摘要
水泥加固红土的击实、剪切、压缩和渗透等受力特性及其微结构特征受到水泥加入比例和试样养护时间的影响。研究结果表明,水泥加固红土存在最佳击实制样时间,水泥加入越多,最大干密度越大、最优含水率越小。其抗剪强度和抗剪强度指标随水泥加入比例的增加和试样养护时间的延长逐渐增大,但增大的程度逐渐减慢,对粘聚力的影响大于对内摩擦角的影响;其压缩性和渗透性随水泥加入比例的增加和试样养护时间的延长显著减小,但减小的程度逐渐变缓;水泥加入比例的影响大于试样养护时间的影响。实质上,水泥的加入和试样的养护导致水泥加固红土呈现出包裹、填充和胶结的微结构特征,引起水泥加固红土的击实、剪切、压缩和渗透等力学特性的宏观变化。
Mechanical properties such as compaction,shearing,compression,penetration and micro-structure characteristics of laterite strengthened by cement are changed with cement content and curing history.The research results show that there is an optimal moment after laterite is mixed with cement as compacted samples and that for samples,the more the cement added to laterite,the bigger the maximum dry density and the smaller optimal water content of the laterite.The shear strength of the strengthened laterite increases with increasing cement and longer cuing history but the increment of the strength decreases and its effect on cohesion is greater than on internal friction angle.The compression and penetration of laterite strengthened by cement are weakened with more cement and longer curing history but the decrement slows down and the function of cement is stronger than that of curing history.In fact,the addition of cement and sample cuing make laterite micro-structures to be wrapped,filled and cemented so that the macro-mechanical properties of strengthened laterite are changed.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2012年第4期80-87,共8页
Hydrogeology & Engineering Geology
基金
国家自然科学基金项目(50868009
51168022)
关键词
水泥加固红土
水泥加入比例
试样养护时间
力学特性
微结构特征
strengthened laterie with cement
cement content
sample curing history
mechanical properties
micro-structure characteristic
