论文部分内容阅读
首先对快速和慢速灌注混凝土的情况及其与承载力关系的力学机制进行分析,认为在其他条件相同情况下,快速灌注混凝土情况对应于桩基础承载力的上界,实际施工的混凝土灌注速度介于研究中定义的快与慢之间,所以其承载力也介于这两者之间。其次,对于快速灌注混凝土的情况,桩孔壁土体受处于流态的混凝土法向分布压力作用,其凝固并达到设计强度后的承载性能与法向分布压力大小直接相关,并以此定义桩土作用的力学模型位移和应力边界条件和求解方法。最后,应用变分理论求解桩土作用在桩周土体中形成的应力场和界面的法向压力,求解桩土作用界面上的极限摩阻力,从而求得冲钻孔灌注桩的理论极限承载力和桩身轴力,并结合现有超长灌注桩的桩身轴力实测资料,验证本文分析方法和求解结果的合理性。
First of all, the fast and slow perfusion of concrete and its relationship with the bearing capacity of the mechanical mechanism analysis, that other conditions under the same circumstances, the rapid infusion of concrete corresponds to the upper bearing capacity of the pile foundation, the actual construction of concrete pouring speed Between the fast and slow defined in the study, its bearing capacity is also in between. Secondly, in the case of rapid pouring of concrete, the pile-hole wall soil is affected by the normal distributed pressure of the concrete in the fluid state, and the bearing capacity after solidification and design strength is directly related to the normal distribution pressure. Soil mechanics model displacement and stress boundary conditions and solution method. Finally, the variational theory is applied to solve the stress field and interface normal pressure induced by the action of pile-soil in the soil around the pile, and the ultimate frictional resistance at the interface between the pile and soil is solved. The theoretical ultimate load of the percussion- Force and pile axial force, combined with the actual measured data of the existing super-long bored piles, the rationality of the analysis method and the solution of the paper are verified.