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Qualitative Analyses of Correlations between Strong Ground Motions of the Three Large Earthquakes and Landslide Distributions

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Journal of Earth Science 2023年第2期34卷 369-380页

作者： yuzhu bai Chong Xu Institute of Geology China Earthquake AdministrationBeijing 100029China National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of ChinaBeijing 100085China

In this work,the correlations between spatial distributions of landslide point density(LPD)and strong ground motions of the three strong earthquakes are qualitatively *** the qualitative relationship between the distribution of LPD and the fault rupture process is also *** strong events are the Lushan,Wenchuan,and Jiuzhaigou *** order to reconstruct the near filed strong ground motions and the fault processes of these earthquakes,the broadband ground simulation method of University of California Santa Barbara(UCSB)and the simplified crustal layer structures are *** show the rationality of the UCSB method,the fault slip distributions of the three earthquakes reconstructed by the kinematic rupture generator model in the UCSB method are compared with those by ***,the validation of the UCSB method for the three earthquakes is also carried according to the validation exercise of the Southern California Earthquake Center(SCEC)Broadband Platform(BBP).Lastly,the fields of peak ground acceleration(PGA)and peak ground velocity(PGV)in three mutually perpendicular directions of the three earthquakes are ***,the landslide distribution length of large LPD values along the fault strike is less than the fault strike ***,the slip modes of earthquake faults affect the distributions of *** the strike slip earthquakes,the distributions of large LPD values relate well to PGA and PGV components of the parallel and normal to the fault *** the reverse slip earthquakes,distributions of LPD relate to ground motion components in all ***,distributions of landslides in near fields of earthquakes are significantly affected by the focus parameters and fault scales.

关键词： Lushan earthquake Wenchuan earthquake Jiuzhaigou earthquake landslide ground motions engineering geology

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Gaussian mixture model based adaptive control for uncertain nonlinear systems with complex state constraints

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Chinese Journal of Aeronautics 2022年第5期35卷 361-373页

作者： yuzhu bai Rong CHEN Yong ZHAO Yi WANG College of Aerospace and Engineering National University of Defense TechnologyChangsha 410073China Nanjing Research Institute of Electronics Technology Nanjing 210000China

This paper addresses an uncertain nonlinear control system problem with complex state constraints and mismatched uncertainties.A novel Gaussian Mixture Model(GMM)based adaptive PID-Nonsingular Terminal Sliding Mode Control(NTSMC)(GMM-adaptive-PID-NTSMC)method is *** is achieved by combining a GMM based adaptive potential function with a novel switching surface of ***,the stability of the closed-loop system is *** main contribution of this paper is that the GMM method is applied to obtain the analytic description of the complex bounded state constraints,ensuring that the states'constraints are not violated with GMM-based adaptive potential *** developed potential function can consider the influence of *** importantly,the GMM-adaptive-PID-NTSMC can be generalized to control a more representative class of uncertain nonlinear systems with constrained states and mismatched *** addition,the proposed controller enhances the robustness,and requires less control cost and reduces the steady state error with respect to the Artificial Potential Function based Nonsingular Terminal Sliding Mode Control(APF-NTSMC),GMM-NTSMC and *** last,numerical simulation is performed to validate the superior performance of the proposed controller.

关键词： Gaussian mixture model Nonlinear systems State constrained Terminal sliding mode control Uncertain

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Extrusion deformation process of ground surface during the Lushan earthquake in China

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Geodesy and Geodynamics 2017年第2期8卷 84-89页

作者： yuzhu bai Key Laboratory of Active Tectonics and Volcano Institute of GeologyChina Earthquake Administration

Based on finite element method, the extrusion deformation process of ground surface during the Lushan earthquake （April 20, 2013） is investigated in this work. In order to construct the finite element model of Lushan earthquake structure, the geophysical layer model of Lushan area, the frictional characteristic of slip-weaken along the fault surface, and the Coulomb failure criterion are considered. Through the computation and the comparison with achievement on the Lushan focal dynamics, our researches indicate that：（1） The most extrusion deformation of ground surface occurred in the initial phase of earthquake procession, i.e., between the fourth and sixth seconds after the earthquake occurred. （2） Between the first and sixth seconds after the earthquake, the extrusion deformation concentrates on the surface projection of earthquake fault. （3） Between the first and third seconds after the earthquake, the extrusion deformation of ground surface is very tiny. Meanwhile, the extrusion deformation reaches maximum at the sixth second after earthquake. （4） After 6 s of Lushan earthquake, the extrusion deformation spread out of earthquake structure projection. （5） During the earthquake, the maximum of extrusion deformation on ground surface is larger than the final deformation of the post-earthquake, in other words, the ground extrusion deformation will lastly reach a relatively small value after the Lushan earthquake occurred.

