Research on the Relationship between SPT and the Ultimate Vertical Bearing Capacity of Jacked Pile in Shenyang District

Though the wide applications of jacked pile in engineering in Shenyang district, the problem is also exist in engineering for the capacity of the jacked pile is hard to account. The relationship between the standard penetration test and the ultimate vertical bearing capacity of jacked pile is established in this paper; also an empirical formula is put forward for calculating the ultimate vertical bearing capacity of the jacked pile in this district with blow count of standard penetration test (SPT). The engineering examples indicated that the empirical formula is feasible because the calculating bearing capacity of the silent pipe pile is coincided with the static load tests. The calculated results satisfy the engineering requirement andt can be concluded that the method is also convenient to choose the diameter and length of the pile during the initial stage of design.

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Vertical bearing capacity factors for circular and strip footings on Mohr–Coulomb soil

Canadian Geotechnical Journal ◽

10.1139/t93-099 ◽

1993 ◽

Vol 30 (6) ◽

pp. 1024-1033 ◽

Cited By ~ 187

Author(s):

M.D. Bolton ◽

C.K. Lau

Keyword(s):

Bearing Capacity ◽

Plane Strain ◽

Method Of Characteristics ◽

Soil Parameters ◽

Shape Factors ◽

Method Of Solution ◽

Vertical Bearing ◽

Strip Footings ◽

Vertical Bearing Capacity ◽

The Relationship

The method of characteristics is used to establish consistent factors for the vertical bearing capacity of circular and strip footings on soil which satisfies a linear [Formula: see text] Mohr–Coulomb strength criterion. This method of solution avoids the assumption of arbitrary slip surfaces, and produces zones within which equilibrium and plastic yield are simultaneously satisfied for given boundary stresses. Although similar solutions have previously been published for circular footings, their application has been hindered by errors and confusions over terminology. These are resolved, and the method of solution is explained. It is confirmed that Terzaghi's approach to the superposition of bearing terms containing Nq, Nγ, and Nc is both safe and sufficiently accurate for circular footings, as for strip footings. The values to be adopted are tabulated as functions of [Formula: see text]. Differences between the factors applicable to circular and strip footings far exceed the allowances of the empirical shape factors in common use. Some new shape factors are suggested that better represent the relationship between the limiting equilibrium of circular and strip foundations. Some current shape factors attempt to allow simultaneously for the differences in equilibrium solutions and the differences in axisymmetric (triaxial) and plane strain soil parameters. This cannot succeed, since the relationship between strength parameters depends strongly on relative density. The new bearing factors facilitate a more rational approach in which soil parameters appropriate to the geometry can first be determined and then used to find appropriate bearing capacity factors. Key words : bearing capacity, axisymmetry, method of characteristics, footings, plane strain.

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Reliability Analysis of Vertical Bearing Capacity of Pile Based on Static Load Tests

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.5745 ◽

2011 ◽

Vol 243-249 ◽

pp. 5745-5750

Author(s):

Shi Qing Liu ◽

Jun Jie Zheng ◽

Zhi Jun Xu ◽

Xiao Ya Bian

Keyword(s):

Bearing Capacity ◽

Static Load ◽

Design Parameters ◽

Building Foundation ◽

Range Theory ◽

Load Tests ◽

Sample Range ◽

Single Piles ◽

Vertical Bearing ◽

Vertical Bearing Capacity

Based on the sample range theory in Mathematical Statistics, the general standard variance of vertical capacity of single piles is evaluated according to the data from static load tests, and a method is presented to evaluate the reliability of vertical bearing capacity of pile, of which distribution obeys normal distribution. Finally, results from the case study indicate that it is effective to evaluate the reliability using the method presented in this paper, and the number of tested piles specified in Technical Code for Testing of Building Foundation piles and determining sample range can be interpreted reasonably in theory. Meanwhile, it can give good references to designers to determine the design parameters according to testing piles.

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