正融土强度弱化特性研究的试验仪器及方法

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.

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

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.