Seite - 1420 - in Book of Full Papers - Symposium Hydro Engineering

To put it short, the analyses for the slope stability of trench excavation can be provided as per table 2, appropriate with the carried out analyses. Along with the provided allowable values, they can be compared to ensure acceptability of the excavation slope. 12. CONCLUSION With regards to pressure meter and other in-situ and laboratory test results in addition to the numerical analysis following design for stable slope was proposed: excavation with 1H: 1.5V slope in the first 15 m height with a 4m berm, at El. 738 m.a.s.l. following by a 8m berm at El. 745 m.a.s.l. and then excavation with a slope of 2H : 1V. For the surface soil, instead of initial design (using geogrid to support top soil) in order to prevent erosion using biological methods such as plantation is recommended. Indeed, the biological methods suggeted as the properties of the surface humos soil are instable and can flow down due to rainfall and this support is necessary to prevent erosion and flow of the mud. To support the toe of initial berm gabion is recommended as a facing. REFERENCES [1] Wang, L., Xie, M., Xu, B., & Esaki, T. (2015). A study on locating critical slip surface of slopes. International Journal of Geotechnical Engineering, 9(3), 265-278. [2] Huang, M., Fan, X., & Wang, H. (2017). Three-dimensional upper bound stability analysis of slopes with weak interlayer based on rotational- translational mechanisms. Engineering Geology, 223, 82-91. [3] Aas, G., Lacasse, S., Lunne, T., and Hoeg, K. (1986). Use of in situ tests for foundation design on clay, in Use of In Situ Tests in Geotechnical Engineering, S. P. Clemence, Ed., GSP 6, American Society of Civil Engineers, New York, pp. 1–30. [4] ASTM Standard D2850-07 (2007). Standard Test Method for Unconsolidated-Undrained Triaxial Compression Test on Cohesive Soils, ASTM International, West Conshohocken, PA. [5] ASTM Standard D4767-11 (2011). Standard Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soils, ASTM International, West Conshohocken, PA. [6] Ayres, D. J. (1985). Stabilization of slips in cohesive soils by grouting, Failures in Earthworks, Thomas, Telford, London. [7] Bishop, A. W., Alpan, I., Blight, G. E., and Donald, I. B. (1960). Factors controlling the shear strength of partly saturated cohesive soils, Proceedings 1420