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2024年4月26日发(作者：)
毕业设计（论文）外文文献翻译
院 系： 土木工程与建筑系
土木工程
年级专业：
姓
名：
号：
件：
学
附
盾构
SHIELDS
指
导老师评语：
指导教师签名：
年 月
日
S HIEL DS
【Abstr act】A tunnel shield is a structural system, used during the face excavation process.
The paper mainly discusses the form and the structure of the shield. Propulsion
for the
shield is provided by a series of hydraulic jacks installed in the tail of the shield
and the
shield is widespread used in the underground environment where can not be in long time
stable. The main enemy of the shield is ground pressure. Non-uniform ground
pressure
caused by the steering may act on the skin tends to force the shield off line and
grade.
And working decks inside the shield enable the miners to excavate the face, drill and
load holes.
【Keywor ds】shield hydraulic jacks ground pressure steering working decks
A tunnel shield is a structural system, normally constructed of steel, used during
the face excavation process. The shield has an outside configuration which matches the
tunnel. The shield provides protection for the men and equipment and also furnished
initial ground support until structural supports can be installed within the tail section of
the shield. The shield also provides a reaction base for the breast-board system used to
control face movement. The shield may have either an open or closed bottom. In a
closed-
bottom shield, the shield structure and skin provide 360-degree ground contact and the
weight of the shield rests upon the invert section of the shield skin. The open
shield has no
bottom section and requires some additional provision is a pair of side drifts driven in
advance of shield excavation. Rails or skid tracks are installed within
these side drifts to
provide bearing support for the shield.
Shield length generally varies from1/2 to 3/4 of the tunnel diameter. The front of
the shield is generally hooded to so that the top of the shield protrudes forward further
than the invert portion which provides additional protection for the men working at the
face and also ease pressure on the breast-boards. The steel skin of the shield may vary
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