冻融作用对松浦大桥段岸坡土体压缩性的影响

为了研究冻融作用对松浦大桥段岸坡土压缩性的影响,对该段岸坡土进行了基本物理参数测试、冻融实验和标准固结实验。结果表明,试样在冻融后孔隙比均有大幅度增加。相同固结压力作用下,孔隙比随冻结温度的下降而增大;相同冻结温度条件下,固结压力较小时,试样孔隙比随着冻融循环次数的增加同比增大,随着压力的增加,冻融循环次数对孔隙比的影响不尽明显;试样的压缩性随冻结温度的降低和冻融循环次数的增加而增大;试样的压缩模量随冻结温度的下降和冻融循环次数的增加而逐渐减小,试样压缩变形逐渐增大。

Effects of freeze-thaw on soil compressibility in bank slope in Songpu bridge section of Songhua River

This paper is an attempt to investigate the effects of freeze-thaw on soil compressibility in the bank slope in Songpu bridge section of Songhua River,by testing basic physical parameter,freezethaw and standard consolidation.The investigation shows that freeze-thaw is followed by a substantial increase in the void ratio of sample.The void ratio,acted on by the same consolidation pressure,tends to increase with the decline of freezing temperature.The smaller consolidation pressure occurring in the same condition of freezing temperature means that the greater number of freeze-thaw cycle results in the bigger void ratio of sample.The increase in pressure is accompanied by the absence of obvious effects of the number of freeze-thaw cycle on the void ratio.The decreased freezing temperature and increased number of freeze-thaw cycle produce increased compressibility of sample and gradually decreased compression modulus,and gradually increased compression deformation of sample.