Preliminary discussion of additional settlement due to static driving pile using anchored piles;

Based on a great number of laboratory tests on soils and loading tests on cast-in-place piles in the loess region,the rules of the shear strength decreasing with the increasing of moisture content of the loess,the development and variation of skin resistance and the additional settlement deformation of piles with saturation of unsaturated loess were found.

Formula for calculating additional settlement is derived based on the features of soil deformation surrounding the piles when anchor rod static pressure piles are constructed and analyses on the causes of additional settlement occurred to the building.

Incorporated with test of horizontal displacement and subsequent settlement outside strengthening area in actual project that has been set stress release ditch,it is concluded that the influenced area of horizontal displacement and subsequent settlement extents to more than 27.

Moreover,it is necessary to emphasize the subsequent settlement caused by construction of static bolt-pressing piles.

Based on the Stokes formula and Lambert-Beer Law, a series of recurrence formulae were advanced to calculate particle size distribution from the data obtained by disc centrifuge photosedimentation, with the effect of extinction efficiency of particles and the radial dilution during sedimentation considered.