承载锚杆与非承载锚杆腐蚀力学性能对比试验研究

通过潮湿空气和Na2SO4溶液中的模拟腐蚀试验,得到腐蚀后承载锚杆和非承载锚杆力学性能与腐蚀条件以及腐蚀时间之间的关系曲线,对比两种腐蚀锚杆力学性能的差异,分析荷载对腐蚀锚杆力学性能的影响趋势。试验结果表明,在潮湿空气中,腐蚀后承载锚杆和非承载锚杆的力学性能之间并无显著性差异;而在Na2SO4溶液中,腐蚀后承载锚杆的极限承载力和最大伸长量都比非承载锚杆有较大程度的下降,其耐久性与使用寿命损失亦更加严重。

COMPARISON TEST STUDY ON MECHANICAL PERFORMANCE OF LOADED BOLT AND UNLOADED BOLT AGAINST CORROSION

By the simulation corrosion test of loaded and unloaded bolts in moist air and Na2SO4 solution,the relation curves of the mechanical performance with the corrosive conditions and the corrosion time are given.The mechanical performance is compared between these two types of bolts.At the same time,the influential trend of the load on the mechanical performance of the corroded bolt is analyzed.The test results show that:(1) after being corroded in the moist air,there is no prominent difference in mechanical performance between loaded bolt and unloaded bolt;but after being corroded in Na2SO4 solution,both the ultimate bearing capacity and the maximal tensility of loaded bolt decrease far more than those of unloaded bolt,and the endurance and service life of loaded bolt will also be shortened much more severely.