关于汪永贤博士学术讲座的通知

主讲人简介：

A principal consultant with Mitic Associates since early 1998, Dr. Wong is a registered professional engineer with over 40 years of experience in the field of geotechnical and civil engineering.  This experience extends over a wide range of civil engineering facil­ities. He obtained a BSc degree in Civil Engineering with First Class Honours at Imperial College,  and his master’s and doctorate degrees in geotechnical engineering from the Massachusetts Institute of Technology. He was head of the geotechnical services department at Ebasco Services Inc in New York and project manager and technical consultant at Dames and Moore in New Jersey, and also an Adjunct Professor in Civil Engineering at Columbia University and at Polytechnic University, both in New York. Dr Wong also taught at the former University of Singapore and at Nanyang Technological University.

Dr Wong was a geotechnical consultant on a large number of projects involving deep excavations, underpinning of old buildings, highways, mass rapid transit, wharves, waterfront structures, high-rise buildings, refineries, tank farms, power plants, dams, wastewater treatment plants and ocean outfalls.

Dr Wong has worked on projects located in the United States, Canada, the Middle East, Singapore, Malaysia, Brunei, Myanmar, Indonesia, India, China, Taiwan, Greece, Panama and the Caribbean islands.

Dr Wong is a Year 2000 winner of the Thomas A Middlebrooks Award from the American Society of Civil Engineers.

报告简介：

The final excavation for the proposed mass rapid transit Circle Line was going to be 34m deep, with ten levels of steel struts. The retaining walls consisted of 800mm thick diaphragm walls. The soils consisted of 3 to 6m m of recent sand fill underlain by marine clay that iextended to a depth of 28m on the north side and 37m on the south side. Two layers of 3m thick jet grout were installed. The top jet grout layer was sacrificial, namely it was removed when the excavation reached past it.

On April 20, 2004, when the excavation was 30m deep, the deflection of the diaphragm wall on the south side reached 460mm and the excavation collapsed. Four workers were killed.

An official investigation was launched by the government of Singapore.  Six teams of experts and lawyers participated in the investigation.

The events leading to the collapse will be discussed in the lecture. The causes of the collapse will be presented.