方格骨架防护型式对路基边坡浅层稳定性影响
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摘要
为了合理评价方格骨架防护结构对路基土质边坡浅层稳定性的影响,建立方格骨架防护下路基土质边坡浅层稳定安全系数方程,分析路基边坡方格骨架防护结构与骨架框格内土体之间的相互挤压摩擦及挡土作用。结果表明:设计中常用方格骨架防护型式可有效防止经雨水软化后的路基土质边坡浅层失稳破坏,安全系数Fs增幅达39%以上;减小方格骨架净距或增加骨架厚度,较加宽骨架宽度更能显著提高路基土质边坡浅层稳定性。
In order to rationally evaluate the influence of square skeleton protection structure on the shallow stability of subgrade soil slope,the squeezing friction and retaining action between the square skeleton protection structure and the soil in the frame were analyzed,and the safety factor equation of the shallow stability of subgrade soil slope under the square skeleton protection was established.The result shown that the square skeleton design can effectively prevent the shallow instability failure of the subgrade soil slope after rain softening,and the safety factor Fsincreases by more than 39 %;Reducing the net distance of the square skeleton or increasing the thickness of the skeleton can significantly improve the shallow stability of the subgrade soil slope than widening the width of the skeleton.
In order to rationally evaluate the influence of square skeleton protection structure on the shallow stability of subgrade soil slope,the squeezing friction and retaining action between the square skeleton protection structure and the soil in the frame were analyzed,and the safety factor equation of the shallow stability of subgrade soil slope under the square skeleton protection was established.The result shown that the square skeleton design can effectively prevent the shallow instability failure of the subgrade soil slope after rain softening,and the safety factor Fsincreases by more than 39 %;Reducing the net distance of the square skeleton or increasing the thickness of the skeleton can significantly improve the shallow stability of the subgrade soil slope than widening the width of the skeleton.
引文
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[3]中铁第四勘察设计院集团有限公司.铁路路基边坡防护(浸水地区)[R].北京:铁道部经济规划研究院,2014.
[4]铁道第三勘察设计院集团有限公司.铁路路基边坡防护(冻土地区)[R].北京:铁道部经济规划研究院,2014.
[5]温晓鹏.路基边坡拱形骨架护坡设计计算探讨[J].路基工程,2016(6):156-158.WEN X P.Discussion on design calculation of subgrade slope arch skeleton slope protection[J].Subgrade Engineering,2016(6):156-158.
[6]TB10025-2006铁路路基支挡结构设计规范(附条文说明)[S].北京:中国铁道出版社,2006.
[7]杨有海,夏琼.降雨对黄土路堤边坡浅层稳定性影响的研究[J].兰州交通大学学报(自然科学版),2004,23(3):98-101.YANG Y H,XIA Q.Study on rainfall infiltration effection on loess embankment slope shallow stability[J].Journal of Lanzhou Jiaotong University(Nature Science),2004,23(3):98-101.