滇池固化淤泥重塑土的重塑时机及强度恢复特性试验  

Suitable Compaction Moment and Strength Recovery Properties of Remodeled Stabilized Dredged Soil from Dianchi Lake

作　　者：桂跃[1] 余志华[1] 刘海明[1] 丁祖德[1] 张庆[1] 

机构地区：[1]昆明理工大学土木学院,昆明650051

出　　处：《吉林大学学报（地球科学版）》2014年第6期1928-1935,共8页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金青年基金项目(51108217);云南省科技厅应用基础研究计划项目(2011FZ047)

摘　　要：采用无侧限抗压强度试验和直剪试验,从单轴抗压强度、黏聚力、内摩擦角的角度探求了淤泥固化土重塑时导致的强度折减和重塑后土的强度恢复特性,并分析了重塑前养护龄期(T前)、重塑后养护龄期(T后)、水泥掺灰比(ac)的影响。试验结果表明,重塑时机的选择对淤泥固化土的强度折减程度有显著的影响:T前越长,破碎过程带来的强度折减越严重,且大致满足ac越大、强度折减越严重的规律。从强度恢复特性来看:小水泥掺灰比的固化淤泥土经过T后,其强度恢复较好;大掺灰比的重塑土其强度则较难恢复至固化土的水平,T前越长,强度恢复越不利。从而得出了大掺灰比固化土宜早重塑,小掺灰比的重塑时间可适当延长的规律。To determine the suitable compaction moment and strength recovery properties of remodeled stabilized dredged soil,the unconfined compression test and direct shear test were conducted. The mechanism of strength reduction and recovery were analyzed in term of cohesive strength and internal frictional angle of stabilized dredged soil and remodeled stabilized dredged soil.And three factors including the curing period before remolded,the curing period after remolded,cement content impact on the strength of stabilized dredged soil and remodeled stabilized dredged soil were explored. Test results show that the curing period before remolded causes a significant impact on the strength reduction of remodeled stabilized dredged material.The strength reduction ratio increased with the curing period before remolded increased.And the strength reduction ratio increased with the cementcontent increased too.After curing,the unconfined strength of remodeled stabilized dredged soil with small cement content recover well,however the large one was difficult to recover to close to the level of stabilized dredged soil.And the curing period extends are adverse to the strength recovery of remodeled stabilized dredged soil.To conclude,the stabilized dredged soil with small cement content may be remodeled sooner rather than later,however,the large one can be prolong remodeled time properly.

关 键 词：疏浚淤泥 固化 重塑时机 强度折减 强度恢复 

分 类 号：P642.1[天文地球—工程地质学] TU47[天文地球—地质矿产勘探]