Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Limited Mobility Displacement Grouting Design for Foundation Bearing Improvement
Subsurface investigation for the replacement of Tatamy Bridge over Bushkill Creek in Northampton County, Pennsylvania showed evidence of extensive solution activity within the dolomite bedrock underlying the proposed southwest wing. Test borings revealed a shallow top of rock profile over the wing area and alternating solution zones extending well inside the rock strata. A rigorous alternatives analysis was initiated to determine the preferred foundation system to support the southwest wing. Based on the analysis of subsurface data, deep foundation systems that derive resistance from skin friction were eliminated from consideration. Spread footing on bedrock was selected as the preferred system with rock support improvement for the southwest wing. Available options for rock mass stabilization for shallow foundation support were evaluated and Limited Mobility Displacement (LMD) grouting was selected to achieve the intended improvement. The LMD grout treatment area was designed for effective distribution of bearing stresses into the underlying rock mass. The designed system permits stress distribution for a 6 m thick grouting zone. Perimeter grout lines were established and primary and secondary grout holes were placed along each grout line. Supplementary injections were added to attain improved coverage in the treatment area. The injection sequence was designed from the outermost line inward towards the center of the foundation. The grout material was selected as a homogeneous mixture containing water, cement, and fine aggregate, plus mineral filler, and water reducing agent with a maximum slump of 50 mm and a minimum 28-day compressive strength of 10.3 MPa. Pre-production injection testing program was also developed to verify pumping rate, grout mix design, and refusal.
Limited Mobility Displacement Grouting Design for Foundation Bearing Improvement
Subsurface investigation for the replacement of Tatamy Bridge over Bushkill Creek in Northampton County, Pennsylvania showed evidence of extensive solution activity within the dolomite bedrock underlying the proposed southwest wing. Test borings revealed a shallow top of rock profile over the wing area and alternating solution zones extending well inside the rock strata. A rigorous alternatives analysis was initiated to determine the preferred foundation system to support the southwest wing. Based on the analysis of subsurface data, deep foundation systems that derive resistance from skin friction were eliminated from consideration. Spread footing on bedrock was selected as the preferred system with rock support improvement for the southwest wing. Available options for rock mass stabilization for shallow foundation support were evaluated and Limited Mobility Displacement (LMD) grouting was selected to achieve the intended improvement. The LMD grout treatment area was designed for effective distribution of bearing stresses into the underlying rock mass. The designed system permits stress distribution for a 6 m thick grouting zone. Perimeter grout lines were established and primary and secondary grout holes were placed along each grout line. Supplementary injections were added to attain improved coverage in the treatment area. The injection sequence was designed from the outermost line inward towards the center of the foundation. The grout material was selected as a homogeneous mixture containing water, cement, and fine aggregate, plus mineral filler, and water reducing agent with a maximum slump of 50 mm and a minimum 28-day compressive strength of 10.3 MPa. Pre-production injection testing program was also developed to verify pumping rate, grout mix design, and refusal.
Limited Mobility Displacement Grouting Design for Foundation Bearing Improvement
Haider, Tarek F. (Autor:in) / Kufro, Christopher J. (Autor:in) / Rahman, Mohd F. (Autor:in)
Proceedings of the Fourth International Conference on Grouting and Deep Mixing ; 2012 ; New Orleans, Louisiana, United States
Grouting and Deep Mixing 2012 ; 1634-1643
17.08.2012
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Piles , Mixing , Grouting , Highways and roads , Chemical grouting , Anchors , Cement , Foundations , Pennsylvania , Cutoffs , Displacement , Hydraulic structures
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