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Scattered row piles-brad wall combination supporting method

A technology of soil nailing and dredging, which is applied to sheet pile walls, excavation, construction, etc., can solve the problems of less consideration of excavation depth and stability, insufficient rigidity, weak shear resistance, etc. The effect of slope displacement, improving foundation pit stability, and strengthening boundary constraints

Inactive Publication Date: 2008-02-20
吴忠诚
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its insufficient rigidity and weak shear resistance, it cannot better play the role of deep passive soil, and its contribution to the overall stability of the support system is limited. There are few stability considerations, and there are still relatively large limitations in controlling and estimating the displacement range of soil nailed walls

Method used

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  • Scattered row piles-brad wall combination supporting method
  • Scattered row piles-brad wall combination supporting method
  • Scattered row piles-brad wall combination supporting method

Examples

Experimental program
Comparison scheme
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Embodiment

[0114]A project in Guangzhou is proposed to be a 30-story residential building with three basements. The excavation depth is about 12 meters. The main soil layers in the site are artificial fill, alluvial silty clay, residual silty clay and bedrock weathered layer, and the groundwater table is relatively shallow. The mechanical property parameters of each soil layer are:

[0115] The support scheme of sparse row piles and sprayed anchors is adopted, and the plane is shown in Figure 10.

[0116] Inclinometer monitoring has been carried out in this project, and its distribution curve is shown in Figure 11.

[0117] detailed analysis:

[0118] (1) After the earth pressure is reduced, the safety factor of the local stability of the soil between the piles is 1.23, and the safety factor when the arch structure is not considered is 0.98.

[0119] (2) Arch structure strength check

[0120] Meet the design requirements.

[0121] (3) Overall stability calculation

[0122] After r...

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Abstract

The invention discloses a scattered row pile-soil-nailed wall combination supporting method, which is characterized in that: the excavation and support sequence is that: a. the scattered pile is constructed according to certain pile spacing and the ratio of the pile spacing to the pile diameter, the pile is an arch foot pile; b. the pile is constructed with the technology of mixing pile or rotary jet grouting pile and a water-stopping curtain is applied to stop the water between the piles; c. the earthwork layer by layer is excavated for the construction of soil-nailed wall; d. pile support construction or bolt construction is made if the pile support or the bolt is encountered; e. the beam is constructed or the pillar is support; f. the support is sustained or stretch the bolt is stretched; g. the concrete spraying of soil nail is excavated layer by layer; h. the procedure b-g is repeated until the pit bottom is reached. The scattered row pile-soil-nailed wall combination support structure can effectively maintain the stability of the foundation pit and the side slope and control the displacement of the foundation pit and the side slope.

Description

technical field [0001] The invention relates to foundation engineering and side slope reinforcement and support engineering in building construction, in particular to a combination support method of sparse row piles and soil nail walls. Background technique [0002] At present, soil nailing walls are generally used in the construction of building foundation projects. Compared with other support technologies, soil nailing walls have the following advantages: short construction period, low project cost; light construction equipment, strong site adaptability; good ductility, damage The development period is long. However, it has obvious limitations, mainly because the displacement is larger than other forms, and it cannot be estimated reasonably; there are problems of uplift, piping and seepage at the pit bottom of the soft soil layer. [0003] The main types of composite soil nail walls widely used at present are: two or more combinations or composites of soil nails and ancho...

Claims

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Application Information

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IPC IPC(8): E02D17/20E02D17/04E02D5/00
Inventor 吴忠诚
Owner 吴忠诚
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