Page 85 - 捷運技術 第41期

捷運技術半年刊 第41 期 79

於液化地層潛盾鑽掘工程之施工管理與防治

－以蘆洲線 CL804 標為例

ᄎτᅃ

摘 要
ઠ༶ᘻݲᇞ҈၌௅ʱᆑ޷ݬʿᘻݲዚᅀdΪڐ૱˥ئdήሯᕦழd຾ήሯ᝝ઞഐ؈ᜑͪ

௅ʱਜਹήڌɨߒ6ʮˉЇ20ʮˉϞ༰ێʘ४ɺሯ޻ᄴd׵௰ɽήቤɢЪ͜ɨd૰ʷᆑঐხ
৷dΪϾც׵΢ʔΝഐ࿴᜗dணࠇe݄Ъ΢ධԣط૰ʷʈ೻f̤௅ʱਜਹϘϋڷΫ෬չѫʘ
ɺᄴdՉЗໄ(GL-7ä-8ʮˉ)ଉ૵ʔɓ˲ڢѩʴʱбd˲͉ਜਹɺᘎˆქଟ৷d׸ΪաᏚᏀ
ߧήᄴᠧጐᄌडᜊʷfΪϤdᆑ޷᝝ઢࣛd׸ΪήᆵˀɢʔԑdԴ੻ܝ˙ᐑ˪ዑΣ୅ਗdପ

͛׵ϜᇞݬೌجԱணࠇᇞҖᔷᛃʘତ൥d̤Ϊᔧɺ༰૵dৰዑΣˀɢ̮dɨਉˀɢ͵ʔԑd
ኬߧᆑ޷ዚৰೌجᔷᛃ̮d͵ପ͛ɨ௘ତ൥fΪϤʔሞ׵݄ʈ၍ଣא૰ʷԣطɪѩცฐ੗Ͻ
ඎԨમБεධણ݄֐ঐනлҁϓ͉ධʈ೻ԨӁഒဧܝ૰ʷᆑঐʘΚ࢔f
ᗫᒟ൚j૰ʷᆑঐe௰ɽήቤɢeɺᘎˆქଟeઠ༶ᘻݲᇞ

Management and Prevention of Liquefied Stratum in Shield-tunnel Excavation
—Taking the Luzhou Line Contract CL804 as an Example

Liu,An-de
Abstract

The end section of the shield-tunnel of the Luzhou line and Luzhou Depot is near the Danshui
River. Geological drilling results showed there is a deep layer of powder sand 6-20 meters below
the ground surface layer, causing a high potential of liquefaction under the action of powerful
seismic forces. As a result, it was necessary to design and construct various anti-liquefaction
measures for different structures.
In addition, a part of the area contained refuse backfill soil with a non-uniform distribution
located 7-8 meters underground. On top of that, due to the high rate of soil porosity in the region,
the nature of the stratum is subject to suffering violent change caused by pression. Therefore,
during shield tunnel excavation, a lack of ground reaction force caused rear segments of the shield
tunneling machine to move transversely, generating a phenomenon that the tunneling machine
cannot make a turn in accordance with its design. In addition, another result of the shallow layer
of surface soil, in addition to horizontal reaction force, underside reactions were also inadequate,
making turning of the shield tunneling machine impossible. It also produced the phenomenon of
subsidence. Therefore, careful consideration regarding construction management and liquefaction
prevention as well as taking related measures are necessary to eliminate any potential harm caused
by liquefaction.
Keywords: potential of liquefaction、powerful seismic forces、soil porosity 、Luzhou line

ၽִ̹̏݁ઠ༶ʈ೻҅ʕਜʈ೻ஈɺ˝ୋʬʈਕה˴΂ccccx1018190@trts.dorts.gov.tw