Husam Al-Alusi

 

Education and Qualifications

• MSc in Civil Engineering, 1979 Bradford University, UK

• BSc in Civil Engineering, 1977 University of Baghdad, Iraq

Career Summary

• Chief Engineer, The Pressure Grout Co. , 1993 to Present

• Geotechnical Engineer Consultant, 1989-1992

• Construction Manager, 1986-1988

• Engineer/ Project Manager Heavy Civil Engineering and Infrastructure Projects, 1980- 1985


Key experience

• Seismic Upgrade of Existing Structures

• Interpretation of Geotechnical Data

• Forensic Engineering

• Prepare Ground Improvements Specifications

• Ground Improvement Methods

• Liquefaction Assessments and Mitigation

• Design and Installation of Micropiles


Selected Professional History

Seismic upgrading for old buildings, California, USA

Compaction and/or Permeation Grouting were used to densify the foundation soils for liquefaction abatement. The challenges here were the restrictive access and age of the buildings, which made them vulnerable to movements caused by the compaction grout densification. To minimize the effect of compaction grouting, and provide the most cost effective method of improvement, permeation grouting (relatively low pressure and liquid material) was used to improve the upper few feet. The selection of the thickness of the layer treated by permeation grouting instead of compaction grouting is the key here, permeation layer should be thick enough to allow the drop of compaction grouting pressure to a level, where it would not affect the building, and at the same time permeation grouting should be kept to the minimum to be cost effective.

Installing grout curtain at a Dam, in Morgan hill, California

This project involved relatively deep drilling (150 feet deep holes, ~45 meters), to install a grout curtain to reduce water permeability of the dam and soils below the body of the dam, using ultrafine cement grouting. The process included drilling, pressure water testing, grouting and performing materials quality control tests on site. Grout mix design was one of the most important issues in the project, the grout mix had to be changed many times through the day to adapt to the rock fissure sizes and permeability of the layer being grouted.

Airport Runway grouting, Sacramento, California

The airport runway was having rocking slabs issues in the landing area due to presence of voids below the concrete slabs. The owner decided to fill these voids with grout. The challenge was the airport has to stay in operation, so the grout mix design was at the core of this operation, the grout has to be pumpable, yet it has to develop enough strength to allow planes landing after two hours from grout installation, another important issue was designing and implement a high precision monitoring system to avoid any runway slab movement, this also necessitate a modification to grout pumping system and the return to maintain stable pumping pressure.

Seismic upgrading for energy plant, Orting, Washington

Compaction grout densification was used to densify the soils to 30 feet below surface. Due to having equipment in the work area, the design of the grout injections locations needed to be carefully planned to avoid affecting the equipment or the operation, while providing the required improvement for the whole area.

Seismic upgrade for Fisherman’s wharf, San Francisco, California

This project is one of the major compaction grouting project in North California. The upper soil layer was fill/hydraulic fill underlain by soft “Bay Mud” (unconsolidated clays), the objective was densifying the sandy fill layer for liquefaction abatement and lateral spreading mitigation.

Compaction Grout Densification, Hugoton Bioenergy Plant, Hugoton, Kansas

This is another large-scale project utilizes compaction grouting for improving bearing capacity and settlement reduction for large, heavily loaded concrete tanks each of 20 m diameter & 15 m high. Foundation soils were improved to a depth of 15 m. The grouting injections layout, grout pressures, and stoppage criteria were designed to meet the project objective of maximum differential settlement of 25 mm. CPeT-IT V 1.7 by GeoLogismiki was used to predict settlement of the soils for before and after grouting. The predicted settlement came in a very good agreement with the actual settlement as measured about a year and a half, after construction completion and fully loading the tanks.

Grouting to lift bridge approach slabs at Freeway 50, Sacramento, California

This work required a high precision lifting for the bridge approach slabs to match the bridge slab elevation. Movement monitoring was carried out using highly sensitive dial gauges mounted on rigid aluminum beam