(1. Anhui Province Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. School of Resource and safety Engineering，Anhui University of Science and Technology，Huainan，Anhui 232001，China；3. Huainan Coal Mining(Group) Co.，Ltd.，Huainan，Anhui 232001，China)
Using the coal preparation equipment developed by ourselves，experiments on mechanical characteristics of soft coal were studied under different moisture content and clay content with the help of RMT–150B rock mechanics test system. The results showed that：(1) when the moisture content range from 1.59% to 6.50% in the test，critical moisture content is existed under the same clay content of the soft coal，the compressive strength of coal is the highest and the modulus of elasticity is the maximum at the level of the critical moisture. (2) The compressive strength and elastic modulus of the soft coal content were firstly increased and then decreased and the highest clay content are all about 11.68% under different moisture content when clay content increased from 4.00% to 19.36%. (3) In the same conditions，with the increase of water content and clay content，the brittleness of soft coal decreases while the ductility increases，the poisson ratio also increases. (4) The liquid bridge force of soft coal inter particles with the change of moisture content is the main reason for the evolution of the concept of mechanical behavior，the appropriate amount of clay particles can be used as cement to further strengthen the coal. The research results have important theoretical significance and engineering application value for the safe and efficient mining of soft coal seam.
王家臣. 极软厚煤层煤壁片帮与防治机制[J]. 煤炭学报，2007，32(8)：785-788.(WANG Jiachen. Mechanism of the rib spalling and the controlling in the very soft coal seam[J]. Journal of China Coal Society，2007，32(8)：785-788.(in Chinese))
[2]
刘生优，姚强岭. 近距离煤层大采高综放开采技术[J]. 采矿与安全工程学报，2008，25(3)：347-351.(LIU Shengyou，YAO Qiangling. Fully-mechanized top coal caving mining technology with great mining height in close-distance seams[J]. Journal of Mining and Safety Engineering，2008，25(3)：347-351.(in Chinese))
[3]
朱传奇. 类土质煤岩体力学特征及改良实验研究[硕士学位论文][D]. 淮南：安徽理工大学，2014.(ZHU Chuanqi. Study on mechanical characteristics and improved experiment of similar soil coal and rock mass[M. S. Thesis][D]. Huainan：Anhui University of Science and Technology，2014.(in Chinese))
[4]
王春华，曲 辉，许瀚文，等. 含水率对煤冻黏强度的影响[J]. 煤炭学报，2015，40(9)：2 213-2 217.(WANG Chunhua，QU Hui，XU Hanwen，et al. Influence of moisture content on coal freezing adhesive strength[J]. Journal of China Coal Society，2015，40(9)： 2 213-2 217.(in Chinese))
[5]
WANG W，ZHANG J S，YANG S，et al. Experimental study on the angle of repose of pulverized coal[J]. Particuology，2010，8(5)：482-486.
[6]
刘炯天，张明青，曾 艳. 不同类型黏土对煤泥水中颗粒分散行为的影响[J]. 中国矿业大学学报，2010，39(1)：59-63.(LIU Jiongtian，ZHANG Mingqing，ZENG Yan. Effects of different type clays on the dispersion of fine particles in coal slurry[J]. Journal of China University of Mining and Technology，2010，39(1)：59-63.(in Chinese))
[7]
许延春. 含黏砂土流动性试验[J]. 煤炭学报，2008，33(5)：496-499.(XU Yanchun. Fluidity test on sand blended with clay[J]. Journal of China Coal Society，2008，33(5)：496-499.(in Chinese))
[8]
陈中学，汪 稔，胡明鉴，等. 黏土颗粒含量对蒋家沟泥石流启动影响分析[J]. 岩土力学，2010，31(7)：2 197-2 201.(CHEN Zhongxue，WANG Ren，HU Mingjian，et al. Study of content of clay particles for debris flow occurrence in Jiangjia Ravine[J]. Rock and Soil Mechanics，2010，31(7)：2 197-2 201.(in Chinese))
[9]
肖文联，赵金洲，李 闽，等. 富含黏土矿物的低渗砂岩变形响应特征研究[J]. 岩土力学，2012，33(8)：2 444-2 450.(XIAO Wenlian，ZHAO Jinzhou，LI Min，et al. Deformation response characteristics of low-permeability and rich-clay sandstones[J]. Rock and Soil Mechanics，2012，33(8)：2 444-2 450.(in Chinese))
[10]
金银富，张爱军，尹振宇，等. 矿物成分相关的黏土一维压缩特性分析[J]. 岩土工程学报，2013，35(1)：131-136.(JIN Yinfu，ZHANG Aijun，YIN Zhenyu，et al. One-dimensional compressibility of soft clay related to clay minerals[J]. Chinese Journal of Geotechnical Engineering，2013，35(1)：131-136.(in Chinese))
[11]
于德海，彭建兵. 黏土矿物对金盆水库软弱变质岩边坡失稳影响研究[J]. 水土保持通报，2009，29(5)：45-49.(YU Dehai，PENG Jianbing. Influence of clay minerals on instability of soft metamorphic rock slope in Jinpen Reservoir[J]. Bulletin of Soil and Water Conservation，2009，29(5)：45-49.(in Chinese))
[12]
李增学. 煤矿地质学[M]. 北京：煤炭工业出版社，2009：200-203.(LI Zengxue. Mining geology[M]. Beijing：Coal Industry Press，2009：200-203.(in Chinese))
[13]
朱传奇，殷志强，范 浩，等. 一种型煤制样模具[P]. 中国：ZL201620108063.3，2016-07-06.(ZHU Chuanqi，YIN Zhiqiang，FAN Hao，et al. A type of coal sample mould[P]. China：ZL201620108063.3，2016-07-06.(in Chinese))
[14]
孙 闯，张向东，李永靖. 深部软弱岩体峰后等效力学模型及数值计算研究[J]. 岩土工程学报，2014，36(6)：1 113-1 121.(SUN Chuang，ZHANG Xiangdong，LI Yongjing. Equivalent mechanical model for post-peak behaviors of deep soft rock and numerical computation[J]. Chinese Journal of Geotechnical Engineering，2014，36(6)：1 113-1 121.(in Chinese))
[15]
孙 闯，张树光，贾宝新，等. 花岗岩峰后力学特性试验与模型研究[J]. 岩土工程学报，2015，37(5)：847-852.(SUN Chuang，ZHANG Shuguang，JIA Baoxin，et al. Physical and numerical model tests on post-peak mechanical properties of granite[J]. Chinese Journal of Geotechnical Engineering，2015，37(5)：847-852.(in Chinese))
[16]
康天合，张建平，白世伟. 综放开采预注水弱化顶煤的理论研究及其工程应用[J]. 岩石力学与工程学报，2004，23(15)：2 615- 2 621.(KANG Tianhe，ZHANG Jianping，BAI Shiwei. Theoretical study and application of weakening top coal using water pre-infusion in fully mechanized sublevel caving mining[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(15)：2 615-2 621.(in Chinese))
[17]
刘海红，李玉星，王武昌，等. 天然气水合物颗粒间液桥力的理论研究[J]. 天然气工业，2013，33(4)：109-113.(LIU Haihong，LI Yuxing，WANG Wuchang，et al. A theoretical study of liquid bridge force between nature gas hydrate particles[J]. Natural Gas Industry，2013，33(4)：109-113.(in Chinese))
[18]
孙其诚，王光谦. 颗粒物质力学导论[M]. 北京：科学出版社，2009：45-58.(SUN Qicheng，WANG Guangqian. An introduction to granular material mechanics[M]. Beijing：Science Press，2009：45-58.(in Chinese))
2017, Vol. 36 
