China JIKAN Institute of Engineering Investigation and Design

Fengcheng, China

China JIKAN Institute of Engineering Investigation and Design

Fengcheng, China
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Liu Z.-H.,China JIKAN Institute of Engineering Investigation and Design | Zheng J.-G.,China JIKAN Institute of Engineering Investigation and Design | Zhang J.-W.,China JIKAN Institute of Engineering Investigation and Design | Qi C.-J.,China JIKAN Institute of Engineering Investigation and Design
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

With regard to the situation that the high-speed railway has requirements of strict post-construction settlement and the researches on the additional settlement of pile foundation caused by soils immersion are inadequate in collapsible loess area. Based on the field results of large pile immersion tests, the mechanism of the additional settlement of piles caused by soils immersion is studied, and a model is proposed. A method for calculating the post-construction settlement of pile foundation of bridges of high speed railway in collapsible loess area is put forward. The results show that the post-construction settlement of pile foundation of bridges should mainly consider the additional settlement caused by soil immersion in collapsible loess area, which mainly reflected by the compression of pile shaft and is much larger than the settlement only caused by structure load. The creep of concrete should not be neglected in the settlement calculation. The distribution of axial force of piles before soil immersion can be calculated using the load transfer theory, and that after soil immersion also can be obtained if assuming the pile side and pile end resistances develop synchronously. Thereafter, the elastic compression of pile shaft, creep deformation of concrete, and pile tip settlement, which contribute to the post-construction settlement, can be calculated separately.


Zhang W.,China JIKAN Institute of Engineering Investigation and Design | Liu Z.,China JIKAN Institute of Engineering Investigation and Design | Zheng J.,China JIKAN Institute of Engineering Investigation and Design | Zhang S.,China JIKAN Institute of Engineering Investigation and Design
Global View of Engineering Geology and the Environment - Proceedings of the International Symposium and 9th Asian Regional Conference of IAEG | Year: 2013

Type of collapsibility of site is an important content in evaluation of loess collapsibility, the results calculated according to indoor test is often contradict with field test results. In order to solve the contradiction, the paper analyzes the factors that brings about difference in indoor and field test results based on the in-situ immersion test results in loess site completed in recent years, makes a study of the influence of discontinuous distribution of collapsible loess on collapse settlement, and presents the improved empirical formula for collapse settlement calculation under overburden pressure. The results show that indoor collapsibility test succeeds but impairs the correlation between factors such as loess property, stratum configuration, stress history, buried depth and settlement by immersion, during collapse settlement calculation, the correction of these influential factors shall be taken into consideration; the standard used for judgment of Q2 loess as to whether it is collapsible may be properly heightened, in case of discontinuous distribution of collapsible loess, stress redistribution effect shall be taken into account. © 2013 Taylor & Francis Group, London.


Yu Y.-T.,China Jikan Institute of Engineering Investigation and Design | Zheng J.-G.,China Jikan Institute of Engineering Investigation and Design | Liu Z.-H.,China Jikan Institute of Engineering Investigation and Design
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

Based on direct shear tests on intact and remolded Angola Quelo/Muceque sand, the effects of structural characteristics, water content and dry density on the shear strength have been explored. The test results indicate that the structural characteristics have a relatively complex impact on the shear strength of the Quelo sand; and there are some significant differences in the shear strength parameters between intact and remolded samples. The water-weakening characteristics of the Quelo sand are remarkable; and the cohesion and the internal friction angle of intact and remolded samples tend to be approximately logarithmic attenuation with increasing the water content. The Quelo sand is well-graded and will achieve high shear strength after compaction, which is suitable to be used as backfill material. With increasing the dry density, the cohesion increases linearly and the internal friction angle can be divided into stabilizing section and increasing section, showing the characteristics of sub-functions.

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