Based on unified strength theory , the boundary line equation of surrounding rock mass plastic zone under non - uniform stress field was deduced , and it can be used to pre - estimate the dimensions and shapes of underground tunnel ' s plastic zone with different coefficients of horizontal pressure 摘要基于統(tǒng)一強(qiáng)度理論,推導(dǎo)出非均勻應(yīng)力場的巷道圍巖塑性區(qū)邊界線方程式,可用于預(yù)測不同側(cè)壓系數(shù)時地下深埋隧洞的塑性區(qū)大小及形狀。