李彰明, 赖建坤, 李正东, 罗智斌, 胡新丽. 2017: 不同竖向排水体下淤泥地基冲击能传递规律模型试验研究. 工程地质学报, 25(1): 27-35. DOI: 10.13544/j.cnki.jeg.2017.01.004
    引用本文: 李彰明, 赖建坤, 李正东, 罗智斌, 胡新丽. 2017: 不同竖向排水体下淤泥地基冲击能传递规律模型试验研究. 工程地质学报, 25(1): 27-35. DOI: 10.13544/j.cnki.jeg.2017.01.004
    LI Zhangming, LAI Jiankun, LI Zhengdong, LUO Zhibin, HU Xinli. 2017: EXPERIMENTAL STUDY OF ENERGY TRANSFERRING LAW OF MUCK SOIL WITH DIFFERENT DRAINAGE SYSTEMS UNDER HIGH ENERGY IMPACT. JOURNAL OF ENGINEERING GEOLOGY, 25(1): 27-35. DOI: 10.13544/j.cnki.jeg.2017.01.004
    Citation: LI Zhangming, LAI Jiankun, LI Zhengdong, LUO Zhibin, HU Xinli. 2017: EXPERIMENTAL STUDY OF ENERGY TRANSFERRING LAW OF MUCK SOIL WITH DIFFERENT DRAINAGE SYSTEMS UNDER HIGH ENERGY IMPACT. JOURNAL OF ENGINEERING GEOLOGY, 25(1): 27-35. DOI: 10.13544/j.cnki.jeg.2017.01.004

    不同竖向排水体下淤泥地基冲击能传递规律模型试验研究

    EXPERIMENTAL STUDY OF ENERGY TRANSFERRING LAW OF MUCK SOIL WITH DIFFERENT DRAINAGE SYSTEMS UNDER HIGH ENERGY IMPACT

    • 摘要: 静动力排水固结法中,土体固结效果与排水体间距有很大关系。为研究高能量冲击下不同排水体间距设置对软土能量传递规律影响,利用多向高能高速电磁力冲击智能控制试验系统,在模型箱中设置多组不同排水体系,对淤泥土进行静动力排水固结模型试验(1:30相似比),获得了高能量多遍冲击作用下不同排水体系中能量传递规律:(1)冲击荷载作用下,非插板(无人工排水体)区产生的孔压难以消散、附加应力难以沿埋深方向往下传递,而插板区则可,但其传递需要经历一定夯击遍数;插板较密区比插板较疏区的孔压更易消散,其工中沉降更大;(2)插板区软土层是由上至下逐步加固的;插板越密,随着夯击遍数增加,能量在软基深层分布的比例越大,且深层最终能量增量占处理厚度总能量的分布比例最大,表现出主要压缩区向下移动趋势更为明显。试验表明,排水体设置是必要的;在给定条件下,插板越密,越有利于地基深部的加固。上述结果的重要工程意义在于,当施加足够遍数的夯击且设置相适应的排水体时,对于淤泥类高含水量软土地基,运用静动力排水固结法,可加固深厚淤泥地基。

       

      Abstract: In static-dynamic drainage consolidation method, the soil consolidation effect is strongly related to drainage body spacing. This paper studies the effect of different drainage body spacing on the energy transfer processes of soft soil under high-energy impacts. Static-dynamic consolidation model tests (1:30 similarity ratio) are performed on the muck soil where different drainage systems are installed using a self-developed high-energy electromagnetic impact testing system. The energy transferring processes in different drainage systems are characterized under repeated high-energy impacts. The experimental results show the follows. (1) The pore pressure in non-plastic drainage board(non-artificial vertical drains) area is hardly to disperse under impact load. Additional soil pressure is difficult to pass down along the depth direction. The board area can be, but the pass down needs to undergo certain impact passes. The pore pressure more easily dissipates. Larger settlement more easily takes place in the vertical drains dense area. (2) Soft soil in drain area is top-down gradually reinforced. The more dense drains, as the number of impact passes increase, the greater the proportion of the energy distribution in the deep soft ground, and the proportion becomes the largest in final impact. More obvious trend of the main compression zone moving downward is shown. Those results show that drainage setting is necessary, but should maintain a reasonable density. Under given conditions, the drains more dense, more conducive to strengthening the deep ground soil. Its important engineering significance is that the deep muck soil ground can be strengthened when impact applying sufficient number of times and with suitable drains, by using static-dynamic drainage consolidation method. The finding provides the basis for optimization of design and construction for high water content soft soil ground, and how to meet the reinforcement depth requirement as well.

       

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