Foundation pit support design method

A technology of foundation pit support and design method, which is applied in excavation, foundation structure engineering, and field foundation soil survey, etc., and can solve the problem of incomplete calculation results.

Active Publication Date: 2018-09-28
CHINA COMM NORTH ROAD & BRIDGE
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the actual measured deformation, earth pressure, and supporting axial force of the foundation pit under normal working conditions are usually not completely consistent with the classical theoretical calculation results.

Method used

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Embodiment Construction

[0025] Embodiments of the foundation pit support design method according to the present invention will be described below with reference to the accompanying drawings. Those skilled in the art would recognize that the described embodiments can be modified in various ways or combinations thereof without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Also, in this specification, the drawings are not drawn to scale, and like reference numerals denote like parts.

[0026] The foundation pit support structure includes enclosure structures surrounding the foundation pit and inner supports supported between the enclosure structures. Such as figure 1 As shown, the present invention regards the enclosure structure 10 as a vertically placed foundation beam, regards the foundation soil as a series of vertically arranged earth springs, and obtains the basic model...

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Abstract

The invention discloses a foundation pit support design method. A foundation pit support comprises building envelopes surrounding a foundation pit and an inner support supported between the building envelopes. The design method comprises the following steps that the building envelope in the unit width range is simulated into a foundation beam in the vertical direction, the foundation beam is divided into a plurality of beam units in the vertical direction, foundation soil on the two sides of the building envelope is regarded as a series of soil springs arranged in the vertical direction, and avertical bearing constraint is arranged at the bottom of the building envelope; structure calculation is conducted through the finite element method, the deformation situation of a support structureand the elastic supporting force situation of the soil springs are calculated, according to the load loading manner, along with downward excavation, the soil spring constraint on the excavated side isreleased in the excavated area, and the driving soil pressure load is applied to the non-excavation side; according to a calculation result, the pulled soil spring constraint is released; and operation is conducted again, adjustment and calculation are repeatedly conducted, multi-time model adjustment is conducted according to the building envelope deformation situation and the elastic supportingforce situation of the soil springs till the stress state meets the requirement.

Description

technical field [0001] The invention relates to the field of construction, in particular to a design method for foundation pit support. Background technique [0002] With the rapid development of urban construction, more and more attention has been paid to the utilization of underground space, and the requirements for the enclosure structure of deep foundation pits have become more and more stringent. The foundation pit support is mainly to resist the soil outside the foundation pit, so the determination of the earth pressure will be the key to the calculation of the foundation pit support. Rankine's earth pressure theory establishes the horizontal earth pressure formula of the wall back under the condition that the wall back is smooth, and the earth pressure given is a linear distribution; Coulomb's earth pressure theory only gives the resultant force of the earth pressure, but does not give the distribution of the earth pressure. Most of the practical applications assume ...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D1/02
CPCE02D1/022E02D17/04
Inventor 刘丹娜殷胜光邵文泽
Owner CHINA COMM NORTH ROAD & BRIDGE
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