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Insight into the Permeability and Microstructure Evolution Mechanism of the Sliding Zone Soil: A Case Study from the Huangtupo Landslide, Three Gorges Reservoir, China

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Journal of Earth Science 2024年第3期35卷 941-954页

作者： Qianyun Wang Huiming Tang Pengju An Kun Fang Junrong Zhang minghao miao Qingwen Tan Lei Huang Shengming Hu Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China Faculty of Engineering China University of GeosciencesWuhan 430074China Institute of Rock Mechanics Ningbo UniversityNingbo 315211China National and Provincial Joint Engineering Laboratory for the Hydraulic Engineering Safety and Efficient Utilization of Water Resources of Poyang Lake Basin Nanchang Institute of TechnologyNanchang 330099China

A large number of laboratory investigations related to the permeability have been conducted on the sliding *** little attention has been paid to the particular sliding zones of the slideprone Badong ***,we experimentally investigate the permeability nature and the mechanism of seepage in the viscous sliding zone of the Huangtupo *** seepage tests have been performed first with consideration of six dry densities and thirteen hydraulic gradients,in conjunction with the mercury intrusion porosimetry test and scanning electron microscopy test for the microstructure analysis after *** results show that seepage in the sliding zone soil does not follow Darcy’s Law,since there is a threshold hydraulic gradient(i0)below which no flow is observed and a critical hydraulic gradient(icr)over which the hydraulic conductivity(K)tends to be *** percentage of bound water could be responsible for the occurrence of i0 and ***,pore size distributions(PSD)less than 0.6µm and between 10 and 90µm exhibit positive and negative correlations with the i0,respectively,indicating that the i0 is related to the *** mechanism accounting for this result is that pore water pressure forces fine clay particles into the surrounding large pores and converts arranged particles to discretely distributed ones,thereby weakening the connectivity of *** seepages in the sliding zones behave differently from that in the sliding mass and sliding bed in response to the permeability.

关键词： reservoir landslides sliding zone soil permeability microstructure seepage.

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Formation of the Soil Arch and Load Transfer Mechanism of a Slope due to Excavation by 3D Particle Flow Code Simulation

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Journal of Earth Science 2023年

作者： Chunyan Tang Huiming Tang Kun Fang Xuexue Su Sixuan Sun minghao miao Badong National Observation and Research Station of Geohazards China University of Geosciences Faculty of Engineering China University of Geosciences

The soil arching effect is an important factor affecting the internal load transfer of excavation-induced slopes. Physical model tests are usually used for studying the soil arching effect. Although physical model tests can monitor local point loads to demonstrate changes in local stresses,changes in force chains inside slopes are rarely demonstrated by physical modelling, which restricts the understanding of load transfer. To explore overall changes in stresses in slopes from a more microscopic perspective, a numerical simulation of the slope under excavation was carried out. Using built-in code and fish function programming in PFC3D, the slope model was developed. Monitoring areas were set up to monitor the changes in stresses and force chains during excavation. The simulation results show that excavation width affects the size of deformation area, and the deformation area expands as excavation width increases. Excavation causes load transfer and the formation of soil arching in the slope. A mechanism is proposed to explain the effect of excavation on soil arching formation and load transfer. The numerical simulation is important for revealing the load transfer of slopes during excavation, and the research results have practical value for the prevention and mitigation of landslides caused by excavation.

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Development of a Model Material Suitable for Reservoir Landslide Model Tests

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Journal of Earth Science 2023年

作者： minghao miao Huiming Tang Sha Lu Changdong Li Kun Fang Yixiao Gu Chunyan Tang Faculty of Engineering China University of Geosciences Badong National Observation and Research Station of Geohazards China University of Geosciences

In the physical model test of landslides, the selection of analogous materials is the key,anditisdifficulttoconsiderthesimilarityofmechanicalpropertiesandseepageperformanceatthe same time. To develop a model material suitable for analysing the deformation and failure of reservoir landslides, based on the existing research foundation of analogous materials, 5 materials and 5 physicalmechanical parameters were selected to design an orthogonal test. The factor sensitivity of each component ratio and its influence on the physical-mechanical indices were studied by range analysis and stepwiseregressionanalysis,***,themodelmaterial was developed, and a model test was carried out considering Huangtupo as the prototype *** results showed that (1) the model material composed of sand, barite powder, glass beads, clay, and bentonite had a wide distribution of physical-mechanical parameters, which could be applied to model testsunderdifferentconditions;(2)thephysical-mechanicalparametersofanalogousmaterials matched the application prototype; and (3) the mechanical properties and seepage performance of the model material sample met the requirements of reservoir landslide model tests, which could be used to simulate landslide evolution and analyse the deformation process.

