基于CT探测技术的不良地质构造三维网格模型重构方法

doi:10.13722/j.cnki.jrme.2018.1232

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Abstract The stability of rock and soil under unfavorable geological conditions has attracted wide attention in underground space engineering. A 3D mesh model reconstruction method of unfavorable geological structure based on CT detection technology was proposed to establish a reliable analysis model for evaluating the stability of rock and mass. In this method，a 3D visualization model of the elastic-wave velocity was obtained by performing numerical simulation of elastic-wave CT detection and block Kriging interpolation. The peak value formula is used for material threshold segmentation，and the 3D mesh construction and material property mapping are used to form a 3D grid model in the target region. Comparison between the reconstructed 3D grid model and the original model shows that the simulation degree of the reconstructed model is as high as 91.44% and the absolute error of the volume fraction is 3.33%. Field test of elastic-wave CT detection was carried out for the bridge foundation location area，and the 3D mesh model of the region was reconstructed and verified by coring. The simulation degree is greater than 84.31%，and the absolute error of the volume fraction is less than 2.45%. The method has high modeling accuracy and can accurately reflect the spatial distribution state of bad geological bodies，and hence，has important scientific significance for evaluating the stability of poor geological structure.

Key words： geotechnical engineering unfavorable geology elastic wave CT 3D element mesh model reconstruction method simulation

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	WANG Qiming
	CHE Ailan

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WANG Qiming,CHE Ailan. A 3D element mesh model reconstruction method for unfavorable#br# geological structure based on CT technology[J]. , 2019, 38(6): 1222-1232.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1232 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I6/1222

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