堆载作用下软土地基瞬时变形研究

发布时间：2018-04-23 20:01

本文选题：堆载 + 瞬时变形　；参考：《浙江大学》2013年硕士论文

【摘要】：堆载预压法是处理软土地基的有效方法,已广泛运用在堆场、道路、港口、大坝和机场的建设中。基于工法的特点,软土在堆载作用下将产生较大的竖向沉降和深层土体侧向位移。其中,固结变形较大,但持续时间长、变形发展相对缓慢,易于控制；但瞬时变形持续时间短、变形发展迅速,一旦失控就会引发工程事故,故有必要对其进行更深入的研究。首先,回顾了瞬时变形的研究现状,包括弹性方法、数值分析方法和经验预测方法等。然后,根据Bolton等学者提出的“可变强度”概念,结合土塑性原理和三轴试验所得应力-应变关系等,推导了适用于堆载作用下土体瞬时变形计算的MSD方法。最后,应用某一实际堆载工程进行验证和比较分析,比较结果显示,本文提出的MSD方法是有效可信的,较其他方法更加简便、准确。
[Abstract]:The surcharge preloading method is an effective method for the treatment of soft soil foundation, and has been widely used in the construction of yard, road, port, dam and airport. Based on the characteristics of the engineering method, the vertical settlement and lateral displacement of the deep soil will be produced under the surcharge of soft soil. Among them, the consolidation deformation is large, but the duration is long, the deformation development is relatively slow, easy to control, but the instantaneous deformation duration is short, the deformation development is rapid, once out of control will cause the engineering accident, therefore, it is necessary to carry on the deeper research to it. Firstly, the research status of instantaneous deformation is reviewed, including elastic method, numerical analysis method and empirical prediction method. Then, according to the concept of "variable strength" put forward by Bolton and combining with the principle of soil plasticity and the stress-strain relationship obtained from triaxial tests, a MSD method for calculating the instantaneous deformation of soil under surcharge is derived. Finally, a practical surcharge engineering is used to verify and compare the results. The comparison results show that the proposed MSD method is effective and reliable, and is simpler and more accurate than other methods.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU447

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