Numerical investigations on slope stability using an elasto-brittle model considering fissure water pressure
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ORIGINAL PAPER
Numerical investigations on slope stability using an elasto-brittle model considering fissure water pressure Yong Li 1 & Hao Zhou 1 & Weishen Zhu 1 & Shucai Li 1 & Jian Liu 2
Received: 22 December 2014 / Accepted: 21 May 2015 # Saudi Society for Geosciences 2015
Abstract The initiation, propagation, coalescence evolution behaviors of cracks in rock mass, and even fissure water pressure have significant impacts on the strength and stability of fractured rock mass in engineering projects. In this paper, we propose an elasto-brittle constitutive model considering fissure water pressure based on the computer code threedimensional fast Lagrangian analysis of continua (FLAC3D). This constitutive model is initially validated through a precracked rock-like-material specimen in the laboratory experiments and then proved to actually simulate the initiation, propagation, and coalescence characteristics of cracks considering fissure water pressure in brittle fractured rock mass. Afterwards, it is used to investigate the stability of the right bank slope in Dagangshan hydropower station which is located in Sichuan province, China. The whole stability of this rock slope during construction has been simulated using the above constitutive model. The development principles of cracks in a selected area and the displacement field of the slope under different fissure water pressures are obtained in the process of excavations. It is concluded that fissure water pressure has obvious and significant effect on the strength and stability of fractured rock mass.
* Yong Li [email protected] 1
Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong Province 250061, People’s Republic of China
2
School of Civil Engineering, Shandong University, Jinan, Shandong Province 250061, People’s Republic of China
Keywords Fractured rock mass . Slope stability . Elasto-brittle model . Fissure water pressure . Numerical simulation
Introduction With the implementation of BWest development^ strategy and the demand for west-east electricity transmission project in China, more and more hydroelectric power stations would be built in southwestern areas, and most of which would be located in high mountains and valleys. Consequently, the stability of high steep rock slopes would be one of crucial and challenging engineering problems. The construction process of rock slope projects would result in the disturbance of surface and inner rock mass. From a microscopic view, this disturbance would lead to the initiation, propagation, and even coalescence of cracks in the rock mass. Due to fissure water pressure, the stability of the rock slopes would be greatly degraded. Therefore, we could conclude that the factors influencing the safe and reliable performance of rock slopes include rock slope excavation induced by deep valleys and high dams, complex geological conditions, and unloading induced stress relief of the rock mass during the formation of valleys, and the complicated operation environment and loadin
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