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Structural design method for load-bearing section of miniature anti-slip compound pile

A technology of structural design and combined piles, which is applied in the direction of foundation structure engineering, excavation, sheet pile walls, etc., to achieve the effects of improving bending stiffness, accurate results, and ensuring safety

Inactive Publication Date: 2015-07-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no scientific and reasonable design method for the pile body structure of the loaded section of the miniature anti-slide composite pile.

Method used

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  • Structural design method for load-bearing section of miniature anti-slip compound pile
  • Structural design method for load-bearing section of miniature anti-slip compound pile
  • Structural design method for load-bearing section of miniature anti-slip compound pile

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: according to the appended figure 1 And attached figure 2 For the slope shown, according to the sliding body 3 and sliding surface 4 of the rock and soil of the slope, a micro anti-sliding composite pile 1 is designed, including a top beam 2 and a micro pile 5, and the micro pile 5 is provided with a main reinforcement 6 and a stirrup 7. After the on-site geological survey, the mechanical properties of the rock and soil mass of the slope are determined through tests; the stability of the slope is evaluated, and the remaining sliding thrust of the slope is calculated Q .

[0035] Consider the adjustment and distribution of the remaining sliding thrust of the slope between the piles, and determine the distribution ratio of the remaining sliding thrust of each pile; Figure 4 The calculation model diagram of the miniature anti-sliding composite pile is shown, and the sliding thrust acting on the rear, middle and front piles is calculated as q 1 , q 2 ,...

Embodiment 2

[0057] Example 2: The total length of the K38+560~K38+680 side slope of Tongping Expressway is 120m. From top to bottom, the slope engineering strata are 15-30m strongly weathered sandy slate, 4.0m strongly weathered carbonaceous shale, and 14.4-14.8m moderately weathered sandy slate. Carbonaceous shale is exposed on the 1st and 2nd grade slopes. The physical parameters of slope rock and soil are shown in Table 1. The initial design maximum excavation height of the slope was 34.8m. When the slope was excavated to the first-level platform, a landslide occurred after heavy rainfall. After the landslide, the slope was trimmed, and the maximum excavation height after the trimming was 53.8m.

[0058] Table 1 Physical and mechanical parameters of slope rock and soil

[0059]

[0060] Design miniature anti-sliding tissue pile with the method of the present invention, as attached Figure 9 Shown, comprise front pile 8 and back pile 9. Calculate the maximum remaining slope rem...

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Abstract

The invention discloses a structural design method for a load-bearing section of a miniature anti-slip compound pile. The method comprises the following steps: 1, performing a field geological survey, and determining mechanical properties of a geotechnical slope body through tests; 2, evaluating the stability of a slope, and calculating the residual slide thrust of the slope; 3, considering the adjustment and the distribution of the slide force among piles of the miniature anti-slip compound pile, and determining the distribution ratio of the slide force under each pile; 4, calculating to obtain the residual slide thrust borne by each pile; 5, calculating the bending moment, the shearing force, corners and the displacement of the load-bearing section of each pile; 6, performing reinforcement design on the miniature anti-slip pile according to the calculated bending moment; and 7, rechecking designed reinforcing bars according to the calculated shearing force. According to the design method, the residual slope slide thrust distribution conditions of each pile of the miniature anti-slip compound pile are determined, the reinforcing function of each pile body in the combined pile consisting of multiple piles is determined, the distribution of the anti-slip effect on each pile is obtained, the structure effect and the pile-soil action effect of the miniature anti-slip compound pile are considered, and the internal force calculation result is accurate and scientific, so that the bending resistance, the shearing resistance and the safety of the miniature anti-slip compound pile are guaranteed.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a design method for miniature anti-slide piles used in landslide or side slope treatment. Background technique [0002] Miniature anti-slide piles refer to mechanically drilled cast-in-situ piles with a pile diameter of 90mm to 300mm. The pile body is embedded in the stable rock mass of the slope to provide anti-slide force to support the upper sliding body, thereby reinforcing the slope. Its main advantages are: mechanical hole forming, high construction safety; small construction machinery and tools, strong adaptability to the site; strong adaptability to the soil layer; small construction vibration, small disturbance to the slope soil; low construction noise, suitable for the environment Areas where pollution is strictly controlled; construction speed is fast, suitable for emergency projects. [0003] Due to the small pile diameter and low anti-sliding rigidity of the miniatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/20E02D5/34
Inventor 胡毅夫王庭勇罗卫华马莉
Owner CENT SOUTH UNIV
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