岩质高挖方边坡锚杆参数优化设计研究

发布时间：2018-03-16 15:36

本文选题：岩质高挖方边坡　切入点：锚杆加固技术　出处：《岩土力学》2016年S2期 　论文类型：期刊论文

【摘要】：针对某220 kV变电站岩质高挖方边坡,采用极限平衡法和数值分析法,设置不同锚杆打入角度和长度方案对边坡的稳定性进行了计算对比分析,优化了锚杆设计参数,评价了坡顶位移监测、深层水平位移监测和锚杆应力监测对锚杆加固效果。结果表明,(1)随着锚杆打入角度的增加,边坡安全系数先增大后减小,存在最优锚固角度,确定22°为最优锚固角度;(2)边坡下部锚杆受力大于上部锚杆受力,设计时应有重点考虑下部锚杆参数。当边坡安全系数不满足设计要求时,应适当增大下部锚杆截面尺寸或增加锚杆长度;(3)各排锚杆应进行不等长设计,锚杆长度通过极限平衡法量取潜在滑动面到坡面的距离进行确定和验算;(4)现场监测结果显示优化设计后的锚杆参数加固效果良好,经济效益可观。
[Abstract]:Aiming at a 220 kV substation with high rock-quality excavated slope, the stability of the slope is calculated and analyzed by means of limit equilibrium method and numerical analysis method. The stability of the slope is calculated and analyzed with different bolt penetration angles and lengths, and the design parameters of the anchor rod are optimized. The effect of slope top displacement monitoring, deep horizontal displacement monitoring and anchor stress monitoring on anchor reinforcement is evaluated. The results show that the slope safety factor increases first and then decreases with the increase of anchor penetration angle, and there is an optimal anchoring angle. It is determined that 22 掳is the optimal anchoring angle.) the stress of the lower anchor rod is greater than that of the upper anchor rod, and the parameters of the lower anchor rod should be taken into account in the design. When the slope safety factor does not meet the design requirements, The section size of the lower anchor rod should be increased appropriately or the length of the anchor rod should be increased. (3) each row of anchors shall be designed for unequal lengths, The length of anchor rod is determined by the limit equilibrium method to determine the distance from the potential sliding surface to the slope surface and the field monitoring results show that the optimized design has good reinforcement effect and considerable economic benefit.
【作者单位】：中国电力科学研究院输变电工程研究所;
【分类号】：TU476

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