An optimization method for the design and optimization of debris flow prevention and control parameters considering the freeze-thaw cycle effect

Abstract

The invention provides a design optimization method for debris flow prevention and control parameters considering freeze-thaw cycle effects. First, the original friction coefficient and thickness of permafrost, seasonal frozen soil and deep non-frozen soil in the engineering area are obtained according to the survey data; According to the reduction rate formula obtained from statistical data, combined with the design service life (ie, the number of freeze-thaw cycles) and the thickness of seasonal frozen soil, the friction coefficient of the frozen-thawed soil layer is reduced; According to the relative relationship of layer depth, check and calculate the anti-sliding stability of the structure according to the three situations, and finally compare the anti-sliding stability coefficient with the required slip safety coefficient, and proceed to the next step of design based on the results. The invention solves the problem that the friction coefficient and anti-slip coefficient of the basement are lower than the design value caused by the influence of the freeze-thaw cycle, and can strengthen the pertinence and accuracy of the value selection of the prevention and control engineering design parameters, prevent and reduce obstruction Deformation and failure of sand bar under frost heave and thaw settlement conditions.

Description

Technical field [0001] The present invention belongs to the field of geotechnical technology, and in particular, the present invention relates to a method of designing optimization of mudslide prevention parameters considered to a frozen cycle effect. Background technique [0002] Alpine and high altitude of geotechnical body in the freeze-thaw circulation process, the effect of earth-node is relocated, which can lead to changes in the engineering properties of soil. In the frozen soil construction, slope reinforcement, geological disaster management, etc. Changes in the nature of the body. [0003] In the prior art and studies in the field of frozen soil, most of the results in the country are the basic physics and mechanical properties of frozen soil or have been laminated all year round, such as the multi-physical mechanics involved in the soil settling involved in more fried earth regions. Process: The creep of unfrozen soil, the decrease in the upper limit of the frozen soil...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned defects in the prior art, and provide a design optimization method for debris flow prevention and control parameters considering the freeze-thaw cycle effect, aiming at solving the problem that the existing debris flow prevention and control engineering design parameters continue to use rock and soil in non-freeze-thaw areas Conventional physical parameters do not consider the effect of freeze-thaw cycles on the degradation of rock and soil properties, and there is a risk of high parameter values

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