| 不同地质条件下隧道洞口仰坡地震破坏特性研究 |
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| 引用本文： | 王帅帅,高波,隋传毅,闻毓民.不同地质条件下隧道洞口仰坡地震破坏特性研究[J].岩土力学,2014,35(Z1):278-284. |
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| 作者姓名： | 王帅帅 高波 隋传毅 闻毓民 |
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| 作者单位： | 西南交通大学 交通隧道工程教育部重点实验室，成都 610031 |
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| 基金项目： | 国家自然科学基金资助(No.51178398)。 |
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| 摘 要： | 针对洞口段均质围岩仰坡、含软弱夹层仰坡和桁架梁加固仰坡围岩3种工况,开展大型振动台模型试验,分析隧道洞口段仰坡模型土破坏形态。试验结果表明,均质边坡洞口段模型土在动力作用下坡肩土体先出现张拉裂缝,随着激振加速度增加,坡肩土体局部出现倾倒崩塌,最后沿坡面滑落堆积;含软弱夹层边坡在地震力作用下,仰坡坡脚部位土体挤压破碎,坡顶表面沿软弱夹层位置出现张拉裂缝,上覆土体沿软弱夹层滑动,最后土体大规模崩塌、滑落;洞口段加固边坡在动力作用下基本保持整体稳定,只部分梁格出现了局部的掉块,模型土顶部出现沿隧道轴向的细微裂缝。分析了隧道洞口段衬砌结构破坏形态,试验结果表明均质边坡洞口段AB两段衬砌模型裂缝分布较CD段复杂,认为洞口段地震影响深度为AB两段衬砌的长度,对应于实际工程中40 m;受软弱夹层影响,跨软弱夹层部衬砌模型裂缝形态较复杂;仰坡加固后,洞口段衬砌模型受力改善。研究结果可为山岭隧道洞口段边坡抗减震研究和设计提供参考。
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| 关 键 词： | 隧道洞口段 仰坡 衬砌 破坏形态 振动台试验 |
| 收稿时间： | 2013-10-18 |
Shaking table test for seismic behavior of upward slope at tunnel entrance in different geological conditions |
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| WANG Shuai-shuai
,
GAO BO
,
SUI Chuan-yi
,
WEN Yu-min.Shaking table test for seismic behavior of upward slope at tunnel entrance in different geological conditions[J].Rock and Soil Mechanics,2014,35(Z1):278-284. |
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| Authors: | WANG Shuai-shuai GAO BO SUI Chuan-yi WEN Yu-min |
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| Institution: | Key Laboratory of Transportation Tunnel Engineering of Education Ministry, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | By consulting domestic seismic study on tunnel entrance, large scaled shaking table model tests of the entrance on homogeneous upward slope, slope with weak intercalation and strengthened slope were carried out in laboratory. General conclusions were obtained through analyzing the failure modes of the upward slopes. Under the earthquake, tension cracks appeared first at the shoulder of the slope, with the excitation acceleration increasing, soil at the shoulder started to dump and collapse; when introducing the weak intercalation, the soil at the toe of slope was squeezed broken firstly, tension cracks of the surface appeared at the weak interlayer positions, overlying soil sliding along the weak interlayer and leads to large-scaled soil collapse; the strengthened slope remained stable under the action of the force, only caused partial soil failure; minor axial cracks appeared at top. By analyzing the tunnel structure failure, the test results show that the fracture distribution on the A and B linings of tunnel portal are more complex than that on C and D linings; the total length can be taken as the earthquake affect length, which corresponds to 40m at the actual project. Affected by the weak interlayer, the fracture of the lining parts crossed the weak interlayer are more complex than others; the slope reinforcement can improve the stress state of both the slope and portal structure. These conclusions can be for reference in design and construction of tunnel under earth quake. |
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| Keywords: | entrance of tunnel upward slope linings fracture characteristics shaking table tests |
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