挡土墙侧向位移修复结构设计及性能试验研究
发布时间：2018-12-17 15:23
【摘要】：挡土墙结构目前已在公路、铁路、港口工程、建筑工程等领域中得到了较为广泛的应用,然而在诸多挡土墙结构物中,由于受到墙背土压力、外界荷载等因素的影响,有部分挡土墙结构物会发生一定程度的侧向位移。对此,为降低挡土墙侧向位移对工程安全和环境产生的不利影响,论文以工程实际为依托,综合利用室内试验和有限元仿真相结合的方法对挡土墙侧向位移修复结构进行研究,主要得到以下结论:(1)基于挡土墙侧向位移的影响因素及其组成情况,设计了一种挡土墙侧向位移修复结构,该结构不仅可以有效修复原有挡土墙的侧向位移,还能增强挡土墙的稳定性;(2)结合工程实际情况和所设计结构的受力特性,设计了相应的室内试验模型,研究确定了模型的测试元件、土性参数、试验过程以及试验内容;(3)利用所设计的室内试验模型进行侧向位移修复试验,通过试验可以看出,所设计模型能够实现对挡土墙侧向位移的修复,而且随着挡土墙侧向位移修复量的逐渐增加,顶压力、挡土墙应力、墙背土压力都呈现逐渐增大的趋势;(4)综合考虑所设计结构和室内模型成果,建立了仿真分析模型,从仿真分析结果来看:顶压方向与水平夹角为30o、顶压位置距墙顶15cm、取土孔直径0.08m、取土孔距墙0.3m时,挡土墙侧向位移修复过程中的顶压力、挡土墙应力、墙后土压力最小;当墙背填土为砂性土时,顶压力、挡土墙应力、墙后土压力最大;在顶压方向、顶压位置、墙后取土孔大小、墙后取土孔位置、墙后土体土性参数五种因素中,墙后取土孔大小和墙后土体土性参数对挡土墙结构物的力学性能影响较大。
[Abstract]:Retaining wall structure has been widely used in highway, railway, port engineering, construction engineering and so on. However, in many retaining wall structures, due to the influence of earth pressure on the back of the wall, external load and other factors, the retaining wall structure has been widely used in the field of highway, railway, port engineering, construction engineering and so on. Some retaining wall structures will have a certain degree of lateral displacement. In order to reduce the adverse effect of lateral displacement of retaining wall on engineering safety and environment, the paper studies the lateral displacement repair structure of retaining wall based on the engineering practice and the combination of indoor test and finite element simulation. The main conclusions are as follows: (1) based on the influencing factors of lateral displacement of retaining wall and its composition, a retaining wall lateral displacement repair structure is designed, which can not only effectively repair the lateral displacement of the original retaining wall, It can also enhance the stability of retaining wall. (2) according to the actual situation of the project and the mechanical characteristics of the designed structure, the corresponding indoor test model is designed, and the test elements, soil property parameters, test process and test contents of the model are studied and determined. (3) using the designed indoor test model to carry out lateral displacement repair test, it can be seen that the designed model can be used to repair the lateral displacement of retaining wall, and with the increase of the amount of lateral displacement of retaining wall, The top pressure, the stress of retaining wall and the earth pressure on the back of the wall are gradually increasing. (4) considering the designed structure and indoor model results, the simulation analysis model is established. The simulation results show that the angle between the top pressure direction and the horizontal angle is 30o. the top pressure position is 15cm from the top of the wall, and the diameter of the earth sampling hole is 0.08m. When the hole is 0.3m away from the wall, the top pressure of retaining wall, the stress of retaining wall, and the earth pressure behind the wall are the least in the course of lateral displacement repair. When the backfill of the wall is sandy, the top pressure, the stress of the retaining wall and the earth pressure behind the wall are the largest. In the top pressure direction, the top pressure position, the size of the retaining hole behind the wall, the location of the soil hole behind the wall, and the soil property parameters behind the wall, the size of the retaining wall hole and the soil property parameter behind the wall have a great influence on the mechanical properties of the retaining wall structure.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU476.4
本文编号：2384385
[Abstract]:Retaining wall structure has been widely used in highway, railway, port engineering, construction engineering and so on. However, in many retaining wall structures, due to the influence of earth pressure on the back of the wall, external load and other factors, the retaining wall structure has been widely used in the field of highway, railway, port engineering, construction engineering and so on. Some retaining wall structures will have a certain degree of lateral displacement. In order to reduce the adverse effect of lateral displacement of retaining wall on engineering safety and environment, the paper studies the lateral displacement repair structure of retaining wall based on the engineering practice and the combination of indoor test and finite element simulation. The main conclusions are as follows: (1) based on the influencing factors of lateral displacement of retaining wall and its composition, a retaining wall lateral displacement repair structure is designed, which can not only effectively repair the lateral displacement of the original retaining wall, It can also enhance the stability of retaining wall. (2) according to the actual situation of the project and the mechanical characteristics of the designed structure, the corresponding indoor test model is designed, and the test elements, soil property parameters, test process and test contents of the model are studied and determined. (3) using the designed indoor test model to carry out lateral displacement repair test, it can be seen that the designed model can be used to repair the lateral displacement of retaining wall, and with the increase of the amount of lateral displacement of retaining wall, The top pressure, the stress of retaining wall and the earth pressure on the back of the wall are gradually increasing. (4) considering the designed structure and indoor model results, the simulation analysis model is established. The simulation results show that the angle between the top pressure direction and the horizontal angle is 30o. the top pressure position is 15cm from the top of the wall, and the diameter of the earth sampling hole is 0.08m. When the hole is 0.3m away from the wall, the top pressure of retaining wall, the stress of retaining wall, and the earth pressure behind the wall are the least in the course of lateral displacement repair. When the backfill of the wall is sandy, the top pressure, the stress of the retaining wall and the earth pressure behind the wall are the largest. In the top pressure direction, the top pressure position, the size of the retaining hole behind the wall, the location of the soil hole behind the wall, and the soil property parameters behind the wall, the size of the retaining wall hole and the soil property parameter behind the wall have a great influence on the mechanical properties of the retaining wall structure.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU476.4
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