不同冻结温度下黄土三轴压缩力学性能试验  

Experiment on the mechanical properties of loess under triaxial compression at different freezing temperatures

作　　者：张铜川 ZHANG Tongchuan(Shaanxi Yanchang Petroleum Jingbian Coal Industry Co.,Ltd.,Yulin 718500,China)

机构地区：[1]陕西延长石油靖边煤业有限公司,陕西榆林718500

出　　处：《陕西煤炭》2024年第6期39-43,共5页Shaanxi Coal

摘　　要：准确掌握不同冻结温度下的黄土力学性能是人工冻结法设计过程中进行合理设计和安全施工的前提和必要条件。通过设计正交试验及统计拟合,研究了海测滩煤矿立井井筒处黄土冻土试样在不同冻结温度下的三轴压缩力学性能,分析了冻结温度对冻结黄土应力-应变曲线影响,对比了不同冻结温度下冻土内聚力及内摩擦角变化规律,并对立井井筒黄土基土在冻结过程中的内聚力及内摩擦角提出了基于冻结温度变化的预测模型。结果表明,冻结温度对黄土试样三轴压缩力学性质具有明显的影响,黄土试样粘聚力与冻结温度呈线性相关,随着冻结温度的降低而增大,内摩擦角与冻结温度呈指数关系,随着冻结温度的降低先增大,随后趋于稳定。Accurately grasping the mechanical properties of loess under different freezing temperatures is a prerequisite and necessary conditions for rational design and safe construction in the design process of artificial freezing method.By designing orthogonal test and statistical fitting,the triaxial compression mechanical properties of loess frozen soil samples at the shaft of Haicetan Coal Mine were studied under different freezing temperatures.The influence of freezing temperatures on the stress-strain curve of frozen loess was analyzed,and the changes in the cohesive force and internal friction angle of frozen soil under different freezing temperatures were compared.A prediction model based on the change of freezing temperature was proposed for the cohesive force and internal friction angle of loess foundation soil in the shaft during the freezing process.The results show that the freezing temperature has a significant impact on the triaxial compression mechanical properties of loess samples.The cohesion of loess samples is linearly correlated with the freezing temperature,increasing with the decrease of freezing temperature.The internal friction angle is exponentially related to the freezing temperature,increasing first with the decrease of freezing temperature and then stabilizing.

关 键 词：立井井筒 冻结法 人工冻土 三轴压缩 力学性能 

分 类 号：TD262[矿业工程—矿井建设] TU444[建筑科学—岩土工程]