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Analysis of the stability and seismic behavior of the geosynthetic-reinforced embankments under earthquake

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Journal of Mountain Science 2020年第5期17卷 1269-1280页

作者： ZHU Hong-wei yao ling-kan XU Guang-xing School of Environment and Resources Southwest University of Science and TechnologyMianyang 621010China MOE Key Laboratory of High-speed Railway Engineering Southwest Jiaotong UniversityChengdu 610031China Research of National Defense Communication Shijiazhuang Tiedao UniversityShijiazhuang 050043

The stability and seismic behavior of geosynthetic-reinforced embankments during the earthquake is not well *** this paper,the damage types of embankments were summarized,and the seismic stability of reinforced embankment were analyzed through an earthquake damage investigation in the Wenchuan earthquake ***,large-scale shaking table model tests were performed on the geosynthetic-reinforced *** results show that the damage level of the reinforced embankment was almost less than that of the unreinforced *** peak seismic earth pressure was nonlinear along the height of the embankment,the largest peak seismic earth pressure was roughly in the middle of the embankment *** peak ground accelerations(PGA)amplification factor first showed an increasing pattern and then a decreasing pattern with the increase of elevation,but there was a final increasing trend along the height of the reinforced *** results can help to establish the proper design of the reinforcement embankments under earthquake conditions.

关键词： Reinforced embankment Stability Seismic behavior Shaking table model test

Laboratory investigations of earthquake-and landslideinduced composite surges

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Journal of Mountain Science 2017年第8期14卷 1537-1549页

作者： AI Hong-zhou yao ling-kan ZHOU Yi-liang School of Civil Engineering Southwest Jiaotong University Road and Railway Engineering Research Institute Sichuan Key Laboratory of Seismic Engineering and Technology MOE Key Laboratory of High-speed Railway Engineering

Seismic surges and landslides are both major secondary mountain hazards during an earthquake. This paper investigates earthquake-and landslide-induced composite surges through largescale shaking table water tank model experiments. A series of tests were conducted for various initial water depths, peak ground accelerations, slide impact velocities, and slide volumes. Based on the results of the tests, the effects of these parameters on the maximum wave heights of the earthquake-and landslide-induced composite surges were analyzed. An amplification coefficient of seismic surges was defined, and the prediction equation for the amplification coefficient was developed through nondimensional multiple linear regression analysis. Then, an empirical equation for the maximum wave heights of the composite surges was developed based on the amplification coefficient and Demirel's method. This equation provides a calculation method for earthquake-and landslide-induced composite surge waves.

关键词： Laboratory investigation Earthquake Landslide Composite surge Maximum wave height Wave surge

Size and spatial distribution of landslides induced by the2015 Gorkha earthquake in the Bhote Koshi river watershed

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Journal of Mountain Science 2017年第10期14卷 1938-1950页

作者： GUO Chen-wen HUANG Yi-dan yao ling-kan ALRADI Helal School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China Road and Railway Engineering Research Institute Sichuan Key Laboratory of Seismic Engineering and Technology Chengdu 610031 China MOE Key Laboratory of High-speed Railway Engineering Chengdu 610031 China

The Mw 7.8 Gorkha earthquake in Nepal on April 25, 2015, produced thousands of landslides in the Himalayan mountain range. After the earthquake, two field investigations along Araniko Highway were conducted. Then, using remote sensing technology and geographic information system(GIS)technology, 1481 landslides were identified along the Bhote Koshi river. Correlations between the spatial distribution of landslides with slope gradient and lithology were analyzed. The power-law relationship of the size distribution of earthquake-induced landslides was examined in both the Higher Himalaya and Lesser Himalaya. Possible reasons for the variability of the power exponent were explored by examining differences in the geological situations of these areas. Multi-threshold cellular automata were introduced to model the complexity of system components. Most of the landslides occurred at slope gradients of 30°–40°, and the landslide density was positively correlated with slope gradient. Landslides in hard rock areas were more common than in soft rock areas. The cumulative number-area distribution of landslides induced by the Gorkha earthquake exhibited a negative power-law relationship, but the power exponents were different: 1.13 in the Higher Himalaya, 1.36 and Lesser Himalaya. Furthermore,the geological conditions were more complex and varied in the Lesser Himalaya than in the Higher Himalaya, and the cellular automata simulation results indicated that, as the complexity of system components increased, the power exponent ***, the variability of the power exponent of landslide size distribution should ascribe to the complexity of geological situations in the Bhote Koshi river watershed.

