锚杆支护加固效果评价常依赖锚杆轴力的监测,但边坡中影响锚杆轴力的因素众多,故分析锚杆轴力的成因具有重要的意义。借助某高速公路超高岩质边坡的锚杆轴力监测,定性分析影响锚杆轴力大小的因素,然后针对各因素定量化,建立锚杆轴力多元线性回归模型,进而剥离温度影响,计算所受边坡变形影响的真实轴力,准确评价锚杆的加固效果,降低对边坡变形破坏的误判。将本方法成功应用于锚杆MGZ1042测点真实轴力的计算,通过剥离温度影响,锚杆轴力由原来的100 kN降至真实轴力40 kN,未超过锚杆轴力监测警戒值60 kN,从而正确判断了边坡变形破坏趋势。

Anchor bolt support is commonly used in slope reinforcement. Analysis on the causes of anchor’s axial force is of vital significance as the assessment of reinforcement effect is often dependent on the anchor’s axial force which is influenced by many factors. In this article, a multiple linear regression model of anchor’s axial force was established for a ultra-high rock slope of an expressway. Firstly, factors affecting the axial force were analyzed in qualitative terms, and then the factors were quantified. Furthermore, the real axial force was calculated in no consideration of temperature influence. The aim is to accurately assess the anchorage effect and reduce misjudgment of slope deformation. The model was applied to the calculation of real axial force at point MGZ1042 of the anchor bolt. In the absence of the influence of temperature, the axial force fell from 100kN to 40kN, not exceeding the monitoring alarm value 60 kN.