Extent of Thin Surfacial Fracture Detection Using Geophysical Survey: A Case Study of Parwan Gravity Dam, Jhalawar, Rajasthan, India

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-06-01 DOI:10.1007/s00024-024-03513-0
Jyoti Singh, Anand Joshi, Saurabh Sharma, Mohit Pandey, Anamika Sahu, Sandeep Singh, Krishna Mohan Jaiswal
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Abstract

Parwan Gravity Dam is under construction stage in the Jhalawar district of Rajasthan, India. A thin sub-vertical surficial fracture trending N 75°W to S 75°E has been observed in the foundation area of the dam. Geophysical techniques such as electrical resistivity tomography (ERT), seismic refraction tomography (SRT), and multichannel analysis of surface waves (MASW) are utilized extensively in the field of civil engineering, exploration geophysics for the assessment and construction of large-scale infrastructures such as dams. These methods provide critical information about the subsurface conditions without the need of extensive drilling and excavation. The combination of electrical resistivity tomography (ERT), seismic refraction (SR), and multichannel analysis of surface waves (MASW) techniques with the different acquisition parameters have been used to image the extent of shallow subsurface geological structures. Various geophysical Surveys have been carried out along several profiles in the longitudinal direction and along the transverse direction to the fault axis. A total of 13 refraction and resistivity profiles were conducted of which 9 were transverse profiles and 4 were longitudinal profiles. A total of nine MASW profiles were conducted of which 8 are transverse profiles and 1 is a longitudinal profile. In this paper, the subsurface distribution of seismic wave velocity and electrical resistivity have been studied to identify any possible anomalous zone in bedrock and to detect the downward extension of surface fracture of brittle fault using the afore mentioned methods. The vertical and lateral extent of the surface fracture of the fault has been investigated by the analysis of these survey results. The analysis of the results indicates that a very tight and narrow fracture is present in the shallow subsurface.

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利用地球物理勘测探测薄地表断裂的范围:印度拉贾斯坦邦贾拉瓦尔帕尔万重力坝案例研究
帕尔万重力坝位于印度拉贾斯坦邦贾拉瓦尔地区,目前正处于施工阶段。在大坝的地基区域观察到了一条细长的次垂直地表断裂,其走向为 N 75°W 至 S 75°E。电阻率层析成像(ERT)、地震折射层析成像(SRT)和表面波多通道分析(MASW)等地球物理技术被广泛应用于土木工程和勘探地球物理领域,以评估和建造大坝等大型基础设施。这些方法可提供有关地下条件的重要信息,而无需进行大量钻探和挖掘。电阻率层析成像(ERT)、地震折射(SR)和多道面波分析(MASW)技术与不同的采集参数相结合,已被用于对浅层地下地质结构的范围进行成像。沿断层轴线的纵向和横向的几个剖面进行了各种地球物理勘测。共进行了 13 次折射和电阻率剖面测量,其中 9 次为横向剖面测量,4 次为纵向剖面测量。共绘制了 9 个 MASW 剖面图,其中 8 个为横向剖面图,1 个为纵向剖面图。本文对地震波速度和电阻率的地下分布进行了研究,以确定基岩中可能存在的异常区,并利用上述方法探测脆性断层表面断裂向下延伸的情况。通过分析这些勘测结果,对断层表面断裂的垂直和横向范围进行了调查。结果分析表明,在浅层地下存在一条非常紧密和狭窄的断裂。
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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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