摘要
研究目的:在铁路工程建设中,对于陡路基边坡,如坡率陡于1∶1的,难以有较好的绿色防护形式。针对山区高速铁路路基陡边坡的绿色防护难题,设计了预加固桩前框架锚杆内基材植生(生态袋)和复合式锚索墙基材植生(生态袋)两种新型的路基边坡支护结构,并开展了现场的原位试验研究,验证其适用性。研究结论:(1)预加固桩前框架锚杆内基材植生边坡深层变形从桩顶部向下逐渐减小,桩顶最大变形小于35 mm;(2)桩前框架锚杆受力约为设计值的1/5~1/7,预加固桩的土拱效应明显,大大减小了桩前框架锚杆受力;(3)复合锚索墙锚索锚固力约为设计值的1/2,锚索墙后深层位移小于35 mm;(4)两种新型路基边坡结构都是稳定的,路基边坡改进的厚层基材(生态袋)绿色生态防护效果好,植物成活率超过90%,植物覆盖率大于85%,实现了坡率1∶0.5陡路基边坡的全坡面绿色防护;(5)本研究成果可为路基陡边坡绿化防护提供参考。
Research purposes:In railway engineering construction,it is difficult to have a good green protection form for steep subgrade slope,such as the slope which rate steeper than 1∶1.In view of the difficult problem of green protection for steep slope of subgrade of high-speed railway in mountain area,two new types of subgrade slope supporting structures,namely pre-reinforced frame anchor rod with embedded base material(eco-bag)and composite anchor wall with embedded base material(eco-bag),were designed,and field test was carried out to verify its applicability.Research conclusions:(1)The deep deformation of the embedded slope in the anchor rod of the pre-reinforced frame decreases gradually from the top of the pile to the bottom,and the maximum deformation of the top of the pile is less than 35 mm.(2)The stress of the anchor rod of the pre-reinforced frame is about 1/5~1/7 of the designed value,the soil arching effect of the pre-reinforced pile is obvious,which greatly reduces the force on the anchor rod of the frame in front of the pile.(3)The anchoring force of the composite anchor wall is about 1/2 of the designed value,and the deep displacement behind the anchor wall is less than 35 mm.(4)The improved thick layer base material(ecological bag)has good effect of green ecological protection.The survival rate of plants is more than 90%,and the coverage rate of plants is more than 85%,the green protection of the whole slope with the slope ratio of 1∶0.5 is realized.(5)The results of this study can provide reference for the protection of subgrade steep slope greening.
作者
王祥
WANG Xiang(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430063,China)
出处
《铁道工程学报》
EI
CSCD
北大核心
2023年第12期102-107,共6页
Journal of Railway Engineering Society
基金
中铁第四勘察设计院集团有限公司科技开发计划课题
关键词
铁道工程
山区高速铁路
路基工程
绿色防护
railway engineering
mountain high-speed railway
subgrade engineering
green protection
作者简介
王祥,1970年出生,男,正高级工程师。
