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The relationship between three-dimensional coseismic displacement and distribution of coseismic landslides

Science China Earth Sciences 2023年第7期66卷 1583-1602页

作者： Ru LIU teng wang School of Earth and Space Sciences Peking UniversityBeijing 100871China Hebei Hongshan National Geophysical Observatory for Thick Sediments and Seismic Hazards Peking UniversityBeijing 100871China

In mountainous areas,landslides induced by destructive earthquakes are one of the main causes of human casualties,which is an important link in the chain of earthquake ***-triggered landslides are mainly controlled by three factors,namely seismic property,topography,and *** studies have been conducted on these controlling factors of earthquake-triggered ***,little is known about the effect of coseismic displacement on the distribution of landslides under different slope aspects and slope angles,hindering our understanding of the mechanism of inducing landslides by the combination of surface displacement and slope geometry at the local scale and leading to controversial opinions about the abnormal number of earthquake-triggered landslides in several ***,we took the 2008 Wenchuan M_(w) 7.9 earthquake in China,the 2015 Gorkha M_(w) 7.8 earthquake in Nepal,and the 2016 Kaikōura M_(w) 7.8 earthquake in New Zealand as examples to investigate the relationship between the distribution of large earthquake-triggered landslides and the three-dimensional (3D)coseismic displacement *** divided the landslide-prone area around the epicenter into regular grids and calculated the 3D coseismic displacement in each grid according to the radar satellite images and slip distribution ***,the 3D coseismic displacement was projected to two coordinate systems related to the slope where the landslides were located for statistical *** determined that the surface uplift perpendicular to the slope is more likely to induce landslides,particularly when combined with large slope ***,the number of landslides will be significantly reduced where the subsidence *** of uplift or subsidence,landslides are more likely to occur when the direction of coseismic horizontal displacement is far from the *** larger the slope angles are,the greater the effects of horizontal displacement and slope aspect.A dominant

关键词： Coseismic landslides Three-dimensional coseismic displacement InSAR Landslide risk assessment

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Computational study of bubble coalescence/break-up behaviors and bubble size distribution in a 3-D pressurized bubbling gas-solid fluidized bed of Geldart A particles

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Chinese Journal of Chemical Engineering 2022年第4期35卷 485-496页

作者： teng wang Zihong Xia Caixia Chen Department of Energy and Chemical Engineering East China University of Science and TechnologyShanghai 200237China

A computational study was carried out on bubble dynamic behaviors and bubble size distributions in a pressurized lab-scale gas-solid fluidized bed of Geldart A ***-resolution 3-D numerical simulations were performed using the two-fluid model based on the kinetic theory of granular flow.A finegrid,which is in the range of 3–4 particle diameters,was utilized in order to capture bubble structures explicitly without breaking down the continuum assumption for the solid phase.A novel bubble tracking scheme was developed in combination with a 3-D detection and tracking algorithm(MS3 DATA)and applied to detect the bubble statistics,such as bubble size,location in each time frame and relative position between two adjacent time frames,from numerical *** spatial coordinates and corresponding void fraction data were sampled at 100 Hz for data *** bubble coalescence/break-up frequencies and the daughter bubble size distribution were evaluated by using the new bubble tracking *** results showed that the bubble size distributed non-uniformly over cross-sections in the *** equilibrium bubble diameter due to bubble break-up and coalescence dynamics can be obtained,and the bubble rise velocity follows Davidson’s correlation *** agreements were obtained between the computed results and that predicted by using the bubble break-up model proposed in our previous *** computational bubble tracking method showed the potential of analyzing bubble motions and the coalescence and break-up characteristics based on time series data sets of void fraction maps obtained numerically and experimentally.

