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以灰砂比0.03、0.05和0.08,粉砂比0、0.05、0.1、0.15和0.2为设计参数,对建筑垃圾回填材料进行设计。通过试验对回填材料的流动性(流动度、泌水率)、无侧限抗压强度以及应力应变曲线、本构关系模型和弹性模量等进行研究。研究结果表明:回填材料的流动度受水固比影响较大,两者接近线性关系;流动度在200~250mm范围,泌水率在4%~8%之间;回填材料抗压强度与灰砂比和水固比之间存在很好的幂指数关系;回填材料应力应变曲线形状与普通混凝土的相似,在此基础上提出回填材料的本构关系模型;回填材料无侧限抗压强度与弹性模量之间存在很好的指数关系。
The design parameters of construction waste backfill materials are designed with the ratio of sand to sand 0.03, 0.05 and 0.08, and the ratio of silt to sand 0, 0.05, 0.1, 0.15 and 0.2. The fluidity (fluidity, bleeding rate), unconfined compressive strength, stress-strain curve, constitutive model and elastic modulus of backfill materials were studied through experiments. The results show that the fluidity of the backfill material is greatly affected by the water-solid ratio, and the two are close to a linear relationship; the fluidity is in the range of 200-250mm and the bleeding rate is between 4% and 8%; the compressive strength of the backfill material and the ash Sand ratio and water-solid ratio have a good power index relationship; backfill material stress and strain curve shape is similar to ordinary concrete, and then put forward the constitutive model of backfill material; backfill unconfined compressive strength and There is a good exponential relationship between the elastic moduli.