Field Text Study on Squeeze-expansion Anchor Rods for Subgrade Filling
Based on the emergency rescue project of the water damaged slope in the Jiexi-Boluo section of the Shantou-Zhanjiang Expressway,field tests were conducted on the subgrade filling and squeeze-expansion anchor rods.The mechanical characteristics of ordinary anchor rods,single-plate squeeze-expansion anchor rods,and double-plate squeeze-expansion anchor rods were compared and studied.The research results show that the proportion of tensile force borne by ordinary anchor rods in the first 3 m of the anchorage section(from the end point of the free section of the anchor rod to the anchorage section to 3 m)is 33.35%.The proportion of tensile force borne by the first 3 m of the single-plate anchor rod anchorage section is 56.65%,while the proportion of tensile force borne by the first 3 m of the double-plate anchor rod anchorage section is 61.5‰.The measured ultimate pull-out bearing capacity of single-plate anchor rod is 1.89 times that of ordinary anchor rod,and the measured ultimate pull-out bearing capacity of double-plate anchor rod is 1.73 times that of ordinary anchor rod.Compared with ordinary anchor rods,single-plate anchor rods and double-plate anchor rods have a lower proportion of plastic displacement and good deformation control.Single-plate anchor rods and double-plate anchor rods have good working characteristics and are suitable for engineering applications that can withstand high loads.
subgrade fillingsqueeze-expansion anchor rodon site testingsqueeze-expansion support plateultimate tensile bearing capacity
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