摘要
为了揭示动力扰动下煤体的冲击失稳机理,对动静组合加载下煤体损伤机制及力学响应特征进行定性研究。首先进行冲击矿井煤体力学性质测定试验,继而运用RFPA2D-DynamicStatic软件模拟分析了静力水平和动力扰动波形对煤体裂隙发育、损伤单元分布及声发射特征的影响,研究了动力扰动对煤体力学性能和能量演化特征的影响。研究结果表明:(1)动静组合加载下,煤体抗压强度与损伤度呈线性负相关性,弹性能储能极限与损伤度呈负指数关系。(2)在动力扰动作用下,煤体内部损伤不断加剧,煤体弹性能储能极限以[]13.71ln 36.33eU (28)-D (10)的趋势不断降低,冲击破坏损耗能不断减少,原本积聚在煤体内的弹性能会瞬间释放,导致煤体冲击破坏。(3)提出了增加煤柱的抗扰动能力和减少煤体中积聚的弹性能2种防治震动型冲击地压措施。
To figure out the mechanism of coal bumps for highly-stressed coal under dynamic disturbance, the damage and mechanical properties of coal under coupled static-dynamic loading were qualitatively investigated. Firstly the mechanical properties of coal were experimentally measured. Based on the experimental data, numerical simulation model was established using RFPA2 D-Dynamic Static software. The effects of static stress levels and dynamic disturbance waveform on fracture development, damage unit distribution and acoustic emission of coal were analyzed. The mechanical properties and energy evolution of coal under dynamic disturbance were also studied. Results are as follows:(1) There is a linear negative correlation between compressive strength and damage degree of coal under static and dynamic loading. Elastic energy storage limit and damage degree have negative exponential relationship.(2) Under the dynamic disturbance, the damage inside coal body increases, and the trend of energy storage limit of coal body decreases. The original accumulation in the coal body of elastic performance will be instantly released, leading to coal damage.(3) From the point of decrease in elastic energy release, two measures for coal bumps prevention are put forward. On the one hand, disturbance rejection ability of coal should be strengthened. Elastic energy storage limits can be strengthened by roadway support. On the other hand, elasticity in coal should be released through relief boreholes.
作者
杨英明
陶春梅
郭奕宏
张科学
YANG Yingming;TAO Chunmei;GUO Yihong;ZHANG Kexue(China Energy Investment Corporation,Beijing 100011,China;Department of Thermal Engineering, Tsinghua University,Beijing 100084,China;Lianyungang Water Authority,Lianyungang,Jiangsu 222006,China;Yanching Institute of Technology,Langfang,Hebei 065201,China;China Coal Technology and Engineering Group,Beijing 100013,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第1期198-206,共9页
Journal of Mining & Safety Engineering
基金
煤炭资源与安全开采国家重点实验室开放基金项目(SKLCRSM16KFB08)
中国工程院咨询研究项目(2017-ZD-03-03-03)
中国博士后科学基金面上项目(2017M620955)
关键词
动静组合加载
煤体
损伤
力学特性
冲击地压
coupled static-dynamicloading
coal
damage
mechanical properties
coal bumps
