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Predicting impact forces on pipelines from deep-sea fluidized slides:A comprehensive review of key factors

International Journal of Mining Science and technology 2024年第2期34卷 211-225页

作者： Xingsen Guo Ning Fan Defeng Zheng Cuiwei Fu Hao Wu Yanjun Zhang Xiaolong Song Tingkai Nian State key laboratory of Coastal and Offshore engineering Dalian University of TechnologyDalian 116024China Department of Civil Environmentaland Geomatic EngineeringUniversity College LondonLondon WC1E 6BTUnited Kingdom Shandong Provincial key laboratory of Marine Environment and Geological engineering Ocean University of ChinaQingdao 266100China State key laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China College of Civil engineering and Architecture Wenzhou UniversityWenzhou 325035China key laboratory of engineering and technology for soft soil foundation and tideland reclamation of zhejiang province Wenzhou 325035China zhejiang International Science and technology Cooperation Base of Ultra-soft soil engineering and Smart Monitoring Wenzhou 325035China School of Geography Liaoning Normal UniversityDalian 116029China China Railway First Survey and Design Institute Group Co. Ltd.Xi’an 710043China Department of Geotechnical engineering Nanjing Hydraulic Research InstituteNanjing 210024China Wuhan Center China Geological Survey(Central South China Innovation Center for Geosciences)Wuhan 430205China State key laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China

Deep-sea pipelines play a pivotal role in seabed mineral resource development,global energy and resource supply provision,network communication,and environmental protection.However,the placement of these pipelines on the seabed surface exposes them to potential risks arising from the complex deep-sea hydrodynamic and geological environment,particularly submarine slides.Historical incidents have highlighted the substantial damage to pipelines due to slides.Specifically,deep-sea fluidized slides(in a debris/mud flow or turbidity current physical state),characterized by high speed,pose a significant threat.Accurately assessing the impact forces exerted on pipelines by fluidized submarine slides is crucial for ensuring pipeline safety.This study aimed to provide a comprehensive overview of recent advancements in understanding pipeline impact forces caused by fluidized deep-sea slides,thereby identifying key factors and corresponding mechanisms that influence pipeline impact forces.These factors include the velocity,density,and shear behavior of deep-sea fluidized slides,as well as the geometry,stiffness,self-weight,and mechanical model of pipelines.Additionally,the interface contact conditions and spatial relations were examined within the context of deep-sea slides and their interactions with pipelines.Building upon a thorough review of these achievements,future directions were proposed for assessing and characterizing the key factors affecting slide impact loading on pipelines.A comprehensive understanding of these results is essential for the sustainable development of deep-sea pipeline projects associated with seabed resource development and the implementation of disaster prevention measures.

关键词： Deep-sea fluidized slides Pipes Impact forces Shear behavior of slides Interface contact conditions Spatial relation

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Dynamic prediction of landslide life expectancy using ensemble system incorporating classical prediction models and machine learning

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Geoscience Frontiers 2024年第2期15卷 202-219页

作者： Lei-Lei Liu Hao-Dong Yin Ting Xiao Lei Huang Yung-Ming Cheng key laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China College of Civil engineering and Architecture Wenzhou UniversityWenzhou 325035China key laboratory of engineering and technology for soft soil foundation and tideland reclamation of zhejiang province Wenzhou 325035China Wenzhou key laboratory of Traffic Piezoelectric engineering technology Wenzhou 325035China zhejiang International Science and technology Cooperation Base of Ultra-soft soil engineering and Smart Monitoring Wenzhou 325035China School of Civil engineering Qingdao University of TechnologyQingdao 266033China

With the development of landslide monitoring system,many attempts have been made to predict landslide failure-time utilizing monitoring data of displacements.Classical models(e.g.,Verhulst,GM(1,1),and Saito models)that consider the characteristics of landslide displacement to determine the failuretime have been investigated extensively.In practice,monitoring is continuously implemented with monitoring data-set updated,meaning that the predicted landslide life expectancy(i.e.,the lag between the predicted failure-time and time node at each instant of conducting the prediction)should be re-evaluated with time.This manner is termed“dynamic prediction”.However,the performances of the classical models have not been discussed in the context of the dynamic prediction yet.In this study,such performances are investigated firstly,and disadvantages of the classical models are then reported,incorporating the monitoring data from four real landslides.Subsequently,a more qualified ensemble model is proposed,where the individual classical models are integrated by machine learning(ML)-based meta-model.To evaluate the quality of the models under the dynamic prediction,a novel indicator termed“discredit index(b)”is proposed,and a higher value of b indicates lower prediction quality.It is found that Verhulst and Saito models would produce predicted results with significantly higher b,while GM(1,1)model would indicate results with the highest mean absolute error.Meanwhile,the ensemble models are found to be more accurate and qualified than the classical models.Here,the performance of decision tree regression-based ensemble model is the best among the various ML-based ensemble models.

关键词： Dynamic prediction Landslide life expectancy Machine learning Ensemble system

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Deep seabed mining:Frontiers in engineering geology and environment

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International Journal of Coal Science & technology 2023年第2期10卷 1-31页

作者： Xingsen Guo Ning Fan Yihan Liu Xiaolei Liu Zekun Wang Xiaotian Xie Yonggang Jia Shandong Provincial key laboratory of Marine Environment and Geological engineering Ocean University of ChinaQingdao 266100China Department of Civil Environmentaland Geomatic EngineeringUniversity College LondonLondon WC1E 6BTUK College of Civil engineering and Architecture Wenzhou UniversityWenzhou 325035China key laboratory of engineering and technology for soft soil foundation and tideland reclamation of zhejiang province Wenzhou UniversityWenzhou 325035China laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China

Ocean mining activities have been ongoing for nearly 70 years,making great contributions to industrialization.Given the increasing demand for energy,along with the restructuring of the energy supply catalyzed by efforts to achieve a low-carbon economy,deep seabed mining will play an important role in addressing energy-and resource-related problems in the future.However,deep seabed mining remains in the exploratory stage,with many challenges presented by the high-pressure,low-temperature,and complex geologic and hydrodynamic environments in deep-sea mining areas,which are inaccessible to human activities.Thus,considerable efforts are required to ensure sustainable,economic,reliable,and safe deep seabed mining.This study reviews the latest advances in marine engineering geology and the environment related to deep-sea min-ing activities,presents a bibliometric analysis of the development of ocean mineral resources since the 1950s,summarizes the development,theory,and issues related to techniques for the three stages of ocean mining(i.e.,exploration,extraction,and closure),and discusses the engineering geology environment,geological disasters,in-situ monitoring techniques,envi-ronmental protection requirements,and environmental effects in detail.Finally,this paper gives some key conclusions and future perspectives to provide insights for subsequent studies and commercial mining operations.

关键词： Deep seabed mining Marine engineering geology Geological disasters Environment Techniques

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