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An Instrumented Flume to Characterize the Initiation Features of Flow Landslides

机译:一种仪器化的水槽来表征滑坡的始发特征

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摘要

Rainfall-induced landslides are on the rise due to global warming but the associated initiation mechanisms remain unclear. To observe the local initiation features of flow landslides under different rates of water supply, a well-instrumented flume capable of tightly controlling the inflow from the groundwater supply pipes and upstream discharge was built. Basal porewater pressure transducers (PPT) were installed to monitor the water pressure evolution, and a simple method to retrofit pressure transducers into PPTs was introduced. Internal movement behaviors of the slope body prior to the onset of and during a full failure were monitored with low-cost and small-size MEMS (Micro-Electro-Mechanical-Systems) accelerometers. A MEMS sensing package, termed the Smart Soil Particle (SSP, first generation), was also developed in conjunction with the laboratory testing program for field implementation in the future. In a set of experiments designed to investigate the initiation mechanism of a loose soil sample under a small and slow constant groundwater inflow, the MEMS accelerometers and basal PPTs successfully captured the intricate internal movement features and porewater pressure patterns. This warrants more systematic studies of the flow landslide initiation mechanism using the newly developed flume instrumentation.
机译:由于全球变暖,降雨引起的滑坡在增加,但相关的起爆机制仍不清楚。为了观察在不同供水速率下流动滑坡的局部初始特征,建造了一个仪表严密的水槽,该水槽能够严密控制地下水供应管的流入量和上游排放量。安装了基础孔隙水压力传感器(PPT)来监测水压力的变化,并介绍了一种将压力传感器改造为PPT的简单方法。用低成本和小尺寸的MEMS(微机电系统)加速度计监测斜坡主体在完全失效之前和完全失效期间的内部运动行为。还与实验室测试计划一起开发了一种称为“智能土壤颗粒”(SSP,第一代)的MEMS传感套件,以便将来在现场实施。在一组旨在调查少量且缓慢的恒定地下水流入下松散土壤样品引发机制的实验中,MEMS加速度计和基础PPT成功地捕获了复杂的内部运动特征和孔隙水压力模式。这需要使用新开发的水槽仪器对流滑坡发生机理进行更系统的研究。

著录项

  • 来源
    《Geotechnical testing journal》 |2014年第5期|748-768|共21页
  • 作者单位

    Department of Civil and Environmental Engineering, The Hong Kong Univ. of Science and Technology, HKSAR, China;

    Department of Civil and Environmental Engineering, The Hong Kong Univ. of Science and Technology, HKSAR, China;

    Department of Civil and Environmental Engineering, The Hong Kong Univ. of Science and Technology, HKSAR, China;

    Department of Electronic and Computer Engineering, The Hong Kong Univ. of Science and Technology, HKSAR, China;

    Department of Electronic and Computer Engineering, The Hong Kong Univ. of Science and Technology, HKSAR, China;

    Department of Electronic and Computer Engineering, The Hong Kong Univ. of Science and Technology, HKSAR, China;

    Department of Electronic and Computer Engineering, The Hong Kong Univ. of Science and Technology, HKSAR, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    MEMS accelerometer; calibration; landslide initiation mechanism; flume; porewater pressure transducer;

    机译:MEMS加速度计;校准;滑坡发生机理长笛孔隙水压力传感器;

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