Mechanical Analysis on Fault Water Inrush above Floor Confined Aquifer
PAN Rui
MENG Xiangrui
GAO ZHaoning
Abstract： A simplified mechanical model was built according to the stress characteristics of fault above floor confined aquifer,the analytic formula for the normal stress and shear stress on the fault plane was obtained according to the elasticity and a detailed analysis was made on the change of the shear stress on the fault plane which was affected by the dip angle of fault and the distance of face advance. Based on the theory of key water-resisting layer,the formula for the critical water pressure which was affected by the fault was derived and analysis was carried out on the change of the critical water pressure with the dip angle of fault. The results showed that the peak shear stress on the shear plane increased with the increase of the dip angle when β<60oand decreased with the increase of the dip angle whenβ>60o. The peak shear stress was gradually transferred to the shallow part with the working face advanced to the fault. With the increase of the dip angle, the critical water pressure experienced such a process of first increase and then decrease. The key water-resisting layer may break and form another water inrush channel when the dip angle of fault was β<40o or β>65o.
Keywords：confined aquiferfaultshear stresskey water-resisting layercritical water pressure
Publication Date：2013-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 11-15 )