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Calculation method of prestress loss based on the coupling of anchor cable prestress loss and rock and soil creep

A calculation method and rock-soil technology, applied in the direction of foundation structure engineering, buildings, sheet pile walls, etc., can solve the problems of not considering the relationship between stress relaxation and creep coupling effects, and cannot correctly describe the coupling effect relationship

Active Publication Date: 2016-10-26
SHANDONG UNIV OF SCI & TECH +1
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Problems solved by technology

[0011] The purpose of the present invention is to provide the calculation of prestress loss based on the coupling of anchor cable prestress loss and rock and soil creep, which solves the problem that the commonly used rheological calculation models of rock and soil do not consider the coupling effect relationship between stress relaxation and creep. It is accurate when describing a single property of rock and soil mass. However, if the coupling effect relationship between rock and soil mass creep and prestress loss is considered, the current rheological model of rock and soil mass cannot correctly describe the relationship between the two. The problem of the coupling effect relationship

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  • Calculation method of prestress loss based on the coupling of anchor cable prestress loss and rock and soil creep
  • Calculation method of prestress loss based on the coupling of anchor cable prestress loss and rock and soil creep
  • Calculation method of prestress loss based on the coupling of anchor cable prestress loss and rock and soil creep

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Embodiment 1

[0098] The first step is to select a representative prestressed anchor cable to anchor the engineering slope.

[0099] A high slope of the Ring Expressway in Jinan City, Shandong Province, is located in the hilly area in the south of Jinan. U-shaped valleys are developed. The slope height is 78.3 meters. The surface rock mass is weathered and loose and broken. Larger, the strength of the rock mass decreases due to changes in the hydrostatic pressure or hydrodynamic pressure of the groundwater, and the rock mass parameter c after the slip surface encounters water, As the value decreases, the shear resistance of the sliding surface weakens. With the continuous infiltration of fissure water, the shearing capacity of the rock mass is reduced, and the ability to resist sliding is also reduced. After the fissure is filled with seepage water, it will swell. Creep deformation occurs on the slope surface, which makes the layered rock mass on the slope surface bend and deform, and fin...

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Abstract

The invention discloses a prestressing loss computing method based on anchor cable prestressing losses and rock-soil body creep coupling. The method comprises the steps of selecting a slope with uniform soil body materials and properties and poor stability, determining slope rock-soil body physical and mechanical parameters, determining the water content W, the volume-weight r, the uniaxial compressive strength Rc, the tensile strength Rt, the deformation modulus Eo, the cohesive force C and the internal friction angle phi of the rock-soil body, determining a creep curve equation of the rock-soil body, determining the instantaneous elasticity modulus Eh, the hysteresis elasticity modules Ek and the viscosity coefficient eta k of the rock-soil body, substituting the parameters into a relaxation equation of a coupling effect calculation model to work out a relational expression of anchor cable stress changes and time, working out an anchor cable stress value of each time point according to the relational expression of the anchor cable stress changes and the time, and then obtaining the anchor cable presressing loss quantity according to the stress calculated value of each time point. According to the prestressing loss computing method, the prestressing anchor cable stress state changing phenomenon can be correctly reflected.

Description

technical field [0001] The invention belongs to the technical field of prestressed anchor cable anchoring engineering, and relates to the calculation of prestress loss based on the coupling of anchor cable prestress loss and rock and soil creep. Background technique [0002] When solving the stability problems of high and steep slopes that accompanies the construction of open-pit mining projects, highway projects, high-speed railway projects and dam projects, the prestressed anchor cable anchoring technology is the best way to solve the problem of high and steep slope reinforcement. The key technology, its technological advancement and effect reliability have been confirmed by a large number of engineering practices, and have been widely promoted and applied. [0003] Although the prestressed anchor cable has played an important role in controlling the stability of high and steep slopes, it has prevented the occurrence of landslides on unstable slopes. However, high and ste...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/74
Inventor 王清标张聪施振跃温小康王辉吕荣山许垒张军贤王天天胡忠经白云
Owner SHANDONG UNIV OF SCI & TECH
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