关键词： Landslide distribution Gorkha earthquake Himalaya Cellular automata self-organized criticality

Damming of Large River by Debris Flow: Dynamic Process and Particle Composition

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Journal of Mountain Science 2014年第3期11卷 634-643页

作者： DU Cui yao ling-kan SHAKYA Subhashsagar LI Lun-gui SUN Xiao-dan School of Civil Engineering Southwest Jiaotong University MOE Key Laboratory of High-speed Railway Engineering Southwest Jiaotong University Road and Railway Engineering Research Institute Sichuan Key Laboratory of Aseismic Engineering and Technology

The frequency and extent of debris flows have increased tremendously due to the extreme weather and the Wenchuan earthquake on May 12, 2008. Previous studies focused on the debris flow from gullies damming the mountain streams. In this paper, an equation for the run-out distance of debris flow in the main river is proposed based on the dynamic equation of debris flow at different slopes given by Takahashi. By undertaking field investigations and flume experiments, a new calculation method of the volume of debris flow damming large river is obtained. Using the percolation theory and the renormalization group theory it was deduced that the large particles should comprise more than 50% for forming a stable debris flow dam. Hence, the criteria of damming large river by debris flow is presented in terms of run-out distance and grain composition which was then validated through the event of damming river by debris flow at Gaojia gully, the upper reaches of the Minjiang River, Sichuan, China, on July 3, 2011.

关键词： Debris flow Damming.large river Criteria Run-out distance Grain composition

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土工格栅加筋路堤抗震优化设计方法研究

四川大学学报（工程科学版） 2010年第5期42卷 99-104页

作者：王建姚令侃西南交通大学土木工程学院四川成都610031 抗震工程技术四川省重点实验室道路与铁道工程抗震技术研究所四川成都610031 西南交通大学高速铁路线路工程教育部重点实验室四川成都610031

为研究路堤工程的抗震设计问题,通过对汶川8.0级地震震区路堤震害进行调查,发现强震作用下未加筋路堤存在边坡坍塌和路面拉裂两种震害模式,而中上部铺设了土工格栅的路堤在强震作用下仍然基本保持完好。路堤顶部铺设长筋,可以阻断路面... 详细信息

为研究路堤工程的抗震设计问题,通过对汶川8.0级地震震区路堤震害进行调查,发现强震作用下未加筋路堤存在边坡坍塌和路面拉裂两种震害模式,而中上部铺设了土工格栅的路堤在强震作用下仍然基本保持完好。路堤顶部铺设长筋,可以阻断路面张拉裂缝向下扩展,从而防止了路堤本体滑坡的形成;路堤中上部铺设短筋,可以抑制坡面土体的侧向变形,从而防止了路堤坡面滑塌。基于震害调查结论,针对路堤常规加筋方案,提出了路堤中上部铺设短筋的加筋抗震优化设计方法。利用有限差分动力强度折减法,分别对常规加筋模型和加筋优化模型的抗震性能进行了计算。计算结果表明,优化设计以后,筋材用量减少了23.1%,路堤最大地震位移减小了19.0%,土工格栅最大受力减小了14%。优化设计不仅减少了土工格栅用量,而且达到了抑制边坡变形、提高路堤抗震性能的效果,为地震灾区路堤工程灾后重建提供了科学依据。

关键词：路基工程抗震设计有限差分法土工格栅加筋路堤地震

“5·12”汶川地震对线路工程抗震技术提出的新课题

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四川大学学报（工程科学版） 2009年第3期41卷 43-50页

作者：姚令侃陈强西南交通大学土木工程学院四川成都610031 四川省交通厅公路规划勘察设计研究院四川成都610041

"5·12"汶川地震对地震学、地震工程学都提出了新的挑战,对线路工程而言,核心科学问题是发生在山区的地震波传播的三维特性与地形巨大高差所导致的斜坡重力效应的耦合,对线路工程的破坏作用和工程在地震作用下的破坏机理。首先通过对汶... 详细信息

"5·12"汶川地震对地震学、地震工程学都提出了新的挑战,对线路工程而言,核心科学问题是发生在山区的地震波传播的三维特性与地形巨大高差所导致的斜坡重力效应的耦合,对线路工程的破坏作用和工程在地震作用下的破坏机理。首先通过对汶川地震灾害现象的分析,归纳出线路工程抗震技术面临的3个新的课题:即基于艰险山区地震波传播特性的公路铁路选线设计技术,地震诱发线路工程山地灾害机理及防治技术,以系统工程理论为指导的生命线工程抗震对策;同时对这3个课题的研究现状和研究思路提出了建议;然后从填补现行规范空白以及对现有规范技术框架进行延展和更新两个层面,论述了汶川地震对线路工程抗震设计规范发展的推动作用。

