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不良地质下偏压隧道支护结构开裂与治理分析

ISSN号：1000-1433
期刊名称：《工程勘察》
时间：0
分类：U45[建筑科学—桥梁与隧道工程;交通运输工程—道路与铁道工程]
作者机构：[1]重庆大学土木工程学院,重庆400045, [2]河北工程技术高等专科学校,河北沧州061001
相关基金：国家自然科学基金创新群体基金（50621403）.

作者：刘新荣[1], 郭子红[1], 谢应坤[1], 舒志乐[1], 宋兴海[2]

关键词：不良地质, 偏压隧道, 裂缝, 数值分析, unfavorable geological condition, asymmetrically loaded tunnel, crack, numerical analysis

中文摘要：

隧道支护结构开裂现象是工程界普遍关注的课题，根据工程实例，采用现场监控量测资料阐述了明洞与支护开裂的位置，结合隧道的周边位移和拱项下沉随时间和施工进度的变化趋势，得出不良地质情况和严重偏压是明洞与支护开裂的主要原因。依据现场处理措施得出施作仰拱和对隧道埋深较浅侧进行小导管注浆加固能有效地抑制支护结构裂纹发展。采用变分方法与Bishop条分法相结合定性分析得出偏压隧道薄弱部位及产生偏压的原因。通过数值分析获得明洞的第一主应力分布状态，解释裂缝出现于拱项与偏压侧拱肩之间的原因；数值分析获得的隧道周边位移和拱顶下沉与现场监测结果具有相同的发展趋势；断面离隧道洞口越近，周边位移向外扩展值越大，表明洞口处为隧道最薄弱部位。

英文摘要：

The cracking of tunnel support structure is an attention issue in engineering field. Based on the engineering examples and site monitoring measurement, the cracking positions of the open cut tunnel and the support structure are illuminated. According to the variation trend of the tunnel border displacement and the vault settlement, the main reasons that cause the cracks of the tunnel and the structure are the unfavorable geological conditions and the unsymmetrical loads. On the field treatment effect, to set tunnel invert and to grout in the shallow soil of tunnel with ductules could restrain the development of the cracks. With variation method and Bishop slice method, the weak parts of the tunnel and the reasons caused the unsymmetrical loads are obtained. Through the numerical analysis the distribution state of the first principal stress on the open cut tunnel is achieved, which explains the reasons of the cracks appeared between the vault and the spandrel at the asymmetrical load side. The border displacement of the tunnel and the vault settlement from the numerical analysis are accorded with the results from site monitoring measurement. The section is closer to the tunnel portal, the larger the extending value of the border displacement is, which indicate that the tunnel portal is the weakest part.

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