Mechanical Behaviors of Rigid Pile Composite Foundation in Yellow River Alluvial Plain Subjected to Soil Water Content Variations

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Yunlong Liu, Yanyan Xia, Jingwei Zhang, Bantayehu Uba Uge
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引用次数: 0

Abstract

Rigid pile composite foundation (RPCF) has been widely used in Yellow River Alluvial Plain (YRAP) due to remarkable reinforcement and economical effects. However, current design of RPCF in this area are typically based on saturated soil mechanic principles assuming drained condition, despite the fact that the soil is typically in unsaturated condition. Due to long time water scouring, the silt in YRAP generally exhibits high particle sphericity and poor particle gradation. Even after standard compaction, it is still in a relatively loose state with developed capillary pores. Water content increment induced by infiltration can lead to considerable soil mechanical properties degradations due to matric suction reduction associated with soil micro-structure rearrangement. Consequently, the RPCF will suffer serious bearing characteristic deteriorations, exhibiting additional settlement. In this study, extending unsaturated soil mechanics, initially the influences of matric suction on mechanical properties of YRAP silt were demonstrated. Then total RPCF settlement was calculated as the sum of the compression deformation of the soil between piles in the reinforcement zone and the underlying soil stratum. The former one was estimated through the modified load transfer curve method considering the pile-soil interface behaviors deteriorations with matric suction reduction, while the later one was estimated through the traditional stress diffusion method. The feasibility of the proposed method was validated through a model RPCF test subjected to ground water level fluctuations. Good comparisons on RPCF mechanical behaviors indicate the proposed method can be a valuable tool in the design of RPCF in YRAP under extreme weather conditions.

黄河冲积平原刚性桩复合地基在土壤含水量变化下的力学行为
刚性桩复合地基以其显著的加固效果和经济效益在黄河冲积平原得到了广泛的应用。然而,目前该地区的RPCF设计通常基于假定排水条件下的饱和土力学原理,而实际上该地区的土壤通常处于非饱和状态。由于长时间的水冲刷,YRAP泥沙普遍表现为颗粒球形度高,颗粒级配性差。即使经过标准压实,其仍处于相对疏松状态,毛细孔发育。由于基质吸力的减少和土壤微观结构的重排,入渗引起的含水量增加会导致土壤力学性能的显著退化。因此,RPCF将遭受严重的承载特性恶化,表现出额外的沉降。本研究扩展非饱和土力学,初步论证了基质吸力对YRAP粉土力学特性的影响。然后计算总沉降量为加固区桩间土与下卧土层的压缩变形之和。前者通过考虑桩土界面性能随基质吸力减小而恶化的修正荷载传递曲线法估计,后者通过传统的应力扩散法估计。通过地下水位波动条件下的模型RPCF试验,验证了该方法的可行性。通过对RPCF力学性能的比较表明,该方法可为极端天气条件下YRAP RPCF的设计提供有价值的工具。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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