关键词： Lushan earthquake Extrusion deformation Finite element method

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Spacecraft formation reconfiguration with multi-obstacle avoidance under navigation and control uncertainties using adaptive artificial potential function method

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Astrodynamics 2020年第1期4卷 41-56页

作者： Yi Wang Xiaoqian Chen Dechao Ran Yong Zhao Yang Chen yuzhu bai College of Aerospace Science and Engineering National University of Defense TechnologyChangsha410073China National Innovation Institute of Defense Technology Chinese Academy of Military SciencesBeijing10071China

In this paper,an adaptive artificial potential function(AAPF)method is developed for spacecraft formation reconfiguration with multi-obstacle avoidance under navigation and control ***,an improved Linear Quadratic Regular(ILQR)is proposed to track the reference trajectory and a Lyapunov-based method is employed to demonstrate the stability of the overall closed-loop *** with the traditional APF method and the equal-collision-probability surface(ECPS)method,the AAPF method not only retains the advantages of APF method and ECPS method,such as low computational complexity,simple analytical control law and easy analytical validation progress,but also proposes a new APF to solve multi-obstacle avoidance problem considering the influence of the ***,the ILQR controller obtains high control accuracy to enhance the safe performance of the spacecraft formation ***,the effectiveness of the proposed AAPF method and the ILQR controller are verified by numerical simulations.

关键词： spacecraft formation flying spacecraft formation reconfiguration collision avoidance artificial potential function uncertainties

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Study on asymmetric interior corner flow in microgravity condition

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Science China(Technological Sciences) 2012年第8期55卷 2332-2337页

作者： LI JingHao CHEN XiaoQian HUANG YiYong bai yuzhu College of Aerospace and Materials Engineering National University of Defense TechnologyChangsha 410073China Subunit 91 Unit 91550 of People's Liberation ArmyDalian 116000China

The capillary flow in asymmetric interior corner consisting of straight vane and curved wall is studied with analytical *** concept of equivalent interior corner angle is proposed to convert the asymmetric interior corner model into symmetric interior corner *** the governing equations of interior corner flow are established,and based on which the interior corner flow is *** method is used to analyze the capillary flow in cylindrical vane-type surface tension tank with outer *** research can provide beneficial reference to the design of vane-type surface tension tank.

关键词： asymmetric interior corner flow equivalent interior corner angle vane-type surface tension tank analytical solution

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Adaptive Non-singular Terminal Fault-tolerant Control for Rigid Spacecraft Attitude Maneuver 36

Adaptive Non-singular Terminal Fault-tolerant Control for Ri...

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第36届中国控制会议

作者： Dechao Ran Tao Sheng Yi Wang Xiaoqian Chen Ziyan Pang yuzhu bai College of Aerospace Science and Engineering National University of Defense Technology College of Basic Education for Commanding Officers National University of Defense Technology

ISBN: (纸本)9781538629185

In this paper,an adaptive non-singular terminal fault-tolerant controller has been designed for rigid spacecraft attitude *** proposed controller is based on the sliding mode *** adaptive learning algorithm is applied for the estimation of the *** non-singular terminal sliding surface is introduced to guarantee the system states converge to the desired states in finite *** simulation results state that the proposed fault tolerant controller is successful in achieving high control precision with finite time convergence.

关键词： attitude maneuver non-singular terminal sliding fault tolerant adaptive control actuator failure

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Spatial Distribution of Seismic Landslides in the Areas of 1927 Gulang M8.0 Earthquake

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Earthquake Research in China 2020年第1期34卷 5-28页

作者： XU Jixiang XU Chong HE Xiangli WEN Boyu GE Keshui bai yuzhu Key Laboratory of Active Tectonics and Volcano Institute of GeologyChina Earthquake AdministrationBeijing 100029China School of Engineering and Technology China University Of Geosciences(Beijing)Beijing 100083China Institute of Crustal Dynamics China Earthquake AdministrationBeijing 100085China

The 1927 Gulang M8.0 earthquake has triggered a huge number of landslides,resulting in massive loss of people’s life and ***,integrated investigations and results regarding the landslides triggered by this earthquake are rare;such situation hinders the deep understanding of these landslides such as scale,extent,and *** the support of Google Earth software,this study intends to finish the seismic landslides interpretation work in the areas of Gulang earthquake(VIII-XI degree)using the artificial visual interpretation method,and further analyze the spatial distribution and impact factors of these *** results show that the earthquake has triggered at least 936 landslides in the VIII-XI degree zone,with a total landslide area of 58.6 km^*** dense area of seismic landslides is located in the middle and southern parts of the X intensity *** analysis shows that seismic landslides is mainly controlled by factors such as elevation,slope gradient,slope direction,strata,seismic intensity,faults and *** elevation of 2000-2800 m is the high-incidence interval of the *** landslide density is larger with a higher slope *** and west directions are the dominant sliding *** areas with Cretaceous and Quaternary strata are the main areas of the Gulang seismic *** X intensity zone triggered the most *** addition,landslides often occur in regions near rivers and *** paper provides a scientific reference for exploring the development regularities of landslides triggered by the 1927 Gulang earthquake and effectively mitigating the landslide disasters of the earthquake.

