锚固加强植被系统约束膨胀土变形模型试验研究

发布时间：2019-06-20 10:29

【摘要】：利用锚固加强植被系统(ARVS)约束膨胀土变形是一种新的尝试。为研究ARVS系统对膨胀土变形的约束效果,采用ARVS系统的室内简化装置,对南宁中等膨胀土进行有、无防护措施的浸水模型对比试验,对不同约束情况下膨胀土的变形进行对比分析,并根据模型受力情况采用有限元方法验证膨胀力的传递规律。结果表明,采用ARVS约束后膨胀土的吸湿变形过程仍然为3个阶段;ARVS系统能使膨胀土的膨胀量大幅降低,但ARVS系统在植草前后对膨胀土膨胀变形的约束效果差别不是很大,植草后膨胀土的变形能够较快到达稳定阶段;作用在高性能植被保护垫(HPTRM)上的膨胀力先通过锚头板传递至地锚,地锚再将膨胀力传递到土层中。锚固加强植被系统(ARVS)为膨胀土边坡的防护和治理提供了新的方法。
[Abstract]:It is a new attempt to use anchoring to strengthen vegetation system (ARVS) to restrain expansive soil deformation. In order to study the restraint effect of ARVS system on expansive soil deformation, the comparative test of water immersion model with and without protective measures was carried out on medium expansive soil in Nanning by using the indoor simplification device of ARVS system. The deformation of expansive soil under different constraints was compared and analyzed, and the finite element method was used to verify the transfer law of expansive force according to the stress of the model. The results show that the moisture absorption and deformation process of expansive soil is still three stages after ARVS constraint, and the expansion of expansive soil can be greatly reduced by ARVS system, but the restraint effect of ARVS system on expansive soil expansion deformation before and after planting grass is not very different, and the deformation of expansive soil after planting grass can reach the stable stage quickly. The expansion force acting on the high performance vegetation protection pad (HPTRM) is first transferred to the ground anchor through the anchor plate, and then the expansion force is transferred to the soil layer. Anchoring and strengthening vegetation system (ARVS) provides a new method for the protection and treatment of expansive soil slope.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国科学院大学;广西大学土木建筑工程学院;湖南省交通科学研究院;
【基金】：国家自然科学基金项目(No.41472286,No.41672312,No.41472290,No.41402276,No.51369006) 中国科学院青年创新促进会资助(2015年)~~
【分类号】：TU443

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