Services Archives - Moretrench

Ash Pond Services

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Clean closure or rehabilitation of coal combustible storage (CCR) facilities can be significantly enhanced in terms of both safety and reduced project duration by the implementation of specialty dewatering, grouting and cut-off and containment techniques.   Moretrench offers a range of site-specific options to assist facility owners in meeting project requirements efficiently and effectively.  Learn more here.

Ash Pond Services

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Clean closure or rehabilitation of coal combustible storage (CCR) facilities can be significantly enhanced in terms of both safety and reduced project duration by the implementation of specialty dewatering, grouting and cut-off and containment techniques.   Moretrench offers a range of site-specific options to assist facility owners in meeting project requirements efficiently and effectively.  Learn more here.

Additional Services

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Moretrench’s services also include earth retention, deep foundations, ground freezing, and industrial construction. This wide range of in-house expertise allows the company to offer turnkey solutions to address multiple geotechnical challenges at an individual storage facility, often under a single contract.

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Overview

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Perimeter or down-gradient cut-off or containment to prevent migration of contaminated groundwater and facilitate ash pond closure can be accomplished by a range of specialty geotechnical methods. Selection of the most appropriate option is dependent on the subsurface conditions, site-specific project requirements, and cost considerations.

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Grouted Cut-offs

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Grouted groundwater cut-offs can be constructed by the installation of overlapping jet grout columns to an impermeable stratum or by the vibrated beam method. Vibrated beam cut-offs are installed by the repeated driving of a wide-flanged steel beam using a vibratory hammer, while simultaneously injecting cement-bentonite slurry through nozzles attached to the underside of the beam to form a thin curtain wall.

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Slurry Trenches

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Soil-bentonite slurry trenches are constructed by excavating and keying into a suitable cut-off stratum under a viscous slurry to maintain sidewall stability. The excavated material is mixed with bentonite and returned to the trench, displacing the slurry and completing the cut-off. When additional strength is required, cement grout may be added to the backfill.

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Dewatering and Pressure Relief

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Permanent dewatering systems lower the phreatic surface within earthen embankments to improve overall stability. Relief wells reduce pore water pressure in confined aquifers or in stratified ground conditions. The water recovered from the relief wells is typically disposed of in accordance with facility or local permitting requirements.

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Compaction Grouting

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Compaction grouting is the pressurized injection of a stiff mortar-like grout to displace and densify the surrounding soils, thus improving the bearing capacity of the soil matrix. This technique is well suited to liquefaction mitigation and to control settlement of utility, outfall structures and pipes.

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