框架预应力锚杆支护结构中锚杆间距的设计参数
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摘要
基于某公路边坡加固工程实例,研究框架预应力锚杆柔性支护结构中锚杆间距设计参数对框架内力和锚杆轴力的影响,讨论锚杆间距的相对最优组合问题.结果表明锚杆水平间距的小范围变化主要影响框架横梁的内力,锚杆竖向间距和第一排锚杆离坡顶的距离的小范围变化主要影响框架立柱的内力,且前两者增大时锚杆轴力从上至下都呈现先增大后减小的现象,总体上呈"弓形"分布.另外,考虑到支护结构的立面美观效果、经济性和锚杆承载力的合理性要求,在土质较为均匀的条件下,锚杆的水平间距、竖向间距和第一排锚杆离坡顶的距离分别取2.5、2.5、1.5 m时是相对最优的.
Based on an engineering practice of highway slope reinforcement,the influences of design parameters of anchor spacing in flexible supporting structure with framed and prestressed anchors on the internal forces of the supporting structure and axial forces of anchors were studied.In addition,the relatively optimum combination of the spacing design parameters of anchors was discussed,also.The analysis result showed that a small change in horizontal spacing would have an influence mainly on the internal forces of horizontal framed beams,and a small change in vertical spacing and distance of the first row of anchor from slope top would have effect mainly on the internal forces of vertical framed columns.When the spacing increased,the axial forces of anchors in the both cases increased first and then decreased downward along the anchor,the distribution shape being of "arch form".Moreover,based on the requirements of aesthetic effect of elevation of the supporting structure,its economy and baring capacity of the anchor,the relatively optimal horizontal spacing,vertical spacing,and distance of the first row of anchor from the slope top would be 2.5 m,2.5 m and 1.5 m,respectively,in the condition of homogeneous soil.
Based on an engineering practice of highway slope reinforcement,the influences of design parameters of anchor spacing in flexible supporting structure with framed and prestressed anchors on the internal forces of the supporting structure and axial forces of anchors were studied.In addition,the relatively optimum combination of the spacing design parameters of anchors was discussed,also.The analysis result showed that a small change in horizontal spacing would have an influence mainly on the internal forces of horizontal framed beams,and a small change in vertical spacing and distance of the first row of anchor from slope top would have effect mainly on the internal forces of vertical framed columns.When the spacing increased,the axial forces of anchors in the both cases increased first and then decreased downward along the anchor,the distribution shape being of "arch form".Moreover,based on the requirements of aesthetic effect of elevation of the supporting structure,its economy and baring capacity of the anchor,the relatively optimal horizontal spacing,vertical spacing,and distance of the first row of anchor from the slope top would be 2.5 m,2.5 m and 1.5 m,respectively,in the condition of homogeneous soil.
引文
[1]董建华,朱彦鹏.地震作用下土钉支护高速公路边坡动力参数分析[J].西安建筑科技大学学报:自然科学版,2007,39(5):661-666.
[2]周勇,朱彦鹏,王卫华.黄土边坡框架预应力锚杆支挡结构的优化设计[J].四川建筑科学研究,2006,32(6):121-124,127.
[3]周勇,朱彦鹏.兰州地区深基坑支护技术探讨[J].兰州理工大学学报,2007,33(5):109-113.
[4]李忠,朱彦鹏.框架预应力锚杆边坡支护结构稳定性计算方法及其应用[J].岩石力学与工程学报,2005,24(21):3922-3926.
[5]朱彦鹏,郑恒,李忠.框架预应力锚杆边坡支护结构稳定性分析[J].岩土力学,2006,27(增1):746-750.
[6]周勇,朱彦鹏.框架预应力锚杆边坡支护结构的稳定性分析方法及其应用[J].工程地质学报,2008,16(3):376-382.
[7]周勇,朱彦鹏.黄土地区框架预应力锚杆支护结构设计参数的灵敏度分析[J].岩石力学与工程学报,2006,25(增1):3115-3122.
[8]朱亚林,孔宪京,邹德高,等.预应力锚杆柔性支护的结构参数变化研究[J].安徽建筑工业学院学报:自然科学版,2003,11(4):30-36.
[9]周勇,朱彦鹏.基于梁柱扭转效应的框架预应力锚杆柔性支护结构内力计算[J].兰州理工大学学报,2009,35(2):116-121.
[2]周勇,朱彦鹏,王卫华.黄土边坡框架预应力锚杆支挡结构的优化设计[J].四川建筑科学研究,2006,32(6):121-124,127.
[3]周勇,朱彦鹏.兰州地区深基坑支护技术探讨[J].兰州理工大学学报,2007,33(5):109-113.
[4]李忠,朱彦鹏.框架预应力锚杆边坡支护结构稳定性计算方法及其应用[J].岩石力学与工程学报,2005,24(21):3922-3926.
[5]朱彦鹏,郑恒,李忠.框架预应力锚杆边坡支护结构稳定性分析[J].岩土力学,2006,27(增1):746-750.
[6]周勇,朱彦鹏.框架预应力锚杆边坡支护结构的稳定性分析方法及其应用[J].工程地质学报,2008,16(3):376-382.
[7]周勇,朱彦鹏.黄土地区框架预应力锚杆支护结构设计参数的灵敏度分析[J].岩石力学与工程学报,2006,25(增1):3115-3122.
[8]朱亚林,孔宪京,邹德高,等.预应力锚杆柔性支护的结构参数变化研究[J].安徽建筑工业学院学报:自然科学版,2003,11(4):30-36.
[9]周勇,朱彦鹏.基于梁柱扭转效应的框架预应力锚杆柔性支护结构内力计算[J].兰州理工大学学报,2009,35(2):116-121.
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