含水率对预制裂纹煤样能耗与破坏模式的影响
发布时间：2019-02-16 15:22
【摘要】：为研究注水对煤层破坏特性的影响,开展煤样单轴压缩试验,观察不同含水率预制裂纹型煤试件的能耗及破坏模式。结果表明:随着含水率的增加,煤样单轴抗压强度和弹性模量均以负指数函数方式下降;煤样积聚的总能量、存储的弹性能和破坏的耗散能均随含水率以二次抛物线递减函数方式减小;煤样中预制裂纹产生起裂点所需轴向应力和峰值应力随含水率逐渐减小;试样破坏形式随含水率由单一剪切破坏发展到拉伸破坏,然后剪切拉伸复合型破坏。
[Abstract]:In order to study the influence of water injection on the failure characteristics of coal seam, uniaxial compression tests of coal samples were carried out to observe the energy consumption and failure mode of prefabricated cracked coal samples with different water content. The results show that the uniaxial compressive strength and elastic modulus of coal samples decrease by negative exponential function with the increase of moisture content. The accumulated total energy, the stored elastic energy and the destroyed dissipation energy of the coal sample decrease with the water content in the form of quadratic parabola decreasing function, and the axial stress and the peak stress of the prefabricated crack in the coal sample decrease with the water content. The failure form of the specimen develops from single shear failure to tensile failure with moisture content, and then shear tensile composite failure.
【作者单位】： 贵州大学矿业学院;重庆大学煤矿灾害动力学与控制国家重点实验室;
【基金】：贵州大学引进人才科研项目(贵大人基合字(2015)15)
【分类号】：TD713
本文编号：2424573
[Abstract]:In order to study the influence of water injection on the failure characteristics of coal seam, uniaxial compression tests of coal samples were carried out to observe the energy consumption and failure mode of prefabricated cracked coal samples with different water content. The results show that the uniaxial compressive strength and elastic modulus of coal samples decrease by negative exponential function with the increase of moisture content. The accumulated total energy, the stored elastic energy and the destroyed dissipation energy of the coal sample decrease with the water content in the form of quadratic parabola decreasing function, and the axial stress and the peak stress of the prefabricated crack in the coal sample decrease with the water content. The failure form of the specimen develops from single shear failure to tensile failure with moisture content, and then shear tensile composite failure.
【作者单位】： 贵州大学矿业学院;重庆大学煤矿灾害动力学与控制国家重点实验室;
【基金】：贵州大学引进人才科研项目(贵大人基合字(2015)15)
【分类号】：TD713
【相似文献】
相关期刊论文 前2条
1 方慧;魏文博;李玉堂;;介质含水率与探地雷达信号关系数值模拟[J];物探与化探;2009年05期
2 王俊峰;张力;赵东;;温度及含水率对切削原煤吸附瓦斯特性的影响[J];煤炭学报;2011年12期
相关硕士学位论文 前3条
1 荆俊杰;煤体含水率对CO_2驱替CH_4影响的实验研究[D];太原理工大学;2016年
2 龚选平;泥质粉砂岩含水率对其蠕变特性影响的研究[D];西安科技大学;2006年
3 罗福友;不同含水率砂岩声发射特性研究与应用[D];江西理工大学;2014年
，本文编号：2424573
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2424573.html
