煤矿安全2019，Vol.50Issue(11)：216-219,4.DOI:10.13347/j.cnki.mkaq.2019.11.50
西北地区风化岩土体冻结特性及抗压强度分析
Analysis of Freezing Characteristics and Compressive Strength of Weathered Rock Mass in Northwest China
刘巍 1张付涛 2刘立民3
作者信息
- 1. 榆阳中能袁大滩矿业有限公司,陕西 榆林 719000
- 2. 山东方舟新材料有限公司,山东 泰安 271026
- 3. 山东科技大学 矿业与安全工程学院,山东 青岛 266590
- 折叠
摘要
Abstract
The loose layer of Yuheng Mining Area in Jurassic coalfield in northern Shaanxi is thick and the weathering of the rock is serious. Freezing wellbore construction design needs to be based on the freezing characteristics and mechanical parameters of topsoil and weathered rock. At present, the freezing characteristics and mechanical properties of weathered rock and soil have not been studied. Based on the sampling of borehole weathered rock soil in Yuheng Mining Area, the experimental study on freezing temperature, frost heaving characteristics and freezing uniaxial compression of fine sand, clay, fine sandstone, siltstone and sandy mudstone specimens was carried out. The results show that the freezing temperature of topsoil is between -1.0 °C and -1.5 °C. The freezing temperature of weathered rock layers is relatively low, ranging from -2.5 °C to -3.0 °C. The frost heaving rate and frost heaving force of topsoil are significantly larger than that of weathered rock. With the decrease of freezing temperature, the compressive strength of the test piece gradually increased, and the growth rate showed an increasing trend. The freezing tempera-ture increases the compressive strength of fine sand, clay and siltstone relatively, and the reinforcement of fine sandstone and sandy mudstone is relatively small.关键词
风化岩土体/冻结温度/冻胀特性/单轴抗压强度/冻胀率/冻胀力Key words
weathered rock and soil/ freezing temperature/ frost heaving characteristics/ uniaxial compressive strength/ frost heave rate/ frost heaving force分类
矿业与冶金引用本文复制引用
刘巍,张付涛,刘立民..西北地区风化岩土体冻结特性及抗压强度分析[J].煤矿安全,2019,50(11):216-219,4.
