The Effect of Suffusion Phenomenon in the Increasing of Land Subsidence Rate
Abstract: Land subsidence is
defined as gradually ground surface settlement in an aquifer due to the
compaction of unconsolidated sedimentary deposits. Since in an aquifer, deposits
consist of cohesive or non-cohesive alluvial soil layers. The consolidation
theory cannot be explained as the only reason for land subsidence. According to
the susceptibility of alluvial soils to suffusion, internal erosion is also
considerable to enhance the rate of the local settlement. Suffusion is
explained as a process of soil particle movement in the soil body due to the
effect of seepage flow on it. The subsidence rate in southwest and south of
Tehran in Iran is very considerable whereby some structures have suffered
significant damages due to this phenomenon. In this research, the contribution
of suffusion and land subsidence was investigated in damaged building located
at Ghale Morghi Street in southwest of Tehran, as a case history. Because of the
incapability of available methods, in this article, a probability pattern is
also proposed using statistical analysis for determination the likelihood of
internal instability in alluvial soils in regard to soil cohesiveness.
Keywords: Suffusion; Alluvial
Soil; Land Subsidence; Statistical Analysis; Logistic Regression; Cohesiveness
Author: Elmira Khaksar Najafi,
Hadi Faghihmaleki
Journal Code: jptsipilgg160026
