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占鑫杰, 李文炜, 杨守华, 朱群峰, 许小龙, 黄慧兴. 强夯法加固堰塞坝料的室内模型试验研究[J]. 岩土工程学报, 2023, 45(5): 953-963. DOI: 10.11779/CJGE20220198
引用本文: 占鑫杰, 李文炜, 杨守华, 朱群峰, 许小龙, 黄慧兴. 强夯法加固堰塞坝料的室内模型试验研究[J]. 岩土工程学报, 2023, 45(5): 953-963. DOI: 10.11779/CJGE20220198
ZHAN Xinjie, LI Wenwei, YANG Shouhua, ZHU Qunfeng, XU Xiaolong, HUANG Huixing. Model tests on landslide dam materials improved by dynamic compaction[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(5): 953-963. DOI: 10.11779/CJGE20220198
Citation: ZHAN Xinjie, LI Wenwei, YANG Shouhua, ZHU Qunfeng, XU Xiaolong, HUANG Huixing. Model tests on landslide dam materials improved by dynamic compaction[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(5): 953-963. DOI: 10.11779/CJGE20220198

强夯法加固堰塞坝料的室内模型试验研究

Model tests on landslide dam materials improved by dynamic compaction

  • 摘要: 为丰富堰塞坝开发利用理论,指导堰塞坝浅层密实加固处理工程,基于相似定律对堰塞坝料进行了不同能级的室内强夯模型试验,综合采用宏-细观方法分析了强夯能量引起的动应力发展和传播规律、内部变形规律、颗粒破碎和加固效果等。试验结果表明:随着夯击次数增加,由于堰塞坝料密实度提高、颗粒重排列、破碎及填充的叠合效应,夯锤有效加固范围内的动土压力峰值整体呈波动上升趋势。强夯过程中能量逐渐从表层传递到深层,同时强夯能量随深度具有较大的耗散,动应力峰值随深度呈现快速衰减的趋势。由于风化严重,强夯引起了明显的颗粒破碎现象。强夯对松散宽级配堰塞坝料的加固效果明显,不同能级强夯后其锥尖阻力大幅提高,但夯击能超过一定数值时,增大夯击能对加固效果提升有限。基于本次易贡堰塞坝料模型试验,最佳夯击能约为6000 kN·m。

     

    Abstract: In order to enrich the development and utilization theories of landslide dams and guide the shallow compaction reinforcement projects, based on the similarity law, the dynamic compaction model tests on landslide dam materials with different energy levels are carried out, and the development and propagation law of dynamic stress caused by dynamic compaction energy, the displacement characteristics as well as the particle breakage and reinforcement effects are analyzed by using the macro-meso-method. The test results show that with the increasing tamping times, the peak value of dynamic pressure within the effective reinforcement range of the rammer exhibits a fluctuating upward trend as a whole due to the increasing compactness of landslide dam materials and the superposition effects of particle breakage, rearrangement and filling. During the process of dynamic compaction, the energy is transferred from the surface one to the deep layer gradually. Meanwhile, the energy dissipates greatly with the depth, and the peak value of dynamic stress decreases rapidly with the depth. Due to severe weathering, obvious particle breakage is caused by the dynamic compaction. The reinforcement effects of the dynamic compaction is obvious for loose- and wide-graded landslide dam materials. The cone tip resistance of the dynamic compaction with different energy levels greatly increases, but the reinforcement effects are limited by increasing the tamping energy when it exceeds a certain value. Based on the model tests on the Yigong landslide dam materials, the best tamping energy is about 6000 kN·m.

     

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