麦秸秆加筋石灰粉土冻结温度试验研究

Research on Freezing Temperature of Silt Reinforced with Wheat Straw and Lime

针对低液限粉土,分析了石灰掺量、麦秸秆掺量、麦秸秆长度对其冻结温度的影响。结果表明:粉土、秸秆加筋粉土冻结温度均随石灰掺量的增加而降低,且相同石灰掺量下,秸秆加筋粉土的冻结温度比粉土降低约1倍以上;相同秸秆长度下,粉土冻结温度随秸秆掺量的增加呈线性规律降低,但总体降幅较小;相同石灰掺量、麦秸秆长度下,石灰粉土冻结温度随麦秸秆掺量的增加而降低;相同秸秆长度、掺量下,石灰粉土冻结温度低于粉土;秸秆掺量一定时,较短秸秆长度对粉土冻结温度影响不大,而对于石灰粉土,冻结温度随麦秸秆长度的增加呈先升高后降低的趋势。不同影响因素对土体冻结温度的影响程度为石灰大于秸秆。

For the low liquid limit silt,the effects of lime content,wheat straw content,and wheat straw length on its freezing temperature are analyzed.The results show that the freezing temperature of silt and straw-reinforced silt decreases with the increase of lime content.With the same content of lime,the freezing temperature of straw-reinforced silt is about 1times lower than that of silt.At the same straw length,the freezing temperature of silt decreases approximately linearly with the increase of straw content,but the overall decrease is small.With the same lime content and wheat straw length,the freezing temper-ature of lime silt decreases with the increase of wheat straw content.At the same length of the wheat straw,the freezing temperature of lime silt is lower than silt with the same content of wheat straw.When the content of wheat straw is the same,the shorter straw length has minor impact on the freezing tempera-ture of silt,while for lime silt,the freezing temperature increases first and then decreases with the increase of wheat straw length.The influence degree of different influencing factors on soil freezing temperature is that the lime has greater effect than the straw does.