关键词： Pressurized gas-solid bubbling fluidized bed Geldart A particles Bubble size distribution Coalescence Break-up Bubble tracking algorithm

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Failure behavior of soil-rock mixture slopes based on centrifuge model test

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Journal of Mountain Science 2019年第8期16卷 1928-1942页

作者： wang teng ZHANG Ga State Key Laboratory of Hydroscience and Engineering Tsinghua University

The stability of soil-rock mixtures(SRMs) that widely distributed in slopes is of significant concern for slope safety evaluation and disaster prevention. The failure behavior of SRM slopes under surface loading conditions was investigated through a series of centrifuge model tests considering various volumetric gravel contents. The displacement field of the slope was determined with image-based displacement system to observe the deformation of the soil and the movement of the block during loading in the tests. The test results showed that the ultimate bearing capacity and the stiffness of SRM slopes increased evidently when the volumetric block content exceeded a threshold value. Moreover, there were more evident slips around the blocks in the SRM slope. The microscopic analysis of the block motion showed that the rotation of the blocks could aggravate the deformation localization to facilitate the development of the slip surface. The high correlation between the rotation of the key blocks and the slope failure indicated that the blocks became the dominant load-bearing medium that influenced the slope failure. The blocks in the sliding body formed a chain to bear the load and change the displacement distribution of the adjacent matrix sand through the block rotation.

关键词： Soil rock mixture Slope stability Slope failure Centrifuge model test

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Experimental Studies on Cyclic Shear Behavior of Steel-Clay Interface Under Constant Normal Load

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China Ocean Engineering 2023年第3期37卷 519-524页

作者： YU Shi-wen wang Jie LIU Jun-wei wang teng School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China China Communications Third Harbor Engineering Co. Ltd.ShanghaiChina School of Civil Engineering Qingdao University of TechnologyQingdao 266520China

The degradation of the shear stress between pile-clay interface caused by undrained cyclic jacking affects the jacking force.A series of large displacement monotonic shear,cyclic shear and post-cyclic monotonic steel plate-clay interface shear te sts were performed under the constant normal load(CNL)condition to inve stigate the effects of normal stre ss,cyclic amplitude,and number of cycles on a steel plate-clay interface using the GDS multi-function interface shear *** on the experimental results,in monotonic shear tests,change of shear stress took place in the specimen,the shear stress rapidly reached the peak value at shear displacement of 1 mm,and then abruptly decreased to the residual *** cyclic shear te sts,accumulated displacement was a better parameter to describe the soil degradation characteristics,and the degradation degree of shear stress became greater with the increasing of normal stress and accumulated *** stress in post-cyclic monotonic shear tests did not generate a peak value and was lower than that in monotonic shear tests under the same normal *** soil was completely disturbed and reached the residual strength when the cumulative displacement approached 6 *** empirical equation to evaluate shear stress degradation mechanism was formulated and the procedure of parameter identification was presented.

关键词： cyclic shear steel-clay interface constant normal load cumulative displacement residual strength

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Remanufacturing Scheme Design for Used Parts Based on Incomplete Information Reconstruction

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Chinese Journal of Mechanical Engineering 2020年第3期33卷 72-85页

作者： Wenhao Huang Zhigang Jiang teng wang Yan wang Xiaoli Hu Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science&TechnologyWuhan 430081China Key Laboratory of Metallurgical Equipment and Control Technology Wuhan University of Science&TechnologyWuhan 430081China Department of Computing Engineering and MathematicsUniversity of BrightonBrighton BN24GJUK School of Mechanical Engineering Shanghai Dianji UniversityShanghai 201306China.

