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Method for simulating strength weakening of nearly horizontal weak structural planes of dam foundation

A technology of weak structural surface and strength, applied in hydraulic models and other directions, can solve the problem that the shear strength cannot continue to decrease, and achieve the effect of increasing the strength reduction range, uniform heating, and reducing mechanical parameters.

Active Publication Date: 2019-09-20
SICHUAN UNIV
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Problems solved by technology

[0005] The above-mentioned patent documents simulate the mechanical test of the weak layer through the geological temperature-sensitive material and the temperature control system, but from the temperature change curve, the shear strength of the geological temperature-sensitive material cannot continue to decrease after the temperature exceeds 40°C

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  • Method for simulating strength weakening of nearly horizontal weak structural planes of dam foundation
  • Method for simulating strength weakening of nearly horizontal weak structural planes of dam foundation
  • Method for simulating strength weakening of nearly horizontal weak structural planes of dam foundation

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Embodiment 1

[0041] A method for simulating the strength weakening of a near-horizontal weak structural surface of a dam foundation, comprising the following steps:

[0042] S1. According to the different fault structure planes and weak interlayers, prepare several different similar materials for temperature rise and drop strength. The components of the temperature rise and drop strength similar materials include copper metal foil, grease, polymer material small white balls and films, and the grease is lithium-based lubricating oil. The small white balls of polymer materials are polymer microspheres in ion exchange resins, and the film is wax paper; the preparation method is to first smear a layer of grease on the copper metal foil, and then evenly paste a layer of the above grease on the grease. Small white balls of polymer materials, and finally covering the film, can obtain the similar material of temperature rise and drop strength;

[0043] S2. Carry out a temperature-rising and decrea...

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Abstract

The invention discloses a method for simulating strength weakening of nearly horizontal weak structural planes of a dam foundation. The method comprises the following steps that S1, different temperature-rising and strength-reducing similar materials are prepared; S2, the temperature-rising and strength-reducing similar materials are subjected to a temperature-rising and strength-reducing shear test, and an analytical expression of a temperature-rising and strength-reducing curve of the temperature-rising and strength-reducing similar materials is solved; S3, materials of a geomechanical model are used for simulating the dam foundation, and the temperature-rising and strength-reducing similar materials are used for simulating all the weak structural planes; S4, temperature-rising systems and temperature control systems are arranged in the multiple temperature-rising and strength-reducing similar materials; and S5, the strength-reducing amplitude of the model in different areas is obtained through the difference of temperature rising of the multiple temperature-rising and strength-reducing similar materials. The method realizes the effect of conducting a large-range and high strength-reducing amplitude test.

Description

technical field [0001] The invention relates to the field of geological information acquisition, in particular to a method for simulating the strength weakening of a near-horizontal weak structural surface of a dam foundation. Background technique [0002] There are three kinds of failure test methods in geomechanics model test, namely overload method, strength reduction method (strength reserve method) and comprehensive method. Among them, the comprehensive method combines the overload method and the strength reduction method, which not only takes into account the sudden flood that may be encountered in the project, but also takes into account the mechanical parameters of the rock mass and weak structural surfaces during the long-term operation of the project under the action of reservoir water. Gradually reduce the possibility of obtaining various factors affecting the stability of the dam, so it is more in line with engineering reality. [0003] However, in the model tes...

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Application Information

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IPC IPC(8): E02B1/02
CPCE02B1/02
Inventor 杨宝全陈媛陈建叶董建华张林胡成秋李朝国罗敏刘子安张芮瑜
Owner SICHUAN UNIV
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