Stresses and displacements in a circular ring loaded by symmetrically spaced radial forces

This paper presents the study of a plane elasticity problem for a concentric circular ring loaded by a system of equal radial forces equally spaced around its outer ring boundary. The problem is solved by the Kolosov–Muskhelishvili complex variables method. Explicit formulas are derived for calculating components of the stress tensor and of the displacement vector. Numerical values for circumferential stress and radial displacement are given for various ratios of inner and outer ring radii and various numbers of forces.     

Use of cast-in-place piles in the foundation of a tower structure under complex soil conditions

Experience with the design and construction of a 70-meter metallic tower at a site with soils classed as type II in terms of proneness to slump-type settlement and foundations formed from BSS cast-in-place piles (in dry stable soils without stabilization of the walls of the holes) with holes widened at their bases is brought to light. __________ Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 5, pp. 26–29, September–October, 2006.     

圆形结构下筏式基础变形反力分布规律试验研究

通过大型室内模型试验,指出圆形结构的荷载呈放射状传递到地基,当荷载与基础的相对挠曲呈线性关系时,柔性基础的基底反力、基础变形在结构外的2.5倍基础厚度范围内都是均匀分布的。柔性基础在破坏前的相对挠曲是逐渐增加的,而刚性基础在破坏时基础的相对挠曲突然增大。柔性基础的基底反力始终是中心点反力最大;刚性基础的中心点处基底反力小于周边基础反力。研究表明,基础变形、反力分布与基础和上部结构的刚度及形状有关,基础刚度越大,其调整基础变形、反力分布的能力越大。     

竖向荷载下膨胀土桩基承载室内模型试验

利用自主研发的多向桩基加载系统,开展了室内模型试验,研究了膨胀土中桩基分别在最优含水率和饱和含水率条件下的下压和上拔荷载桩基的承载特性。试验结果表明:膨胀土含水率的变化,对抗压桩的极限承载力影响更为明显,对抗拔桩的极限位移影响更为明显。随着含水率的增加,尽管抗压桩和上拔桩的极限侧摩阻力均减小,且减小程度接近,但上拔荷载作用下极限侧摩阻力明显低于下压荷载的极限侧摩阻力。不同含水率条件下,抗压试验桩身极限侧摩阻力呈抛物线形分布,而上拔试验桩身极限侧摩阻力呈线性分布,含水率的增加使抗压桩和上拔桩的极限承载力显著减小,且抗压桩减小幅度更大,但抗压桩的极限承载力始终大于上拔桩的极限承载力。     

路基下载体桩及载体桩复合地基的受力研究分析

本文通过单桩和载体桩载荷试验分析研究了载体桩受力与普通桩基受力的区别,并结合载体桩复合地基的载荷试验,分析了载体桩复合地基在受力情况下载体桩受力与载体桩桩基受力的区别,研究了载体桩复合地基的受力机理。通过监测载体桩复合地基载荷试验和路基填土荷载下载体桩复合地基桩顶的桩土应力比和桩身钢筋受力随荷载的变化,分析了载荷板试验情况下及实际填土工况下复合地基受力的不同之处,以便选择更加合理的检测方法检测路基下复合地基的承载力。