梯形断面竖向预应力锚索抗滑桩是一种水毁滑坡治理的新方法,针对以往计算模型仅将梯形抗滑桩的土拱效应视为两个独立土拱作用的缺陷,考虑土拱之间存在的衔接问题,提出了梯形抗滑桩存在双土拱整体共同作用形式的新方法。通过建立整体土...梯形断面竖向预应力锚索抗滑桩是一种水毁滑坡治理的新方法,针对以往计算模型仅将梯形抗滑桩的土拱效应视为两个独立土拱作用的缺陷,考虑土拱之间存在的衔接问题,提出了梯形抗滑桩存在双土拱整体共同作用形式的新方法。通过建立整体土拱形式的计算模型,推导了整体土拱桩间距计算公式,弥补梯形抗滑桩桩间土拱整体共同作用时的桩间距计算,并依托工程应用对计算值进行了分析比对。在其他因数恒定时,定量分析了荷载对桩间距的影响。结果表明:桩间距计算值较为合理,即桩间距离相对较大,说明了梯形抗滑桩增加的桩侧角度,使土拱效应得到增强,对滑坡治理起到了更好效果;得到滑坡产生的均布荷载在40 k N/m<q<120 k N/m时对桩间距影响幅度为47%,在120 k N/m<q<200 k N/m时对桩间距影响幅度为18%。研究成果为梯形抗滑桩设计提供理论参考。展开更多
Shapai Roller Compacted Concrete(RCC) Arch Dam is the highest RCC arch dam of the 20th century in the world with a maximum height of 132m,and it is the only concrete arch dam near the epicentre of Wenchuan earthquake ...Shapai Roller Compacted Concrete(RCC) Arch Dam is the highest RCC arch dam of the 20th century in the world with a maximum height of 132m,and it is the only concrete arch dam near the epicentre of Wenchuan earthquake on May 12th,2008.The seismic damage to the dam and the resistance of the dam has drawn great attention.This paper analyzed the response and resistance of the dam to the seismic wave using numerical simulations with comparison to the monitored data.The field investigation after the earthquake and analysis of insitu data record showed that there was only little variation in the opening size at the dam and foundation interface,transverse joints and inducing joints before and after the earthquake.The overall stability of the dam abutment resistance body was quite good except a little relaxation was observed.The results of the dynamic finite element method(FEM) showed that the sizes of the openings obtained from the numerical modeling are comparable with the monitored values,and the change of the opening size is in millimeter range.This study revealed that Shapai arch dam exhibited high seismic resistance and overload capacity in the Wenchuan earthquake event.The comparison of the monitored and simulated results showed that the numerical method applied in this paper well simulated the seismic response of the dam.The method could be useful in the future application on the safety evaluation of RCC dams.展开更多
文摘梯形断面竖向预应力锚索抗滑桩是一种水毁滑坡治理的新方法,针对以往计算模型仅将梯形抗滑桩的土拱效应视为两个独立土拱作用的缺陷,考虑土拱之间存在的衔接问题,提出了梯形抗滑桩存在双土拱整体共同作用形式的新方法。通过建立整体土拱形式的计算模型,推导了整体土拱桩间距计算公式,弥补梯形抗滑桩桩间土拱整体共同作用时的桩间距计算,并依托工程应用对计算值进行了分析比对。在其他因数恒定时,定量分析了荷载对桩间距的影响。结果表明:桩间距计算值较为合理,即桩间距离相对较大,说明了梯形抗滑桩增加的桩侧角度,使土拱效应得到增强,对滑坡治理起到了更好效果;得到滑坡产生的均布荷载在40 k N/m<q<120 k N/m时对桩间距影响幅度为47%,在120 k N/m<q<200 k N/m时对桩间距影响幅度为18%。研究成果为梯形抗滑桩设计提供理论参考。
基金supported by The National Natural Science Foundation of China(Grant No. 51079092)Specialized Research Fund for the Doctoral Program of Higher Education(Grant no.20090181120088)Science and Technology Support Plan Project of Sichuan Province (Grant No. 2008SZ0163)
文摘Shapai Roller Compacted Concrete(RCC) Arch Dam is the highest RCC arch dam of the 20th century in the world with a maximum height of 132m,and it is the only concrete arch dam near the epicentre of Wenchuan earthquake on May 12th,2008.The seismic damage to the dam and the resistance of the dam has drawn great attention.This paper analyzed the response and resistance of the dam to the seismic wave using numerical simulations with comparison to the monitored data.The field investigation after the earthquake and analysis of insitu data record showed that there was only little variation in the opening size at the dam and foundation interface,transverse joints and inducing joints before and after the earthquake.The overall stability of the dam abutment resistance body was quite good except a little relaxation was observed.The results of the dynamic finite element method(FEM) showed that the sizes of the openings obtained from the numerical modeling are comparable with the monitored values,and the change of the opening size is in millimeter range.This study revealed that Shapai arch dam exhibited high seismic resistance and overload capacity in the Wenchuan earthquake event.The comparison of the monitored and simulated results showed that the numerical method applied in this paper well simulated the seismic response of the dam.The method could be useful in the future application on the safety evaluation of RCC dams.
