浅埋隧道围岩压力的简化解析解分析  

Simple Theoretical Analysis of Rock Pressure for Shallow-buried Tunnels

作　　者：李志鹏 LI Zhipeng(The 3rd Engineering Co.,Ltd.,China Railway Construction Bridge Engineering Bureau Group,Shenyang 110043,China)

机构地区：[1]中铁建大桥工程局集团第三工程有限公司,辽宁沈阳110043

出　　处：《佳木斯大学学报（自然科学版）》2024年第6期117-120,共4页Journal of Jiamusi University：Natural Science Edition

摘　　要：为了解决经典围岩压力理论不适用于浅埋隧道围岩压力计算的问题,选取更接近实际的双折线破裂面形式,利用极限平衡法建立浅埋隧道的围岩压力解析解公式,与实测围岩压力对比误差均在20%以下,验证了方法的合理性。通过控制变量法研究了覆土厚度、土体重度和内摩擦角等因素对围岩压力的影响规律,上、下临界破裂角不是固定值,随着计算参数的变化而变化;围岩压力与上覆土体厚度和土体重度呈正相关,与内摩擦角呈负相关。To solve the problem that the classical surrounding rock pressure theory is not suitable for calculating the surrounding rock pressure of the shallow buried tunnels.Selecting the double-broken line rupture surface form closer to the actual situation,an analytical solution of surrounding rock pressure in shallow buried tunnels was established with the limit equilibrium method.The calculated results were compared with the measured surrounding rock pressure through examples.The calculation errors of different examples all are less than 20%,which verifies the rationality of the proposed method.Then the influence of the thickness of overlying soil,the outside diameter of tunnel,the unit weight and the internal friction angle of soil on surrounding rock pressure were studied by the variable-controlling approach.The calculation results show that the upper and lower critical rupture angles were not fixed,but a variable changing with calculation parameters.The surrounding rock pressure of the tunnel is correlated positively with the thickness of overlying soil,the outer diameter of tunnel and the unit weight of soil,while negatively with the internal friction angle.

关 键 词：隧道工程 浅埋 围岩压力 破坏模式 破裂面 

分 类 号：TU452[建筑科学—岩土工程]