临江地下结构抗浮计算方法研究

发布时间：2018-03-04 04:19

本文选题：地下结构　切入点：二元地层　出处：《岩土力学》2017年10期 　论文类型：期刊论文

【摘要】：临江地下结构进行浮力计算时,其抗浮设计水位直接采用地面高程或江河水位是不合理的,需要对场地进行渗流分析才能确定。在沿用本奈特假定的前提下,推导出一种简化算法用于临江二元地层的渗流分析,可得到强透水层中的水头分布。在此基础上,提出地下结构物底板水压力的实用计算方法为抗浮设计提供依据。其方法适用于堤前、堤后覆盖层有不同的厚度和渗透系数,以及宽度为有限或无限的边界情况。该法计算简便,结果足够精确。经过算例验证和比较,堤后小型结构物对强透水层中的水头分布影响不大,但大型结构物和堤后宽度收窄将会显著抬高水头。位于覆盖层中的地下室底板浮力呈中部大、四周小的分布形态,但位于强透水层中时则呈线性分布。
[Abstract]:When the buoyancy calculation is carried out on the underground structure near the river, it is unreasonable that the surface elevation or river water level should be directly used in the design water level of the anti-floating design, and the seepage analysis of the site is needed to determine it. Under the premise of using Bennett's assumption, A simplified algorithm is derived for the seepage analysis of binary strata in Linjiang River. The water head distribution in the strong permeable layer can be obtained. A practical method for calculating the water pressure on the bottom slab of underground structure is presented, which provides a basis for anti-floating design. The method is applicable to the front of the embankment, and the overburden behind the embankment has different thickness and permeability coefficient. And the boundary case with limited or infinite width. The method is simple and accurate enough. The small structure behind the embankment has little effect on the water head distribution in the strong permeable layer. However, when the width of large structure and the back of embankment is narrowed, the water head will be raised significantly. The buoyancy of basement floor in the overburden is large in the middle and small in the surrounding area, but it is linearly distributed in the strong permeable layer.
【作者单位】：华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：岩土力学与工程国家重点实验室资助课题(No.Z015013) 华南理工大学中央高校基本科研业务费(No.20152M024)~~
【分类号】：TU93

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