【摘要】 从无侧限抗压强度、直剪强度、加州承载比、含水率、无荷膨胀率、压缩性能的角度研究了掺砂改良高液限土的物理力学特性.研究结果表明:掺砂后改良土无侧限强度和直剪强度有较大提高,并存在一个较优的掺砂比例范围;在93%大压实度下,CBR值随着掺砂量的增加而增大,改良土CBR值均满足规范要求;掺砂改良高液限土干湿循环后最终稳定含水率随着掺砂量的增大而减小、膨胀性能减弱、压缩性能减弱;从改良物理力学特性指标及掺砂成本等方面综合考虑,掺砂改良高液限土掺砂比例宜为20%左右.更多还原

【Abstract】 This paper studied the physical and mechanical properties of improved high liquid limit soil mixed with sand from the perspective of unconfined compressive strength, direct shear strength, California bearing ratio, moisture content,free swelling ratio and compression performance. The results show that the unconfined compression strength and shear strength of improved soil increased greatly after sand was added and that there existed a reasonable proportion of sand content. Also, the CBR value increased with increases in sand content and the CBR value of improved soil could satisfy the regulatory requirements under great value of 93 %. Besides, the moisture content, expansive property and compression performance of sanding improvement of high liquid limit soil, decreased with increases in the amounts of sanding after drywet circulation. The reasonable proportion of sand content of improved soil was approximately 20 %, considering the improvement of physical and mechanical property index and costs, etc.更多还原