无机结合料加固吹填海砂土的三轴试验研究

Triaxial Test on Dredger Fill Sand Stabilized with Inorganic Binder

吹填海砂土黏聚力小,工程性能较差,容易受到雨水冲刷而导致路基破坏,因此用作路基填料时需要采用无机结合料加固。对掺加石灰和水泥加固的海砂土试样,通过三轴试验来研究它们的强度特性和应力-应变规律。试验结果表明:干密度、养护龄期、无机结合料掺量是固化海砂土强度影响的正相关因子;延迟击实时间和含水率为负相关因子;对于含盐量,3%为分界,含盐量小于3%时,强度随含盐量增加而增加;大于3%时,强度随含盐量增加而减小。

Dredger fill sand has small cohesive force,inadequate engineering performance,and is vulnerable to rainfall erosion which leads to subgrade destruction.Used as roadbed filling material,dredger fill sand should be reinforced by inorganic binder.Triaxial tests were carried out on dredger fill sand specimens stabilized with lime and cement to research their strength properties and stress-strain regularity.Test results show that dry density,curing period,and inorganic binder content are positive correlated factors affecting the strength of dredger fill sand;while the delayed time of compaction and the water content are negatively correlated factors.As for salinity,with 3％ as a dividing line,when less than 3％,the strength is increased with the increase of salt content; when larger than 3％,the strength decreases with the increase of salt content.