Evaluation of Reliability of Earth Resistivity Method in Thinly Mantled Karst

9734899 Roth“评估薄覆盖岩溶地区地电阻率法的可靠性”在薄覆盖岩溶地区发生的塌陷是施工期间成本超支和结构物在其使用年限内失效的常见原因。通过改进施工前的岩土现场勘察，可以减少这些故障的发生频率。这项研究的目的是调查和论证在具有粘性土壤的岩溶地区使用电阻率法来提高基础设计的可靠性。目前，在含粘性土的岩溶地区，现场勘察方法一般局限于钻孔和其他类型的侵入性探头。这些方法用于定位可能导致天坑形成的条件的可靠性较差。本研究中的研究活动将评估地电阻率法作为这些地区现场勘察工具的可靠性，并演示其作为提高地基可靠性的方法的用途。在这项研究中，将调查两个已知的地下空洞和频繁的天坑形成区域。将使用具有多个电极的大地电阻率计进行多个不同间距的线路测量。数据显示的异常情况将通过钻探或挖掘的方法进行确认。测试的结果将被用来建立线和节点间距与检测到给定大小的异常的概率之间的关系。***

9734899 Roth "Evaluation of Reliability of the Earth Resistivity Method in Thinly Mantled Karst" Sinkhole occurrences in areas of thinly mantles karst are a common cause of cost overruns during construction and failures of structures during their useful life. The frequency of these failures can be reduced by improved geotechnical site investigation prior to construction. The objective of the proposed study is to investigate and demonstrate the use of resistivity methods to increase the reliability of foundation design in karst areas with clay soils. At the present time, methods of site investigation in karst areas with clay soils are generally limited to borings and other types of intrusive probes. The reliability of these methods for locating conditions which may lead to the formation of sinkholes is poor. The research activities in this study will evaluate the reliability of the earth resistivity method as a tool for site investigation in these areas and demonstrate its use as a method to improve foundation reliability. In this study, two areas of known subsurface voids and frequent sinkhole formation will be investigated. Line surveys at a number of different spacings will be conducted using an earth resistivity meter with multiple electrodes. Anomalies indicated by the data will be confirmed using boring methods or excavation. The results of the testing will be used to develop relationships between line and node spacing and the probability of detecting an anomaly of a given size. ***