堤防加固工程中防渗墙的防渗效果及应用条件研究

对于采用防渗墙作为加固工程措施的长江重要堤防典型条件,用与设计规范相对应的理论对渗流场进行模拟,分析悬挂式防渗墙的防渗效果和变化规律,半封闭式防渗墙在各种因素作用下防渗效果的变化规律,对全封闭式防渗墙指出了可能影响防渗效果的因素;对不同结构形式防渗墙的设计与应用原则进行了讨论;首次提出了悬挂式防渗墙设计的防渗墙贯入比-比降曲线法,以及半封闭式防渗墙设计的防渗依托层渗透性-比降曲线法、厚度-比降曲线法和B值-比降曲线法。

Seepage control efficiency and application conditions of cut-off wall used for dyke reinforcement

 Under typical dyke conditions with cut off wall as reinforcement measure,the seepage field is simulated numerically by theory corresponding to design standard.The seepage control efficiency and its variation laws are analyzed for cut off wall of suspension type and semi closure type.The factors that might affect the efficiency of cut off wall of closure type are pointed out.The principles of design and application are discussed for cut off wall of different types.The penetration rate exit gradient curve method is presented to design the cut off wall of suspension type.The permeability exit gradient curve method,the thickness exit gradient curve method and the B value exit gradient curve method are presented to design the cut off wall of semi closure type.