The different conditions of use of a component result in a variety of damage ***,excluding differences in shape and size,used parts show a high degree of uncertainty regarding failure characteristics,quality conditions,and remaining life,which seriously affects the efficiency of a remanufacturing scheme *** to address this problem,a remanufacturing scheme design method based on the reconstruction of incomplete information of used parts is ***,the remaining life of the reconstructed model is predicted by finite element analysis,and the demand for the next life cycle is ***,the scanned 3D damage point cloud data are registered with the original point cloud data using the integral iterative method to construct a missing point cloud model to achieve the restoration of geometric ***,according to reverse engineering and laser cladding remanufacturing,the tool remanufacturing process path can be generated by the tool contact point path section line ***,the proposed method is adopted for turbine blades to evaluate the effectiveness and feasibility of the proposed *** study proposes a remanufacturing scheme design method based on the incomplete reconstruction of used part information to solve the uncertain and highly personalized problems in remanufacturing.

关键词： Remanufacturing Incomplete information Unit-step integration iteration method

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Time-Dependent Tsunami Source Following the 2018 Anak Krakatau Volcano Eruption Inferred from Nearby Tsunami Recordings

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China Ocean Engineering 2021年第1期35卷 145-152页

作者： ZHU Yi-fan AN Chao wang teng LIU Hua Key Laboratory of Hydrodynamics(Ministry of Education) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Earth and Space Sciences Peking UniversityBeijing 100871China

The eruption of the Anak Krakatau volcano,Indonesia,on 22 December 2018 induced a destructive tsunami(the Sunda Strait tsunami),which was recorded by four nearby tidal *** this study we invert the tsunami records and recover the tsunami generation *** tsunami sources are obtained,a static one of instant initial water elevation and a time-dependent one accounting for the continuous evolution of water *** time-dependent results are found to reproduce the tsunami recordings more *** complete tsunami generation process lasts approximately 9 min and features a two-stage evolution with similar *** stage lasts about 3.5 min and elevates a water volume of about 0.13 *** time,duration and volume of the volcano eruption in general agree with seismic records and geomorphological *** also test different sizes of the potential source region,which lead to different maximum wave height in the source area,but all the results of time-dependent tsunami sources show the robust feature of two stages of wave *** results imply a time-dependent and complex process of tsunami generation during the volcano eruption.

关键词： 2018 Anak Krakatau tsunami static tsunami source time-dependent tsunami source tsunami source inversion

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Experimental study on slurry-induced fracturing during shield tunneling

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Frontiers of Structural and Civil Engineering 2021年第2期15卷 333-345页

作者： teng wang Dajun YUAN Dalong JIN Xinggao LI Key Laboratory of Urban Underground Engineering of the Education Ministry Beijing Jiaotong UniversityBeijing100044China

Facial support in slurry shield tunneling is provided by slurry pressure to balance the external earth and water *** fracturing may occur and cause a significant decrease in the support pressure if the slurry pressure exceeds the threshold of the soil or rock material,resulting in a serious face collapse *** the occurrence of hydraulic fracturing in a slurry shield requires investigating the effects of related influencing factors on the hydraulic fracturing pressure and fracture *** this study,a hydraulic fracturing apparatus was developed to test the slurry-induced fracturing of cohesive *** effects of different sample parameters and loading conditions,including types of holes,unconfined compressive strength,slurry viscosity,and axial and circumferential loads,on the fracturing pressure and fracture dip were *** results indicate that the fracture dip is mainly affected by the deviator *** fracturing pressure increases linearly with the increase in the circumferential pressure,but it is almost independent of the axial *** unconfined compressive strength of soil can reflect its ability to resist fracturing *** fracturing pressure increases with an increase in the unconfined compressive strength as well as the slurry *** on the test results,an empirical approach was proposed to estimate the fracturing pressure of the soil.

