A Representative Sampling Method for Structural Surface Samples of Small-scale Rock Models Based on Hierarchical Probability Sampling
A technology of rock model and model structure, which is applied in the field of representative sampling of small-scale rock model structure surface samples, can solve the problems of low test statistical accuracy and failure to meet rock model structure surfaces, etc., to reduce the number, reduce the cost of samples and The effect of the test cycle
Active Publication Date: 2016-01-06
SHAOXING UNIVERSITY
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[0004] In order to overcome the shortcomings of the existing small-scale rock model discontinuity surface sample sampling method, the inability to meet the statistical accuracy requirements of the shear strength of the rock model discontinuity surface, and the statistical precision of the test are low, the present invention provides a method that can effectively meet the requirements of the rock model discontinuity surface. Statistical accuracy requirements for shear strength and size effects of model discontinuity planes, representative sampling method for small-scale rock model discontinuity plane samples based on stratified probability sampling to improve test statistical accuracy
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[0015] The present invention will be further described below in conjunction with the accompanying drawings.
[0016] refer to Figure 1 ~ Figure 3 , a representative sampling method for structural plane samples of small-scale rock models based on stratified probability sampling, including the following steps:
[0017] (1) Calibrate the test direction on the sample of the original rock structural surface, and according to the calibrated direction, perform directional statistical measurement of the undulation amplitude of the original rock structural surface sample, and obtain the undulation amplitude of each measurement section of the small scale R y , by the formula Calculate the roughness coefficient characteristic value JRC and the statistical mean value of each measuring section of the scale respectively In the formula, R y is the undulation amplitude of the surface profile curve, JRC n and D n is the sampling length L n The roughness coefficient and fractal dimens...
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Abstract
A method for representatively sampling a subsize rock model structural surface sample sampled based on layering probability comprises the following steps of: (1) orientationally counting and measuring fluctuation amplitude of a raw rock structural surface sample, respectively calculating a roughness coefficient characteristic constant JRC and a statistic average value of each measuring segment of the scale by a formula; (2) calculating based on quartile division to obtained JRC average values and variances of three intervals: P0-25, P25-75 and P75-100; and (3) setting a relative permissible error of an average value of samples and an ensemble average value to be gamma, and setting confidence to be 95%. The said calculated data is substituted into a layeredly sampling formula to obtain a total sample size, and the sample size of each layer is determined based on the layer weight: W0-25=1 / 4, W25-75=1 / 2 and W75-100=1 / 4. The method provided by the invention can effectively satisfy statistic precision requirement of the shear strength dimension effect of the rock model structural surface, and can raise test statistic precision.
Description
technical field [0001] The invention relates to the field of the size effect of the shear strength of rock mass structural planes, in particular to a representative sampling method for structural plane samples of small-sized rock models. Background technique [0002] The shear strength of the structural plane of rock mass has the characteristic of size effect. In order to obtain the size effect law of the shear strength of the structural plane of rock mass, it is necessary to conduct direct shear tests on the shear strength of structural planes of different sizes. However, due to the characteristics of the direct shear test of structural surfaces, only one destructive test can be carried out on an original rock structural surface. In order to statistically analyze the size effect of structural surface shear strength, model samples of rock structural surfaces of different sizes need to be manually produced. The characteristic of making series size model specimens is that the ...
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IPC IPC(8): G01N3/24
Inventor 黄曼杜时贵罗战友
Owner SHAOXING UNIVERSITY