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本文介绍某70m高(14层)邮电通信枢纽楼悬臂箱基(置于中砂层地基)的原体工程测试结果。实测表明:悬臂端纵向平均基底反力小于悬臂根部之值而大于箱基中部的纵向平均基底反力,基底反力曲线呈马鞍形,基底反力集度较文献[1]的第四纪粘性土小,反力曲线更趋平缓均匀;悬臂箱基的钢筋应力很小(-13.8～15.2MPa);悬臂箱基-框架体系的中和轴亦有上移现象。 本文还对砂垫层的作用提出了新的看法。
This article describes the test results of the original body engineering of a cantilever box foundation (in the middle sand layer foundation) of a 70m high (14th) post and telecommunication hub building. The measured results show that the longitudinal average basement reaction force at the end of the cantilever is smaller than the value of the cantilever root but greater than the longitudinal average basement reaction force at the middle of the box foundation. The base reaction force curve is saddle-shaped and the basement reaction force concentration is lower than the Quaternary viscosity of the literature [1]. The soil is small, and the reaction curve is even and even; the steel stress of the cantilever box foundation is very small (-13.8 to 15.2 MPa); the neutral axis of the cantilever box-frame system also moves upward. This article also puts forward new views on the role of sand cushions.