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RISS 인기검색어
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- 저자 : Tiexin Liu (검색결과 2 건)
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Tiexin Liu,Annan Jiang,Zhenghu Zhang,Huaizhong Liu,Jun Zheng 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
The lengths of intact rock core pieces (LIRCP) and the corresponding rock quality designation(RQD) are two essential indexes for grasping rock structure. However, joints are usuallysimplified to be perfect planes. Thus, the influence of joint roughness on the LIRCP and RQDis not fully considered. The joint roughness was described by the Hurst exponent (H) and theroot-mean-square of the point heights on a joint (Rq) in the study. Theoretical formulas werederived and a new practical method of building non-planar joint disc models was proposed toreveal the influence of joint roughness and to estimate the LIRCP and RQD in the field. A 3Dpoint cloud with the texture of a rock slope was acquired by photogrammetry to verify thepracticability of the new method. Results showed that: a) the LIRCP obeyed a normaldistribution, and the distribution form was mainly controlled by Rq rather than H when therewas one equal spacing parallel joint set; b) Rq and H significantly affected the mean length andthe number of intact rock core pieces and the value of RQD when joints were non-parallel; c)following the rise of Rq, the number of intact rock core pieces and the value of RQD trendedto increase but the mean length of intact rock core pieces displayed a downtrend; however,the effect degree of Rq on the trend decreased as the rise of H; d) the new method of buildingnon-planar joint disc models was applicable to estimate the LIRCP and RQD in engineeringpractices.
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Jichao Guo,Jun Zheng,Qing Lü,Zhipeng Xiao,Tiexin Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.10
Discrete fracture network (DFN) simulation is the basis of studying the properties of a rock mass. An important premise of constructing three-dimensional (3-D) DFNs is to ensure that the fracture intensity (P32) of the simulated rock mass equals to that of the real one. In fact, the natural fracture shapes are various, and we can only obtain one-dimensional (1-D) and two-dimensional (2-D) measurements of a rock mass and usually infer 3-D DFNs based on 1-D and 2-D measurements. The following question would be induced: whether the DFNs with the same P32 and different shapes have similar 2-D trace information. Hence, a series of hypothetical 3-D elliptical DFNs with different values of long-short axis length ratio ke are constructed, and disc models are used to represent them. The algorithms of obtaining traces on sampling windows concerning circular and elliptical fractures are developed. The results show that as the values of ke increase, the error rate of the trace numbers and lengths between the elliptical fractures and simulated disc models on the same sampling windows increases. Moreover, because of the significant impact of fracture shape, the Accuracy representation Index is proposed to better evaluate which model is more appropriate for constructing DFNs.
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