吹填淤泥土的固结特性研究  

Study on consolidation characteristics of dredged fill

作　　者：张明[1] 杨永生[2] 

机构地区：[1]河南工程学院,郑州451191 [2]三门峡职业技术学院,河南三门峡472000

出　　处：《工程勘察》2011年第9期19-24,共6页Geotechnical Investigation & Surveying

摘　　要：介绍了大型围海吹填造陆工程中,采用堆载预压与真空堆载联合预压法加固处理吹填淤泥与原状淤泥的工程实例。对该工程B2场地吹填淤泥落淤与软基处理前后物理力学性质、吹填淤泥与原状淤泥的压缩变形、孔压与真空度测试结果进行分析。结果表明:吹填淤泥经晾晒与自重固结作用,物理性质得到大大改善,表层0～1m平均含水量与孔隙比明显小于下层土,且沿深度发生变化;吹填淤泥经预压法处理后,加固效果明显优于原状淤泥,除强度外,两者物理力学性质十分接近,土层压缩比高达33.2%,为相邻原状淤泥的1.6～1.8倍;真空预压荷载下吹填淤泥孔压消散速率慢于原状淤泥,真空度沿淤泥层传递效果较好,加固效果十分明显。An engineering example is introduced,which applies surcharge preloading and vacuum preloading to treat dredged fill and marine original silt in large land reclamation projects.The physical and mechanical properties of dredged fill during self-weight deposition and soft clay foundation improvement,the compression deformation,pore water pressure and vacuum degree of dredged fill and marine original silt are analyzed in B2 site.The results are as follow： a significant improvement of the physical properties are obtained,and the average water content and void ratio of dredged fill have a significant variation along the depth,which of surface 0~1 m is significantly smaller than subsoil.After ground reinforcement,the reinforcement effect of dredged fill are prior to underlying original silt,and all kinds of physical and mechanical properties of dredged fill are close to underlying original silt except for the shear strength.The greatest compression ratio of dredged fill is 33.2%,and it is 1.6~1.8 times as the neighboring original silt.The dissipation velocity of pore water pressure for dredged fill is slower than original slit under vacuum preloading,and it shows a significant transmission effects for vacuum degree and reinforcing effect.

关 键 词：吹填淤泥 固结 吹填造陆 压缩比 孔隙水压力 

分 类 号：TU447[建筑科学—岩土工程]