Geotechnical forensic investigation of a slope failure on silty clay soil—A case study
Mohammad Abubakar NAVEED1, Zulfiqar ALI1,2(), Abdul QADIR1, Umar Naveed LATIF1, Saad HAMID1, Umar SARWAR1
1. Military College of Engineering, National University of Sciences and Technology, Risalpur 24080, Pakistan 2. School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaibe 5096, Australia
Qila Bala Hisar is one of the noteworthy places of Peshawar, Khyber Pakhtunkhwa. The fort was constructed on a filled ground during the 18th century and it was renovated several times by the occupants ever since. Recently, due to an earthquake of magnitude 7.3, the upper part of the south-western wall of the fort collapsed. The collapse of the wall was attributed to the failure of the retained slope. This research was undertaken to characterize the slope material, study causal factors of failure and evaluate remedial strategy. The investigation involved conventional field and laboratory testing and geophysical investigation using electrical resistivity technique to evaluate the nature of stratum. Also, X-ray Diffraction and Scanning Electron Microscopy was used to study the slope material at a molecular level to evaluate the existence of swelling potential. The analysis has shown that excessive seepage of water caused by the poor maintenance of runoff and sewage drains is the causal factor triggered by the seismic event. A remedial strategy involving soil nails, micro piles and improvement of the surface drainage is recommended.
. [J]. Frontiers of Structural and Civil Engineering, 2020, 14(2): 501-517.
Mohammad Abubakar NAVEED, Zulfiqar ALI, Abdul QADIR, Umar Naveed LATIF, Saad HAMID, Umar SARWAR. Geotechnical forensic investigation of a slope failure on silty clay soil—A case study. Front. Struct. Civ. Eng., 2020, 14(2): 501-517.
not to exceed 4% of initial volume all bleeding water shall be reabsorbed after 24 h
24 h volume change
within range of 0% to+ 5%
Tab.6
material
construction method
soil type
ultimate bond,strength qu (kPa)
fine-grained soils
rotary drilled
silty clay
35–50
driven casing
clayey silt
90–140
augured
loess
25–75
soft clay
20–30
stiff clay
40–60
stiff clayey silt
40–100
calcareous sandy clay
90–140
Tab.7
Fig.22
Fig.23
1
K Terzaghi. Stability of slopes of natural clay. In: Proceedings of the 1st International Conference on Soil Mechanics and Foundation Engineering. Cambridge, 1936, 1: 161–165
2
P Allasia, A Manconi, D Giordan, M Baldo, G. Lollino Advice: A new approach for near-real-time monitoring of surface displacements in landslide hazard scenarios. Sensors Switzerland, 2013, 13: 8285–8302
3
B Friedli, D Hauswirth, A M Puzrin. Lateral earth pressures in constrained landslides. Geotechnique, 2017, 67: 890–905
4
M. Mentzini Structural interventions on the Acropolis monuments. The Acropolis Restoration News, 2006, 6: 15–18
5
A Ruffell, J McKinley. Forensic Geoscience: Applications of geology, geomorphology and geophysics to criminal investigations. Earth-Science Reviews, 2005, 69(3–4): 235–247 https://doi.org/10.1016/j.earscirev.2004.08.002
6
S Ali, A Q Khan, U Z Shehryar, T Haider. Forensic geotechnical distress evaluation of damaged buildings in alluvial-loessic soils: A case history. In: International Conference on Case Histories in Geotechnical Engineering. Chicago: Missouri University of Science and Technology, 2013
7
K M Hamdia, M Silani, X Zhuang, P He, T Rabczuk. Stochastic analysis of the fracture toughness of polymeric nanoparticle composites using polynomial chaos expansions. International Journal of Fracture, 2017, 206(2): 215–227 https://doi.org/10.1007/s10704-017-0210-6
