The design,implementation and safe protectection for slot are introduced under the conditions of low constrution efficiency,electricity thunder tube defending the leakage,closing to well stake,well stake water blasting,the strong and tough rock cutting,and so on.

An engineering example of the excavation by controlled blasting for various small transect pile-wells in downtown districts is introduced.

The application of man-bored cast-in place pile in deep excavation support engineering;

Round-tapered lime-soil column and design calculation of its composite foundation;