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Loess area vertical shaft wall space active soil pressure measuring and calculating method based on combined strength

An active earth pressure and loess area technology, which is applied in shaft equipment, earthwork drilling, complex mathematical operations, etc., can solve problems such as large numerical errors and unreasonable calculation of active earth pressure

Inactive Publication Date: 2022-04-22
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for measuring and calculating the active earth pressure of the shaft wall space in the loess area based on the joint strength, which solves the unreasonable calculation of the active earth pressure of the shaft wall space based on the Mohr-Coulomb strength theory in the prior art, and the numerical error is large The problem

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  • Loess area vertical shaft wall space active soil pressure measuring and calculating method based on combined strength
  • Loess area vertical shaft wall space active soil pressure measuring and calculating method based on combined strength
  • Loess area vertical shaft wall space active soil pressure measuring and calculating method based on combined strength

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Embodiment

[0090] The measured soil parameters of the surrounding rock outside the shaft wall in the loess area are as follows: the outer diameter of the shaft R = 4m, the total depth of the shaft z a = 25m, loess weight γ = 17kN / m3 , cohesion c=25kPa, internal friction angle Tensile strength σ t = 16kPa; Substituting these measured test parameters into the aforementioned formula (19), the values ​​of active earth pressure in the shaft wall space at different depths are obtained, see Table 1.

[0091] Table 1. Calculated values ​​of active earth pressure in shaft wall space at different depths

[0092] depth z i (m)

[0093] According to the measured values ​​in Table 1, the distribution curve of the active earth pressure on the shaft wall space in the loess area based on the joint strength under the Hal-Karmen condition and the depth of the shaft is obtained, see Figure 5 .

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Abstract

The invention discloses a loess area vertical shaft wall space active soil pressure measuring and calculating method based on combined strength. The method comprises the steps that 1, an equilibrium differential equation based on loess area vertical shaft wall outer side surrounding rock is constructed; 2, determining yield conditions of surrounding rocks on the outer side of the shaft wall of the loess area based on the combined strength; 3, constructing an expression of a stress component of surrounding rock on the outer side of the shaft wall of the loess area in an active limit state; and 4, determining the space active soil pressure of the shaft wall of the loess area vertical shaft based on the combined strength under the Haar-Karman condition. According to the method, under the Haar-Karman condition, the balance condition when any point of the surrounding rock on the outer side of the loess area vertical shaft wall is in the active limit balance state is established based on the combined strength, and the space soil pressure formula of the loess area vertical shaft wall in the active limit balance state is obtained; technical support is provided for measurement and calculation of loess area vertical shaft wall soil pressure, and the method is suitable for supporting a loess area vertical shaft structure.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and relates to a method for measuring and calculating active earth pressure in shaft wall space in loess area based on joint strength. Background technique [0002] Loess is widely distributed in Northwest China. When building a shaft structure in the loess area (hereinafter referred to as the loess area), the shaft structure made of reinforced concrete is a typical underground space structure. There is a complex interaction force between them, that is, the spatial earth pressure; and when the loess surrounding rock outside the shaft structure reaches the active limit state, the spatial earth pressure acting on the horizontal direction of the shaft wall is the active earth pressure of the shaft wall space. The stress and deformation of the shaft structure in the loess area during excavation and use is an extremely complex problem with many influencing factors. Correctly calculatin...

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Application Information

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IPC IPC(8): G06F30/13G06F17/13E21D8/00G06F119/14
CPCG06F30/13G06F17/13E21D8/00G06F2119/14
Inventor 李荣建张世斌李荣锦刘军定白维仕
Owner XIAN UNIV OF TECH