摘要
针对王家塔煤矿3s101工作面采空区侧保留巷道受采动影响导致围岩破坏变形的问题,采用现场监测、理论分析、数值模拟等研究方法,对采动影响下保留巷道的围岩变形破坏特征、采动应力分布规律、以及围岩塑性破坏特征进行了研究。结果表明:受工作面采动影响,保留巷道位移变化主要在工作面后方顶底板,最大顶底板移近量达310 mm;巷道围岩主应力、主应力比值、最大主应力与z轴夹角的变化值在工作面后方175 m左右达到最大,最大主应力达到16 MPa,主应力比值达到2.32,最大主应力与z轴的夹角偏转至20°左右;受采动应力的影响,巷道围岩塑性破坏区也主要发生在工作面后方,塑性破坏范围在工作面后方175 m左右达到最大,顶板最大破坏深度达7.5 m。针对性地提出了“锚索+钢带”加强支护顶板的补强治理方案,保证了巷道围岩稳定,回采期间安全生产。
Aiming at the problem of surrounding rock failure and deformation caused by the influence of mining in the gob side reserved roadway of 3 s101 mining face in Wangjiata coal mine. Comprehensive research methods including theoretical analysis field monitoring and numerical simulation were adopted.The deformation and failure characteristics of surrounding rock, the distribution of mining stress and the plastic failure characteristics of surrounding rock of reserved roadway under the influence of mining are studied. Researches show that: under the influence of mining, the displacement is mainly in the roof and floor of roadway behind the mining face,and the maximum displacement of the roof and floor of roadway was 310 mm;the variation of the principal stress,the ratio of principal stress and the angle between the maximum principal stress and z-axis reached the maximum at about 175 m behind the mining face, the maximum principal stress reached 16 MPa, the principal stress ratio reached 2.32, and the angle between the maximum principal stress and the z-axis was deflected to about 20°. Affected by the mining stress, the plastic failure zone of the surrounding rock of the roadway also mainly occurs behind the mining face. The failure range of plastic zone of surrounding rock of roadway reaches the maximum at 175 m behind the mining face, and the maximum failure depth of roof reaches 7.5 m. The reinforcement measures of "anchor cable +steel belt" is proposed,and which ensures the stability of surrounding rock and safe production during mining.
作者
刘凯文
高运增
代双成
邢旭东
LIU Kai-wen;GAO Yun-zeng;DAI Shuang-cheng;XING Xu-dong(Beijing Tiandi Huatai Mining Management Co.,Ltd.,Beijing 100013,China)
出处
《煤炭技术》
CAS
北大核心
2021年第8期27-31,共5页
Coal Technology
基金
天地华泰自主科技创新项目(TDHTKY2020004,TDHTKY2021001)。
关键词
采动影响
保留巷道
应力分布
塑性区
补强支护
mining influence
reserved roadway
stress distribution
plastic zone
reinforcement support
