支护参数对锚固风化岩质边坡稳定性影响的数值分析

为分析不同支护参数对锚固高速公路风化岩质边坡稳定性的影响,通过FLAC3D软件建立数值计算模型,采用强度折减法计算不同支护参数下的边坡安全系数。研究结果表明,锚杆间距和锚杆长度有一定的相关性,当锚杆长度为6,9,12,15m时,对应锚杆间距分别取1.5,1.5,2,2m,锚杆加固效果较好;锚杆存在一定的有效锚固长度,在锚杆的有效锚固长度范围内,适当增加锚杆长度能够提高边坡安全系数;采用先短后长的长短相间和一级边坡采用短锚杆、二级边坡采用长锚杆这两种布设形式,能够更好地加固风化岩质边坡。

Numerical analysis of support parameters on the weathered rock slope stability

To study different support parameters on anchoring the weathered rock slope sta-bility,a numerical calculation model was established by FLAC3D,and the safety factor of the slope was calculated by the method of Lagrange strength reduction .The analysis results show that,（1）There is an certain relationship between spacing and length of anchor bolt. When the anchor length was 6,9,12 m or 15 m,anchor spacing was set for 1.5,1.5,2,2 m, which can better improve the stability of the slope;（2 ）Tere is an effective anchorage length.Lengthening anchor in the valid range properly can increase the slope safety factor;（3）Short first of long-short layout and the first layer of the slope with short bolts,the sec-ond layer of the slope with long bolts,which can better improve the stability of the weath-ered rock slope.