Analysis on mining-induced stress evolution and surrounding rock failure mode of roadway during heading-mining period based on continuous measurement
Mining-induced stress is one of the fundamental driving force of geological disasters in coal mining.In order to master the evolution law of mining-induced stress of surrounding rock during heading and mining period,hollow inclusion stress measurement technology was employed to obtain the full-cycle stress evolution data of the 122110 working face auxiliary roadway from the heading to the end of mining for the first time,in the Shaanxi Coal Caojiatan Mining Co.,Ltd.A method for calculating the full amount of stress based on continuous monitoring of hollow inclusion strain gauges was proposed,and the validity of the measured data was determined based on the M-C criterion.The dynamic change law of the mining-induced stress in the surrounding rock under the influence of heading and mining was revealed,and the failure mode of the roadway surrounding rock was discussed using the stress ratio K.The research results show that the influence range of advance mining-induced stress during heading period and mining period was 8 m and 110 m,respectively,and the difference between maximum and minimum principal stress increases 0.17 and 1.58 times,respectively.The increase value during mining period was 9.3 times of that during heading period.The failure mode of surrounding rock was mainly tensile failure of surface surrounding rock during heading period,and plastic failure occurred in a large range during mining period,in which the shallow surrounding rock is mainly tensile failure,the middle surrounding rock is tension-shear composite failure,and the deep area is generally less failure.The comprehensive field-measured data,drilling results,and in-situ failure characteristics indicate that the stress ratio K can better reflect the relationship between the stress state and the surrounding rock failure mode of the mining roadway.
万方数据
维普
