翟新献, 刘勤裕, 赵晓凡,等.不同含水率煤样单轴动态压缩力学性质试验研究[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787. 2021120121

ZHAI X X, LIU Q Y, ZHAO X F, et al.Experimental study on mechanical properties of coal specimens withdifferent moisture contents under uniaxial dynamic compression[J].Journal of Henan Polytechnic University(Natural Science) ,doi:10.16186/j.cnki.1673-9787. 2021120121

不同含水率煤样单轴动态压缩力学性质试验研究(网络首发)

翟新献, 刘勤裕, 赵晓凡, 任柱安, 郭钊洋

河南理工大学 能源科学与工程学院，河南 焦作 454000

摘要:目前巷道煤层注水是预防综放开采煤岩体冲击地压的有效技术措施之一。利用义马矿 区耿村煤矿综放工作面煤样，在室内进行煤样吸水性试验后，制作成不同含水率的圆柱形煤 样，进行霍普金森（SHPB）冲击压缩试验，研究冲击速度和含水率对煤样动态力学性质的影响。 结果表明：（1）煤样含水率与浸水时间成正相关。按照含水率-浸水时间曲线拐点，将煤样浸水 过程划分为2个阶段即前期和后期浸水阶段。（2）煤样动态力学参数均与煤样冲击速度和含水 率有关。当煤样含水率一定时，随着冲击速度增大，煤样动态抗压强度和动态弹性模量均与冲 击速度成正相关；当煤样冲击速度一定时，随着含水率升高，煤样动态抗压强度和动态弹性模 量均与含水率成负相关。（3）根据屈服强度和峰值强度，将煤样单轴动态应力-应变全过程划分 为3个变形阶段即弹性阶段、屈服阶段和应变软化阶段，回归出煤样各阶段应力-应变拟合方 程。研究结果为冲击地压矿井深孔煤层注水防冲措施的实施和应用提供了参考。

关键词:煤样;冲击速度;含水率;SHPB;动态力学性质

中图分类号:TD315

doi:10.16186/j.cnki.1673-9787. 2021120121

基金项目:国家自然科学基金资助项目（52074102，52109081）

收稿日期:2021-12-30 00:00:00

修回日期:2022-06-06 00:00:00

网络首发日期:2023-04-13

Experimental study on mechanical properties of coal specimens withdifferent moisture contents under uniaxial dynamic compression（Online）

ZHAI Xinxian, LIU Qinyu, ZHAO Xiaofan, REN Zhu’an, GUO Zhaoyang

School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract:At present，coal seam water injection in gateway is one of the effective technical measures to prevent coal bumps in longwall top coal caving mining. Raw coal samples were selected in the coal face of Gengcun Coal Mine in Yima mining area，China. The water absorption tests of coal specimens were carried out at laboratory，and cylindrical specimens with different moisture contents were made. SHPB dynamic impact compression tests were carried out. The influences of impact velocities and moisture contents of specimens on their dynamic mechanical properties were studied.The test results show that：（1）The moisture contents of specimens are positively correlated with their absorption times. Bound on the inflection points of water content-soaking time curves，the soaking process of specimens is divided into two stages，i.e.，the early absorption stage and the later absorption stage.（2）The dynamic mechanical parameters of specimens are related to their impact velocities and moisture contents.While the moisture contents of specimens are constant，dynamic compressive strength and dynamic elastic modulus are positively correlated with their impact ve⁃locities.While the impact velocities of specimens are constant，dynamic compressive strength and dynamicelastic modulus are negatively correlated with their moisture contents.（3）According to the yield strength and peak strength of specimens，the whole uniaxial dynamic stress-strain process of the specimens is divided into three deformation stages，namely，the elastic stage，the yield stage，and the strain softening stage.The stress-strain fitting equation for each stage of the specimens was regressed.The conclusions can providereference for the implementation and application of the measures of coal seam water injection by deep bore⁃holes to prevent coal bumps in coal mines.

 Key words:coal specimen;moisture content;dynamic load;SHPB;dynamic mechanical property

CLC:TD315