Effect of disturbed zone thickness on rock slope stability

Cut slope surfaces are affected by excavation activities and weathering agents. Disturbances on the surface can penetrate down to a certain depth. Slope stability analyses made on the cut slopes can reveal unsatisfactory results unless the disturbance depth is determined. Moreover, false designs ignoring the shear strength parameter differences of inner and surface sections of the slopes can affect the safety of the highways. Disturbance thickness due to blasting effect is already presented in the literature; however, the mechanical excavation is still unknown. In this study the effect of mechanical excavation on disturbance thickness is investigated by using 54 cut slopes selected from Western Black Sea Region of Turkey. According to UCS results, the strength values of the undisturbed zones are found to be two times higher than the disturbed zones. The disturbance depths formed by excavation and weathering are found to be changing between 0.05 and 0.50 m on the cut slopes. Regarding the height (H) of the slopes, disturbance thickness is found to be affecting the slope up to 0.06 H which is lower than the blasting effect. It is recommended that this thickness should be taken into consideration when assigning the disturbance factor (D) and used to prevent stability problems of the cut slopes.


Effect of disturbed zone depth on slope stability analysis: a case study from Western Black Sea Region (Turkey)
Ersöz, Timur; Topal, Tamer (2019-10-07)
Rocks in road cuts are affected by weathering, excavation and tectonic activities. The weak rocks especially disturbed by tectonic activities lose their strength over the years due to excavation and weathering. One of the most important parts to consider here is the damage caused by the type of excavation to the rock mass. In addition, weathering reduces the rock strength towards inside of the slope through discontinuities. In this study, the effects of weathering and excavation on rock strength parameters ...
Assessment of cut slope stability in western Black Sea Region (Turkey)
Özköse, Merve; Topal, Tamer; Department of Geological Engineering (2019)
Cut slopes are intensely prone to weathering in the cause of excavation effects. Weathering effects can reduce strength of rocks and results in instabilities in the long run. By the reasons of rocks containing joints, fractures, faults, bedding planes and pore spaces, they are likely to be weathered because of wetting-drying cycles, climate changes, and chemical action of solutions absorbed. This study is mainly concerned with the slope stability analysis for sixteen permanent cut slopes that are composed o...
Effect of geosynthetic reinforcement on the bearing capacity of strip footing on sandy soil
Al-Subari, L.; Hanafi, M.; Ekinci, A. (2020-08-01)
Due to the increasing presence of problematic soils, expansive clays and highly compressive sand engineers are using a verity of soil improvement techniques to treat such soils. While geosynthetics are extensively used for improving soil characteristics in roads, pavements and embankments, it can also be used to increase the lack of bearing capacity of residential housing or lightweight structures constructed on sandy soils. In order to simulate site conditions in the laboratory environment, a laboratory-sc...
Effects of fly ash and desulphogypsum on the geotechnical properties of çayırhan soil
Baytar, Ali Özgür; Çokça, Erdal; Department of Civil Engineering (2005)
Collapse in soils occur when a partially unstable, partially saturated open fabric under high enough stress causing a metastable structure with large soil suction, or in the presence of a bonding or cementing agent, is allowed to free access to additional water. Such excess water reduces soil suction and weakens or destroys the bonding, this causing shear failure at the interaggregate or intergranular contacts, consequently, the soil collapses. In this study, the collapsible soils found in the Çayirhan Ther...
Effect of Foundation Soil Stiffness on the Seismic Performance of Integral Bridges
Dicleli, Murat (Informa UK Limited, 2011-05-01)
In this study, the effect of foundation soil stiffness on the seismic performance of integral bridges (IBs) is investigated. For this purpose, nonlinear structural models of a two-span TB with four different foundation soil stiffness types (loose, medium, medium-dense and dense sands) are built. In the nonlinear structural models, nonlinear soil structure interaction including free-field effects is considered. Then, the nonlinear time history analyses of the TB models are conducted using a set of ground mot...
Citation Formats
T. Ersöz and T. Topal, “Effect of disturbed zone thickness on rock slope stability,” NATURAL HAZARDS, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/90713.