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Discontinuity development patterns and the challenges for 3D discrete fracture network modeling on complicated exposed rock surfaces

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2154-2171页

作者： Wen Zhang Ming Wei Ying Zhang Tengyue Li Qing Wang Chen Cao Chun Zhu Zhengwei Li Zhenbang Nie Shuonan Wang Han Yin College of Construction Engineering Jilin UniversityChangchun130026China Liaoning Nonferrous Geological Exploration and Research Institute Co. Shenyang110013China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China Northeastern University Shenyang110819China

Natural slopes usually display complicated exposed rock surfaces that are characterized by complex and substantial terrain undulation and ubiquitous undesirable phenomena such as vegetation cover and *** study presents a systematic outcrop research of fracture pattern variations in a complicated rock slope,and the qualitative and quantitative study of the complex phenomena impact on threedimensional(3D)discrete fracture network(DFN)*** the studies of the outcrop fracture pattern have been so far focused on local variations,thus,we put forward a statistical analysis of global *** entire outcrop is partitioned into several subzones,and the subzone-scale variability of fracture geometric properties is analyzed(including the orientation,the density,and the trace length).The results reveal significant variations in fracture characteristics(such as the concentrative degree,the average orientation,the density,and the trace length)among different ***,the density of fracture sets,which is approximately parallel to the slope surface,exhibits a notably higher value compared to other fracture sets across all *** improve the accuracy of the DFN modeling,the effects of three common phenomena resulting from vegetation and rockfalls are qualitatively analyzed and the corresponding quantitative data processing solutions are ***,the 3D fracture geometric parameters are determined for different areas of the high-steep rock slope in terms of the subzone *** results show significant variations in the same set of 3D fracture parameters across different regions with density differing by up to tenfold and mean trace length exhibiting differences of 3e4 *** study results present precise geological structural information,improve modeling accuracy,and provide practical solutions for addressing complex outcrop issues.

关键词： Complicated exposed rock surfaces Discontinuity characteristic variation Three-dimensional discrete fracture network modeling outcrop study Vegetation cover and rockfalls

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Preliminary identification of earthquake triggered multi-hazard and risk in Pleret Sub-District(Yogyakarta,Indonesia)

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Geo-Spatial Information Science 2021年第2期24卷 256-278,I0006页

作者： Aditya Saputra Christopher Gomez Ioannis Delikostidis Peyman Zawar-Reza Danang Sri Hadmoko Junun Sartohadi Faculty of Geography Universitas Muhammadiyah SurakartaCentral JavaIndonesia Graduate School of Maritime Sciences Laboratory of Volcanic Risks at Sea Kobe UniversityKobeJapan Geography Department School of ScienceUniversity of CanterburyChristchurchNew Zealand Geography Faculty Universitas Gadjah MadaYogyakartaIndonesia Department of Soil Science Faculty of AgricultureUniversitas Gadjah MadaYogyakartaIndonesia

Yogyakarta is one of the large cities in Central Java,located on Java Island,*** city,and the Pleret sub-district,where the study has taken place,is prone to earthquake hazards,because it is close to several seismically active zones,such as the Sunda Megathrust and the active fault known as the Opak *** a devastating earthquake of 2006,the population of the Pleret sub-district has increased ***,the housing demand has increased,and so is the pace of low-cost housing that does not meet earthquake-safety requirements,and furthermore are often located on unstable *** local alluvial material covering a jigsaw of unstable blocks and complex slope is conditions that can amplify the negative impacts of *** this context,this study is aiming to assess the multi-hazards and risks of earthquakes and related secondary hazards such as ground liquefaction,and coseismic *** achieve this,we used geographic information systems and remote sensing methods supplemented with outcrop study and existing seismic data to derive shear-strain *** results have revealed the presence of numerous uncharted active faults with movements visible from imagery and *** that the middle part of the study area has a complex geological structure,indicated by many unchartered faults in the *** this newly mapped blocks combined with shear strain data,we reassessed the collapse probability of buildings that reach level>0.75 near the Opak River,in central Pleret *** the buildings and from population distribution,we could determine that the highest risk was during nighttime as the buildings susceptible to fall are predominantly housing *** secondary hazards follow a slightly different distribution with a concentration of risks in the West.

关键词： Earthquake multi-hazard and risk coseismic landslide outcrop study liquefaction

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