水浸煤岩体强度变化研究

以李家壕煤矿地下水库为背景,从3^-1号煤层取煤岩样进行加工,对煤岩样浸水处理,采用CMT5305微机控制电子万能试验机对煤岩样进行抗压强度和抗拉强度实验,得出平均值。根据煤岩样自然状态和浸水一周平均抗压和抗拉强度实验数据分析水对煤岩的软化作用,得出煤岩的颗粒构成、矿物成分、坚硬程度等因素决定了水对煤岩强度的损伤及其软化程度,煤样和岩样浸水弱化表现不同,岩样较煤样强度弱化程度更大。煤岩遇水后强度降低的现象为水对岩石的软化作用,软化作用形成的原因有化学作用、物理作用或力学作用。分析水浸煤岩体的强度,对水库坝体的稳定性和水库建成后安全运行具有重要的意义。

Study on strength change of water-immersed coal and rock mass

Taking the underground reservoir of Lijiahao coal mine as the engineering background,after taking coal and rock samples from 3^(-1 )coal seam and soaking treatment,the compressive strength and tensile strength of coal and rock samples are tested by using CMT5305 microcomputer controlled electronic universal testing machine.According to the experimental data of average compressive strength and tensile strength of coal and rock samples in natural state and immersion for a week,the softening effect of water on coal and rock mass is analyzed.The results show that the particle composition,mineral composition and hardness of coal and rock mass determine the damage and softening degree of water to coal and rock mass.The weakening performance of coal sample and rock sample is different,and the weakening degree of rock sample is greater than that of coal sample.The phenomenon that the strength of coal and rock decreases when it meets with water is the softening action of water on rock,which is caused by chemical action,physical action or mechanical action.It is very important to analyze the strength of the water soaked coal rock mass for the stability of the dam and the safe operation of the reservoir.It is of great significance to analyze the strength of the water-soaked coal and rock mass for the stability of the dam body and the safe operation after the reservoir is built.