ANALYTICAL AND EXPERIMENTAL STUDY OF WATER SEEPAGE PROPAGATION BEHAVIOR IN THE FAULT

Coal mine water inrush has an impartible relationship with the fracture zone such as faults, which deeply threaten the safety production in China. In order to study the water seepage behavior in the fault and the impermeability of the fault when water inrush through fault occurs, some water inrush cases through faults were analyzed, and water injection tests which drilled one injection borehole and one observation borehole into the fault zone were carried out at one coal mine. The breakdown pressure, reopening pressure, as well as the initial water seepage pressure, impermeability and the initial hydraulic conductivity of Puzizhier fault, were obtained from the result of the water injection tests. The study shows that water seepage in faults goes through three stages which consist of pore flow, fracture flow and pipe flow. It shows a process of the fine particulates and existing in-fill in the fault zone washing out and original and newborn cracks expanding and connecting. The results of water injection tests can be thought to show the fault healing effect under the underground pressure. In addition, the risk of water inrush through faults owes a great deal to the characteristic of water source. ARTICLE INFO

[1]  Wang Lian-guo.  Modeling and microseismic monitoring of damage and failure evolution of faulty coal seam floor , 2013 .

[2]  Hu Yao-qing.  Solid-liquid coupling study on water inrush through faults in coal mining above confined aquifer , 2007 .

[3]  Ravendra Singh,et al.  Study of Mine Water Inrush from Floor Strata through Faults , 2001 .

[4]  Wanfang Zhou,et al.  Application of the Analytic Hierarchy Process to Assessment of Water Inrush: A Case Study for the No. 17 Coal Seam in the Sanhejian Coal Mine, China , 2013, Mine Water and the Environment.

[5]  Haibo Bai,et al.  Mechanical behavior of groundwater seepage in karst collapse pillars , 2013 .

[6]  Mao Xian-biao,et al.  RESEARCH ON EFFECT OF FAULT DIP ON FAULT ACTIVATION AND WATER INRUSH OF COAL FLOOR , 2009 .

[7]  Li Wen-ping,et al.  Experimental study on the conversion from seepage to flow of water inrush aroused by fault activation in fully mechanized top-coal caving , 2013 .

[8]  Wang Gui-bin.  Application of high water-pressure test to deep borehole , 2005 .

[9]  Zhaoping Meng,et al.  A geological assessment method of floor water inrush risk and its application , 2012 .

[10]  C. Ku,et al.  An empirical model for estimating hydraulic conductivity of highly disturbed clastic sedimentary rocks in Taiwan , 2009 .

[11]  Moon-su Kim,et al.  Relationship between hydraulic conductivity and fracture properties estimated from packer tests and borehole data in a fractured granite , 2007 .

[12]  Mingyu Wang,et al.  Investigations of groundwater bursting into coal mine seam floors from fault zones , 2004 .

[13]  Zhen Huang,et al.  Characterizing the hydraulic conductivity of rock formations between deep coal and aquifers using injection tests , 2014 .

[14]  Ming Li,et al.  Risk assessment of floor water inrush in coal mines based on secondary fuzzy comprehensive evaluation , 2012 .

[15]  Y. Kitagawa,et al.  Temporal change in permeability of the Nojima fault zone by repeated water injection experiments , 2007 .

[16]  Yu Wu,et al.  In-situ stress measurements and stress distribution characteristics in underground coal mines in China , 2010 .

[17]  Dejin Xu.  Advances in the Research on Mechanisms of the Groundwater Inrush Caused by the Fault Reactivation in Coalmines , 2011 .

[18]  Feng Shurong.  HIGH PRESSURE PERMEABILITY TEST ON HYDRAULIC TUNNEL WITH STEEP OBLIQUITY FAULTS UNDER HIGH PRESSURE , 2007 .

[19]  Wu Qiang,et al.  The numeric simulations of water-bursting time-effect for faults in Zhaogezhuang Coal Mine, Kailuan, China , 2002 .

[20]  Yan Jin,et al.  Analysis of fracture propagation behavior and fracture geometry using a tri-axial fracturing system in naturally fractured reservoirs , 2008 .

[21]  Zhou Rui.  TIME EFFECT OF WATER BURSTING IN FAULT RUPTURE ZONE , 2000 .

[22]  A. Mukai,et al.  Secular change of permeability in the fracture zone near the Nojima fault estimated using strain changes due to water injection experiments , 2007 .

[23]  I. Antigüedad,et al.  Hydraulic conductivity characterization of a karst recharge area using water injection tests and electrical resistivity logging , 2011 .

[24]  J. Cherry,et al.  Using constant head step tests to determine hydraulic apertures in fractured rock. , 2011, Journal of contaminant hydrology.

[25]  Sun Ru-hua.  Theoretical and Experiment Study on Vadose Conversion of Water Inrush Later Occurred from Structure Broken Zone , 2011 .