滨海软土地层人工冻土蠕变试验研究

Study on Creep Test of Artificial Frozen Soil in Coastal Soft Soil Layer

天然岩土通过人工冻结,其各项力学性能都会发生变化,为了更好地研究滨海软土地层人工冻土的蠕变性能,本文对福州地铁2号线各车站典型地层做了系统针对性试验研究。针对原状土样,在尽量减小扰动情况下,进行室内冻结试验,根据试验可得:相同温度下含水量较小的冻结土单轴抗压强度更大;当仅考虑非稳定蠕变阶段和稳定蠕变阶段时,蠕变可以用方程ε=Aσ~Bt^C描述。

The mechanical properties of natural rock and soil will be changed by artificial freezing. In order to better study the creep performance of artificial frozen soil in coastal soft soil layer,this paper has done a systematic study on the typical strata of the subway stations in Fuzhou Metro Line 2. For the undisturbed soil samples,an indoor freeze test was conducted with minimum disturbance. According to the test,the uniaxial compressive strength of the frozen soil with the smaller water content at the same temperature is greater; When only the unstable creep stage and the stable creep stage are taken into account,the creep equation can be written as ε = Aσ^Bt^C.