垃圾土地基灌浆处理试验

通过现场灌浆试验,钻取灌浆处理后的水泥垃圾土样进行水泥质量分数的分析试验,得到一次灌浆能使水泥浆在垃圾土地基中较均匀分布,水泥质量分数达到约10%,二次灌浆能增加水泥质量分数约25%的结果。经过室内水泥垃圾土样28 d养护强度试验,发现即使水泥掺入量达到25%、养护60 d,得到的应力应变曲线仍呈硬化型,水泥垃圾土仍是松散体,没有形成固结体。灌浆前后垃圾土地基的静载荷试验表明,灌浆能明显改善垃圾土地基的承载特性,提高地基的承载力,但由于垃圾填埋场现场养护条件限制,二次灌浆后垃圾土地基的破坏表现为脆性特征。

Grouting improvement of foundation of municipal solid waste

Based on the in-situ grouting tests,the mass fraction of cement was analyzed by boring samples of municipal solid waste after cement grouting.The cement was uniformly distributed over the foundation of municipal solid waste,and the mass fraction of cement reached 10% after the first grouting and increased to 25% after the second grouting.Through the strength tests on laboratory cement-waste samples after curing of 28 days,the stress-strain relation of the cement-waste samples exhibited hardening characteristics even when the dosage of cement reached 25% and the curing age was 60 days,and the cement-waste samples were loose and not consolidated.The static load tests on the foundation of municipal solid waste before and after grouting indicated that the bearing properties of the foundation of municipal solid waste could be improved by grouting,and the bearing capacity was obviously raised.However,the failure mode of the foundation of municipal solid waste after the second grouting was brittle because of the restricted in-situ curing conditions.