水泥搅拌法改良桂林红黏土力学性质试验研究

LABORATORY TEST FOR MECHANICAL PROPERTIES OF GUILIN RED CLAY MIXED WITH CEMENT

桂林地区分布的由碳酸盐系出露区的石灰岩经过红土化作用而成的高塑限的红黏土,孔隙比较大、含水量高,而其结构性强且存在上硬下软的成层分布特征,上部红黏土为坚硬-硬塑状态,承载力高,下部红黏土为软塑、流塑状态,为地基软弱下卧层,需进行处理。采用水泥搅拌法对桂林软弱红黏土无侧限抗压强度、抗剪强度、抗拉强度与水泥掺入比、龄期的关系等主要力学性质进行室内试验研究,得出外掺剂对无侧限抗压强度的影响以及无侧限抗压强度、抗拉强度与抗剪强度的关系。结果表明:运用水泥搅拌法对桂林地区软弱红黏土层主要力学性能的无侧限抗压强度与水泥掺入比、龄期之间以及含外掺剂和无外掺剂水泥红黏土无侧限抗压强度之间存在较好的相关性;黏聚力、抗拉强度随水泥掺入比、龄期增大而增大;无侧限抗压强度、抗拉强度与黏聚力存在相关性。

The exposed carbonate limestone area at Guilin has red clay of high plastic limit. The clay was formed by laterization from limestone. Its pores are large and have high water contents It has the character of strong two layer structure. The upper layer is hard and the lower layer is soft. The upper clay has the rigid and hard plastic condition and high bearing capacity. The lower clay is soft plastic, has flowing plastic condition and weak bearing capacity. It needs treatment. This papers uses the soil-cement mixing method to treat the soft red clay. Laboratory tests are done on the mechanical properties of the cemented soils. The test results include the deformation of character and strength of the cemented clays taking into account the effects of cement-soil ratio and age.