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“对薄喀斯特的地面电阻率法的可靠性评估”薄壁板喀斯特地区的污水孔出现是在其使用寿命期间结构结构和结构失败期间成本超越的常见原因。 在施工之前，可以通过改进的岩土工场调查来降低这些故障的频率。 拟议的研究的目的是调查并证明使用电阻率方法来提高粘土土壤喀斯特地区基础设计的可靠性。 目前，粘土土壤喀斯特地区的现场调查方法通常仅限于钻孔和其他类型的侵入性探针。 这些方法用于定位可能导致下沉孔形成的条件的可靠性很差。 这项研究中的研究活动将评估地球电阻率方法作为在这些领域进行现场调查的工具的可靠性，并证明其用作提高基础可靠性的方法。 在这项研究中，将研究已知的地下空隙和频繁形成的两个领域。 将使用带有多个电极的地球电阻率计进行许多不同间距的线调查。 数据指示的异常将使用无聊的方法或发掘确认。 测试的结果将用于发展线和节点间距之间的关系，以及检测给定尺寸的异常的可能性。 ***