چكيده به لاتين
It is known that regarding triaxial tests in MSW, as strain increases, material strength increases and keeps increasing without reaching to a peak. In undrained tests, this behavior is accompanied by pore pressure build-up which may increase to confining stress level or in some cases such as over-consolidated MSW samples even more. Concept of the said issue is that the actual confining stress applied to the sample becomes neutralized which in a way is the same concept of liquefaction in soil mechanics.
Accordingly, only one candidate remains to sustain the strength of the samples which is Cohesion. On the other hand, the results of previous researches show that MSW has a frictional behavior and its strength increases as the confining stress increases. Therefore, strength and stability of samples in high axial strain levels cannot be due to cohesion.
By scrutinizing the results of existing researches such as Carvalho (1999) and Nascimento (2007), it’s comprehensible that the total stress results of CD triaxial tests and CU triaxial tests on samples with same initial conditions are not compatible with each other.
Although the effect of both non-homogeneous nature of solid waste and anisotropy as a result of various fiber directions Zekkos (2005) can be a possible candidate for this incompatibility, the main reason must be something else.
The main purpose of this research is to evaluate the effect of solid waste particles’ compressibility in inter-particle effective stress surface, as an explanation for mentioned incompatibility.
