According to the surrounding conditions of the foundation pit of the comprehensive building in Dongying people s hospital,high pressure grouting and underpinning reinforcement,pile-anchor support and composite soil nailing wall,three deformation control methods are used.

The article introduces the application of pile-anchor support system to the retaining of super-deep cut at the old clay area and concludes finally that this system is quite effective.

Currently used methods for designing anchored sheet pile wall for supporting excavation are analyzed in this paper.

The problems in the free and fixed earth support methods for thd design of the anchored sheet pile wall for excavation are briefly discussed.

Finite element method analysis of big and deep excavation engineering in pile and anchor supporting;

Research on the optimal design of anchored piles in row for excavation retainig system with GA;

Co-evolution optimization of anchored piles in row for deep foundation pit;

Time-variation analysis for the elastic coefficient of fulcrum in the calculation model of pile-anchor retaining structure(PARS);

Aiming at single fulcrum pile-anchor retaining structures,a new optimization method based on controlling the displacement of the top end of retaining piles during excavation has been proposed,and a related optimization model is established.