Aquosity And Transmissibility Study Of F₁₀ Fault In Xinji No.1Mine

Large fault zone have characteristics of low intensity, easy to slideg and deforme, strong permeability, and poor anti-deformation capacity. The existence of large fault destroy the integrity of the stratum, the capacity of roof and floor rocks stability and bearing become variation, and influenced by coal bed mining disturbance, the expansion of the fault zone, the further development of secondary structure, are very easy to touch the aquifer, form water channel, affect the mine safety production. The theory analysis, field test, engineering exploration and numerical simulation are used in this paper, the property of water-bearing and activating to conduct water of F10fault have been systematically studied. The study have certain theoretical significance and reference value.Based on large-scale fault F10in xinji coal mine as the research background, from the aspects of the occurrence and evolution analysis, establish the nature of the fault and scale, realize relationship between the fault location and structure; and carry on test research on the stress distribution of fault zone and rock engineering geological characteristics.The analysis suggest that, the scope of the field value of maximum principal stress and minimum principal stress ratio between1.2to2.2, and a slight variation with depth tending to stability, reflecting the mining area tectonic stress is constant. Coal field stress is given priority to near EW horizontal principal stress, reflecting affected by extrusion, and stress value shift surface normal direction near the F10fault, which in turn fault near the end position show some tensile properties, stress release and value decrease slightly into two sets.Focus on fault activation caused by mining and the mechanical characteristics of water inrush, established the mechanics and numerical mechanism analysis model of fault activation, using FLAC3D and UDEC software to simulation calculate, the fault activation effect, the distribution regularity of stress and deformation and failure of surrounding rocks are came out by the mining depth, the fault dip angle, fault throw and stope advance step, mine pressure under the condition of multiple factors. According to drilling, geophysical prospecting and hydrofracturing test data, from the point of hydrogeology and engineering geology analyzed and the studied, combining simulation results, the comprehensive evaluation of F10fault is not water-bearing or weak water fault.