寒区公路涵洞加固填充材料试验研究

发布时间：2018-03-30 03:15

本文选题：涵洞加固　切入点：风积砂　出处：《长安大学》2014年硕士论文

【摘要】：多年冻土地区涵洞病害问题比较普遍，由于结构形式的不合理，或者基础埋深不足以及在冻胀融沉作用下均会导致涵洞的各种病害，，本文主要针对青海省境内G214公路盖板涵涵身的损坏情况，提出了无机结合料稳定风积砂换填台背及涵底垫层；采用自密实混凝土填充盖板涵与金属波纹管之间的狭小空间。分别对这两种加固方案所用的材料通过室内试验进行了一系列研究。首先，研究风积砂基本特性，通过重型击实试验研究了含水量和干密度的关系，从而确定最大含水量和最大干密度。其次，用水泥、石灰、石灰粉煤灰三种无机类材料加固风积砂，通过重型击实试验分别研究各类材料的掺量和不同含水量对密实度的影响及变化规律，通过承载比CBR试验分别研究各类材料掺量和不同含水量对CBR值的影响及变化规律。再次，对自密实混凝土进行配合比设计，通过掺入粉煤灰、矿渣微粉、橡胶粉等不同种类的掺合料，分析掺合料对拌合物的工作性能及抗压强度的影响。
[Abstract]:The problem of culvert diseases in permafrost regions is quite common. Due to the unreasonable structure form or the insufficient foundation depth and frost heaving and thawing subsidence, all kinds of culvert diseases will be caused.Aiming at the damage of cover culvert of G214 highway in Qinghai province, the paper puts forward the inorganic binder stabilized wind-sand replacement platform back and culvert bottom cushion, and uses self-compacting concrete to fill the narrow space between the cover slab culvert and metal bellows.A series of experiments were carried out on the materials used in these two reinforcement schemes.Firstly, the basic characteristics of aeolian sand are studied, and the relationship between water content and dry density is studied by heavy compaction test to determine the maximum moisture content and maximum dry density.Secondly, three kinds of inorganic materials, cement, lime, lime and fly ash, are used to reinforce the aeolian sand.The influence of different material content and different moisture content on CBR value and its variation law were studied by CBR test of loading ratio.Thirdly, the mix ratio of self-compacting concrete is designed, and the influence of the admixture on the working performance and compressive strength of the mixture is analyzed by adding different kinds of admixtures such as fly ash, slag powder, rubber powder and so on.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U449

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