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根据强风化岩地区锚桩基础的试验、研究和应用情况,结合烟台220kV新港输电工程中对强风化岩扩底锚桩直线塔基础的设计,认为:试验单锚桩应采用抗拉(屈服)强度高的锚杆和高标号混凝土(可固结锚杆减少弹性变形量);锚杆抗拉强度设计值大于试验拉应力最大值,破坏性的试验结果才能够正确反映单锚桩和直锚桩在弹性变形范围内岩体的极限抗剪承载力、锚桩与岩体间的极限粘结承载力;锚杆增加锚板和锚孔扩底等强锚固措施可改善锚杆上部内力集中的现象,增强锚桩基础的抗拔稳定性。
Based on the experiments, research and application of anchor pile foundations in areas with strong weathered rock, combined with the design of Yantai 220kV Xingang Transmission Project for the foundation of strong weathered rock with expanded bottom anchoring towers, it is considered that the tensile strength (yield) should be applied to the test anchor piles. High-strength bolts and high-grade concrete (concrete anchor bolts can reduce elastic deformation); the design value of anchor tensile strength is greater than the maximum value of test tensile stress, and the destructive test results can correctly reflect single anchor piles and straight anchors. The ultimate shear bearing capacity of the pile in the elastic deformation range, the ultimate bond capacity between the anchor pile and the rock mass; the anchorage bolts and anchoring holes to increase the bottom and other strong anchorage measures can improve the internal force of the upper part of the bolt Phenomenon, enhance the pullout stability of the anchor pile foundation.