饱水对煤层顶板碎石压实特征影响的试验研究

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摘要为了研究饱水对煤层顶板碎石压实特征的影响，利用自制装置对义马新安矿3#煤层顶板泥岩、砂质泥岩和砂岩，在自然和饱水状态、压实应力为垂直应力1.5倍(27 MPa)条件下进行压实试验，得到3种岩石6种块径碎石压实试验的应力–应变关系。研究结果表明：水对不同强度碎石的作用不同，对低强度泥岩的作用较强，对高强度砂岩的作用较弱，中等强度砂质泥岩介于二者之间；水对小块径碎石压实性的影响程度要大于大块径；岩块强度与残余碎胀系数降幅、残余空隙率降幅以及压实度降幅均呈负相关，二者均具有良好线性关系；与自然状态相比，饱水后泥岩、砂岩和砂质泥岩的残余碎胀系数平均降幅依次为14.21%，9.24%和11.10%，压实度平均降幅依次为9.47%，5.05%和8.56%。

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关键词 ：岩石力学, 煤层顶板, 破碎岩石, 压实特征, 饱水状态, 碎胀系数, 空隙率

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.

Key words： rock mechanics roof of coal seam crushed stone compaction characteristics water-saturated state bulking factor void ratio

收稿日期: 2012-06-18

引用本文:

陈晓祥1，苏承东1，唐旭2，郭文兵1. 饱水对煤层顶板碎石压实特征影响的试验研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3318-3326.
CHEN Xiaoxiang1，SU Chengdong1，TANG Xu2，GUO Wenbing1. EXPERIMENTAL STUDY OF EFFECT OF WATER-SATURATED STATE ON COMPACTION PROPERTY OF CRUSHED STONE FROM COAL SEAM ROOF. , 2014, 33(sl): 3318-3326.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3318

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