Embedding stability analysis method suitable for narrow foundation pit

An analysis method and stability technology, applied in excavation, infrastructure engineering, construction, etc., can solve the problems of not considering the impact on the sliding stability of the lateral support structure, difficult to apply municipal foundation pits, etc., and achieve project saving cost, the effect of improving accuracy

Active Publication Date: 2019-01-04
广东省建工设计院有限公司
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Problems solved by technology

[0010] In view of the above problems, the present invention provides an embedded stability analysis method suitable for narrow foundation pits. Considering the problem of foundation pits, the influence of the opposite lateral support pile on the sliding stability is considered, and the accuracy of the calculation results for the safety evaluation is improved.

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  • Embedding stability analysis method suitable for narrow foundation pit
  • Embedding stability analysis method suitable for narrow foundation pit
  • Embedding stability analysis method suitable for narrow foundation pit

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Embodiment 1

[0077] The depth of the foundation pit is 4m, the width is 2m, and the safety level of the foundation pit is defined as three (K r =1.7), the soil layer is homogeneous soil, the natural weight of the soil γ=18kN / m 3 , cohesion c=7.5kPa, internal friction angle The steel plate is used as the support pile, and 2 internal supports are set. The center of the inner support in the lowest layer is 0.6m away from the bottom of the foundation pit, and the embedded length of the steel plate support pile is 2.4m. 0 =0kPa (that is, overloading is not considered. Overloading is an additional load in the industry to ensure the safety of the foundation pit. It is similar to adding a safety factor. It is an empirical value. If overloading is not considered, it will not affect the calculation accuracy), steel plate support The frictional resistance f=10kPa between the pile and the soil.

[0078] The lowest fulcrum (i.e. the intersection point of the inner support and the support pile) is 3m...

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Abstract

The invention discloses a embedding stability analysis method suitable for a narrow foundation pit. The embedding stability analysis method comprises the steps that (1) a foundation pit is supported by support piles and internal supports, whether the foundation pit is the narrow foundation pit or not is judged, specifically, through a conventional analysis method and analysis results, if the support piles on the opposite sides are located within the sliding face range, the foundation pit is the narrow foundation pit; and (2) all potential sliding faces are searched, the embedding stability ofall the sliding faces is calculated, and the sliding face with the minimum arc sliding stability security factor is the most unfavorable sliding face, wherein friction resistance between the support piles on the opposite sides and a sliding soil body and the contribution of active earth pressure to anti-sliding stability are considered for calculation of the embedding stability of the narrow foundation pit, and an anti-sliding security factor is judged through a formula (1). According to the embedding stability analysis method, by considering the friction resistance between the support piles on the opposite sides and the sliding soil body and the contribution of the active earth pressure to the anti-sliding stability, the accuracy of the calculation results to safety evaluation is improved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to an embedded stability analysis method 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 (that is, the embedded length Ld). [0003] 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: [0004] (1) Using the Prandtl (Prandtl) limit equilibrium theory formula based on the ultimate bearing capacity of the found...

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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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