多支点桩锚支护结构监测与GTS模拟分析

发布时间：2018-11-27 16:58

【摘要】：近年来,随着我国城市化的迅猛发展,各大城市相继做出超高层建筑的规划。向高空发展和地下空间的开发,是节约有限的土地资源,调整土地使用结构,人防和国防建设的必然选择。因此,带来了基坑工程的急剧增长。然而,在基坑工程中存在着：理论落后于实践,理论不能正确反映实际施工的问题。所以,在深基坑工程的施工过程中,进行全方位的安全监测、准确预报工程险情、将监测结果反馈到基坑设计方面,对深基坑的发展和研究有着深远的现实意义。针对以上问题,本文从以下五方面做出相应阐述： (1),对深基坑支护在设计理论和计算方法等领域的研究进行了回顾。 (2),对深基坑的监测系统中监测项目的确定、监测方法和监测仪器的选取、监测点位的设计和制作、监测预警值的应用等进行分析。对监测过程中出现的实际问题,提出预防和解决的方法。 (3),以桩锚支护体系的深基坑工程为实例。从土压力、桩身内力、桩体变形、锚杆预应力等四个方面进行监测。并分析出产生相应结果的原因。为检验理论设计计算方法的合理性和数值模拟计算的准确度提供了参照依据。 (4),利用有限元软件MIDAS/GTS进行了工程的数值模拟研究。着重对支护桩桩身变形随着时间(施工过程)的变化的分布规律进行了分析。 (5),得出预应力锚杆张拉时,限位板的槽深对张拉效果产生重大影响、经典土压力理论计算结果大于实际监测土压力的结论。为类似基坑支护工程的安全又经济的设计和施工提供了一定的依据。
[Abstract]:In recent years, with the rapid development of urbanization in China, major cities have made super-high-rise building planning. The development of high altitude and underground space is the inevitable choice to save limited land resources, adjust the structure of land use, civil air defense and national defense construction. Therefore, it brings the rapid growth of foundation pit engineering. However, in foundation pit engineering, the theory lags behind the practice, and the theory can not reflect the actual construction correctly. Therefore, in the construction process of deep foundation pit, it is of great practical significance for the development and research of deep foundation pit to carry out omni-directional safety monitoring, accurately predict the engineering danger, and feed back the monitoring results to the design of deep foundation pit. In view of the above problems, the following five aspects of the corresponding elaboration are made: (1) the deep foundation pit support in the design theory and calculation methods are reviewed. (2) the determination of monitoring items in the monitoring system of deep foundation pit, the selection of monitoring methods and instruments, the design and manufacture of monitoring points and the application of monitoring and warning values are analyzed. The methods of prevention and solution are put forward for the practical problems in the process of monitoring. (3) take the deep foundation pit engineering of pile anchor support system as an example. Soil pressure, internal force of pile, deformation of pile and prestress of anchor are monitored. The causes of the corresponding results are analyzed. It provides a reference basis for checking the rationality of theoretical design and calculation method and the accuracy of numerical simulation calculation. (4) the numerical simulation of the engineering is carried out by using the finite element software MIDAS/GTS. The distribution of deformation of supporting pile with time (construction process) is analyzed. (5) when the prestressed anchor is tensioning, the slot depth of the limited plate has a great influence on the tensioning effect, and the calculated result of classical earth pressure theory is larger than that of the actual monitoring earth pressure. It provides a certain basis for the safe and economical design and construction of similar foundation pit support engineering.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU753;TU317

【参考文献】