岩体基坑地下室抗浮设计水头合理取值研究

发布时间：2018-11-18 06:20

【摘要】：本文主要围绕岩体基坑地下室抗浮设计水头取值问题，针对平坦地貌和坡地地貌对其进行研究。通过理论分析提出施工期间极端天气条件下，地下室抗浮水头取值建议公式，以便设计和施工单位根据研究结论制定相应抗浮措施，满足工程实际需要。首先，分析了岩体基坑的地质特点、地下水的赋存形式及来源，阐述了回填土对地下结构抗浮设计的影响、地下水的渗流特性和基本定律。其次，通过研究基坑地下水位增量的计算方法，给出了平坦地貌岩体基坑施工期间的抗浮水头取值建议公式，并定量分析了不同条件下的抗浮水头值。第三，针对坡地地貌岩体基坑的特点，依据渗流学和流体力学基本原理，以二维稳定流为前提，得出降雨条件下的水头计算模型，为后续分析奠定理论基础。第四，制作试验模型，将坡度和降雨量作为变量，模拟坡地地貌岩体基坑地下室周边回填土在暴雨时期地下水位的变化情况，根据试验结果改进水头曲线模型，简化抗浮水头取值公式。第五，，利用GeoStudio软件对室内模拟试验工况进行有限元分析，验证简化的抗浮水头取值公式的合理性。最后，结合青岛崂山市民文化中心工程，通过现场水位测试，分析其抗浮设计的合理性，验证抗浮水头计算公式的实用性。
[Abstract]:This paper focuses on the selection of the head of the basement anti-floating design of rock foundation pit, and studies the flat geomorphology and the slope geomorphology. Based on the theoretical analysis, this paper puts forward the suggested formula for selecting the value of anti-floating head of basement under extreme weather conditions during construction, so that the design and construction units can formulate the corresponding anti-floating measures according to the research conclusions, and meet the practical needs of the project. Firstly, the geological characteristics of rock foundation pit, the occurrence form and source of groundwater are analyzed, and the influence of backfill on the design of subsurface structure anti-floating, the seepage characteristic and basic law of groundwater are expounded. Secondly, by studying the calculation method of the increment of groundwater level of foundation pit, the formula of the value of anti-floating head during the construction of foundation pit of flat geomorphic rock mass is given, and the value of anti-floating head under different conditions is quantitatively analyzed. Thirdly, according to the characteristics of slope geomorphologic rock foundation pit, according to the basic principles of seepage and hydrodynamics, the hydraulic head calculation model under rainfall condition is obtained on the premise of two-dimensional steady flow, which lays a theoretical foundation for subsequent analysis. Fourth, make the test model, take slope and rainfall as variables, simulate the change of groundwater level around the basement of foundation pit of slope geomorphology, improve the model of water head curve according to the test result. Simplify the value formula of anti-floating head. Fifthly, the finite element analysis of indoor simulated test condition is carried out by using GeoStudio software, which verifies the rationality of the simplified formula for selecting the value of anti-floating head. Finally, the rationality of the anti-floating design is analyzed through the on-site water level test, and the practicability of the calculation formula of anti-floating head is verified by combining the project of Laoshan City Citizen Culture Center in Qingdao.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU943.1

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