考虑渗流剪胀和中间主应力的隧洞围岩稳定性分析

发布时间：2018-06-29 11:25

本文选题：隧洞围岩 + 稳定性　；参考：《中国安全科学学报》2016年02期

【摘要】：为研究隧洞围岩的稳定性,在考虑渗流、剪胀和中间主应力的基础上,依据弹塑性理论和非关联流动法则推导出隧洞围岩应力场和位移场的解析式,分析衬砌反力和洞壁位移的关系,并得到围岩-衬砌特征曲线。结果表明:渗流和中间主应力对隧洞围岩应力场和位移场均有较大的影响,考虑渗流相对于不考虑渗流时,切向应力峰值更大,塑性区半径更小;随着中间主应力的增大,塑性区半径变小,塑性区位移增大;剪胀仅影响围岩位移场,对应力场无影响,剪胀角越大,塑性区位移越大;围岩和衬砌存在相互协调作用的关系,中间主应力越大,最佳衬砌力越小。
[Abstract]:In order to study the stability of surrounding rock of tunnel, on the basis of considering seepage, shear expansion and intermediate principal stress, the analytical expressions of stress field and displacement field of surrounding rock of tunnel are derived according to elastic-plastic theory and non-correlation flow rule. The relationship between lining reaction force and wall displacement is analyzed, and the characteristic curve of surrounding rock lining is obtained. The results show that seepage and intermediate principal stress have great influence on stress field and displacement field of surrounding rock of tunnel. Considering seepage flow, the peak value of tangential stress is larger and the radius of plastic zone is smaller than that without seepage, and with the increase of intermediate principal stress, The radius of the plastic zone becomes smaller, the displacement of the plastic zone increases, the shear expansion only affects the displacement field of surrounding rock, but the force field has no effect, the larger the angle of expansion, the larger the displacement of plastic zone, the more the main stress between the surrounding rock and the lining is, The best lining force is smaller.
【作者单位】：安徽理工大学深部煤矿采动响应与灾害防控安徽省重点实验室;
【基金】：国家自然科学基金资助(51304007)
【分类号】：U451.2

【相似文献】