局部静荷载作用下加筋对土拱效应的影响

Effects of Reinforcement on Soil Arching Development Under Localized Static Loading

摘要:

为探究局部静荷载作用下加筋对土拱效应的影响，利用铝棒相似土作为填料，设置4种不同的筋材布置方式，开展了平面应变活动门试验。试验结果表明，在自重和局部静荷载作用下，筋材的使用明显地减少了土拱的退化。与无筋情况不同，筋材的存在使得土拱在卸载阶段仍继续退化。当筋材总刚度基本相同时，垫层上、下方铺设两层筋材的方式有利于土拱的发展。另外，提出了预测不加筋活动门上方或筋材挠曲段上方由于局部静荷载引起的竖向附加应力的理论计算方法。

Abstract:

In this paper， plane-strain trapdoor tests were conducted to investigate the effects of reinforcement on the soil arching development under localized static loading， by using analogical soil made of aluminum rods as the backfill and by using four different reinforcement arrangements. Test results show that the use of reinforcement significantly minimizes soil arching under self-weight and localized static loading. Soil arching with reinforcement degrades greatly in unloading stages due to the existence of reinforcement， which was different from that without reinforcement. When the total reinforcement stiffness is the same， two low stiffness reinforcement layers with a backfill layer of certain thickness in between promotes soil arching. A soil arching analytical solution was proposed to predict the additional vertical stresses induced by localized static loading.