西宁～果洛沿线冻土性质试验研究

Study of Frozen Soil Properties along Xining-Guoluo Highway

为了减少冻土区工程地质灾害,提高建筑物耐久性,进行冻土性质的研究。文中对西宁~果洛沿线冻土进行了强度-温度试验与温度-沉降变形试验。试验结果表明,0℃以下时,环境温度越高,冻土强度越低;低温冻土到高温冻土,冻土的破坏形式由脆性破坏过渡到塑性破坏;随温度升高,冻土沉降变形速率不同,-1℃以下沉降变形基本不随温度变化而变化,-1℃~1℃沉降变形随温度升高骤然增大,1℃以上沉降变形随温度升高成线性增长;初始环境负温越低,最终沉降变形量越大。

In order to reduce engineering geological disaster in permafrost region,improve the durability of structures and study the properties of frozen soil,strength-temperature and temperaturesettlement deformation tests are conducted against the frozen soil along the Xining to Guoluo Highway.The tests results show that when below 0℃,the strength of frozen soil is lower as the environmental temperature is higher;the failure form of frozen soil changes from brittle fracture to plastic failure during low frozen soil changing to high temperature frozen soil;with the increase of temperature,the settlement deformation rate of frozen soil is different,the settlement and deformation do not change with the change of temperature when the temperature is below-1℃;between-1℃~1℃the settlement and deformation of frozen soil increase rapidly with the increase of temperature.Higher than 1℃ the settlement and deformation of frozen soil increase linearly with the increase of temperature;and the lower the initial negative temperature,the greater the final settlement deformation.