含建渣回填土渗透性能的现场注水试验研究

摘要

确定回填土的渗透性能对建筑物的抗浮设计极为重要.建渣成分复杂、极不均匀,回填土中混入建渣会改变其水力特性,渗透系数难以确定.在含建渣的回填土(黏土、砂卵石土)中根据其不同的建渣含量分别布置8个试验点位,利用改进的双环注水设备对含建渣回填土的渗透特性进行现场双环注水试验研究.测定了不同建渣含量时回填土的渗透系数,并分析回填土中混入建渣对其渗透性的影响.试验结果表明,建渣混合回填会显著增加回填土渗透性,且砂卵石土渗透系数受混入建渣的影响要大于黏土;回填土渗透系数与建渣含量之间存在正指数关系,并提出了一个简明的含建渣回填土渗透系数计算公式,为回填施工提供参考依据.%It is very important to determine the backfill soil permeability for the anti-floating design of structure. When the architecture sediments are used as backfill material,due to the complexity of its hydraulic characteristics, the original permeability performance of backfill materials will be changed.In the clay backfill and sandy pebble soil backfill construction site layout 8 test points.In order to study the backfill containing architecture sediments in-filtration characteristics,in-situ experiment was carried out by using the improved double-ring infiltrometer.Experi-ment measured the backfill permeability coefficient of different architecture sediments content, and analyze the backfill permeability affected by architecture sediments mixture.The test results show that the architecture sedi-ments mixed backfill will increase the backfill permeability significantly,and sandy pebble soil permeability coeffi-cient is affected by architecture sediments more than clay,clay is more suitable than sandy pebble soil as backfill material.Backfill permeability coefficient and slag content has an exponential relationship.Proposed a simple for-mula for calculating the coefficient of permeability of backfill containing architecture sediments,which can provide reference for backfill construction.