Bousinesq和Westergaard公式在分析失效通信桅杆地基应力分布中的应用
Application of Bousinesq's and Westergaard's formulae in analysing foundation stress distribution for a failed telecommunication mast
摘要：
尼日利亚和世界各地的电信塔同时发生地基破坏，危及电信塔坠落距离内居民的生命和财产安全，是一个令人高度关注的问题。本文以尼日利亚奥约州伊巴丹的GSM桅杆为研究对象，对该桅杆的地基破坏进行了分析，并提出了相应的工程解决方案。全球移动通信系统（GSM）电信塔的土壤调查包括实验室试验：对获得的土壤样品进行筛分分析、阿太堡极限和含水量试验，同时在现场进行荷兰锥形土压力计试验，以确定不同深度土壤的允许承载压力。应用Boussineq和Westergard的点荷载公式，用Java程序模拟计算了不同预定深度处的应力分布，揭示了结构破坏基础下的应力分布规律。应力分布模式显示，土壤强度低于结构施加的荷载，从而导致不均匀沉降和裂缝的基础。提出了各种工程解决方案，以提高土壤强度，从而防止未来发生此类事件。
英文摘要：
The concurrent foundation failure of telecommunication masts in Nigeria and all over the world which endanger the lives and properties of residents situated within the fall distance of the telecommunication mast are a thing of great concern. In this study, a GSM mast that underwent foundation failure at Ibadan, Oyo State, Nigeria was critically examined with a view to providing engineering solution. The soil investigation at the global system for mobile communications (GSM) telecommunication tower comprised of laboratory tests: sieve analysis, Atterberg limits and moisture content tests were carried out on the soil samples obtained while Dutch cone penetrometer test was performed on the site to a depth of refusal to determine the allowable bearing pressure at various depths of the soil. The application of Boussineq's and Westergard's formulae for point loads using Java programme to simulate and compute the stress distribution at various predetermined depths showed the stress distribution pattern beneath the failed foundation of the structure. The stress distribution pattern revealed that the soil strength was lower than the imposed loadings from the structure thereby resulting in differential settlements and cracks at the foundation. A variety of engineering solutions were recommended to improve the soil strength and thus prevent such occurrences in future.
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