分析了不同类型覆盖层的特点及导截流存在的问题，通过理论分析和模型试验，对深厚覆盖层条件下导截流工程存在的覆盖层稳定特性、覆盖层防护、截流块体稳定计算、人工块体稳定性问题以及淤积型覆盖层河床预防戗堤坍塌措施等关键技术问题进行了研究，完善了块体稳定计算实用计算公式，拟合了六面体钢筋笼的稳定计算经验公式，首次提出相同重量的四面体钢筋笼的止动稳定性明显高于正六面体，而起动稳定性相差不大。

By theoretical analysis and model experiment, the features of different kinds of covering layers and the problems existing in the construction of diversion and river closure are analyzed. Critical technical issues under deep  thickness covering layer condition such as the covering layer stability , the covering layer protection, the stability calculation of closure block, the artificial block stability and the preventive measures against embankment collapsing in alluvial riverbed are studied also. In addition, the practical computation formula for block stability is improved, and the empirical equations for the stability calculation of hexahedron steel reinforcement cage are deduced. It is the first to put forward that the stop- move stability of tetrahedron steel reinforcement cage is obviously better than that of hexahedron steel reinforcement cage, yet their start- move stability differs slightly.