高液限土路基填料改良的试验研究

针对高液限土含水率高、水稳定性差等特点,采用生石灰和水泥两种材料进行改良处理,通过一系列的室内试验研究了不同掺量下改良土的物理性质、CBR值、水稳性以及干湿循环强度特性.结果表明,高液限土掺水泥改良后CBR值随掺量线性增长,而生石灰在掺量超过4%后CBR值变化平缓;掺量对高液限改良土的水稳定性有显著的影响,生石灰和水泥的掺量分别低于4%和6%时水稳定性较差.综合考虑CBR值、水稳定性以及干湿循环无侧限抗压强度特征等因素,掺4%生石灰或7%水泥改良后,高液限土可用作高速公路的路基填料.

Experimental Study on Improvement of High Liquid Limit Soil Roadbed Filling

Based on high moisture content and poor water stability of high liquid limit soil,a series of indoor experiments were completed by adding different dosages of lime or cement to modify high liquid limit soil ,and the physical properties,CBR value,water stability and strength characteristics of wetting-drying cycles were analyzed. Results show that CBR value increases linearly with cement dosage,and changes smoothly when the ratio of lime is more than 4%. The dosage of cement and lime has obvious effect on improving the water stability of high liquid limit soil,the water stability is poor when lime dosage is less than 4%and cement dosage is less than 6%. Considering CBR value,water stability and the unconfined compressive strength characteristic of wetting-drying cycles ,the high liquid limit soil could be used as roadbed filling when treated with 4%lime or 6%cement .