中文摘要：

为研究深部矩形巷道围岩塑性区形成与发展过程，采用理论分析和数值模拟等手段，分析了不同埋藏深度、巷道高宽比、侧压系数对巷道围岩塑性区的形成、发展以及形态范围的影响规律．分析表明：（1）矩形巷道围岩失稳破坏是围岩塑性区畸变向巷道围岩深部非均匀恶性扩展的结果，对于深部矩形巷道而言，其经历了完整的塑性区恶性扩展过程，对于浅部巷道而言，巷道塑性区扩展过程并不完整；（2）在矩形巷道高宽比较小时，塑性区向巷道围岩深部非均匀扩展、恶性扩展的范围及巷道顶板变形量与高宽比呈正相关；（3）垂直载荷一定情况下，水平载荷过小或者过大，围岩塑性区越容易形成不规则的塑性区，侧压系数的改变直接改变了塑性区的几何形态．

英文摘要：

In order to study the formation and the development of the plastic zone of surrounding rock in deep rectangular tunnel, this paper, by using the theoretical analysis and the numerical simulation, the different burial depth, roadway length-width ratio, coefficient of lateral pressure on roadway surrounding rock plastic zone formation to development and form and range are analyzed and studied. Results show that （ 1 ） Rectangular roadway surrounding rock instability and failure of surrounding rock plastic distortion to roadway in deep non-uniform results in the malignant expansion. For deep roadway, plastic zone malignant expansion process, while for shallow tunnel, surrounding rock rectangular underwent completes the rectangular tunnel plastic zone expansion process are not complete; （2） In the high aspect ratio of rectangular roadway, the plastic zone extends to the surrounding rock of roadway, the range of the malignant expansion and the deformation of roadway roof are positively correlated with the length-width ratio; and （3） Under certain circumstances, the vertical load, horizontal load is too small or too large, plastic zones form the irregular plastic zone more easily, the alteration of the lateral pressure coefficient directly changes the geometry of the plastic zone.