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Dynamic Setting Method of Assessment Indicators for Power Curves of Renewable Energy Sources Considering Scarcity of Reserve Resources

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 101-114页

作者： minghao Cao Jilai Yu the Department of Electrical Engineering Harbin Institute of TechnologyHarbinChina

With the increasing proportion of renewable energy sources(RESs)in power grid,the reserve resource(RR)scarcity for correcting power deviation of RESs has become a potential ***,the power curve of RES needs to be more rigorously *** RR scarcity varies during different time periods,so the values of assessment indicators should be dynamically *** assessment indicators in this paper include two aspects,i.e.,deviation exemption ratio and penalty ***,this paper proposes a method for dynamically calculating the supply capacity and RR cost,primarily taking into account the operating status of thermal units,forecast information of RES,and load ***,after clarifying the logical relationship between the degree of RR scarcity and the values of assessment indicators,this paper establishes a mapping function between *** on this mapping function,a dynamic setting method for assessment indicators is *** the future,RES will generally be equipped with battery energy storage systems(BESSs).Reasonably utilizing BESSs to reduce the power deviation of RESs can increase the expected income of ***,this paper proposes a power curve optimization strategy for RESs considering self-owned *** case study demonstrates that the dynamic setting method of assessment indicators can increase the revenue of RESs while ensuring that the penalty fees paid by RESs to the grid are sufficient to cover the RR ***,the power curve optimization strategy can help RESs further increase income and fully utilize BESSs to reduce power deviation.

关键词： Renewable energy battery energy storage system(BESS) power curve assessment reserve service parameter setting

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Recent progress in all-inorganic tin-based perovskite solar cells:a review

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Science China Chemistry 2024年第4期67卷 1117-1136页

作者： minghao Wang Yu Shi School of Electronics and Information Engineering Wuxi UniversityWuxi 214105China Institute of Advanced Materials Nanjing Tech UniversityNanjing 211816China

Recently,power conversion efficiency(PCE)of organic-inorganic hybrid perovskite solar cells(PSCs)has been improved to26.1%.However,the toxicity issue of lead still hinders the large-scale commercial production and application of lead(Pb)-based halide ***,environmentally friendly tin(Sn)-based perovskites have recently shown excellent *** them,the all-inorganic Sn-based perovskites,including CsSnX_(3) and Cs_(2)SnX_(6),have better stability,more suitable bandgap,and higher charge mobility,which have attracted more attention from researchers than organic-inorganic Sn-based hybrid ***,we review recent research progress on all-inorganic Sn-based perovskite materials and corresponding solar cell ***,we also summarize the current challenges and future research directions for this type of PSCs.

关键词： solar cells perovskite all-inorganic CsSnX_(3) Cs_(2)SnX_(6)

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Single-atom catalysts for neutral zinc-air batteries

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Science China Materials 2024年第5期67卷 1674-1675页

作者： Jiaxu Zhang minghao Yu Faculty of Chemistry and Food Chemistry&Center for Advancing Electronics Dresden(CfAED) Technische Universität DresdenDresden01062Germany

The escalating global energy demand underscores the urgency of developing sustainable battery ***-air batteries(ZABs)have emerged as promising candidates due to their costeffectiveness,safety,and high energy density[1-4].Conventional ZABs typically rely on a four-electron(4e-)oxygen reduction reaction(ORR)in strongly alkaline electrolytes.

关键词： battery neutral typically

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Piezoelectric sensing method for segmental joint contact stress during shield tunnel construction

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Underground Space 2024年第4期17卷 82-99页

作者： Guodong Jiang minghao Dai Guozhu Zhang Limin Gao Institute of Geotechnical Engineering Southeast UniversityNanjing 211189China Nanjing Metro Group Co.Ltd Nanjing 210000China No.4 Construction Company of China Petroleum Pipeline Engineering Co.Ltd Langfang 065000China

The emergence of curved shield tunnels poses a significant construction *** the quality of the segment assembly is not guaranteed,many segment cracks and damage will result from the stress *** the contact stresses between segmental joints is necessary to improve the quality of segments assembled for shield tunnel *** difluoride(PVDF)piezoelectric material was chosen for the sensor because it can convert contact stresses into electrical signals,allowing the state of the segmental joints to be effectively *** matches the working environment between the segmental joints of the shield tunnel,where flexible structures such as rubber gaskets and force transfer pads are *** study proposes a piezoelectric sensing method for segmental joints in shield tunnels and conducts laboratory tests,numerical analyses,and field tests to validate the feasibility of the *** results indicate that the PVDF film sensor can effectively sense the entire compression process of the gasket with different amounts of *** piezoelectric cable sensor can effectively sense the joint offset direction of the *** differently shaped sections,the variation in the force sensed by the piezoelectric cable sensors was different,as verified by numerical *** the field test,it was found that the average contact stress between the segmental joints was in the range of 1.2–1.8 MPa during construction of the curved shield *** location of the segmental joints and the type of segment affect the contact stress *** field monitoring results show that piezoelectric sensing technology can be successfully applied during assembly of the segments for effective sensing of the contact stress.

