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首页> 外文期刊>Australian Geomechanics >POTENTIAL BIOLOGICAL AND CHEMICAL CLOGGING OF PIEZOMETER FILTERS IN ACID SULPHATE SOIL
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POTENTIAL BIOLOGICAL AND CHEMICAL CLOGGING OF PIEZOMETER FILTERS IN ACID SULPHATE SOIL

机译：酸性硫酸盐土壤中压力计过滤器的潜在生物学和化学堵塞

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摘要

Instrumentation for performance monitoring of an embankment built on soft soils is vital for assessing the progress of consolidation and confirming (or refuting) soil parameters used in design when there are significant design uncertainties and the monitoring data can be used to calibrate the design soil parameters. A suite of instruments including settlement plates, extensometers, piezometers, inclinometers is often employed for this purpose. In the first Author's experience, erroneous readings interpretations of pore water pressure (PWP) readings have been reported in various case studies involving transport infrastructure development and reclamations works both in Australia and South East Asia, especially in low-lying acid sulphate soil floodplains. It has been observed that in spite of the presence of vertical drains (PVDs), excess pore water pressure readings from vibrating wire piezometers (VWPs) do not always dissipate as fast as expected especially after a certain period of time, typically a year. The article discusses the potential factors affecting the reliability of VWPs including filter tip clogging, extreme smearing of soil adjoining the filter, gas generation or cavitation, chemical alteration or corrosion of the filter, electro-osmotic effects and cavitation due to bacterial activity. Based on this, the response of VWPs may be divided into a distinct trilinear trend, observed for much of the Australian northern and eastern coastal belt that is predominantly affected by Acid sulphate soil (ASS) conditions where oxidisable pyrite layers are present within relatively shallow depths of the upper Holocene clay.
机译：用于软土构建的堤防性能监测的仪器对于评估设计的巩固和确认（或矫正）在设计中使用的土壤参数的进展至关重要，当存在显着的设计不确定性并且监测数据可用于校准设计土壤参数时。一套仪器，包括沉降板，伸长仪，压力计，压力计，倾角仪通常用于此目的。在第一作者的经验中，涉及运输基础设施开发和澳大利亚和东南亚的综合作用的各种案例研究中，孔隙水压力（PWP）读数的错误读数解释尤其是低洼酸性硫酸盐土壤泛滥平原。已经观察到，尽管存在垂直排水沟（PVDS），但是从振动线压力计（VWP）的过量的孔隙水压读数并不总是如预期的那样快速消散，特别是在一定时间内，通常是一年。本文讨论了影响VWP的可靠性的潜在因素，包括过滤尖堵塞，土壤极端涂抹，邻近过滤器，气体产生或空化，化学改变或腐蚀，过滤器，电渗效应和细菌活性引起的空化。基于这一点，VWP的响应可以分为一个不同的三线趋势，观察到澳大利亚北部和东部沿海皮带主要受酸性硫酸盐土壤（Ass）条件的影响，其中氧化硫铁矿层在相对较浅的深度内上全新世粘土。

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  • 来源
    《Australian Geomechanics》 |2017年第2期|共7页
  • 作者

    Buddhima Indraratna; Pankaj Baral; Jay Ameratunga;

  • 作者单位

    Distinguished Professor of Civil Engineering and Research Director Centre for Geomechanics and Railway Engineering University ofWollongong Australia;

    PhD Candidate Centre for Geomechanics and Railway Engineering University ofWollongong Australia;

    Principal Geotechnical Engineer Golder Associates Brisbane Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质力学;
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