气囊增压联合堆载加固冲填土地基模型试验研究

doi:10.13722/j.cnki.jrme.2019.0878

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摘要基于模型试验对冲填土地基在内部竖向气囊施加的侧向压力联合上部堆载的作用下产生的沉降固结进行分析研究。研究结果显示：气囊的侧向力对提高土体的固结度有明显的作用，在总固结时间为180 h时，气囊增压联合堆载实验的固结度达到82.75%，高于堆载实验的75.31%，同时土体的工程性质有更为明显的提升。气囊侧向压力引起的附加应力增量沿竖向分布均匀，同时每次加压引起的孔压和土压的增量随土体固结度的提高而降低。通过对地基变形场的分析得出，侧向压力使土体产生的侧向变形有限，地基变形仍以沉降为主，并且受装置变形和排水距离的影响，地基内部存在较大的不均匀性。模型试验的结果为该方法在实际工程中的方案设计提供依据。

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	李雪苑1
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	周航1
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	刘汉龙1
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	丁选明1
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关键词 ：土力学, 改性软土地基处理, 排水固结, 气囊增压, 室内模型试验

Abstract：The dredger fill consolidation under airbag pressurization combined with surcharge preloading (APCWSP) is studied by model test. The lateral pressure of airbag could increase the soil consolidation degree apparently. The consolidation degree is 82.75% and 75.31% for the APCWSP test and surcharge test，respectively，for the same consolidation time of 180 hours. And the engineering properties of soil in APCWSP test are accordingly better. The additional stress caused by pressurization is evenly distributed along the vertical direction. Also，the increment of the soil and pore water pressure decreases as the soil consolidation degree increases. According to soil displacement analysis，the displacement caused by lateral pressure is limited. Foundation deformation is still dominated by settlement. Moreover，the deformation is uneven because of the different drainage distance and device deformation. The result of the model test provides a basis for the application of APCWSP method in practice.

Key words： soil mechanics modified soft soil foundation treatment ；drainage consolidation airbag pressurize laboratory model experiments

引用本文:

李雪苑1，2，周航1，2，刘汉龙1，2，丁选明1，2. 气囊增压联合堆载加固冲填土地基模型试验研究[J]. 岩石力学与工程学报, 2020, 39(S1): 3085-3094.
LI Xueyuan1，2，ZHOU Hang1，2，LIU Hanlong1，2，DING Xuanming1，2. Model test study on dredger fill foundation treatment by airbag pressurization combined with surcharge preloading. , 2020, 39(S1): 3085-3094.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0878 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/3085

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