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地震作用下斜坡堆积体的变形规律

, PP. 50-54

Keywords: 道路工程,堆积层斜坡,测斜监测,同震响应,时效变形

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Abstract:

以距2008年攀枝花6.1级地震震中约9.7km的攀田高速公路望江岭隧道田房端出口斜坡堆积体为研究对象,在连续的现场测斜监测数据的基础上,探讨了地震前、后斜坡堆积体的变形特性及其随时间的演进规律。结果表明各测孔同震顺坡向位移最大值为26~28mm,并沿深度近似呈逐渐减小分布;J3、J5测孔附近岩土体时效变形于震后约300d达到峰值,而后逐渐稳定;至震后约430d,由于坡体内、外界综合因素影响,J1孔顺坡向位移仍处于调整状态。综合现场监测成果,可以认为,在经历了大约1a的自适应调整,特别是经2009年雨季后,斜坡堆积体已处于整体稳定状态。

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