土工袋挡土墙小型振动台试验
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国家自然科学基金面上项目(51379066);江苏高校优势学科建设工程资助项目(YS11001)


Small-scale shaking table tests on retaining wall constructed with soilbags
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    摘要:

    通过小型振动台试验,研究了以天然河沙为填料的土工袋挡土墙在水平向不同振动加速度下的位移、动土压力以及水平加速度的分布规律,并与水平加筋土挡土墙和传统的刚性挡土墙进行了对比分析。结果表明,输入加速度不超过0.3g时,土工袋挡土墙位移变形比刚性挡土墙略大,但是随着输入加速度继续增大,刚性挡土墙发生整体滑移,以致倾覆破坏,而土工袋挡土墙依然稳定,显示出良好的抗震性能。水平加筋土挡土墙的位移一直大于土工袋挡土墙与刚性挡土墙,峰值出现在1/2倍墙高处,且随着输入加速度的增大,挡土墙中上部外凸变形越来越显著;土工袋挡土墙的动土压力系数与墙体位移相对应,沿墙高呈非线性分布,中上部较大、下部较小;土工袋挡土墙的加速度放大倍数随着输入加速度和墙高的增大而增大,均小于水平加筋土挡土墙与刚性挡土墙。同时,针对土工袋挡土墙的破坏失稳模式,对顶部进行加筋处理,可以进一步提高土工袋挡土墙的抗震性能。

    Abstract:

    The distribution patterns of horizontal displacements, dynamic earth pressures, and horizontal accelerations of retaining walls constructed with soilbags filled with natural river sand under different horizontal vibration accelerations were investigated through small-scale shaking table tests, and they were compared with those of retaining walls reinforced with horizontal woven geotextiles and traditional rigid retaining walls under the same horizontal vibration accelerations. The results show that, when the input acceleration is not more than 0. 3g, the displacement of the retaining wall constructed with soilbags is slightly larger than that of the rigid retaining wall. With the increase of the input acceleration, slippage of the entire rigid retaining wall occurs, and then overturning failure occurs, while the retaining wall constructed with soilbags can still remain stable, showing a good seismic performance. The displacement of the retaining wall reinforced with horizontal woven geotextiles, with a maximum value at half of the wall height, is always larger than those of the retaining wall constructed with soilbags and the rigid retaining wall, and the convex deformation of the upper part of the retaining wall reinforced with horizontal woven geotextiles is more significant with the increase of the input acceleration. Dynamic earth pressure coefficients of retaining walls show a nonlinear distribution along the wall height, with larger values in the upper part of retaining walls and smaller values in the lower part. With the increase of the input acceleration and wall height, the horizontal acceleration amplification ratio of the retaining wall constructed with soilbags increases, and is slightly lower than those of the retaining wall reinforced with horizontal woven geotextiles and the rigid retaining wall. According to failure and instability modes of retaining walls constructed with soilbags, the seismic performance of retaining walls constructed with soilbags can be improved greatly through reinforcement of some soilbags at top layers with geotextiles.

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刘斯宏,李玲君,张雨灼,等.土工袋挡土墙小型振动台试验[J].河海大学学报(自然科学版),2015,43(3):236-243.(LIU Sihong, LI Lingjun, ZHANG Yuzhuo, et al. Small-scale shaking table tests on retaining wall constructed with soilbags[J]. Journal of Hohai University (Natural Sciences),2015,43(3):236-243.(in Chinese))

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  • 收稿日期:2014-09-03
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  • 在线发布日期: 2015-06-01
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