Large-scale full-scale test-based method for determining size threshold value of anchoring structural surface

Abstract

The invention discloses a large-scale full-scale test-based method for determining the size threshold value of an anchoring structural surface. The method comprises the following steps of: 1) manufacturing a concrete full-scale sample of the anchoring structural surface; 2) carry out full-scale direct shear testing on the sample containing a single row of anchor rods by utilizing a large-scale direct shearing instrument, monitoring the shear stress and the displacement in the sample in real time and processing the data by utilizing matrix laboratory (MATLAB) software to obtain the shear strength of the anchoring structural surface; 3) calculating the resistance contribution of the single anchor rod; 4) sequentially increasing the number of the anchor rods in the shear direction of the sample and repeating the step 2) to sequentially calculate the resistance contribution of the single anchor rod; and 5) carrying out nonlinear fitting on the multiple groups of data by utilizing the MATLAB software and when adjacent data points on the fitted line meet a formula (2), determining that the size of the corresponding anchoring structural surface is the size threshold value and carrying outslope anchoring design by utilizing the size threshold value. The method disclosed by the invention has the beneficial effects that the reliability and the scientificity of test results are increased; and the waste of human and material resources, which is caused by excessive repetitive tests, is avoided.

Description

technical field [0001] The invention belongs to the technical field of indoor physical and mechanical tests, and relates to a method for determining the size threshold of an anchoring structure surface based on a large-scale full-scale test. Background technique [0002] The rapid development of my country's economy is inseparable from the support of large-scale engineering projects, such as large-scale hydropower projects in the central and western regions, highways and high-speed railways, deep resource mining, strategic oil reserves, and nuclear power projects. Structural planes generally exist in engineering rock mass, and blocks in rock mass often shear slip or displace along structural planes, resulting in a decrease in the stability and integrity of engineering rock mass, especially in landslide geology of large open-pit mine slopes. Disasters, ranging from seriously affecting production, causing casualties and heavy losses of equipment and mineral resources. Anchor ...

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Problems solved by technology

[0003] In order to overcome the problem of waste of materials and increase the potential safety hazards of the test existing in the existing anchoring structural surface test, the present invention provides a method for determining the size threshold of the anchoring structural surface based on a large-scale full-scale test. The large-scale full-scale test carried out It can avoid the problem of size effect from the indoor t

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