By analyzing the engineering geological problem of high building in karsts area,the destruction of karen foundation,karsts cave foundation and water gushing in pit foundation,solution schemes were putting forward: excavation with soil nailing,determinations the safe thickness of the roof of karsts cave foundation,early strength cement grouting gratin and water drainage.

Critical bottom thickness calculation of foundation pit in inrushing of soil and water;

Discussion on the Comparative Analysis of Calculation Methods to Anti-uprush of Foundation Pit;

The equilibrium between gravity of the upper impermeable stratum and water pressure is a common calculation method for anti-uprush of foundation pit.

With the scale of utilizing underground space growing,the specially deep cylindrical foundation pit becomes more and more to construct,the gushing of base plate with confined water is an important problem in excavation.

In this paper we consider that the obstruction of water layer becoms an equal and continous according to the real condition and the mechanism of the gushing,by means of the theory on machanics of material and structural machanics.

Under the soft soil geological condition,the problems of the settlement,destabilization,bottom pouring,super-settling and etc.