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FRAC GROUTING

 

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.