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Seismic stability of urban tunnels in shallow depth

城市浅埋隧道地震稳定性

基本信息

批准号：
17206050
负责人：
KUSAKABE Osamu
金额：
$ 31.2万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17206050/
关键词：
Structural Engineering Earthquake Geotechnical Engineering 都市トンネル耐震性

项目摘要

This paper presented some results of active type shear tests in a centrifuge by modeling a semi-circular aluminum tunnel in dry silica sand and in cemented model ground to understand the effects of stress releasing on seismic stability of NATM tunnel. According to the results, the following findings were obtained.1) Before shearing, in the sand ground the earth pressure acting on the tunnel crown was close to Terzaghi's loosening earth pressure and smaller than the theoretical calculated overburden pressure by the following equation.ρ_r=ρ_v+ρ_h/2-ρ_v-ρ_h/2cos2θ2) Before shearing, in the cemented sand ground with stress releasing the bending moment distribution of the tunnel lining was similar to the calculated values by elastic calculations of beam structure applied Terzaghi's loosening earth pressure, however in the case of no stress releasing the bending moment distribution of the tunnel lining was similar to the calculated values by elastic calculations of beam structure applied the … More oretically calculated overburden pressure.3) Looseness of the ground over the tunnel had deteriorated by shearing in cases of sand ground, and the earth pressure acting on the tunnel lining close to theoretically calculated distribution.4) Whereas in the sand ground and the bending moment distribution shows no change, in the cemented ground with stress releasing the bending moment distribution of the tunnel increase after first shearing. This indicates that there are different mechanisms of earth pressure increments due to arching effect of the ground dissipate between sand ground as non-consolidated ground and cemented sand as cemented soft ground.In the cemented sand ground, stress releasing also affects to the increment of bending moment due to shearing. Increment of bending moment distribution of allowed stress releasing case is larger compared with the other cases. However, in absolute values considered with initial value, bending moment during earthquakes is relatively smaller than the other cases. Less

本文介绍了一个半圆形铝合金隧道在干石英砂和水泥模型地面中的离心机主动式剪切试验的一些结果，以了解应力释放对新奥法隧道的地震稳定性的影响。结果表明：（1）剪切前，砂土地层中作用在隧道拱顶上的土压力接近太沙基松动土压力，小于理论计算的上覆土压力：ρ_r=ρ_v+ρ_h/2-ρ_v-ρ_h/2cos 2 θ2）剪切前，在有应力释放的胶结砂土地基中，隧道衬砌的弯矩分布与太沙基松动土压力作用下梁式结构弹性计算值相似，而在无应力释放的情况下，隧道衬砌的弯矩分布与梁结构弹性计算的结果相似， ...更多信息 3）砂土地基下隧道围岩松动度受剪切作用恶化，作用在隧道衬砌上的土压力分布接近理论计算值; 4）砂土地基下隧道围岩弯矩分布无明显变化，而水泥土地基下应力释放后隧道围岩弯矩分布在第一次剪切后有所增加。这表明，砂土地基作为非固结地基与胶结砂土地基作为胶结软土地基，由于地基消散的耗散效应而引起的土压力增量有不同的机理，在胶结砂土地基中，应力释放对剪切弯矩增量也有影响。允许应力释放工况的弯矩分布增量较大。但是，在考虑初始值的绝对值中，地震时的弯矩相对小于其他情况。少

项目成果

期刊论文数量（19）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Centrifuge modeling on seismic behavior of rectangular tunnels

DOI：
10.1201/noe0415415866.ch171
发表时间：
2006-07
期刊：
影响因子：
0
作者：
T. Yamada;J. Izawa;H. Nagatani;N. Ohbo;O. Kusakabe
通讯作者：
T. Yamada;J. Izawa;H. Nagatani;N. Ohbo;O. Kusakabe

Effect of earth pressure on seismic stability of tunnel

土压力对隧道地震稳定性的影响

DOI：
发表时间：
2006
期刊：
Proc. of 12th Japan Earthquake Engineering Symposium No. 161(CD-ROM)
影响因子：
0
作者：
J.;Izawa;J.;Takemura;S.;Shibayama;O.;Kusakabe
通讯作者：
Kusakabe

Seismic Stability of Rectangular Tunnels with

矩形隧道的地震稳定性

DOI：
发表时间：
2007
期刊：
countermeasures, Proc. of 4th International Conference on Urban Earthquake Engineering
影响因子：
0
作者：
Jun;Izawa;Osamu;Kusakabe;H.;Nagatani;T.;Yamada;N.;Ohbo
通讯作者：
Ohbo

トンネルの地震時安定性に及ぼす土圧の影響に関する遠心模型実験

土压力对隧道地震稳定性影响的离心模型试验