EFFECTS OF SMALL CEMENT CONTENT ON CONSOLIDATION BEHAVIOR OF A LACUSTRINE CLAY
EFFECTS OF SMALL CEMENT CONTENT ON CONSOLIDATION BEHAVIOR OF A LACUSTRINE CLAY
复制标题
小量水泥含量对湖相粘土固结行为的影响
DOI：
10.1520/gtj11079j
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
T. Feng
中科院分区：
文献类型：
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作者：
T. Feng
天然软粘土是土木工程中经常遇到的一种粘土。这种土壤具有很大的压缩潜力，需要通过有效的地基加固技术来缓解。目前对掺加少量水泥以改善软土固结特性的认识还很有限。本文研究了原状湖相软粘土经小掺量水泥处理后的固结特性。根据软粘土和水泥混合物的pH值，选择3%和6%的小水泥含量来制备软粘土-水泥固结计试样。固结仪试验结果表明，先期固结压力随水泥掺量的增加而减小或增大。二次压缩指数降低，二次压缩指数与压缩指数的比值也降低，表明粒度特征发生了变化。当固结压力接近有效上覆压力时，固结系数减小，当固结压力高于先期固结压力时，固结系数大致相等或略有增加。这些数据表明，在小水泥含量的水泥处理天然软粘土可以有效地减少初级和次级沉降。
Natural soft clays are frequently encountered in civil engineering projects. Such soils possess large compression potential that needs to be alleviated by means of effective ground improvement techniques. Current knowledge on mixing soft clay with small cement content to improve its consolidation properties is limited. This study looks into the consolidation behavior of undisturbed lacustrine soft clay treated with small cement contents. Based on the pH values of soft clay and cement mixtures, small cement contents of 3 and 6% were chosen to prepare soft clay-cement oedometer specimens. The oedometer test results show that the preconsolidation pressure may be decreased or increased, depending on the cement content added. The secondary compression index is reduced and the ratio of secondary compression index to compression index is also reduced, indicating a change in grain size characteristics. The coefficient of consolidation is reduced for consolidation pressures near the effective overburden pressure and is about equal or slightly increased for consolidation pressures higher than the preconsolidation pressure. These data indicate that treating natural soft clay with cement at small cement contents can be effective in reducing both primary and secondary settlements.