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中文摘要：
受施工方法与施工手段的限制，常见的地下洞室断面形状都是矩形、直墙半圆拱形等典型的非圆形断面形式。限于目前弹塑性力学和岩石力学的发展水平，除椭圆等极少数非圆形地下洞室周边的应力分布有理论解析解外，其它非圆形地下洞室周围的应力分布都缺乏精确的理论解析解，直接影响了地下洞室的围岩稳定性分析和支护形式与支护参数设计。本文在全面分析影响地下洞室围岩稳定性主要因素的基础上，系统论述了地下洞室深埋的3重含义；分析了采用外接圆半径法进行非圆形地下洞室周围应力分布理论分析时存在的主要问题；提出厂以“当量半径”为特征尺寸的等面积虚拟圆来替代实际非圆形地下洞室的简化方法和“当量半径”的计算公式，为非圆形地下洞室的围岩稳定性分析和支护形式与支护参数设计提供了科学的理论依据。
英文摘要：
Be hedged in with construction methods and means, the most common sectional shapes of underground chambers are all rec- tangle and semicircular which belong to typical non -circular cross section forms. Due to the development of current plasto -elasticity and rock mechanics, stress distribution around non - circular underground chambers has no accurate analytical solution except a few non - circular underground caverns, which directly influenees stability analysis on the surrounding rocks of underground chamber and design of support patrerus and parameters. On the basis of analyzing the main factors which influence stability of surrounding rocks of underground chamber, the paper discusses systematically three definitions of the high -buried underground chamber; analyses the main problems in theoretical analysis about stress distribution in surrounding rock of tbe non - circular underground chamber when the eircumradins method is adopted in ; and puts forth a calculation formula of ＂equivalent radius＂ and a simplified method for equal area virtual circle whose characteristic dimension is ＂equivalent radius＂ takes the place of practical non - circular underground chamber, which provides the scientific theory reference for stability analysis of surrounding rock mass of underground chamber and design of support patterns and parameters.
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