腐蚀磨损对SVP型材金属支架承载能力的影响及其使用寿命的降低

S. Gapeev, Vladyslav Kovalenko
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引用次数: 0

摘要

目的。确定腐蚀磨损对SVP型材截面阻力力矩对金属紧固件承载能力变化的影响,并为及时更换腐蚀损坏的金属紧固件提供建议。方法。对St5ps钢腐蚀速率随腐蚀时间的变化规律进行了实验室研究。在进行腐蚀试验时,采用了定量的腐蚀速率估计方法,其中包括权重法。利用施工力学的规定,对腐蚀磨损下SVP型材截面阻力矩的变化进行了分析研究。定义了St5ps钢的腐蚀速率与观察时间的关系。在分析研究腐蚀磨损引起的SVP型材截面阻力矩变化时,计算的是相同速度下SVP型材截面整个表面均匀腐蚀的情况。在腐蚀速率为0.24 mm/年时,计算了SVP-17、22、27、33型材的截面阻力矩(W)。确定了由于SVP型材抗腐蚀磨损轴向力矩引起的紧固件承载能力的变化。腐蚀磨损对来自SVP型材的紧固件承载能力影响的评估是基于拒绝腐蚀金属框架以重复使用的要求(SOU 10.1.00185790.011:2007)。为及时更换因腐蚀损坏的金属紧固件提供建议。的创意。提出了一种确定在达到SVP剖面最小允许壁厚期间,剖面在矿井水作用下自运行以来的承载能力损失(单位:%)的方法。实际的实现。采用所提出的确定型材在矿井水作用下运行时的承载能力损失(单位%)的方法,可以显著提高用金属紧固件固定的产品的稳定性,并建立SVP型材17,22,27,33的临界时间范围。在这种情况下,预计容易腐蚀的紧固框架的承载能力将急剧下降,并应作出决定,恢复矿井工作中支架的承载能力。在计算所需支承架数时,建议使用表征型材和支座承载能力损失程度的腐蚀磨损修正系数。关键词:腐蚀磨损,金属试样,截面阻力矩(W), SVP型材,承载力损失。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
INFLUENCE OF CORROSIVE WEAR ON THE BEARING CAPACITY OF METAL SUPPORT OF SVP PROFILE AND THE REDUCTION OF ITS SERVICE LIFE
Purpose. Determining the effect of corrosion wear on the change in the load-bearing capacity of a metal fastener due to the moment of resistance of the cross section of the SVP profile and providing recommendations for the timely replacement of metal fasteners damaged by corrosion. Methods. Laboratory studies of the dependence of the corrosion rate of St5ps steel on the time of observation under conditions of periodic wetting with aggressive mine waters were carried out. When conducting corrosion tests, quantitative methods of corrosion rate estimation were used, which include the weight method. Using the provisions of construction mechanics, analytical studies of the change in the moment of resistance of the cross-section of the SVP profile from corrosive wear were carried out Results. It is defined the dependences of the corrosion rate of St5ps steel on the time of observations. In the analytical studies of the change in the moment of resistance of the SVP profile section due to corrosion wear, the calculation was carried out for the case of uniform corrosion over the entire surface of the SVP profile section at the same speed. The moments of cross-sectional resistance (W) of SVP-17, 22, 27, 33 profiles were determined considering corrosion wear at a corrosion rate of 0.24 mm/year. Changes in the load-bearing capacity of the fastener due to the axial moment of resistance of the SVP profile from corrosive wear are determined. The assessment of the impact of corrosion wear on the load-bearing capacity of fasteners from the SVP profile is based on the requirements for rejecting corroding metal frames for reuse (SOU 10.1.00185790.011:2007). Recommendations are provided for the timely replacement of metal fasteners damaged by corrosion. The originality. It is proposed a methodology for determining the loss of the load-bearing capacity of the profile (in %) from the time of its operation under the action of mine water during the period when the minimum permissible wall thickness of the SVP profile is reached. Practical implementation. The use of the proposed method of determining the loss of the load-bearing capacity of the profile (in %) from the time of its operation under the action of mine water allows to significantly increase the stability of products fixed with metal fasteners, as well as to establish critical time ranges for SVP profiles 17, 22, 27, 33, in which a critical decrease in the load-bearing capacity of corrosion-prone fastening frames should be expected and a decision to restore the load-bearing capacity of the support in mine working should be made. In the calculations of the required number of supporting frames, it is proposed to use the correction coefficient of corrosion wear, which characterizes the degree of loss of the load-bearing capacity of the profile and support. Keywords: corrosion wear, metal samples, moment of section resistance (W), SVP profiles, loss of bearing capacity.
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