冻融循环条件下风化花岗岩物理特性的实验研究  

Experiment study on physical characteristics in weathered granite under freezing-thawing cycles

作　　者：李杰林[1] 周科平[1] 张亚民[1] 许玉娟[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2014年第3期798-802,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51074178);高等学校博士学科点专项科研基金资助项目(20130162120012);中国博士后科学基金资助项目(2013M542138);中南大学博士后基金资助项目(126654)

摘　　要：为研究风化岩石在冻融循环作用下物理特性的变化情况,选取风化花岗岩为试样,在冻结温度为-40℃,融解温度为20℃条件下分别进行0,10,20和30次冻融循环实验,并进行单轴抗压强度测试。研究结果表明:风化岩石的质量在冻融后增大,且每组岩样的平均质量变化率随着冻融次数的增加而增大;随着冻融循环次数的增加,风化花岗岩的单轴抗压强度、弹性模量、冻融系数、风化程度系数都逐渐降低;在30次冻融循环作用下,岩样由中等风化岩变为强风化岩。To study the physical characteristics of weathered rock under the freezing and thawing cycles, the weathered granite were used as samples, and the different freezing-thawing cycles experiment of 0, 10, 20 and 30 cycles with the freezing temperature of -40 ℃ and thawing temperature of 20℃ were conducted. The uniaxial compressive strength tests were conducted. The results show that the rock qualities increase after freezing and thawing cycles, and the variation rate of average qualities increases with the increase of the freezing and thawing cycles. The uniaxial compressive strength, modulus of elasticity, freeze-thaw coefficient and weathering degree coeffictent decrease with the increase of the freezing-thawing cycles, and the granite becomes stronger weathered rock from medium weathered after 30 freezing-thawing cycles.

关 键 词：冻融循环 风化花岗岩 风化程度 寒区工程 

分 类 号：TU458.3[建筑科学—岩土工程]