Build-in length and uplift value calculating method applicable for narrow foundation pit

A calculation method and foundation pit technology, applied in excavation, foundation structure engineering, construction, etc., can solve problems such as ignoring the interaction between support structures and soil

Active Publication Date: 2019-01-04
广东省建工设计院有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] Aiming at the above problems, the present invention provides a method for calculating the embedding length and uplift amount suitable for narrow foundation pits. This method solves the problem that the existing calculation method ignores the interaction between the support structure and the soil, and introduces This method can fully reflect the influence of soil properties on the embedding length and uplift, and can be applied to foundation pits of any shape

Method used

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  • Build-in length and uplift value calculating method applicable for narrow foundation pit
  • Build-in length and uplift value calculating method applicable for narrow foundation pit
  • Build-in length and uplift value calculating method applicable for narrow foundation pit

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Embodiment 1

[0091] The depth of a foundation pit is h=4m, the width W=2m, the soil layer is homogeneous soil, and the natural weight of the soil is γ=18kN / m 3 , cohesion c=7.5kPa, internal friction angle Compression modulus E s =4.0MPa, use steel sheet piles as support piles for support, set up 2 internal supports, the center of the lowest internal support is 0.6m away from the bottom of the foundation pit, overload q 0 =9kPa, the frictional resistance between the steel sheet pile and the soil f=10kPa, excavation is divided into three steps, the excavation depth of the first step is 1m (the overload is also removed in this step), and the excavation depth of the second step is 1.5m , the third step excavation depth is 1.5m. in.

[0092] Such as figure 2 As shown, it is a schematic diagram of the unloading stress distribution after excavation of the foundation pit under the narrow foundation pit condition of the present invention, as Figure 6 As shown, it is a schematic diagram of t...

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Abstract

The invention discloses a build-in length and uplift value calculating method applicable for a narrow foundation pit. The calculating method comprises the step (1) of judging whether a foundation pitis the narrow foundation pit, a supporting structure of the foundation pit comprises support piles and inner supports, if the ratio of the foundation pit depth to the foundation pit width is larger than 1, and the influence of frictional resistance between the supporting structure and soil mass in the pit on the stress and deformation state of the soil mass in the pit prevails, the foundation pitis the narrow foundation pit; and the step (2) of obtaining the build-in length of the foundation pit according to the condition that the unloading stress of the bottom surface position of the foundation pit is equal to the frictional resistance between the soil mass at the position and the supporting structure when the pit is evacuated to the pit bottom in one time. According to the method, the interaction between the supporting structure and the soil mass is introduced; and the method can reflect the influence of the soil mass property on the build-in length and the uplift value fully, and can be applied to foundation pits of any shape.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, in particular to a method for calculating the embedding length and uplift amount suitable for narrow foundation pits. Background technique [0002] Supporting piles plus internal support is one of the most widely used supporting technical schemes in foundation pit engineering. During the design and calculation of this scheme, it is necessary to analyze the embedded stability of the supporting piles in order to determine that the supporting piles need to enter The length below the bottom of the foundation pit (i.e. the embedded length). At present, the analysis work in the industry is mainly carried out according to the current specification "Technical Regulations for Building Foundation Pit Support" JGJ120-2012. There are two cases of embedding stability analysis: [0003] (1) Using the Prandtl (Prandtl) limit equilibrium theory formula based on the ultimate bearing capacity of the found...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 陈艳平万雄斌曾红川叶蓓丁蕾范炳礼王华邬龙刚吴子儒梁润泽吴太广杨峰
Owner 广东省建工设计院有限公司
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