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| Study on water absorption characteristics and influencing factors of coal measures sedimentary rocks in Yixin coal mine |
| ZHANG Na1，2，WANG Shuaidong1，2，ZHANG Ziyun1，2，GUO Lin1，2，HUANG Can1，2，HE Manchao1，2 |
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Beijing 100083，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，
Beijing 100083，China) |
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Abstract Water absorption is one of the most important cause of deep soft rock deformation and failure. In this paper，X-ray diffraction，scanning electron microscopy and test of water-absorbing without pressure were carried out on deep soft rock samples in the Yixin coal mine. Water absorption characteristics and its influencing factors of rock samples in the study area are comprehensively analyzed. Results have shown that the patterns of the water absorption trends of the three types of rocks were all characterized by a similar kind of dynamic process with decreasing water absorption rate which could be well fitted by a negative exponential function. However，significant differences were found in water absorption ability among the three types of rock samples which could be sorted in an order of mudstone(0.74%)＞siltstone(0.56%)＞medium sandstone(0.27%). The content of clay minerals and fractal dimension have a significant effect on water absorption capacity，which all show a good positive correlation. There are obvious differences in the effect of different mineral compositions on the water absorption capacity. Illite can obviously promote the water absorption capacity，while quartz and kaolinite can inhibit the water absorption capacity.
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2022, Vol. 41 
