Confined water stratum foundation pit bottom soil layer pile foundation reinforcing pile distance and pile length prediction method

A technology of foundation pit bottom and prediction method, which is applied in the field of infrastructure construction, can solve problems such as lack of theoretical basis, and achieve the effect of strong process, convenient implementation and simple structure

Pending Publication Date: 2019-08-02
FUJIAN UNIV OF TECH
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Problems solved by technology

[0003] At present, there is no corresponding theoretical basis for pile distance and pile length.

Method used

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Embodiment Construction

[0018] In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail as follows, but the present invention is not limited thereto.

[0019] A method for predicting the pile distance and pile length of pile foundation reinforcement in the soil layer at the bottom of foundation pit in confined water stratum, comprising the following steps:

[0020] (1) Determine the stratum distribution in the site: carry out geological drilling in the site to reveal the stratum distribution in the site. The thickness of the soil layer is , ;

[0021] (2) Determine the pressure of the confined water , according to the geological drilling results, determine the buried depth of the impermeable floor , The distance between the stable head of the confined water and the bottom of the impermeable layer ,and then ,in, For the weight of water, take 10kN / m 3 ;

[0022] (3) Determine th...

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Abstract

The invention relates to a confined water stratum foundation pit bottom soil layer pile foundation reinforcing pile distance and pile length prediction method which is suitable for the field of foundation construction and comprises the following steps that stratum distribution in a site is determined; geological drilling is conducted in the site, the stratum distribution of the site is revealed, and the thickness of the soil body of the ith layer is obtained by the formula in the specification; the pressure of confined water is determined; the undrained shear strength and the weight of the soil body overlying each soil layer on the confined water of the site are determined; the weighted average undrained shear strength of the stratum soil body overlying the confined overwater according tothe depth, and the weighted average weight according to the depth are determined, wherein (please see the formula in the specification); the diameter of a driven pile foundation and the side length ofa pile cap are determined according to construction conditions; a pile distance is determined; the limit side friction force between the pile foundation and the confined water soil body is determined; and the length of the pile foundation is determined. The prediction method has the advantages of being high in process property and convenient to implement.

Description

technical field [0001] The invention relates to a pile foundation reinforcement pile distance and pile length prediction method at the bottom of a foundation pit in a pressurized water stratum, which is applicable to the field of foundation construction. Background technique [0002] Confined water is a common type of groundwater occurrence. In some formations, the pressure is often relatively high, which creates a large pressure on the overlying impermeable layer. At the same time, under the action of the overlying impermeable layer's own weight and the gravity of the upper soil, the confined water can remain stable. Once the upper pressure is relieved or partially relieved, the confined water may break through the overlying impermeable layer, resulting in damage to the soil layer, and the confined water gush. In foundation pit excavation, when there is confined water at the bottom of the pit, this problem must be paid special attention to. However, sometimes for engineer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00E02D27/12E02D1/02
CPCE02D1/022E02D27/12E02D33/00
Inventor 罗才松陈华艳叶建峰王启云吴琛郑居焕刘春亮
Owner FUJIAN UNIV OF TECH
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