关键词： Shield tunnel Segmental joint Contact stress Piezoelectric sensor

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A New Random Sampling Method and Its Application in Improving Progressive BKZ Algorithm

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Journal of Systems Science & Complexity 2024年第5期37卷 2262-2292页

作者： SUN minghao WANG Shixiong CHEN Hao QU Longjiang College of Sciences National University of Defense TechnologyChangsha 410073China Academy of Military Sciences Beijing 100091China College of Information Science and Technology/Cyber Security Jinan UniversityGuangzhou 510632China

Random sampling algorithm was proposed firstly by Schnorr in 2003 to find short lattice vectors,as an alternative to *** follow-up developments in random sampling were mainly proposed by Fukase and Kashiwabara in 2015 and Aono and Nguyen in *** they extended the sampling space compared to Schnorr's work through the natural number representation,they did not show how to sample specifically in practice and what vectors should be sampled,in order to find short enough lattice *** this paper,the authors firstly introduce a practical random sampling algorithm under some reasonable assumptions which can find short enough lattice vectors ***,as an application of this new random sampling algorithm,the authors show that it can improve the performance of progressive BKZ algorithm in ***,the authors solve the Darmstadt's Lattice Challenge and get a series of new records in the dimension from 500 to 825,using the improved progressive BKZ algorithm.

关键词： Darmstadt’s lattice challenge lattice lattice reduction algorithm post-quantum cryptography random sampling

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A highly sensitive fluorescent HClO probe for discrimination between cancerous and normal cells/tissues

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Chinese Chemical Letters 2024年第6期35卷 417-420页

作者： Linfang Wang Jing Liu minghao Ren Wei Guo Department of Chemistry Changzhi UniversityChangzhi 046011China School of Chemistry and Chemical Engineering Shanxi UniversityTaiyuan 030006China

Elevated level of hypochlorous acid(HClO)is closely associated with cancer *** HClO level in cancer cells would provide important evidence in either early-stage cancer diagnostics or monitoring of its treatment *** this work,a new pyronine-based fluorescent probe for rapid and sensitive detection of HClO was developed by condensing meso-formyl pyronine(PyCHO)with 2-hydrazinopyridine to form meso-pyridylhydrazone-functionalized pyronine PyHP,PyHP is nonfluorescent due to the excited-state C=N isomerization nonradiative decay,whereas the HClO-triggered formation of meso-triazolopyridyl pyronine PyTP abolishes the C=N isomerization and thus greatly enhances the *** the probe,the cancer cells/tumor were distinguished with high-contrast from normal ones by laser confocal fluorescence imaging,and the tumor-to-normal(T/N)ratios obtained exceed the clinically acceptable threshold of ***,its capability of in vivo imaging tumor was also *** results indicate the potential of PyHP as an effective tool in the early clinical diagnosis of cancers.

关键词： Meso-pyridylhydrazone-functionalized pyronine Meso-substituents Tumor-to-normal(T/N)ratios Fluorescent probes Hypochlorous acid

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Different Types of Bone Fractures Observed by Terahertz Time-Domain Spectroscopy

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Acta Mechanica Solida Sinica 2024年第3期37卷 468-477页

作者： minghao Zhang Xianjia Meng Zhiyong Wang Chuanyong Qu Chuan Qu Donghui Fu Department of Mechanics Tianjin UniversityTianjin300072China Tianjin Key Laboratory of Modern Engineering Mechanics Tianjin300072China

Microcracks are common in compact bone,but their continued propagation can lead to macroscopic *** microcracks cannot be visualized radiographically,necessitating alternative noninvasive methods to identify excessive microcracking and prevent *** this study,terahertz time-domain spectroscopy(THz-TDS)was used to examine bone interiors near cracks resulting from loading in bovine tibia *** loading configurations,such as impact,quasi-static loading,and fatigue loading,known to induce different types of micro-scale damage,were *** values of refractive index and absorption coefficient of the bone samples were then determined from the THz-TDS spectra acquired before loading and after *** study revealed that different loading configurations led to varying terahertz optical coefficients associated with various types of bone ***,the refractive index notably increased under fatigue loading but remained relatively stable during quasi-static *** absorption coefficient of bone decreased only under fatigue ***,samples were subjected to axial and radial impacts without sustaining *** indicated that in the undamaged state,the change in refractive index was smaller compared to after impact failure,while the change in absorption coefficient remained consistent after *** radial impact loading,changes in refractive index and absorption coefficient were significantly more pronounced than under axial *** to loading,the measured value of refractive index was 2.72±0.11,and the absorption coefficient was 6.33±0.09 mm^(−1)at 0.5 THz.

关键词： Terahertz time-domain spectroscopy Bone Microdamage Noninvasive method

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