Design and Calculation of Plane Stability of Concrete Support for Foundation Pit
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摘要: 基坑相关规范对基坑支撑平面内的计算长度系数规定不详,通常对支撑平面内计算长度系数取为1.0。通过对基坑混凝土支撑的平面稳定性进行分析,认为按框架布置的支撑平面内稳定性不容忽视,且为支撑承载力的主控要素,平面内的计算长度系数大于1。根据稳定屈曲理论,提出了一种简单适用的长度计算系数公式,并提出提高支撑稳定性的关键措施。Abstract: Regulations concerning foundation pits often lack specific provisions regarding the calculation length factor within the plane of pit supports, commonly assuming a value of 1.0. Through an analysis of the planar stability of foundation pit concrete supports it is evident that the stability within the support plane, arranged as a framework, cannot be overlooked and constitutes a primary controlling factor for support-bearing capacity, implying a calculation length factor greater than 1. Drawing from the theory of stable buckling, a simple and applicable length calculation coefficient formula is proposed, along with key measures to improve support stability.
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Key words:
- foundation pit /
- concrete support /
- in-plane stability /
- calculated length coefficient
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表 1 边撑及中撑计算长度系数与
$ k $ 值的关系$ k $ 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 $ {\mu }_{\mathrm{中}} $ 2.21 1.72 1.52 1.41 1.34 1.29 1.25 1.22 1.20 1.18 $ {\mu }_{\mathrm{边}} $ 2.95 2.21 1.90 1.72 1.60 1.52 1.46 1.41 1.37 1.34 -
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