洞室土钉瞬态应力实验及粘弹性模型

Experiment on Transient Stresses in Soil Nails of Cavern and Viscoelastic Model

基于探索性的洞室土钉支护试验,罗列了洞室土钉支护抗动载试验的基本参数,并给出了洞室拱顶土钉的测试数据.依照实验数据,考察对比了毛洞段与土钉支护段的瞬态应力增量和炸药药量的关系,及其二者的瞬态应力增量和加载次数的关系,发现毛洞段具有较好的降低应力的能力.依照一维粘弹性理论对拱顶土钉进行了Maxwell模型的拟合.并用此模型确定了土钉用建筑钢的动力粘性因数,其与毛洞前拟合公式的相近.

This paper bases on a seeking experiment of soil nails of cavern. It summarizes the key elements of the field test on dynamic resisting force of the loess cavern and gives the test results of the soil nails on top of the arch. According to the phenomena of the experiment, it contrasts the naked eavern , the soil nail support cavern on the relationship of the transient stress and the TNT quantity. It contrasts them on the relationship of the transient stress and the loading order, too. The naked cavern has the better ability of dying down the strain. The one - dimension viscoelastic Maxwell model is used in data fitting.In addition, it uses the same model to find the dynamic viscoelastic factor of building steel bar. The factor is approach to the naked cavern ones.