护盾
岩土工程
地质学
量子隧道
材料科学
岩石学
光电子学
作者
G. Wayne Clough,Bryan P. Sweeney,Richard J. Finno
出处
期刊:Journal of Geotechnical Engineering
[American Society of Civil Engineers]
日期:1983-12-01
卷期号:109 (2): 131-149
被引量:49
标识
DOI:10.1061/(asce)0733-9410(1983)109:2(131)
摘要
The first earth pressure balance (EPB) shield project in the United States, a 3,000 ft (915 m) long, 12.1 ft (3.7 m) diameter, tunnel is described. It is located in San Francisco and passes beneath a heavily trafficked commercial area known as Fisherman's Wharf. The soil profile consists of 20 ft (6.1 m) of rubble fill which overlies a 30 ft (9.1 m) layer of Bay Mud. A colluvium layer underlies the Bay Mud. The tunnel section is located within the Bay Mud, and has a cover of approximately 30 ft (9.1 m); water heads above the crown are typically 15 ft (4.5 m). The EPB shield was designed to deal with these difficult ground conditions without the use of compressed air or dewatering, and to cut through numerous abandoned wooden piles along the route. Surface and sub‐surface ground movements were monitored along the alignment during and after shield passage. The shield was found to initially heave the soil aside slightly as the face passed, but movements thereafter were towards the tunnel. Settlements were ty...
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