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Advanced Construction Techniques

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A CASE HISTORY

Douglas, M. Heenan1 , P.Eng., Member, ASCE and Michael Xu2, Ph.D., P.Eng.

The United States Postal Service's (USPS) Eastpointe Facility in Clarksburg, West Virginia is located at the site of a former strip mine. Reclamation activities prior to construction were accomplished by backfilling the stripped area with the excavated materials after the coal seam had been removed. Subsurface investigations performed for the design of the facility identified settlement concerns due to loose fill and the existence of nested cobbles and boulders. To address this concern the site was reportedly over excavated and replaced with a controlled engineered fill.

GROUTING TO MINIMIZE SETTLEMENTS PRIOR TO TUNNEL EXCAVATION

A CASE STUDY

Douglas, M. Heenan¹ , P.Eng., Member, ASCE and Michael Xu², Ph.D., P.Eng.

Phase I of the Glen Echo Creek Culvert Reconstruction Project, involved lowering the invert of an existing concrete arch tunnel along with replacing an existing corrugated metal pipe (CMP) with a new tunnel between 28th and 29th street in Oakland, California. All construction work was performed within the tunnel by hand mining techniques. Due to the close proximity to residential buildings, roadways and utilities, various grouting techniques were applied to minimize ground settlement, stabilize subgrade soils and reduce water seepage to facilitate hand excavation.

STATE OF THE ART IN COMPUTER MONITORING & ANALYSIS OF GROUTING

ANALYSIS

Trent L. Dreese, M. ASCE., David B. Wilson, M. ASCE² , Douglas M. Heenan, M. ASCE³, and James Cockburn⁴

Computer monitoring and analysis of grouting has come of age as a reliable and effective tool for better, faster, and less expensive grouting. This paper traces the development of computer monitoring and control systems, summarizes the benefits that can be realized from use of the systems, and presents the latest developments in specialized technology developed specifically for permeation grouting.