非均匀应力场圆形巷道塑性区研究
Study on Plastic Zone of Circular Roadway Under Non-uniform Stress Field
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摘要: 为了研究巷道开挖后巷道围岩的塑性区分布规律，首先分析巷道围岩的应力分布特征，在计算出围岩应力分布规律基础上，依据摩尔库伦强度准则推导出圆形巷道围岩的弹塑性区。通过理论计算得出侧向应力、地应力、黏聚力、内摩擦角参数变化时巷道围岩的塑性区范围，从而总结出巷道围岩塑性区的演化规律，结果表明，侧压力系数λ对圆形巷道围岩的塑性区有很大影响，当λ=1时，巷道围岩塑性区为圆形；当λ<1时，塑性区在两帮较大，顶部小；当λ>1时，塑性区在两帮较小，顶部大，且角部塑性区发展迅速；随着地应力的增加，塑性区的范围也随之增大；随黏聚力增大塑性区范围减小；随着内摩擦角φ的增大塑性区范围随之减小，但影响较小。
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关键词:
- 圆形巷道 /
- 塑性区 /
- 侧压力系数 /
- Mohr Coulomb准则 /
- 松动圈
Abstract: In order to study the plastic zone distribution features of the surrounding rocks after excavated, the article firstly analyzes stress distribution characteristics of the surrounding rock; on this basis, circular roadway for the elastic and plastic zone is derived based on the Mohr Coulomb strength criterion. The plastic zone in the surrounding rock of the mine roadway under the conditions of different side pressure，different stress，different cohesion and different friction angle was obtained with the theoretical calculation．The evolution of the plastic zone is summed up from plastic zone equation. The results show that when λ is 1, the plastic zone is circular; when λ is less than 1, the plastic zone range is large at roadway side, the plastic zone range is small at roadway top; when λ is more than 1, it is clean contrary; the rapid development of the plastic zone in the corner; with the increase of stress, the plastic zone increases; with the cohesion increases the plastic zone reduces; with the cohesion increases the plastic zone reduces. -
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