巷道围岩最大主偏应力及塑性区分布形态演化规律研究  

Study on evolution law of maximum principal deviatoric stress and plastic zone distribution in roadway surrounding rock

作　　者：王大顺 WANG Dashun(Zhongyun International Engineering Co.,Ltd.,Zhengzhou 450007,China)

机构地区：[1]中赟国际工程有限公司,河南郑州450007

出　　处：《煤矿安全》2023年第8期118-127,共10页Safety in Coal Mines

摘　　要：巷道围岩应力与塑性区形态分布具有密切联系。以最大主偏应力为指标,通过理论分析对考虑轴向应力的围岩最大主偏应力分布进行深入研究,并通过数值模拟验证了理论分析的正确性。结果表明:不同侧压系数条件下,最大主偏应力会呈现圆形、椭圆形、蝶形3种形态;侧压系数为1时,最大主偏应力为标准的圆形形态,随着侧压系数的增加,最大主偏应力逐渐由圆形向类椭圆再向蝶形、蝶形恶性扩展过渡;在相同应力环境下,巷道围岩塑性区形态与最大主偏应力形态具有一一对应关系,最大主偏应力的分布在一定程度上可以反映塑性区的形态。基于偏应力与塑性区的对应关系,对口孜东矿深埋巷道的稳定性进行分析,并提出巷道支护控制建议。The stress of surrounding rock is closely related to the distribution of plastic zone.In this paper,the maximum principal deviatoric stress is taken as the index,and the maximum principal deviatoric stress distribution of surrounding rock considering axial stress is deeply studied through theoretical analysis,and the correctness of theoretical analysis is verified by numerical simulation.The results show that:under different lateral pressure coefficients,the maximum principal deviatoric stress will show three forms:circular,elliptical and butterfly.When the lateral pressure coefficient is 1,the maximum principal deviatoric stress is a standard circular shape;with the increase of the lateral pressure coefficient,the maximum principal deviatoric stress gradually changes from circular to elliptical and then to butterfly and butterfly;under the same stress environment,there is a one-to-one correspondence between the plastic zone shape of roadway surrounding rock and the maximum principal deviatoric stress shape.The distribution of the maximum principal deviatoric stress can reflect the shape of the plastic zone to a certain extent;based on the correspondence between deviatoric stress and plastic zone,the stability of deep roadway in Kouzidong mine is analyzed,and the suggestions of roadway support control are proposed.

关 键 词：最大主偏应力 塑性区 围岩控制 屈服准则 蝶形破坏 

分 类 号：TD322[矿业工程—矿井建设]