Evaluation of Reliability of Earth Resistivity Method in Thinly Mantled Karst

薄幔岩溶地电阻率法可靠性评价

• 批准号: 9734899
• 负责人: Mary Roth
• 金额: $ 7.64万
• 依托单位: Lafayette College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-01 至 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9734899&HistoricalAwards=false
• 关键词: Evaluation; Reliability; Earth; Resistivity; Method

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. ***

9734899 Roth “薄地幔喀斯特地电阻率方法的可靠性评估” 薄地幔喀斯特地区的天坑出现是施工期间成本超支和结构在其使用寿命期间失效的常见原因。 通过在施工前改进岩土工程现场调查可以减少这些故障的发生频率。 本研究的目的是调查和论证电阻率法的使用，以提高粘土岩溶地区地基设计的可靠性。 目前，粘土岩溶地区的现场勘察方法一般仅限于钻孔和其他类型的侵入式探头。 这些用于定位可能导致天坑形成的条件的方法的可靠性很差。 本研究的研究活动将评估地球电阻率方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，将研究已知的地下空隙和频繁形成的天坑形成的两个区域。 将使用具有多个电极的地球电阻率计进行多个不同间距的线路勘测。 数据表明的异常将通过钻孔方法或挖掘来确认。 测试结果将用于开发线间距和节点间距以及检测给定尺寸异常的概率之间的关系。 ***