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Foundation pit flexible support active earth pressure calculating method considering action point position

A technology of active earth pressure, calculation method, applied in the field of geotechnical engineering

Inactive Publication Date: 2015-04-01
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above active earth pressure theory is not applicable to the field of flexible support structures

Method used

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  • Foundation pit flexible support active earth pressure calculating method considering action point position
  • Foundation pit flexible support active earth pressure calculating method considering action point position
  • Foundation pit flexible support active earth pressure calculating method considering action point position

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] Suppose a vertical foundation pit is 10 meters deep, and the soil around the foundation pit γ=18kN / m 3 , cohesion c=10kPa, internal friction angle φ=20°, image 3 is the function Φ with the action point position coefficient n a change curve. The calculation shows that when the position coefficient of the action point has upper and lower limit values ​​(lower limit value n ad =0.2677, upper limit n au =0.4906), within this range, Φ=0 value, that is to say, when the resultant force point of the support reaction force provided by the support structure is within the range of 2.677-4.906 from the bottom of the pit, the foundation pit can reach equilibrium and stability , otherwise no matter how much support reaction force is provided, when the soil is in an active state, the foundation pit must be unstable. Active earth pressure and sliding surface coefficient n a The change curve see Figure 4 , Figure 5 As shown, the active earth pressure is minimum at the lower li...

Embodiment 2

[0153] Take a sandy soil vertical foundation pit as a calculation example, the depth of the foundation pit is 10 meters, and the soil around the foundation pit γ=18kN / m 3 , cohesion c = 0, internal friction angle φ = 20°, Table 2 shows the calculation results of the upper and lower limits of the position coefficient of the action point under different conditions of sandy soil internal friction angle. It can be seen from the table that for sandy soil, under different internal friction angles, the lower limit coefficient of the position coefficient of the action point is n ad =1 / 3, the calculated pressure is completely consistent with the result calculated by Coulomb theory. In Table 2, △ is the increase ratio of the earth pressure at the upper limit value of the position coefficient of the action point to the lower limit value. It can be seen that the upper limit value of the position coefficient of the action point increases with the increase of the internal friction angle, an...

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Abstract

The invention relates to a foundation pit flexible support active earth pressure calculating method considering action point position. The method overcomes the shortcomings of a coulomb earth pressure calculating method and a rankine earth pressure calculating method. The method includes the following steps: determining accuracy control quantity eps, foundation pit geometric elements and earth body physical dynamic parameters; determining the position coefficient na of the active earth pressure resultant force action point; utilizing the curve y=s(x) to represent the earth body slip surface; determining the minimum value phi min of the function phi (x0,s0) to judge whether phi min is smaller than or equal to eps; finally calculating the resultant force of the slip surface equation and the active earth pressure. The foundation pit flexible support active earth pressure calculating method is line with reality, high in reliability and favorable for reasonable design and scientific management of pit foundation engineering.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to a method for calculating the active earth pressure of a foundation pit support structure, in particular to a calculation method for the active earth pressure of a foundation pit flexible support structure considering the position of an action point. Background technique [0002] The stress and deformation of the supporting structure during the excavation and use of the foundation pit is an extremely complicated problem, and there are many influencing factors. Correctly calculating the distribution and size of the lateral earth pressure in the foundation pit project is the premise of rational design of the foundation pit project. In a broad sense, earth pressure is the pressure that the soil acts on the engineering structure or on the surface of the structure surrounded by the soil or the resultant force of those pressures. In the design and construction of foundati...

Claims

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Application Information

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IPC IPC(8): G06F17/50E02D17/04
Inventor 陈建功谢强许明王桂林吴曙光赵鑫曜
Owner CHONGQING UNIV
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