Determination of characteristics of the proneness of loess soils to slump-type settlement

Various approaches to assessment of the relative proneness of soil to Slump-type settlement is examined. In deformation calculations, it is proposed to use the structural strength of the wetted soil in lieu of the pressure initiating slump-type settlement. It is emphasized that the relative proneness of soil to slump-type settlement should be determined under conditions whereby it is wetted with water or solutions corresponding in terms of temperature and chemical composition to the liquid circulating in utilities laid for the entity.     

Determination of the Resistance of Soils Prone to Slump-Type Settlement on the Lateral Surface of Cast-in-Place Piles and Slot Foundations

Results are cited for comparison of data derived from 30 static tests of cast-in-place and slot foundations at 11 sites, and for analysis of their resistance using data from the static probing of soils prone to slump-type settlement.     

On Control Tests of Piles under Static Loads and Interpretation of Their Results

The need for field control tests of piles during construction and reconstruction as an addition to effective regulatory documents on static pile testing is substantiated. Proposals are cited for the refinement and correspondence of positions of GOST 5686-94 and Construction Rule and Regulation 2.02.03-85 as applies to control tests of piles.     

Estimation of Pile Resistance in Soils Prone to Slump-Type Settlement from Results of Static Probing

Results are presented for static tests of precast piles 6–24 m long, and static probing of soils at experimental proving grounds. Negative-friction forces of soils prone to slump-type settlement and total pile resistance are estimated on the basis of data derived from static probing of the soils. The need for correction of individual positions taken in Body of Rules 50-102-2003 in conformity with Construction Rule and Regulation 2.02.03-85 is noted. __________ Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 5, pp. 28–30, September–October, 2005.     

Assessment of Negative Skin Friction in Bored Cast-In-Situ Piles According to Cone Penetration Test Data in Subsiding Soils

Soil Mechanics and Foundation Engineering - For bored cast-in-situ piles measuring up to 31 m in length, negative skin friction force calculations are compared according to static load test and...     

Refinement of Test Static-Load Test Procedure for Piles

Problems, which arise most frequently with the static testing of piles and which are insufficiently exposed in GOST 5686, are discussed. Proposals are given for refinement of active regulatory documents with consideration of experience accumulated with the testing of full-scale piles.     

On the Stress State of the Foundation Bed during Installation and Loading of a Pile Cast in a Hole Predrilled in Clayey Soils

Results are presented for field investigations of the stress state of the shaft of a cast-in-place pile and the surrounding soil mass in stages of the pile's installation, and its static loading in loess soils with the natural moisture content. Data indicating that the soil mass functions preferentially in an elastic state both during pile fabrication, and its vertical loading are obtained.