Method for quantitatively describing change laws of variances of rockfill material frictional angles along with confining pressure
A quantitative description and change rule technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as not considering the friction angle of rockfill materials
Active Publication Date: 2018-08-31
SICHUAN UNIV
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Problems solved by technology
Neither the current codes nor engineering practices consider the characteristics of the variance of the friction angle of rockfill materials changing with the confining pressure, and the spatial variability of the material strength associated with it
Method used
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Embodiment
[0040] A method for quantitatively describing the variation of the variance of the friction angle of rockfill materials with the confining pressure, comprising the following steps:
[0041] Step 1: Adopt figure 1 The indicated rockfill material (granite blasting material from a hydropower station stockyard) was prepared as a sample, and a large-scale triaxial compression test was carried out under the condition of consolidation and drainage, and the peak friction angle of each sample was measured (hereinafter referred to as friction angle).
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The invention discloses a method for quantitatively describing change laws of variances of rockfill material frictional angles along with confining pressure. The method comprises the following steps of: (1) extracting samples from a rockfill material, and carrying out a tri-axial compression test under a consolidated drainage condition so as to obtain a peak frictional angle (as shown in the specification) of each sample; (2) after frictional angles (as shown in the specification) of the samples under each level of confining pressure are tested, calculating a variance under each level of confining pressure (as shown in the specification); (3) describing laws that the variances of the rockfill material frictional angles change along with the confining pressure; and (4) determining coefficients a, b, c and d through a nonlinear regression method according to the variance under each level of confining pressure (as shown in the specification), so as to obtain a mathematic expression describing change laws of the variances of the rockfill material frictional angles along with the confining pressure. According to the method, variances of rockfill material frictional angles are used for measuring degrees of variability and uncertainty, so that the method can be used for analyzing the anti-sliding stability and reliability of rockfill buildings, and analyzing stability conditions of the rockfill buildings more scientifically and reasonably.
Description
technical field [0001] The invention belongs to the engineering construction field of rock-fill buildings, and in particular relates to a method for quantitatively describing the variance of the friction angle of rock-fill materials with confining pressure. Background technique [0002] Rockfill material is one of the construction materials commonly used in water conservancy, construction, highway and other projects. It is a granular material composed of non-cohesive soil particles of different particle sizes. It is usually fresh rock fragments or cave excavated by blasting in the stockyard. The gravel is mixed according to a certain gradation. The shear strength of rockfill materials is generally characterized by the peak friction angle (hereinafter referred to as friction angle). The test shows that the friction angle of rockfill materials has obvious dependence on confining pressure, that is, the friction angle of rockfill materials decreases with the increase of confini...
Claims
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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 吴震宇陈建康李艳玲张瀚裴亮
Owner SICHUAN UNIV