掺砂改良高液限土物理力学特性的试验研究
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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.
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.
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.
引文
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[5]徐奋强,洪宝宁,孟云梅.高液限土路基掺沙改良路用特性试验[J].水利水电科技进展,2014,34(6):76-81.
[6]卢自立,曹亮宏,程涛.掺砂高液限土加州承载比影响因素试验[J].水利水电科技进展,2013,33(5):65-68.
[7]程涛,洪宝宁,程江涛.干湿循环下高液限土力学特性研究[J].四川大学学报(工程科学版),2013,45(6):83-86.
[8]吴家旺.掺砂和水泥改良高液限土的试验研究[J].湖南交通科技,2013,39(3):21-23.
[9]程涛,洪宝宁,刘鑫,等.高液限土最佳掺砂比的确定[J].西南交通大学学报,2012,47(4):580-585.
[10]徐奋强,郭先凯.高液限土路基掺砂改良试验研究[J].科学技术与工程,2013(33):10054-10058.
[2]曾宪新,钟扬有.掺砂改良高液限土修筑路基技术研究[J].广东交通职业技术学院学报,2005,4(1):13-15.
[3]李方华.高液限土填料改良的最佳掺砂砾石比试验研究[J].岩土力学,2010,31(3):785-788.
[4]刘鑫,洪宝宁.高液限土工程特性与路堤填筑方案[J].河海大学学报(自然科学版),2011,39(4):436-443.
[5]徐奋强,洪宝宁,孟云梅.高液限土路基掺沙改良路用特性试验[J].水利水电科技进展,2014,34(6):76-81.
[6]卢自立,曹亮宏,程涛.掺砂高液限土加州承载比影响因素试验[J].水利水电科技进展,2013,33(5):65-68.
[7]程涛,洪宝宁,程江涛.干湿循环下高液限土力学特性研究[J].四川大学学报(工程科学版),2013,45(6):83-86.
[8]吴家旺.掺砂和水泥改良高液限土的试验研究[J].湖南交通科技,2013,39(3):21-23.
[9]程涛,洪宝宁,刘鑫,等.高液限土最佳掺砂比的确定[J].西南交通大学学报,2012,47(4):580-585.
[10]徐奋强,郭先凯.高液限土路基掺砂改良试验研究[J].科学技术与工程,2013(33):10054-10058.