土钉支护参数对土质路堑边坡稳定性的影响  

Influence of soil nail supporting parameters on the stability of soil cutting slope

作　　者：牟丹 MOU Dan(Shanxi Transportation Planning Survey and Design Institute Co.,Ltd.,Shanxi Taiyuan 030032 China)

机构地区：[1]山西省交通规划勘察设计院有限公司,山西太原030032

出　　处：《山东交通科技》2022年第1期50-52,共3页

摘　　要：从影响土钉支护结构支护效果的敏感因素出发,通过某一路堑边坡截面,应用有限元软件建立路堑边坡模型,研究土钉布设位置、直径、间距对边坡土体稳定性的影响。研究结果表明:根据布设位置的不同,土钉拉应力的最大值在土钉布设于中部时取得,安全系数在下部加钉时最大;随着土钉布设间距的增加,土钉所受拉应力的增长趋势呈抛物线形,安全系数的增长趋势呈线性;土钉所受拉应力随着其直径的增大而逐渐减小,安全系数在土钉直径为100 mm时达到最大。从安全系数的增长速率以及数值大小分析出,边坡土体安全系数对加钉部位最为敏感,对间距的敏感性次之,对土钉直径的敏感性最低,甚至基本不受影响。Starting from the sensitive factors affecting the supporting effect of soil nailing structure,the cutting slope model was established using finite element analysis software through a certain cutting slope section.The position,diameter and spacing of soil nails were studied.The effect of slope soil stability,the research results show that:according to the different placement positions,the maximum soil nail tensile stress is obtained when the placement position of the soil nails is in the middle,and the safety factor is the largest when the bottom is nailed.With the increase of the laying spacing,the growth trend of the tensile stress of the soil nails is parabolic,and the growth trend of the safety factor is linear.The tensile stress of the soil nail gradually decreases with its increasing diameter,and the safety factor is the maximum when the soil nail diameter is 100 mm.From the growth rate and value of the safety factor,it can be analyzed that the safety factor of the slope soil is the most sensitive to the nailing position,followed by the sensitivity to the spacing,and the least sensitive to the diameter of the soil nail,or even basically not affected.

关 键 词：土质边坡 土钉参数 强度折减法 稳定性 

分 类 号：TU413.16[建筑科学—岩土工程]