关键词： slurry shield tunneling hydraulic fracturing test fracturing pressure fracture dip unconfined compressive strength slurry viscosity

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The genetic diversity, individual relatedness and possible mating system of an isolated population of the Cyprinid species Megalobrama pellgrini in upper reaches of the Changjiang (Yangtze) River, China

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Journal of Oceanology and Limnology 2019年第3期37卷 1042-1050页

作者： wang Huanshan wang teng LI Wenjing LIU Huanzhang The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China

Megalobrama pellegrini is a cyprinid fish endemic to upper reaches of the Changjiang(Yangtze)River,China,which is also an important economic species in the local *** recent years,resources of this species have decreased sharply and its conservation has drawn great *** the present study,we collected 120 individuals from the Longxi River,a tributary isolated from the main channel of the Changjiang River,where *** is still relatively *** two different molecular markers,mitochondrial cytochrome b(cyt b)gene,and nuclear microsatellite(simple sequence repeat,SSR),we analyzed the genetic diversity of this isolated *** results show that sequence genetic diversity was low(Hd:0.290 and P i:0.000 77 for cyt b gene),while the SSR genetic diversity was high(Ho:0.824 4±0.147 2,He:0.823 5±0.145 1).Analysis indicated that this population had experienced a bottleneck,with inbreeding and small effective population size(around 50).Based on SSR data,relatedness analyzing revealed that the 120 samples were grouped into 10 completely independent *** was inferred that the mating system of *** was *** suggested that the low genetic diversity could be induced by the overfishing and inbreeding ***,we suggested that the urgent conservation measures should be taken to control the overfi shing and give better conditions for the fish to grow and spawn,then to restore population size.

关键词： isolated population genetic diversity individual relatedness mating system conservation

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Rapid estimation of an earthquake impact area using a spatial logistic growth model based on social media data

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International Journal of Digital Earth 2019年第11期12卷 1265-1284页

作者： Yandong wang Shisi Ruan teng wang Mengling Qiao State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanPeople’s Republic of China Collaborative Innovation Center for Geospatial Information Technology WuhanPeople’s Republic of China

Rapid estimates of impact areas following large earthquakes constitute the cornerstone of emergency response ***,collecting information through traditional practices usually requires a large amount of manpower and material resources,slowing the response *** media has emerged as a source of real-time‘citizen-sensor data’for disasters and can thus contribute to the rapid acquisition of disaster *** paper proposes an approach to quickly estimate the impact area following a large earthquake via social ***,a spatial logistic growth model(SLGM)is proposed to describe the spatial growth of citizen-sensor data influenced by the earthquake impact strength after an earthquake;a framework is then developed to estimate the earthquake impact area by combining social media data and other auxiliary data based on the *** reliability of our approach is demonstrated in two earthquake cases by comparing the detected areas with official intensity maps,and the time sensitivity of the social media data in the SLGM is *** results illustrate that our approach can effectively estimate the earthquake impact *** verify the external validity of our model across other earthquake events and provide further insights into extracting more valuable earthquake information using social media.

关键词： Social media earthquake citizen-sensor data impact area spatial logistic growth model

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AN ANALYTICAL SOLUTION TO LONGITUDINAL VIBRATION OF A PILE OF ARBITRARY SEGMENTS WITH VARIABLE MODULUS

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Acta Mechanica Solida Sinica 2001年第1期14卷 67-73页

作者： wang teng wang Kuihua Xie Kanghe Department of Civil Engineering Zhejiang University Hangzhou 310027 China Department of Civil Engineering Zhejiang University Hangzhou 310027 China Department of Civil Engineering Zhejiang University Hangzhou 310027 China

The vibration problem of a pile of arbitrary segments withvariable modulus modules under ex- citing force is established, inwhich the influence of the soil under pile toe and the surroundingsis tak- en into account. With Laplace transforms, the transmitfunctions for velocity and displacement of pile are ***, in terms of the convolution theorem and inversed Laplacetransform, an analytical solution for the time domain response of apile subjected to semi-sine impulse is developed, which is thetheoretical basis of the sonic method in pile integrity testing. Basedon the solution, the vibration properties of pile with sharp orcontinuous modulus are studied. The validity of this approach isverified through field dynamic tests on some engineering piles. Itshows that the theoretical predic- tion ad the response of the pileare in good agreement.

关键词： pile with variable modulus longitudinal vibration Laplace transforms

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