关键词： Gulang earthquake Landslide Google Earth Artificial visual interpretation Spatial distribution

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Apply of Explicit Finite Element in Seismic Ground Motion Computation

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Journal of Applied Mathematics and Physics 2013年第6期1卷 11-14页

作者： yuzhu bai Xiwei Xu Active Tectonics and Volcano Lab Key Lab of China Earthquake Administration Beijing China

In this paper, we will use the explicit finite element to compute ground motion due to Tangshan earthquake. The explicit finite-element method uses one integration point and an hourglass control scheme. We implement the coarse-grain method in a structured finite-element mesh straightforwardly. At the same time, we also apply the coarse-grain method to a widely used, slightly unstructured finite-element mesh, where unstructured finite elements are only used in the vertical velocity transition zones. By the finite-element methods, we can compute the ground velocity with some distance to the seismogenic fault in Tangshan earthquake. Through the computation, we can find the main character of ground motion for the strike slip earthquake events and the high frequency vibration motion of ground motion.

关键词： Finite-Element Method Fault Ground Motion Tangshan Earthquake

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Simulations of Vertical and Horizontal Displacement Fields in the 2008 Wenchuan Earthquake

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Earthquake Research in China 2010年第3期24卷 281-291页

作者： bai yuzhu Xu Jie Zhou Bengang Institute of Geology China Earthquake Administration Beijing 100029 China

By using the Yoshimitsu Okada and Steketee fault dislocation model,we calculated the vertical and horizontal displacements along the Yingxiu-Beichuan inverse fault and Guanxian-Anxian inverse fault along which the Wenchuan MS8. 0 earthquake occurred in 2008. Compared to the achievements of field surveying along the surface rupture zone,we found that our computational results are comparable to the real displacement variation trend. Furthermore,the computational results indicated that the surface displacement fields vary with the distance from the fault,and the vertical displacement fields show strong inhomogeneity,in which larger displacement is focused on the ends of the fault. However, in contrast to the vertical displacement,the horizontal displacement shows relative uniformity in space.

关键词： Dislocation model Fault Displacement

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The Preliminary Research on Rupture and Factors Affecting Rupturing of the Hoh Sai Hu Segment in Eastern Kunlun

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Earthquake Research in China 2012年第4期26卷 444-456页

作者： bai yuzhu Xu Jie Zhou Qing Zhou Bengang Key Laboratory of Active Tectonics and Volcano Institute of Geology CEA

On November 14, 2001, an extraordinarily large earthquake (MS8.1) occurred on the Hoh Sai Hu segment of the Eastern Kunlun Fault, in the northern Qinghai-Tibetan Plateau. The seismogenic fault, the Hoh Sai Hu segment, is a left-lateral fault with a high slip rate in geological history, with the average slip rate reaching(14.8±2.8)mm/a since the late Pleistocene. Different slip rates of the Hoh Sai Hu segment can affect fault motion in the future. Therefore, this paper analyzes the effect of different slip rates and different initial friction coefficients on the fault plane of the Hoh Sai Hu segment of the eastern Kunlun Fault on the rupture behaviors of the fault. In this research, we apply the single degree of spring block model controlled by the rateand state-dependent frictional constitutive laws. Using the fault dislocation model and based on ancient earthquake research, historical earthquakes data and the achievements of previous researchers, we obtained the parameters of this model. Through numerical simulation of the rupturing motion of the Hoh Sai Hu segment in the next 6500 years under different slip rates, we find that a faster annual slip rate will shorten the recurrence interval of the earthquake. For example, the earthquake recurrence interval is 2100a at a slip rate of 0.014m/a, which agrees with previous research, but, the recurrence interval will be 1000~1500a and 2100～2500a, corresponding to the slip rates of 0.018m/a and 0.008m/a, respectively. The fault slip rate has no regular effect on the coseismic slip rate and fault displacement in an earthquake. The initial friction coefficient on the fault surface has an effect on the earthquake recurrence interval. A smaller initial friction coefficient will lengthen the earthquake recurrence interval. At the same time, the smaller initial friction coefficient will lead to larger slip rates and fault displacement when earthquakes occur.

关键词： Fault Spring-block model Rupture behavior Earthquake recurrenceinterval

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