城市固体废弃物中孔隙水压力的试验研究

通过对室内配制的4组不同配比的城市固体废弃物(MSW)进行的三轴固结排水试验,得出孔隙水压力与时间、轴向应变的关系曲线。试验结果表明:城市固体废弃物中也存在孔隙水,但与土中的孔隙水有很大的不同。城市固体废弃物中的孔隙水压力分布很复杂,存在于孔隙中、不透水材料之上、有机质中,且沿深度方向并不呈线性分布,也不是连续的。因此土力学中的有效应力原理不适用于城市固体废弃物。建议不考虑城市固体废弃物中的固结,而将沉降分为压缩和生化降解两部分。

EXPERIMENTAL STUDIES ON THE PORE WATER PRESSURE OF MUNICIPAL SOLID WASTE

The results from the consolidated drained triaxial compression tests on the municipal solid waste (MSW) with four kinds of compositions,have shown the relation curves of pore water pressures and times and axial strains. The pore water pressures that exist in MSW and soil are different. The distributing of pore water pressure of MSW is very complex. The pore water pressure exist in pore,on impervious materials and in organic matter. It is nonlinear distributing and discontinuous along the depth. So,the application of principle of effective stress of soil mechanic is unsuitable here. It is suggested that the consolidation of MSW should not be considered and the settlement of MSW should be divided into compression and biological decomposition.