正融土强度弱化特性研究的试验仪器及方法  

Apparatus and Methods to Study the Weakening Characteristic of Frozen Soil Thawed

作　　者：钱春香[1] 温立光[2] 刘彤 田亚护[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]呼和浩特铁路局,呼和浩特010020 [3]中铁九局二公司,吉林132001

出　　处：《北京交通大学学报》2007年第4期71-74,共4页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(50678020);教育部新世纪优秀人才计划项目(NCET-05-0092)

摘　　要：冻土,特别是含冰透镜体的冻土解冻时,出现强度大幅度下降的弱化现象,这是季节冻土区内路基春季翻浆冒泥、地基失稳的重要原因.为探明路基土融化过程中的强度弱化机理,在此基础上制定有效的冻害预防措施,对国产土工静力三轴仪进行了一系列改造,并配以专用的冻土试样制备设备、冻土试样融化加热设备和外部保温设施,共同制成冻土解冻时的强度弱化试验仪.用该仪器进行了相关试验研究,结果表明,仪器得到的数据合理有效,该仪器设备可以在冻土学研究中推广应用.The strength of frozen soil will decrease obviously if it is thawed, especially when ice lens is abundant in it, which is the main cause of the mud pumping in subgrade as well as the instability of foundation in seasonal frozen ground regions. In order to find out the mechanism of the soil strength weakening during the period of thawing and the effective prevention measures, some adjustment was made on the traditional triaxial apparatus, together with special frozen soil samples preparation equipment, customized frozen soil samples thawing apparatus and external heat preservation facilities, a new apparatus for investigating the weakening characteristic of frozen soil was made successfully. Having been used in several tests, the new apparatus proves to be very accurate and applicable in the research field of frozen soil.

关 键 词：三轴仪 冻土 弱化特性 试验 

分 类 号：TU411.7[建筑科学—岩土工程] TU415[建筑科学—土工工程]