摘要
为了研究浅埋掌子面被动模式下的稳定性,构建浅埋隧道的二维被动破坏模式,被动破坏模式由有限个刚性平动多块体组成。将孔隙水压力视为外力进行做功,基于极限分析理论利用Hoek-Brown强度准则研究浅埋隧道掌子面被动破坏模式下的稳定性。通过虚功率原理推导得到浅埋隧道被动破坏模式下的极限支护力的目标函数,采用非线性规划求解函数得到其上限解。将本文方法和既有文献中的方法得到的结果进行比较,极限支护力的上限解随参数的变化趋势一致,误差范围最大仅为4.03%。研究分析了不同参数条件下浅埋隧道掌子面极限支护力的变化规律,结果表明:随着孔隙水压力系数ru和扰动因子D的增大,浅埋隧道掌子面的被动破坏机制下的极限支护力和被动破坏范围呈现逐渐增大的趋势,而随着GSI和参数mi的增大而减小;孔隙水压力对隧道的稳定性有着显著的不利影响。该方法可为浅埋隧道掌子面的被动破坏机制下支护力的设计优化提供参考。
In order to study the stability of shallow tunnel face under passive mode,a two-dimensional passive failure mode of shallow tunnel is constructed.The passive failure mode is composed of a finite number of rigid translational blocks.Taking pore water pressure as external force,the stability of shallow tunnel face under passive failure mode is studied based on limit analysis theory and Hoek Brown strength criterion.The objective function of the limit support force in the passive failure mode of shallow tunnel is derived by the principle of virtual power,and its upper limit solution is obtained by using nonlinear programming function.Comparing the results obtained by the method in this paper with those in the existing literature,the upper bound solution of the ultimate support force has the same trend with the variation of parameters,and the maximum error range is only 4.03%.The results show that the limit support force and passive failure range of shallow tunnel face increase with the increase of pore water pressure coefficient ruand disturbance factor D,and decrease with the increase of geological strength index GSI and parameter mi;the stability of pore water pressure on the tunnel is also discussed which has a significant adverse effect.The method in this paper can provide a reference for the design and optimization of support force under the passive failure mechanism of shallow tunnel face.
作者
张世民
付开
黄睿
杨桦
郭帅
ZHANG Shimin;FU Kai;HUANG Rui;YANG Hua;GUO Shuai(College of Civil Engineering,Shaoxing University,Shaoxing 312000,China;Department of Civil Engineering,Zhejiang University City College,Hangzhou 310015,China;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing 312000,China;Zhejiang Construction Engineering Quality Inspection Co.,LTD.,Hangzhou 310012,China;Zhejiang Huayun Foundation Engineering Co.,LTD.,Huzhou 313200,China)
出处
《结构工程师》
2022年第1期156-163,共8页
Structural Engineers
基金
国家自然科学基金青年基金项目(51708354)
浙江省基础公益研究计划项目(LGF18E080012)
浙江省住建厅项目(2020k074)。
关键词
浅埋隧道
掌子面
被动破坏
稳定性
极限支护力
shallow tunnel
face
passive failure
stability
ultimate support force