关键词：路基工程汶川地震选线设计地震诱发山地灾害抗震规范

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路堤震害模式及路堤动力特性研究

岩土力学 2010年第12期31卷 3801-3808页

作者：王建姚令侃吴伟西南交通大学土木工程学院成都610031 抗震工程技术四川省重点实验室道路与铁道工程抗震技术研究所成都610031

为研究强震区路堤的震害模式及动力特性,对汶川地震近场区路堤震害进行了调查,发现路堤震害以边坡上部拉裂、下部鼓张变形破坏模式为主,路堤震害严重程度与地震烈度、护坡措施和路堤本体加固措施关系密切,与路堤高度和地面横坡坡度关系... 详细信息

为研究强震区路堤的震害模式及动力特性,对汶川地震近场区路堤震害进行了调查,发现路堤震害以边坡上部拉裂、下部鼓张变形破坏模式为主,路堤震害严重程度与地震烈度、护坡措施和路堤本体加固措施关系密切,与路堤高度和地面横坡坡度关系不明显。利用振动台模型试验及数值模拟发现:加速度和动剪应力在路堤中上部增量最大、数值最大,且其最大值所在部位与拉裂缝出现部位基本一致;动土压力和位移在护坡道上方达到最大值,最大值部位与鼓张裂缝出现部位基本一致;张拉裂缝、鼓张裂缝均出现在距坡面3m深度范围内,表明路堤损害是一种浅表层震害模式。通过动力数值计算,发现不同高度的路堤地面峰值加速度(PGA)放大系数形态呈现3种类型:沿程单调递增形态(h20m)以及介于前二者之间的过渡形态(10m

关键词：路基工程震害模式振动台模型试验路堤抗震性能动力特性

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基于云模型的山区铁路选线设计方案评价模型

工程设计学报 2015年第4期22卷 372-380页

作者：罗圆姚令侃西南交通大学土木工程学院四川成都610031 高速铁路线路工程教育部重点实验室四川成都610031 抗震工程技术四川省重点实验室道路与铁道工程抗震技术研究所四川成都610031

山区铁路选线方案评价具有定性指标多的特点,传统铁路方案评价方法未考虑到定性指标中不确定性因素的影响,并且当定性指标与定量指标出现交叉时,缺乏相应的评价方法.首先利用云模型弥补了传统层次分析法在确定主观权重时对专家意见的不... 详细信息

山区铁路选线方案评价具有定性指标多的特点,传统铁路方案评价方法未考虑到定性指标中不确定性因素的影响,并且当定性指标与定量指标出现交叉时,缺乏相应的评价方法.首先利用云模型弥补了传统层次分析法在确定主观权重时对专家意见的不确定性考虑不足的缺点;再通过构建一种新的权重融合模式来计算指标的组合权重,以使指标权重达到主、客观统一;然后根据云模型的不确定性推理原理,在专家采用语言变量对定性指标进行评价的基础上,通过使用云发生器实现定性指标的有效量化;最后引入投影法进行方案优选.建立了综合考虑定量及定性指标的山区铁路选线方案评价模型,并通过一个原则方案的比选实例说明了模型的可行性和实用性.该研究为山区铁路选线设计的线路方案定性、定量综合评价提供了新的思路和手段.

关键词：山区铁路方案评价云模型层次分析法权重

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川藏铁路沿线特殊环境地质问题的认识与思考

铁道工程学报 2017年第1期34卷 1-5,59页

作者：许佑顶姚令侃中铁二院工程集团有限责任公司成都610031 西南交通大学成都610031

研究目的:川藏铁路途经的冈底斯-念青唐古拉山活动陆缘带与喜马拉雅褶皱带北部交界区,是铁路之前从未从事过建设的区域,面临缝合带内动力作用效应,冰湖溃决、冰川泥石流等特殊环境地质问题。因此需开展对川藏铁路沿线特殊环境地质问题... 详细信息

研究目的:川藏铁路途经的冈底斯-念青唐古拉山活动陆缘带与喜马拉雅褶皱带北部交界区,是铁路之前从未从事过建设的区域,面临缝合带内动力作用效应,冰湖溃决、冰川泥石流等特殊环境地质问题。因此需开展对川藏铁路沿线特殊环境地质问题的研究,为川藏铁路的成功修建和安全运营提供科技支撑。研究结论:(1)川藏铁路穿越三大缝合带地区,影响最大的是雅鲁藏布江蛇绿岩缝合带,需重视发生在喜马拉雅弧上的大地震对川藏铁路的影响,并建议利用先行工程开展缝合带地应力、地温测量等科研课题;(2)对海洋型冰川覆盖区的冰湖溃决、冰川泥石流等问题,应加强形成机理、运动特征等基础理论的研究,还需研究沿河线走高线位绕避沟谷灾害链等减灾选线策略。

关键词：川藏铁路缝合带内动力冰湖溃决冰川泥石流