New Approaches in Civil Engineering

New Approaches in Civil Engineering

Modeling Cementation of Coarse-Grained Alluvial Soils Using Chamber Apparatus and Pressuremeter Test

Document Type : Original Article

Authors
1 Assistant Professor, Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
2 Associate Professor, Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
3 Master's degree student, Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
Abstract
The Coarse-grained alluvium is most common in urban areas, which is due to the sedimentation process in these areas. A metropolis like Tehran also has this alluvium in subsurface layers in most of its areas. Various projects are implemented in this metropolis every year below the ground surface. Therefore, the behavior of this type of material is very important and is of much higher importance in projects such as protecting excavation walls and tunneling. This article attempts to model the effect of cementation on the behavior of coarse-grained alluvium in Tehran based on the results of in-situ and laboratory tests. For this purpose, a laboratory chamber device has been built to perform pressuremeter tests in a laboratory environment. Pressuremeter tests have been used because most of the parameters affecting the behavior of coarse-grained alluvium are directly and indirectly accessible from the results of this test. The Sadr-Niyaish Tunnel Project in Tehran has been used to perform pressuremeter tower tests. By comparing the adhesion coefficient values obtained from in situ and laboratory Pressuremeter tests, it is observed that the lack of cementation effect in the reconstructed soils has caused a decrease in the adhesion coefficient values. This decrease has been up to 50% of the in-situ values at some depths.
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