吹填淤泥自重固结性状研究  

Study on Self-Weight Consolidation Behaviors of Dredged Fill

作　　者：张明[1,2] 刘国楠[2] 赵有明[2] 

机构地区：[1]河南工程学院土木工程学院,河南郑州451191 [2]中国铁道科学研究院,北京100081

出　　处：《中国铁道科学》2013年第5期15-20,共6页China Railway Science

基　　金：高校博士基金资助项目(D2012007);河南省教育厅自然科学基金资助项目(2012B560004)

摘　　要：结合围海造陆软基处理工程项目,基于以界限孔隙比作为吹填淤泥落淤过程沉积与自重固结的分界点、考虑落淤后发生以自重固结为主的变形,推导吹填淤泥一维自重固结方程并编制有限差分法求解程序,进行初始压缩性、初始渗透性及初始体积分数对吹填淤泥自重固结性状的影响分析,结果表明:初始压缩性和初始渗透性的增加,明显加快颗粒体自重有效应力、体积分数的增长及孔隙比的减小,加速表面沉降及沉降速率的发展;吹填淤泥自身强度的增长、压密程度、孔隙特征和表面沉降对初始体积分数的变化极其敏感,初始体积分数的增加会减缓颗粒体自重有效应力、体积分数和孔隙比的变化,初始体积分数的减小会加速表面沉降与沉降速率的发展。Self-weight consolidation deformation is considered as the main effect after self-weight deposi- tion of dredged fill when the boundary void ratio is regarded as the dividing point between deposition and self-weight consolidation. On the basis of the above assuming condition, one dimension self-weight consol- idation equation of dredged fill and the finite difference method solution computing program are established in published literature. Based on reclamation land soft clay foundation improvement project, some signifi- cant influences of initial compressibility, initial permeability and initial solid volume fraction on self-weight consolidation behaviors of dredged fill are analyzed by one dimension self-weight consolidation governing e- quation and the finite difference method solution computing program. The results are shown as follows： with the increase of initial compressibility and initial permeability, the increase velocity of solid self-weight effective stress and solid volume fraction as well as the decrease velocity of void ratio are accelerated signif- icantly, and the development velocity of surface settlement and settlement rate is also accelerated. The in- crease of the strength, compaction degree, pore characteristics and surface settlement of the dredged fill it- self are extremely sensitive to the variation of initial solid volume fraction. With the increase of initial solid volume fraction, the variation velocity of solid self-weight effective stress, volume fraction and void ratio is slowed. With the decrease of initial solid volume fraction, the development velocity of surface settlement and settlement rate is accelerated.

关 键 词：围海造陆 软基处理 吹填淤泥 落淤过程 自重固结 压缩性 渗透性 体积分数 

分 类 号：TU447[建筑科学—岩土工程]