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。

 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.