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- 저자 : ( Songfeng Guo ) (검색결과 3 건)
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Classification of Rock Mass Structure and Its Scale Effect
( Shengwen Qi ),( Songfeng Guo ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
As known that many kinds of rock mass classification systems have been presented to classify the rock mass quality, e.g., RMR system, Q system, GSI system. However, only a few of references consider the effect of rock mass structure in the rock mass classification. It is always a difficult task to describe rock mass structure quantitatively. In this paper, a classification scheme for rock mass structure was presented based on Gu et al. (1979) after a thoroughly review. The classification considered the lithology, petrography as well as tectonics; meanwhile the attitude of the bedding plane is stressed in the classification, as a significant indicator for experienced tectonic intensity and also the rock mass stability. The classification divided the rock mass structures into five main types, i.e. magmatite or orthometamorphite structure, sedimentary or parametamorphite structure, tectonite structure, decomposed rock structure and loose structure. Each type contains some subtypes which are depicted in both a qualitative and quantitative way to ease the application. The scale effect of rock mass classification is then discussed considering the size of rock matrixes and discontinuities. The mechanical behaviors of each rock mass structure type are investigated with a number of field cases.
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( Lina Ma ),( Shengwen Qi ),( Songfeng Guo ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
In order to cope with land degradation and create new farmlands for cultivation, a gigantic project “Gully Land Consolidation” was launched on the Hill-Gully Region of Chinese Loess Plateau in 2011. However, as a kind of particular remolded loess, these newly-created and re-filled farmlands suffered more seriously collapsible deformation due to their original soil structure was changed and destroyed. In this study, the south gully region of Yanan were selected as the typical study areas which were conducted from 2013-2018. And we took undisturbed loess samples of two types, ones were the natural loess including Q2 and Q3 loess which were sampled from the beside hillslope, others were the re-filled loess sampled from the newly formed farmlands by reshaping valley. Moreover, a series of consolidated drained compression tests and routine soil tests were carried out both on natural loess (Q2 and Q3) and re-filled loess with different water contents and compactness by Triaxial Compression Apparatus for Unsaturated Soil. Thus, studying the changes of collapsible coefficients and collapsible deformation between natural loess and re-filled loess, and analyzing the effects of water contents and compactness on loess collapsibility. Meanwhile, this study also research on loess microstructural characteristics by conducting the scanning electron microscope (SEM) and micron CT tests. The quantitative relationship between loess microstructure and macroscopic collapsibility characteristics were described, and differences of microstructure and pore between natural loess and re-filled loess were analyzed.
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( Yu Zou ),( Shengwen Qi ),( Songfeng Guo ),( Zhifa Zhan ),( Xiaolin Huang ),( Bowen Zheng ),( Ning Liang ),( Jiaguo Xia ),( Xingxing Li ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Strong earthquakes such as the 2008 Wenchuan earthquake often induced numerous landslides, which resulted in a large number of casualties and property losses. Under a strong earthquake, a rock slope often produced a dynamic progressive failure. Understanding the process of the dynamic progressive failure of the rock slope is of great significance for the prediction and prevention of the co-seismic landslide. Generally, the numerical method is a feasible and economic alternative to solve this problem. However, previous studies presumed the failure surface and area in the numerical model, which cannot reproduce the dynamic progressive failure of the rock slope. In this paper, we applied the Universal Discrete Element method (UDEC) was adopted to quantitatively characterize the dynamic progressive failure process of the Wangjiayan co-seismic landslide triggered by 2008 Wenchan earthquake. Different from previous studies, there exists no presumed failure surface and area was was presumed in the UDEC model. The initiation, coalescence of the local fractures and the formation of the final failure surface were well simulated in a real-time way. Some key factors influencing the dynamic progressive failure of the rock slope were systematically explored. This study provided a new insight to understand the disaster-pregnant mechanism, evolution, and formation of the co-seismic landslide.
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