Evaluation of Reliability of Earth Resistivity Method in Thinly Mantled Karst

小行星9734899 “薄覆盖岩溶大地电阻率法可靠性评价” 在薄地幔岩溶地区出现的天坑是施工期间成本超支和结构在使用寿命期间失效的常见原因。 这些故障的频率可以通过在施工前改进岩土工程现场调查来降低。 拟议研究的目的是调查和演示使用电阻率法，以增加在岩溶地区的粘土地基设计的可靠性。 目前，在粘土岩溶地区的现场调查方法一般仅限于钻孔和其他类型的侵入式探针。 这些方法用于定位可能导致天坑形成的条件的可靠性很差。 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调查工具的可靠性，并展示其作为提高地基可靠性的方法的用途。 在这项研究中，两个已知的地下空洞和频繁的天坑形成的领域将进行调查。 将使用带有多个电极的地电阻率计进行若干不同间距的线路勘测。 将使用钻孔方法或挖掘来确认数据所指示的异常。 测试结果将用于确定线路和节点间距与探测到给定规模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. ***