浅埋偏压隧道在变坡面下围岩压力计算分析  

Calculation Analysis of the Surrounding Rock Pressure in Shallow Buried Unsymmetrial Tunnel under Variable Slope

作　　者：白岩 乔婷婷 宁晓骏[1] 刘国坤 BAI Yan;QIAO Tingting;NING Xiaojun;LIU Guokun(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming,Yunnan 650500,China;Changzhi Branch of Shanxi Provincial Highway Bureau,Changzhi,Shanxi 046000,China;School of Architectural Engineering,Hunan Institute of Engineering,Xiangtan,Hunan 411100,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500 [2]山西省公路局长治分局,山西长治046000 [3]湖南工程学院建筑工程学院,湖南湘潭411100

出　　处：《中外公路》2024年第3期211-219,共9页Journal of China & Foreign Highway

基　　金：湖南省教育厅优秀青年项目(编号:22B0737)。

摘　　要：为研究浅埋偏压隧道在变坡面下合理的围岩压力的计算方法,该文建立浅埋偏压隧道在变坡面下围岩压力计算模型,运用极限平衡原理推导围岩压力计算公式。引入中间变量β′,将其作为选取变坡条件下的偏压隧道围岩压力计算方法的依据,并将该文推导公式对比规范公式计算值与隧道围岩压力实测值进行验证。研究结果显示:经对比验证,该文公式具有合理性与实用性。且由计算公式分析可得,当自然坡度角增大,水平侧压力系数λ_(1)随之增大;当黏聚力增大,水平侧压力系数λ_(2)呈先增大后减小趋势;当变坡角度增大,水平侧压力系数λ_(2)将会减小。研究表明:偏压隧道存在变坡会影响隧道变坡段一侧的围岩压力,因此利用该文变坡条件的围岩压力计算公式是必要的。To provide a reasonable method for calculating the surrounding rock pressure in shallow buried unsymmetrial pressure tunnels under variable slope conditions for tunnel design,to establish a model for calculating the surrounding rock pressure in shallow buried unsymmetrial pressure tunnels under variable slope conditions,and to employ the principle of ultimate equilibrium to derived the formula for calculating the surrounding rock pressure.The intermediate variableβ'is introduced as the base for selecting the unsymmetrial pressure tunnels surrounding rock pressure calculation method under variable slope conditions,and the derived formulas in this paper are verified by comparing the calculated values of the normative formulas with the measured values of the tunnel surrounding rock pressure.Results of the study:The equations in this paper are verified to be reasonable and practical by comparison.Analysis of the calculation formula shows that when the natural slope angle increases,the horizontal side pressure coefficientλ_(1) increases;when the cohesive force increases,the horizontal side pressure coefficientλ_(2) tends to increase first and then decrease;when the variable slope angle increases,the horizontal side pressure coefficientλ_(2) will decrease.Studies have shown that the presence of variable slope in a deviated tunnel will affect the surrounding rock pressure on the side of the variable slope section of the tunnel,and it is necessary to use the formula for calculating the surrounding rock pressure for the variable slope conditions in this paper.

关 键 词：隧道工程 偏压隧道 围岩压力 极限平衡原理 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]