冻融循环作用下路基土回弹模量试验研究  

Experimental Study of Resilience Modulus of Subgrade Soil under Circles of Freezing and Thawing

作　　者：王威娜[1] 支喜兰[1] 毛雪松[1] 侯仲杰[1] 雷明轩[1,2] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]巾交铁道勘察设计院有限公司,北京100007

出　　处：《冰川冻土》2010年第5期954-959,共6页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(50708009);西部交通建设科技项目(200731822301-1);西部交通建设科技项目(2009318000027)资助

摘　　要：为研究季节冻土地区冻融循环作用对路基土回弹模量的影响,以2种路基土作为研究对象,通过风干和加湿的方法,使高50mm、直径为50mm无侧限圆柱体试件达到5种预期含水率;采用承载板法进行回弹模量试验,分析了路基土在0～12次冻融循环作用下,回弹模量随冻融循环次数变化的规律.结果表明:随着冻融循环次数的增加,土体的回弹模量减小,到第6次冻融循环后土体回弹模量衰减基本稳定.在进行季节冻土地区路面设计时,应考虑冻融循环作用对路基土的影响,建议选取第6次冻融循环后的土体回弹模量作为路基强度设计值.In order to study the influence of circles of freezing and thawing on the resilience modulus of subgrade soil,two types of subgrade soil in seasonally frozen ground regions were taken as the research object.Unconfined cylindrical specimens in the height of 50mm and in the diameter of 50mm were tested in drying process and humidification process with five expected water contents.The resilience modulus test was carried out using bearing plate method.The maximum freezing and thawing cycles was 12.The mechanical properties of subgrade soil after the circles of freezing and thawing were analyzed.It is found that after six circles,the decreasing of resilience modulus was no longer obvious with the increasing of the number the circles.Therefore,for the pavement design in seasonally frozen ground regions,the influence of freezing and thawing circles on the resilience modulus of subgrade soil should be considered.It is suggested that the soil resilience modulus of the sixth circles of freezing and thawing should be taken as the design value.

关 键 词：路基土 冻融循环 含水率 回弹模量 承载板法 

分 类 号：P642.14[天文地球—工程地质学]