锚杆长短相间布置形式对边坡稳定性的影响

来源期刊:中南大学学报(自然科学版)2015年第2期

论文作者:林杭 陈宝成 范祥 李江腾 吴启红

文章页码:625 - 631

关键词:锚杆;长短相间;布置形式;边坡;稳定性

Key words:bolt; long-short; layout; slope; stability

摘    要:采用基于拉格朗日元的强度折减法进行边坡稳定性分析,将锚杆布设形式分为长短相间型、一长两短型和一短两长型,研究长短相间锚杆的布置形式对边坡安全系数及滑动面位置的影响。研究结果表明:随着长锚杆长度增加,短锚杆长度减小,边坡的安全系数逐渐增加,潜在滑动面向边坡内发展;当长锚杆达到一定长度足以穿过滑动面且长、短锚杆的长度差较大时,才会出现长、短相间锚固效应;增加位置靠下的锚杆长度比增加相对靠上的锚杆长度更加有利于边坡安全系数的提高。

Abstract: The strength reduction method based on the Lagrange numerical method was used to analyze the stability of slope, the bolt was divided into three types, i.e. long-short layout, one-long and two-short layout, one-short and two-long layout, and the effect of bolt layout on the safety factor and slip surface of slope was studied. The results show that with the increase of the length of long bolt and the decrease of the length of short bolt, the factor of safety of slope increases gradually, and the potential slip surface moves gradually to the inner slope. If the long bolt is long enough to pass through the slip surface, and the differences between the long and short bolt is large enough, the effect of anchoring will exert. It is better for increasing the slope safety factor by increasing the length of bolts at the lower part of slope than by increasing the length of bolts at the upper part of slope.

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