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Peng L.-C.,Zhuhai Center for Supervision and Inspection on Quality of Infrastructure Engineering | Lin Y.-X.,Zhuhai Center for Supervision and Inspection on Quality of Infrastructure Engineering | Huang L.-J.,Zhuhai Center for Supervision and Inspection on Quality of Infrastructure Engineering
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

The prestressed high strength concrete pile (PHC pile) is suitable for deep soft clay soil. Using the PHC piles for foundation pile has significant advantages of technical and economic indexes. Because of quality of the PHC piles, geological conditions, design, construction and management problems, some quality problems of foundation piles may be aroused, i.e., rupture and inclination of pile shaft, low bearing capacity, large settlement, bad welding seam of the pile lapping. Based on the geological characteristics and construction of PHC piles, the causes of pile quality accident are analyzed from the results of high strain tests, low strain tests, static loading tests and video monitoring through the holes combined with engineering examples. The preventive and treatment measures are provided. Source


Jiang M.-J.,Tongji University | Peng L.-C.,Zhuhai Center for Supervision and Inspection on Quality of Infrastructure Engineering | Zhu H.-H.,Tongji University | Lin Y.-X.,Zhuhai Center for Supervision and Inspection on Quality of Infrastructure Engineering | Huang L.-J.,Zhuhai Center for Supervision and Inspection on Quality of Infrastructure Engineering
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

The investigation on shear band of natural clay has always been main topic in geomechanics. In this paper, quantitative analysis was made on microstructure of the soil inside and outside shear band in Zhuhai clay by means of scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP). The results indicate that the stress-strain curves of Zhuhai clay show obviously strain-softening behavior at low confining pressures. In comparison with microstructural parameters of the intact samples, the change of microstructural papameters is maximal inside the shear band, then on the edge of shear band, and the outside is minimal. The orientation of particles on the edge of the shear band is parallel to the direction of the shear band, while the particles are generally random distributed inside the shear band, as a result of a significant breakage of the aggregates and the large particles. Distribution of particles is slightly affected in the area outside shear band by the shearing. In addition, the entrance pore size distribution of marine clay in Zhuhai demonstrates a continuous unimodal distribution, and its peak value and its corresponding pore radius decrease along the direction of outside, on the edge and inside shear band. Finally, the orientation of shear band predicted by the classical Mohr-Coulomb theory is generally consistent with the measured data, whereas the predictions by Roscoe theory and Arthur formula is significantly smaller than the experimental data. Source

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