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Abstract In order to study the effects of water-saturated state on crushed stone，the compaction tests on sandstone，mudstone and sandy mudstone from #3 coal seam roof of Yima Xin'an mine are conducted by using self-developed apparatus. The crushed stones are in two different conditions，one is natural and the other is water-saturated. The compaction stress is 27 MPa which is 1.5 times as high as the vertical geostress. Stress-strain relations of six particle sizes are obtained. Results show that the effects of water on crushed stones in different strengths are varied；the influenced degree of crushed stones is related with rock strength and the degree is decreasing along with the following order：mudstone，sandy mudstone and sandstone. The compaction property of small particle size is easier influenced by water compared with large ones. The rock strength has negative correlation with decreasing amplitude of residual bulking factor，residual void ratio and compactness respectively，and it also has good linear relation with each residual parameter. Compared with natural crushed stone，the parameters of water-saturated crushed stones all decreased such as residual bulking factor，residual void ratio and compactness；the decrease amplitudes of residual bulking factor for mudstone，sandstone and sandy mudstone are 14.21%，9.24% and 11.10%，respectively；and those of compactness are 9.47%，5.05% and 8.56%，respectively.
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Received: 18 June 2012
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2014, Vol. 33 
