重力式码头抛石基床应力分析

发布时间：2018-06-19 19:55

本文选题：厚抛石基床 + 地基应力　；参考：《天津大学》2007年硕士论文

【摘要】： 在现行规范中,重力式码头抛石基床应力的计算假定基床是刚性的,不考虑基床前、后方的土压力,只考虑基床自重和基顶应力向下的传播。随着大型重力式码头抛石基床深度的不断加深,基床前、后方的土压力也在不断的加大,现行规范这种计算方法与实际情况就可能存在较大的差异。本文通过系统的计算、研究,分析厚抛石基床前后方土压力对基床内应力分布的影响,根据有限元软件PLAXIS计算出的应力分布规律,提出了更合理的改进计算方法。首先,仍采用现行规范关于基床刚性的假设,并考虑基床前、后方的土压力,提出一个新的计算公式,通过工程实例的理论计算比较,可以发现,考虑、不考虑基床前、后方的土压力对基床应力分布的影响是很大的,说明在基床较厚的情况下,不能忽略基床前、后方的土压力。其次,利用大型土工有限元软件PLAXIS对工程实例进行数值模拟分析,总结基床内部的应力分布规律,并通过模型参数的调整,讨论基床内部应力分布规律的影响因素。最后,根据有限元模拟出的结果基床应力分布规律,并考虑基床前、后方的土压力,理论推导出一种采用三个控制点的改进计算方法,并通过工程实例的计算,证明这种改进计算方法更能准确的反映基床应力的实际分布规律。本文为完善重力式码头厚抛石基床的设计理论进行了深入的研究和大量的计算,并通过工程实例的计算比较,说明本文第五章提出的这套改进计算理论是具有一定的实用价值的。
[Abstract]:In the current code, the calculation of the stress of the parabolic bed of gravity wharf assumes that the base bed is rigid and the earth pressure in front and rear of the bed is not considered, but only the gravity of the base bed and the propagation of the stress on the top of the foundation are taken into account. With the deepening of the depth of the rubble bed in the large gravity wharf, the earth pressure in the front of the foundation bed and behind it is also increasing, so there may be a great difference between the present calculation method and the actual situation. In this paper, through systematic calculation and research, the influence of earth pressure on the stress distribution in the foundation bed is analyzed. According to the stress distribution law calculated by the finite element software PLAXIS, a more reasonable and improved calculation method is put forward. First of all, we still adopt the assumption of the rigidity of the foundation bed in the current code, and consider the earth pressure in front and rear of the foundation bed, and put forward a new calculation formula. Through the theoretical calculation and comparison of the engineering examples, we can find, consider, do not consider the front of the foundation bed. The influence of the earth pressure on the stress distribution of the base bed is very great, which indicates that the earth pressure in the front and back of the bed cannot be ignored when the bed is thicker. Secondly, the numerical simulation and analysis of engineering examples are carried out by using the large-scale geotechnical finite element software PLAXIS, and the stress distribution law in the base bed is summarized, and the influencing factors of the stress distribution law in the base bed are discussed by adjusting the model parameters. Finally, according to the result of finite element simulation and considering the earth pressure in front and rear of the bed, an improved calculation method using three control points is deduced theoretically, and the calculation is carried out through an engineering example. It is proved that the improved method can more accurately reflect the actual distribution of the stress in the base bed. In this paper, in order to perfect the design theory of gravity wharf's thick parabolic bed, the author has carried on the thorough research and the massive calculation, and through the engineering example computation comparison, It shows that the improved calculation theory proposed in the fifth chapter of this paper has certain practical value.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2007
【分类号】：U656.1

【参考文献】