摘要
为了更好地分析隧洞开挖过程中侧壁应力、变形等参数的变化情况,对岩体采用D-P准则模型设置材料性能,并且通过生死单元法的开挖方式来了解整个过程中隧洞侧壁应力的变化规律;同时建立了一种基于响应面的侧壁应力应变多目标优化方法,基于敏感度选取对侧壁应力应变有影响的关键参数,应用响应面方法建立变量与多目标函数的响应面多元回归模型,分析影响侧壁应力应变的参数交互作用,最终在满足隧洞设计要求的条件下,确定以降低侧壁应力与应变为目标的最优组合。结果表明:在开挖的过程中,主要应力变化集中在第2步开挖中,该过程中应力、应变的峰值和方向发生了极大的改变,应力峰值从9.7×10~5Pa变为1.47×10~6Pa,方向从沿侧壁向外转变为沿侧壁向内,这易导致隧洞侧壁的坍塌;在响应面分析优化下将截面长、截面宽组合设计为1.35、2 m后,其应力峰值下降了10.01%,采用生死单元开挖方式结合响应面优化的方法能够为隧洞设计优化和开挖过程参数提供有效的分析。
In order to better analyze the changes of parameters such as sidewall stress and deformation during tunnel excavation,the D-P criterion model was used to set the material properties of the rockmass,and the life and death unit excavation method was used to understand the tunnel sidewall stress during the whole process.In addition,a multi-objective optimization method for sidewall stress and strain based on response surface was established.The key parameters affecting the stress and strain of the sidewall are selected based on the sensitivity.The RSM was used to establish the response surface of the variable and multi-objective function.Multivariate regression model was used to analyze the interaction of parameters affecting sidewall stress and strain.Finally,the optimal combination of reducing sidewall stress and strain that meeting the tunnel design requirements was determined.The results showed that the main stress changes were concentrated in the second step of excavation.During the excavation,the peak and direction of stress and strain changed greatly.The stress peak changed from 9.7×10~5 Pa to 1.47×10~6 Pa,and the direction changes from sidewall to outward.The sidewall is inward,which easily leads to the collapse of the sidewall of the tunnel.The combination of the length and width of the section 1.35 m and2 m with the optimization of response surface analysis leads to the stress peaks fell 10.01%.The life and death excavation method combining with the response surface provides an effective way for the well design optimization analysis and tunnel excavation process parameters analysis.
作者
南轩
刘艳慧
孙语晨
张玉波
张明飞
NAN Xuan;LIU Yanhui;SUN Yuchen;ZHANG Yubo;ZHANG Mingfei(School of Architectural Engineering,Yunnan Agricultural University y Kunming 650000,China;Key Uiboratory of Urban and Rural Water Safety and Water Saving and Emission Reduction,Kunming 650000,China)
出处
《水资源与水工程学报》
CSCD
2019年第5期176-183,共8页
Journal of Water Resources and Water Engineering
基金
中国水利水电十四工程局有限公司科技项目(201707)
云南省教育厅重点实验室专项基金
关键词
输水隧洞
生死单元开挖
侧壁应力
响应面法
优化设计
water tunnel
life and death unit excavation
sidewall stress
response surface method
optimal design
