研究目的:本文以某山地米轨铁路为例,研究坡度250‰以上有砟轨道结构的稳定性和极限坡度。首先进行米轨混凝土枕的道床阻力测试试验,并建立轨排结构有限元模型,分析坡度和扣件阻力对轨排结构稳定性的影响;接着建立米轨有砟轨道三维有限...研究目的:本文以某山地米轨铁路为例,研究坡度250‰以上有砟轨道结构的稳定性和极限坡度。首先进行米轨混凝土枕的道床阻力测试试验,并建立轨排结构有限元模型,分析坡度和扣件阻力对轨排结构稳定性的影响;接着建立米轨有砟轨道三维有限元模型,研究坡度与竖曲线半径对有砟道床稳定性的影响;最后,根据扣件阻力、道床阻力与大坡道有砟轨道稳定性的关系提出米轨有砟轨道极限坡度和竖曲线半径的建议值。研究结论:(1)通过试验测试,得到了道床阻力-位移关系,结果表明轨排结构的稳定性随坡度增大而减弱,在扣件阻力不大于10 k N/组时其极限坡度为500‰;(2)有砟道床的稳定性随着坡度的增大而逐渐减弱,在列车荷载作用下,有砟道床保持稳定的最大坡度为500‰;(3)变坡点凸形竖曲线附近道床稳定性弱于直坡道地段,且其稳定性随着竖曲线半径的增大而逐渐增强,在坡度为250‰的情况下,为了保持有砟道床稳定竖曲线半径不能小于400 m;(4)本文研究成果可为米轨铁路大坡道有砟轨道结构稳定性分析提供理论与试验依据。展开更多
Given the challenges in managing large deformation disasters in energy engineering,traffic tunnel engineering,and slope engineering,the excavation compensation theory has been proposed for large deformation disasters ...Given the challenges in managing large deformation disasters in energy engineering,traffic tunnel engineering,and slope engineering,the excavation compensation theory has been proposed for large deformation disasters and the supplementary technology system is developed accordingly.This theory is based on the concept that“all destructive behaviors in tunnel engineering originate from excavation.”This paper summarizes the development of the excavation compensation theory in five aspects:the“theory,”“equipment,”“technology,”the design method with large deformation mechanics,and engineering applications.First,the calculation method for compensation force has been developed based on this theory,and a comprehensive large deformation disaster control theory system is formed.Second,a negative Poisson's ratio anchor cable with high preload,large deformation,and super energy absorption characteristics has been independently developed and applied to large deformation disaster control.An intelligent tunnel monitoring and early warning cloud platform system are established for remote monitoring and early warning system of Newton force in landslide geological hazards.Third,the double gradient advance grouting technology,the two-dimensional blasting technology,and the integrated Newton force monitoring--early warning--control technology are developed for different engineering environments.Finally,some applications of this theory in China's energy,traffic tunnels,landslide,and other field projects have been analyzed,which successfully demonstrates the capability of this theory in large deformation disaster control.展开更多
文摘研究目的:本文以某山地米轨铁路为例,研究坡度250‰以上有砟轨道结构的稳定性和极限坡度。首先进行米轨混凝土枕的道床阻力测试试验,并建立轨排结构有限元模型,分析坡度和扣件阻力对轨排结构稳定性的影响;接着建立米轨有砟轨道三维有限元模型,研究坡度与竖曲线半径对有砟道床稳定性的影响;最后,根据扣件阻力、道床阻力与大坡道有砟轨道稳定性的关系提出米轨有砟轨道极限坡度和竖曲线半径的建议值。研究结论:(1)通过试验测试,得到了道床阻力-位移关系,结果表明轨排结构的稳定性随坡度增大而减弱,在扣件阻力不大于10 k N/组时其极限坡度为500‰;(2)有砟道床的稳定性随着坡度的增大而逐渐减弱,在列车荷载作用下,有砟道床保持稳定的最大坡度为500‰;(3)变坡点凸形竖曲线附近道床稳定性弱于直坡道地段,且其稳定性随着竖曲线半径的增大而逐渐增强,在坡度为250‰的情况下,为了保持有砟道床稳定竖曲线半径不能小于400 m;(4)本文研究成果可为米轨铁路大坡道有砟轨道结构稳定性分析提供理论与试验依据。
基金National Natural Science Foundation of China,Grant/Award Number:41941018State Key Laboratory for GeoMechanics and Deep Underground Engineering,Grant/Award Number:SKLGDUEK202201。
文摘Given the challenges in managing large deformation disasters in energy engineering,traffic tunnel engineering,and slope engineering,the excavation compensation theory has been proposed for large deformation disasters and the supplementary technology system is developed accordingly.This theory is based on the concept that“all destructive behaviors in tunnel engineering originate from excavation.”This paper summarizes the development of the excavation compensation theory in five aspects:the“theory,”“equipment,”“technology,”the design method with large deformation mechanics,and engineering applications.First,the calculation method for compensation force has been developed based on this theory,and a comprehensive large deformation disaster control theory system is formed.Second,a negative Poisson's ratio anchor cable with high preload,large deformation,and super energy absorption characteristics has been independently developed and applied to large deformation disaster control.An intelligent tunnel monitoring and early warning cloud platform system are established for remote monitoring and early warning system of Newton force in landslide geological hazards.Third,the double gradient advance grouting technology,the two-dimensional blasting technology,and the integrated Newton force monitoring--early warning--control technology are developed for different engineering environments.Finally,some applications of this theory in China's energy,traffic tunnels,landslide,and other field projects have been analyzed,which successfully demonstrates the capability of this theory in large deformation disaster control.
