生活垃圾腐殖土的固结特性试验

Test on Consolidation Characteristics of Humus Soil for Municipal Solid Waste

垃圾腐殖土回填可行性对于垃圾填埋场矿化后的资源化具有重要意义。以典型垃圾腐殖土为试验材料,开展了不同压实度下腐殖土的固结特性以及回弹特性试验。试验结果表明:腐殖土压缩系数在0.07~1.45 MPa^(-1),压缩模量在1.85~32.32 MPa,压缩指数在0.39~0.50,当腐殖土的压实度达到90%以上时,属于中高压缩性土;回弹模量在50~60 MPa,回弹指数在0.021~0.027,卸载-再加载应力变化过程对腐殖土的压缩性影响较小,并且回弹后的固结过程和固结规律基本不变;腐殖土的固结速率与常规土体的固结速率具有相似性。以上研究结果对腐殖土原位回填提供了关键理论和数据支撑。

The feasibility of municipal solid waste humus soil backfilling is great significance for the resource utilization of landfill after mineralization.In this paper,the typical garbage humus soil was used as the test material to carry out the consolidation characteristics and resilience characteristics tests of humus soil under different compactness.The test results show that the compression coefficient of humus soil is between 0.07~1.45 MPa^(-1),the compression modulus is between 1.85~32.32 MPa,the compression index is between 0.39~0.50,when compactness of humus soil reaches more than 90%,it belongs to medium and high compressibility soil.The resilience modulus is between 50~60 MPa,the resilience index is between 0.021~0.027,the change process of unloading reloading stress has little effect on the compressibility of humus soil,and the consolidation process and consolidation law after resilience are basically unchanged.The consolidation rate of humus soil is similar to that of 0x0E䥺Symbol`@@0x0Fconventional soil.The above research results provide key theoretical and data support for humus soil in-situ backfilling.