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Abstract In order to study the characteristics of interaction process between deep rock of lower coal seam floor and water in Jibei mining area，five different types of rocks are used for water stability test in laboratory by natural water and saturated salt water soaking. Through water stability test and conductivity measuring for 52 days，the results are drawn as follows. (1) The water stability of nature soaked rocks is good，and none of them have basic degradation according to phenomena and test results of 20 samples in dropping residue，superficial cranny，rock cracking，strength change，swelling and degradation. However，the samples have obvious degradation by wetting- drying cycle effect. (2) There are three phases to conductivity increasing range in natural water by normal condition and wetting-drying cycle effect，but the conductivities of same sample under different conditions show big difference in increasing over time. The conductivity in wetting-drying cycle effect is obviously larger. (3) It is positive relevance between rock conductivity and decreasing rate of mass. The study results provide references for micro-mechanism study of deterioration for rocks under water-rock interaction in the deep coal mining.
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Received: 20 December 2012
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2014, Vol. 33 
