The construction technique of deep cut-off wall under the circumstance of poor quality of the dyke body and complicated geological structure of the dyke base is introduced.

This paper discusses the principle, design, and construction techniques of the applications of multiple deep-layer mixed seep-preventing wall of small diameter in water conservancy, and evaluates the effect of applications in the engineering examples.

It also discusses the characteristics of building seepage-proof plastic concrete walls, and hence helps to provide some successful experiences in building seepage-proof concrete walls under the condition of storage of reservoirs.

For the constructions of multiple deep-layer mixed seep-preventing wall in thick medium coarse sand bed,improving aiguille and using jet air from the middle aiguille can effectively improve the efficiency of the constructions and introduces workmanship.

Stress-strain monitoring of ultra-deep concrete cut-off wall of one reservoir;

The application of the deep stirring cement-soil cut-off wall to the Jingnan main embankment is described, involving principle, construction equipment, characteristics of technological process and quality control during construction of this technique ,and quality evaluation of cut-off wall ,etc.