A Case Study from Coventry, UK
Open AccessArticle

Study on Permeability Characteristics of Rocks with Filling Fractures Under Coupled Stress and Seepage Fields

by 1,2, 1,2,*, 1,2, 1,2, 1,2 and 3
1
Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
2
Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, China
3
State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210098, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(10), 2782; https://doi.org/10.3390/w12102782
Received: 13 September 2020 / Revised: 2 October 2020 / Accepted: 5 October 2020 / Published: 6 October 2020
(This article belongs to the Section Hydrology and Hydrogeology)
Infilling fractured rock masses are widely distributed in the deeply buried oil reservoirs and surrounding rocks of mine caves. The internal filling material has a great influence on the mechanical properties and seepage characteristics of fractured rock mass. In this paper, through theories and experiments, the mechanism of permeability changes of infilling fractured rock under a coupling condition is studied. In terms of theory, the fracture compaction effect coefficient δ is added to the classical matchstick model, and the volume strain principle is used to propose a permeability model for fractured rock. Furthermore, based on the Hertz contact theory, mineral particles are generalized into rigid spheres, and the mechanism of crack development between mineral particles under seepage pressure is analyzed. In terms of experiment, a true triaxial seepage test was carried out on rock-like specimens to obtain the change law of the permeability characteristics of fractured rock. The test results are largely consistent with the theoretical calculation results of the theoretical model, which verifies the applicability of the model proposed in this paper. After the loading failure of the specimen, the internal filling material was taken out and analyzed, and by observing the distribution of cracks on the surface, it is verified that the seepage pressure promotes the development of cracks in the filling fracture. View Full-Text
Keywords: fractured rock; permeability; true triaxial seepage test; permeability model fractured rock; permeability; true triaxial seepage test; permeability model
Show Figures

Figure 1

MDPI and ACS Style

Zhu, Z.; Niu, Z.; Que, X.; Liu, C.; He, Y.; Xie, X. Study on Permeability Characteristics of Rocks with Filling Fractures Under Coupled Stress and Seepage Fields. Water 2020, 12, 2782.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop