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Effects of site conditions on earthquake ground motion and their applications in seismic design in loess region

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Journal of Mountain Science 2017年第6期14卷 1185-1193页

作者： wang lan-min WU Zhi-jian XIA Kun Key Laboratory of Loess Earthquake Engineering Lanzhou Institute of Seismology China Earthquake Administration Lanzhou 73000 China Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province Lanzhou 730000 China

The Loess Plateau is an earthquake prone region of China, where the effects of loess deposit on ground motion were discovered during the 2008 Wenchuan earthquake(Ms8.0) and the 2013 minxian-Zhangxian earthquake(Ms6.6). The field investigations, observations, and analyses indicated that large number of casualties and tremendous economic losses were caused not only by collapse and damage of houses with poor seismic performance, landslides, but also amplification effects of site conditions, topography and thickness of loess deposit, on ground motion. In this paper, we chose Dazhai Village and Majiagou Village as the typical loess site affected by the two earthquakes for intensity evaluation, borehole exploration, temporary strong motion array, micro tremor survey, and numerical analysis. The aim is to explore the relations between amplification factors and site conditions in terms of topography and thickness of loess deposit. We also developed site amplification factors of ground motion for engineering design consideration at loess sites. The results showed that the amplification effects are more predominant with increase in thickness of loess deposit and slope height. The amplification mayincrease seismic intensity by 1 degree, PGA and predominant period by 2 times, respectively.

关键词： Loessial site Field investigation Ground motion observation Micro tremor observation Loess topography Loess thickness Site effects Seismic design

Characteristics, causation, and rehabilitation of Zhouqu extraordinarily serious debris flows in 2010, China

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Journal of Central South University 2013年第8期20卷 2342-2348页

作者： wang lan-min WU Zhi-jian wang Ping CHEN Tuo lanzhou Institute of Seismology China Earthquake Administration Lanzhou 730000 China Key laboratory of Loess Earthquake Engineering (China Earthquake Administration) Lanzhou 730000 China Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province Lanzhou 730000 China State Key Laboratory of Frozen Soil Engineering (Cold and Arid Regions Environmental and Engineering Institute Chinese Academy of Sciences) Lanzhou 730000 China

In early morning of Aug 8th, 2010, the rain-triggered tremendous debris flows broke out simultaneously at the Sanyanyu ravine and Luojiayu ravine, which locate in the north part of Zhouqu County town. The debris flow is the most severe event of the same kind of disasters in the past sixty years in China, which caused great losses of people's lives and properties. Based on field investigation, remote sensing image interpretation and analysis of local climatological data, the local topographical conditions, active tectonic movement, massive debris source and torrential rains were the main formation causes which induced the catastrophic debris flows. Moreover, detailed geological surveys were carried out following the disaster, the other geological potential hazard sites were found out, and the geological and seismic hazard assessment has been put into practice. At last, scientific and appropriate countermeasures have been suggested to prevent and mitigate the extraordinarily serious debris flow.

关键词： debris flows hazard assessment geological survey Zhouqu county

Influence of site conditions on ground motion at far field loess sites during strong earthquake

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Journal of Central South University 2013年第8期20卷 2333-2341页

作者： WU Zhi-jian wang lan-min wang Ping CHEN Tuo SHI Hang YANG Xiao-peng lanzhou Institute of Seismology China Earthquake Administration Lanzhou 730000 China Key Laboratory of Loess Earthquake Engineering China Earthquake Administration Lanzhou 730000 China Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province Lanzhou 730000 China State Key Laboratory of Frozen Soil Engineering (Cold and Arid Regions Environmental and Engineering Institute Chinese Academy of Sciences) Lanzhou 730000 China

Loess is widely distributed in China and the Loess Plateau is one of the major areas where strong earthquakes often take place. The seismic amplification effects were discovered in the Plateau during the Wenchuan Ms8.0 earthquake and some other strong events. Based on earth tremor observation, borehole exploration and site seismic response analysis, the site effects of topography of Loess Yuan on ground motion were investigated in details. The earth tremor investigation shows that predominant frequencies at the bottom sites of Loess Yuan are greater than those at the top obviously. The sites seismic response analysis shows that the Loess Yuan may amplify peak ground acceleration (PGA) by 1.44 2.0 times. Therefore, site effects of mountains and loess topography on ground motion should be taken account into in seismic design in loess regions.

关键词： earth tremor borehole exploration site effects seismic response

Complex Boronized Layer on the Hot-dip Aluminized Steels and Its Surface Performances

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材料热处理学报 2004年第05B期25卷 653-656页

作者： LUOXin-min LIDian-kai wanglan CHENKang-min JiangsuUniversity ZhenjiangJiangsuP.R.China

Plain carbon steels were dipped in molten aluminum bath at 720°C ±5°C and diffused for 1, 2.5 and 6 hours respectively and then boronized at 950°C for 6 hours. The oxidation, hot-corrosion and abrasion resistance behavior were examined. The experimental results showed the compounds of the aluminized layer, from the surface to the matrix, were composed of Fe2Al5 ( n -phase ) .. Fe3Al ( -phase ) and a phase. The microstructure of aluminized plus complex boronized were similar to that simplex boronized. The XRD analysis results indicated that there existed Fe2B> Fe2AlB2and Fe2Als in this kind of layer. The simplex aluminized layers still remained bright gray appearance when oxidized at 950°C, but complex boronized layer was not able to resist oxidization at the temperature. Both the layers of complex boronized and aluminized had the same anti-oxidization level in the circulative oxidization tests, and also good anti-corrosion ability in molten salt medium. Under dry abrasive conditions, wear resistance of complex boronized layer was superior to the aluminized layer.

关键词：热镀喷铝钢硼化热腐蚀磨损

黄土地层大规模地震液化滑移的机理与风险评估

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岩土工程学报 2020年第1期42卷 1-19页

作者：王兰民中国地震局(甘肃省)黄土地震工程重点实验室中国地震局兰州地震研究所

2018年印度尼西亚帕卢7.4级地震造成的低角度饱和土层大规模滑移灾难对黄土地区地震造成的土层大规模低角度滑动灾害研究具有重要的警示意义。为了研究黄土地层大规模地震液化滑移机理,通过对国内外强震触发的典型黄土地震液化灾害进行... 详细信息

2018年印度尼西亚帕卢7.4级地震造成的低角度饱和土层大规模滑移灾难对黄土地区地震造成的土层大规模低角度滑动灾害研究具有重要的警示意义。为了研究黄土地层大规模地震液化滑移机理,通过对国内外强震触发的典型黄土地震液化灾害进行深入的调查分析,基于现场大型探槽和钻孔勘探、室内动三轴试验、现场剪切波速测试、SPT测试、土体微结构测试和数值模拟分析,揭示了饱和黄土液化的特征和机理,提出了饱和黄土场地液化的初判与详判方法,研究了黄土大规模地层液化滑移的滑动条件、运动学及动力学特征,论述了黄土地层大规模地震液化滑移的机制,构建了滑距和致灾范围预测模型;提出了液化滑移灾害的概率风险评估方法,给出了不同超越概率下黄土地层大规模地震液化灾害风险区划图;并从主动防控、被动防控和综合监测预警3个方面提出了黄土地层大规模液化滑移灾害的防控途径及措施。研究结果可为黄土地层大规模液化滑移灾害风险评估与防治提供理论依据。

关键词：黄土地层液化判别滑移机理滑距和致灾范围风险评估

Regulating crystallization and retarding oxidation in Sn-Pb perovskite via 1D cation engineering for high performance all-perovskite tandem solar cells

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Journal of Energy Chemistry 2025年第1期100卷 646-652页

作者： Ranran Liu Xin Zheng Zaiwei wang Miaomiao Zeng Chunxiang lan Shaomin Yang Shangzhi Li Awen wang min Li Jing Guo Xuefei Weng Yaoguang Rong Xiong Li Michael Gr?tzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences School of Physics and Optoelectronic Engineering Hainan University Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO) Chinese Academy of Sciences School of Chemistry Chemical Engineering and Life Sciences State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

All-perovskite tandem solar cells have the potential to surpass the theoretical efficiency limit of single junction solar cells by reducing thermalization ***,the challenges encompass the oxidation of Sn2+to Sn4+and uncontrolled crystallization kinetics in Sn-Pb perovskites,leading to nonradiative recombination and compositional heterogeneity to decrease photovoltaic efficiency and operational ***,we introduced an ionic liquid additive,1-ethyl-3-methylimidazolium iodide （EMIMI） into Sn-Pb perovskite precursor to form low-dimensional Sn-rich/pure-Sn perovskites at grain boundaries,which mitigates oxidation of Sn2+to Sn4+and regulates the film-forming dynamics of Sn/Pb-based perovskite *** optimized single-junction Sn-Pb perovskite devices incorporating EMIMI achieved a high efficiency of 22.87%.Furthermore,combined with wide-bandgap perovskite sub-cells in tandem device,we demonstrate 2-terminal all-perovskite tandem solar cells with a power conversion efficiency of 28.34%,achieving improved operational stability.