8
T Rabczuk, T Belytschko. A three-dimensional large deformation meshfree method for arbitrary evolving cracks. Computer Methods in Applied Mechanics and Engineering, 2007, 196(29–30): 2777–2799 https://doi.org/10.1016/j.cma.2006.06.020
9
H Renb, X Zhuanga, T Rabczukd. Dual-horizon peri dynamics: A stable solution to varying horizons. Computer Methods in Applied Mechanics and Engineering, 2017, 318: 762–782
10
P Raileanu, N Boti, A Stanciu. Geology, Geotechnics and Foundations. Lasi: Technical University of Lasi, 1986
11
G W Clough, T D O’Rourke. Construction induced movements of in-situ walls. In: Proceedings, ASCE Conference on Performance of Earth Retaining Structures, Geotechnical Special Publication No. 25. New York: ASCE, 1990, 439–470
12
J L Briaud. Introduction to Geotechnical Engineering. New Jersey: John Wiley & Sons, Inc., 2013, 649–697
13
ASTM Standard D1586/D1586M. Standard Test Method for Standard Penetration Test (SPT) and Split-Barrel Sampling of Soils. Annual Book of ASTM Standards. West Conshohocken, PA: American Society for testing and Materials, 2004
14
ASC Geosciences, Inc. Report of Geotechnical Field Exploration, Data Evaluation, and Engineering Consultation Services. Report No. 06L1507. Lakeland, Florida, 2007
15
N J Delatte, K L Rens. Forensics and case studies in civil engineering education: State of the art. Journal of Performance of Constructed Facilities, 2002, 16(3): 98–109 https://doi.org/10.1061/(ASCE)0887-3828(2002)16:3(98)
16
ASTM Standard D 4318-93. Liquid Limit, Plastic Limit, and Plasticity Index of Soils. Annual Book of ASTM Standards. West Conshohocken, PA: American Society for testing and Materials, 2004
K Terzaghi, R B Peck. Soil Mechanics in Engineering Practice. 1st ed. New York: John Wiley & Sons, 1948, 566
19
R B Peck, W E Hanson, T Thornburn. Foundation Engineering. New York: John Wiley & Sons, 1953, 410
20
A W Skempton. The Colloidal Activity of Clays. In: Proceedings of the 3rd International Conference on Soil Mechanics and Foundation Engineering, 1953, (1): 57–61
21
S Zhou, X Zhuang, T Rabczuk. A phase-field modeling approach of fracture propagation in poroelastic media. Engineering Geology, 2018, 240: 189–203 https://doi.org/10.1016/j.enggeo.2018.04.008
22
T Rabczuk, T Belytschko. Cracking particles: A simplified meshfree method for arbitrary evolving cracks. International Journal for Numerical Methods in Engineering, 2004, 61(13): 2316–2343 https://doi.org/10.1002/nme.1151
23
T Rabczuk, G Zi, S Bordas, H Nguyen-Xuan. A simple and robust three-dimensional cracking-particle method without enrichment. Computer Methods in Applied Mechanics and Engineering, 2010, 199(37–40): 2437–2455 https://doi.org/10.1016/j.cma.2010.03.031
24
S Zhou, X Zhuang, H Zhu, T Rabczuk. Phase field modelling of crack propagation, branching and coalescence in rocks. Theoretical and Applied Fracture Mechanics, 2018, 96: 174–192 https://doi.org/10.1016/j.tafmec.2018.04.011
25
F E Schlosser. Recommendations CLOUTERRE 1991—Soil Nailing Recommendations 1991. Washington, D.C.: U.S. Federal Highway Administration, 1993
26
FHWA. Geotechnical Circular No. 7. Soil Nail Walls. Publication FHWA-IF-03-017. Washington, D.C.: U.S. Department of Transportation, Federal Highway Administration, 2003
27
I Juran, V Elias. Ground Anchors and Soil Nails in Retaining Structures. Foundation Engineering Handbook. Boston, MA: Springer, 1991