关键词: 地铁, 盾构, 交叠隧道, 沉降槽, 分层沉降, 沉降预测

Abstract:

It is very important to learn the rules of ground settlement induced by shield tunneling in Beijing area. Ground settlement monitoring crosssections are set on parallel section and overlapped section of doubleline shield tunnel respectively, so as to study the rules of ground settlement induced by shield tunneling. The analytical results show that: 1) The curves of settlement groove in different depths of ground in Beijing area can be described by Gaussian distribution; the width of settlement groove decreases with the depth of ground increase. 2) The ground settlement before shield reaches monitoring crosssection,after shield reaches the point away from monitoring crosssection equals to tunnel buried depth and later ground settlement takes 1/3 of total settlement respectively. 3) For overlapped tunnel, the lower tunnel should be constructed firstly. 4) The relevant ground losses of settlement groove with different depths are almost the same. 5) Larger ground settlement would be induced by shield stop.

Key words: Metro, shield, overlapped tunnel, settlement groove, ground layered settlement, settlement prediction