An Embedded Stability Analysis Method Applicable to Single-layer Support in Narrow Foundation Pit

A stability and foundation pit technology, applied in the field of embedded stability analysis, can solve the problem of not taking into account the actual situation of narrow foundation pits, and achieve the effects of saving engineering volume, improving calculation results, and improving accuracy

Active Publication Date: 2019-05-28
ARCHITECTURAL DESIGN RES INST OF GUANGDONG PROVINCE
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Problems solved by technology

However, when the current calculation method is used for the embedding stability of the single-layer support support structure, the calculation method of the soil reaction force inside the foundation pit is either the classical method or the elastic fulcrum method. As far as narrow foundation pits are concerned, neither of them takes into account the actual situation of narrow foundation pits, and both have certain limitations.

Method used

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  • An Embedded Stability Analysis Method Applicable to Single-layer Support in Narrow Foundation Pit
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  • An Embedded Stability Analysis Method Applicable to Single-layer Support in Narrow Foundation Pit

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Embodiment 1

[0061] 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 e =1.15), the soil layer is homogeneous soil, and the natural weight of the soil in the pit above the bottom of the support structure γ m1 =18kN / m 3 , the natural heavy cohesion of the soil outside the pit above the bottom of the support structure γ m2 =18kN / m 3 , c=0kPa below the bottom surface of the retaining member, internal friction angle φ=10 0 , the horizontal reaction force coefficient k of the soil s =8000kN / m 3 , using steel plates as support piles, setting up an internal support, the center of the support is 3.0m away from the bottom of the foundation pit, the embedded length is tentatively set at 3m, and the calculated width of the unit is 1m.

[0062] The calculation and analysis process is as follows:

[0063] First judge whether the foundation pit is a narrow foundation pit:

[0064] The projected width of the rupture surface in...

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Abstract

The invention discloses an embedded stability analysis method for a single-layer bracing condition of a narrow foundation pit, which comprises the following steps: (1) when a passive earth pressure rupture surface of a soil body in the pit intersects with a position below the bottom surface of the pit, the pit can be judged as narrow foundation pit; (2) the stress mode of the retaining structure under the condition of narrow foundation pit single-layer support is put forward as follows: under the condition of narrow foundation pit, the soil force on the retaining structure can be divided intotwo regions, squeeze region and passive region. (3) the upper limit value of soil force on retaining piles in classical method or elastic fulcrum method is passive earth pressure, and the upper limitvalue of soil force on retaining piles in compression zone of narrow foundation pit under single-layer support condition is modified to be soil horizontal reaction coefficient multiplied by the upperlimit value of compression deformation; (4) a formula for calculating the safety factor of embedded stability of retaining structure under the condition of narrow foundation pit single-layer bracing is put forward. The formula can be used to calculate the stability of embedded length of narrow foundation pit with single-layer bracing, and it is more suitable for the practical conditions of narrowfoundation pit.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and specifically relates to an embedded stability analysis method applicable to single-layer support conditions of narrow foundation pits. Background technique [0002] Supporting piles plus internal support is one of the most widely used supporting technical solutions in foundation pit engineering. When only one support is required, the design calculation needs to analyze the embedded length of the supporting piles in order to meet the The embedded stability safety factor requirement required in Article 4.2.2 of "Building Foundation Pit Support Technical Regulations" JGJ120-2012 determines the length of the support pile that needs to enter below the bottom of the foundation pit (that is, the embedded length Ld). [0003] At present, for the analysis of the embedded length in the above cases, the industry is mainly based on the formula 4.2.2 in the current specification "Technica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50E02D17/04
CPCE02D17/04G06F30/13G06F30/20
Inventor 陈艳平邬龙刚曹旭华霍文斌李巍陈伟陈海斌王华饶欣频王健刘光明金学锋
Owner ARCHITECTURAL DESIGN RES INST OF GUANGDONG PROVINCE
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