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提出采用高强土工格栅和土工格室对天然砂石与建筑固体废弃物再生混凝土骨料的混合料进行加筋,通过添加适量水泥、石灰或粉煤灰等黏结材料,构造变刚度加筋垫层,替代桩筏复合地基中的混凝土板,形成采用柔性筏板的桩筏复合地基。通过建立有限元数值模型进行了对比分析,研究结果表明:土工格室加筋垫层可以通过提兜效应和柔性筏板效应,充分调动桩墙的承载能力,有效减小桩间土荷载,提高桩土应力比;增大垫层弹性模量对土工格室加筋垫层工况工作性状的改善更为显著;实际工程中加筋垫层厚度不宜过大。
It is proposed that the mixture of natural aggregate and recycled solid aggregate of building solid waste is reinforced by using high-strength geogrid and geocell. By adding appropriate amount of cement, lime or fly ash and other bonding materials, the variable rigidity reinforced mat Layer, replacing the concrete slab in the piled raft composite foundation to form a piled raft composite foundation with a flexible raft. Through the establishment of the finite element numerical model, the comparative analysis is carried out. The results show that the geocell reinforced cushion can fully mobilize the bearing capacity of the pile wall and reduce the soil load between the piles by raising the pocket effect and the flexible raft effect Pile-soil stress ratio. Increasing cushion elastic modulus is more significant to the improvement of working properties of geocell reinforced cushion. The thickness of reinforced cushion in practical engineering should not be too large.