Forensic Assessment on Ground Instability Using Electrical Resistivity Imaging (ERI)

2nd International Conference on Rheology and Modeling of Materials

Hazreek, Z.A.M.^1,2 ; Azhar, A.T.S.^1,2 ; Aziman, M.^1,2 ; Fauzan, S.M.S.A.^3 ; Ikhwan, J.M.^3 ; Aishah, M.A.N.^4

Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat Johor

86400, Malaysia^1

Research Center for Soft Soil, Universiti Tun Hussein Onn Malaysia, Batu Pahat Johor

86400, Malaysia^2

Geo-Structure Construction, MARA High Skills College, Batu Pahat, Johor

86400, Malaysia^3

Geotechnical and Geo-Environmental Engineering, Kumpulan IKRAM SDN Bhd, Kajang, Selangor

43000, Malaysia^4

关键词: Cohesive materials;    Differential stiffness;    Electrical resistivity anomalies;    Electrical resistivity imaging (ERI);    Ground improvement;    Ground instability;    Integrated analysis;    Sub-surface materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/790/1/012038/pdf
DOI  :  10.1088/1742-6596/790/1/012038

来源: IOP

【 摘 要 】

Electrical resistivity imaging (ERI) was used to evaluate the ground settlement in local scale at housing areas. ERI and Borehole results were used to interpret the condition of the problematic subsurface profile due to its differential stiffness. Electrical resistivity of the subsurface profile was measured using ABEM SAS4000 equipment set. ERI results using electrical resistivity anomaly on subsurface materials resistivity shows the subsurface profile exhibited low (1 - 100 m) and medium (> 100 m) value (ERV) representing weak to firm materials. The occurrences of soft to medium cohesive material (SPT N value = 2 - 7) and stiff cohesive material (SPT N ≥ 8) in local scale has created inconsistency of the ground stability condition. Moreover, it was found that a layer of organic decayed wood (ERV = 43 ∼ 29 m & SPT N = 15 ∼ 9) has been buried within the subsurface profile thus weaken the ground structure and finally promoting to the ground settlement. The heterogeneous of the subsurface material presented using integrated analysis of ERI and borehole data enabled ground settlement in this area to be evaluated. This is the major factor evaluating ground instability in the local scale. The result was applicable to assist in planning a strategy for sustainable ground improvement of local scale in fast, low cost, and large data coverage.