深部人工冻结土力学性质研究  

STUDY ON MECHANICAL PROPERTIES OF DEEP ARTIFICIAL FROZEN SOIL

作　　者：张亚欣 林斌[1] ZHANG Yaxin;LIN Bin(Anhui University of Science and Technology,School of Civil Architecture,Huainan Anhui 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《低温建筑技术》2024年第3期117-120,共4页Low Temperature Architecture Technology

基　　金：安徽省自然科学基金(2008085ME143);高校博士点专项基金资助项目(200803610004)。

摘　　要：为获取淮南某矿区土质在人工冻结条件下的力学性质,在不同的温度和含水率条件下,选取淮南某矿区不同深度不同土层进行单轴抗压强度试验和冻胀特性分析。结果表明通过回归分析,含水率和土层深度对于土样冻胀的影响大致相当;人工冻土的力学性质受温度、含水率、土层结构影响较大,随着温度梯度降低,四种土质的单轴强度均有提高;含水率对冻结土的抗压强度整体存在先增大后减小的趋势;-5℃时中砂的抗压强度整体较高,随着温度降低,应力-应变曲线强度特征较其他三种土质发生弱化。研究成果可为淮南矿区施工提供一定参考。In order to obtain the mechanical properties of soil in a mining area of Huainan under artificial freezing conditions.Under different temperature and moisture content,uniaxial compressive strength test and frost heave characteristic analysis were carried out on different soil layers at different depths in a mining area of Huainan.The results show that the effects of moisture content and soil depth on frost heaving of soil samples are roughly the same by regression analysis.The mechanical properties of artificial frozen soil are greatly affected by temperature,water content and soil layer structure.As the temperature gradient decreases,the uniaxial strength of the four soils increas⁃es.The effect of moisture content on the compressive strength of frozen soil initially increases and then decreases.The compressive strength of medium sand is generally higher at-5℃,and the strength characteristics of stress-strain curve weaken compared with the other three kinds of soil with the decrease of temperature.The re⁃search results can provide some reference for the construction of Huainan mining area.

关 键 词：人工冻土 冻胀特性 抗压强度 含水率 

分 类 号：TU43[建筑科学—岩土工程]