Field-scale bio-cementation tests to improve sands

被引：238

作者：

Gomez, Michael G. ^{[1
]}

Martinez, Brian C. ^{[2
]}

Dejong, Jason T. ^{[1
]}

Hunt, Chris E. ^{[2
]}

Devlaming, Len A. ^{[3
]}

Major, David W. ^{[3
]}

Dworatzek, Sandra M. ^{[4
]}

机构：

[1] Department of Civil and Environmental Engineering, University of California: Davis, Davis, CA

[2] Geosyntec Consultants, Oakland, CA

[3] Geosyntec Consultants, Guelph, ON

[4] SiREM Laboratories, Guelph, ON

来源：

Proceedings of the Institution of Civil Engineers: Ground Improvement | 2015年 / 168卷 / 03期

关键词：

Cementing (shafts) - Precipitation (chemical) - Calcium carbonate - Urea - Calcium chloride - Erosion - Soil testing;

D O I：

10.1680/grim.13.00052

中图分类号：

学科分类号：

摘要：

Microbially induced calcite precipitation (MICP) is a bio-mediated cementation process that improves the geotechnical properties of soils through the precipitation of calcite at soil particle contacts. This study presents a field-scale, surficial application of MICP to improve the erosion resistance of loose sand deposits and provide surface stabilisation for dust control and future re-vegetation. Three test plots were treated with a bacterial culture and nutrient solutions at varying concentrations, and a fourth test plot served as a control. Improvement was assessed to a depth of 40 cm using dynamic cone penetration (DCP) testing and calcite content measurements. The most improved test plot received the lowest concentrations of urea and calcium chloride and developed a stiff crust measuring 2.5 cm thick, which exhibited increased resistance to erosion. DCP testing and calcite content measurements indicated improvement to a depth of approximately 28 cm near the targeted depth of 30 cm. The results suggest that further optimisation of solutions and techniques could render MICP viable for larger-scale applications © 2014, Thomas Telford Services Ltd . All rights reserved.

引用

页码：206 / 216

页数：10

共 18 条

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