Masters Theses

Jiawei Li

Keywords and Phrases

ERT; Geophysical tools; Lake Chesterfield; MASW; SP

Abstract

"The Lake Chesterfield North Dam in Wildwood city, Missouri has been leaking, more or less continuously since the dam was constructed in 1986 despite mitigation efforts in 1988, 1994, 1995, 2004, and 2005. Neither the grouting efforts in 1988, 1994, 1995, 2004 or 2005, nor the placement and rehabilitation of an impervious clay liner in 2005 has solved the problem. Indeed, in June of 2017, the water level in Lake Chesterfield dropped at an alarmingly rapid rate.

Prior to authorizing additional mitigation work, the Lake Chesterfield Home Owners Association (LCHOA) decided to acquire geophysical data across the dry lake bed. The intent was to 1) map variable depth to the top of the rock; 2) identify karst features, including sinkholes and joints; 3) identify potential seepage pathway; and 4) determine soil and rock quality (based on resistivity and shear-wave velocity). It was believed that this information would help a geotechnical engineering firm determine the most appropriate mitigation plan.

During the survey, electrical resistivity tomography (ERT), multichannel analyses of surface wave (MASW) and spontaneous-potential (SP) geophysical tools were acquired across the dry lake bed. The interpretation of the data shows average depth to the top of rock is 10 ft. which consist with the test pit result by Geotechnology, Inc.; the rock above elevation of 600 ft. in Lake Chesterfield is mostly weathered/fractured limestone and can be described as poor-quality rock which could easily develop karst feature; three low resistivity zones at elevation below 600 ft. were found and could serve as vertical conduit of flowing groundwater; and two prominent low resistivity zones were found that could serve as potential seepage pathways through the North Dam"--Abstract, page iii.

Advisor(s)

Anderson, Neil L. (Neil Lennart), 1954-

Committee Member(s)

Rogers, J. David
Torgashov, Evgeniy V.

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geological Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2018

Pagination

viii, 68 pages

Note about bibliography

Includes bibliographical references (pages 66-67).

Geographic Coverage

Wildwood, Missouri

Rights

© 2018 Jia Wei Li, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 11430

Electronic OCLC #

1084479917

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Thesis Location

 
COinS