关键词： All-perovskite tandem solar cells Sn-Pb perovskite 1D Regulated crystallization Antioxidation

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第六届国际地震岩土工程大会综述

地震工程学报 2015年第4期37卷 907-914页

作者：王兰民中国地震局兰州地震研究所甘肃兰州730000 中国地震局黄土地震工程重点实验室甘肃兰州730000

第六届国际地震岩土工程大会于2015年11月1-4日在新西兰克莱斯特彻奇市召开。本文介绍了大会概况;阐述了大会设置的21个专题,并综述了场地效应和小区划,斜坡、河堤、大坝与废弃物填埋场,地震危险性与强地面运动,土壤液化与侧向扩展共4... 详细信息

第六届国际地震岩土工程大会于2015年11月1-4日在新西兰克莱斯特彻奇市召开。本文介绍了大会概况;阐述了大会设置的21个专题,并综述了场地效应和小区划,斜坡、河堤、大坝与废弃物填埋场,地震危险性与强地面运动,土壤液化与侧向扩展共4个重要专题分会的交流内容;通报了国际地震岩土工程及其问题技术委员会(TC203)全委会内容和决议事项;论述了相关领域的研究进展与亮点,包括新西兰坎特伯雷地震灾后重建催生了岩土工程共享数据库建设取得突破性进展;土壤液化与侧向扩展研究成为国际岩土地震工程一大热点研究领域;提出了在液化机理、液化势评价、液化后变形和基于性能的抗液化工程设计等方面需要进一步研究的重要问题;运动颗粒模拟方法实现了对斜坡破坏的全过程数值模拟;"Ishihara-Idriss-Finn演讲特别分会"成为本次会议一大亮点;2010-2011年新西兰坎特伯雷地震序列(CES)发生后,美国与新西兰开展了非常紧密的合作调查与研究工作,并在地震序列认识、灾害快速评估、确保稳健恢复的政策与规划分析等方面取得了多方受益的科学进展。

关键词：国际会议地震岩土工程

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桩基负摩阻力研究中几个基本理论问题的探讨

岩石力学与工程学报 2006年第1期25卷 211-216页

作者：孙军杰王兰民中国地震局地震预测研究所兰州基地

桩基负摩阻力是个复杂的问题,由于其与土力学诸多领域的理论问题都有关联,所以对桩基负摩阻力的研究必然可加深对其他相关理论问题的认识。到目前为止,与桩基负摩阻力直接相关的诸多理论问题,都还未能得出令人满意的解答。针对这一现状... 详细信息

桩基负摩阻力是个复杂的问题,由于其与土力学诸多领域的理论问题都有关联,所以对桩基负摩阻力的研究必然可加深对其他相关理论问题的认识。到目前为止,与桩基负摩阻力直接相关的诸多理论问题,都还未能得出令人满意的解答。针对这一现状,选取桩基负摩阻力研究中亟待解决的3个基本理论问题(影响桩基负摩阻力的主导因素、负摩阻力的实质以及负摩阻力的动力来源)加以研究。基于现场试验资料,从中分析得出影响桩基负摩阻力的2个主导因素,并据此从理论上推导出了桩基负摩阻力的实质,即桩基负摩阻力可看作是桩周有效沉降土体的重力在土体抗剪强度的转化之下而产生的一种作用于桩身的力,最后建立一个说明桩基负摩阻力动力来源的理论模型。

关键词：基础工程负摩阻力动力来源主导因素重力势能

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含粘粒量黄土抗震陷性能的试验研究

水文地质工程地质 2007年第3期34卷 63-66页

作者：李兰王兰民中国地震局地震预测研究所兰州科技创新基地中国地震局黄土地震工程开放实验室兰州730000

对甘肃含粘粒黄土粘粒含量不同的原状土样进行了室内动三轴试验、激光粒度分析试验、化学分析和电镜扫描试验,对比分析试验结果后得出,粘粒含量不同,可引起黄土动力稳定性的变化;动剪应力强度与粘粒含量并非呈单调增加关系,而呈抛物线型... 详细信息

对甘肃含粘粒黄土粘粒含量不同的原状土样进行了室内动三轴试验、激光粒度分析试验、化学分析和电镜扫描试验,对比分析试验结果后得出,粘粒含量不同,可引起黄土动力稳定性的变化;动剪应力强度与粘粒含量并非呈单调增加关系,而呈抛物线型;含粘粒的黄土,在同一固结比时,抗震陷性能最低点在粘粒含量16%~17%之间。

关键词：抗震陷性能粘粒含量黄土