Evaluation of rock slope stability for Yujian River dam site by kinematic and block theory analyses

Kulatilake, Pinnaduwa H.S.W.; Wang, Liangqing; Tang, Huiming; Liang, Yue

doi:10.1016/j.compgeo.2011.05.004

Cited by 69 publications

(28 citation statements)

References 20 publications

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“…Then this modeler was used in the stability analysis of an underground excavations and verified to have more significant advantages than the algorithm Menéndez-Díaz et al [21] proposed. Kulatilake et al [23] conducted kinematic and block theory analyses for rock slopes to evaluate the stability of slopes, and the numerical results showed that the maximum safe slope angles obtained from kinematic analysis are less than or equal to those obtained from block theory analysis, which verified that the results based on KBT were closer to reality. Fu and Ma [24] extended the KBT and proposed a force transfer algorithm to consider the force interactions of the adjacent batches of key blocks.…”

Section: Introductionmentioning

confidence: 57%

Jointed Surrounding Rock Mass Stability Analysis on an Underground Cavern in a Hydropower Station Based on the Extended Key Block Theory

Jia

Lian

et al. 2017

Energies

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Abstract:The jointed surrounding rock mass stability is of utmost importance to integral stability during the construction and long-term safety operation of the underground caverns in hydropower stations. The key blocks play a significant role in the integral stability of the jointed surrounding rock mass, therefore it is critical to determine the location, size, and failure mode of random key blocks. This paper proposes an improved method combining the traditional key block theory (KBT) and the force transfer algorithm to accurately calculate the safety factors of probabilistic key blocks in the surrounding rock mass. The force transfer algorithm can consider the interactions between the internal blocks. After the probabilistic characteristics of the joint fissures are obtained, the stereographic projection method is employed to determine the locations of dangerous joints. Then the vector analysis method is used to search the random blocks, determine the sliding directions of random blocks, and calculate the block sizes and safety factors near the free surface of the underground cavern, which can be used to comprehensively evaluate the surrounding rock mass stability. The above numerical results have provided powerful guidance for developing a reinforcement system for the surrounding rock mass.

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Section: Introductionmentioning

confidence: 57%

Jointed Surrounding Rock Mass Stability Analysis on an Underground Cavern in a Hydropower Station Based on the Extended Key Block Theory

Jia

Lian

et al. 2017

Energies

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“…As noted in previous investigations of unsaturated fluid flow in slope engineering [1,2,25], rainfall infiltration will increase the water pressure inside the rocks and fractures and weaken the rock strength parameters; the landslide often occurs in the rain season. And the analysis of the fractured rock slope has been employed to demonstrate the capacity and robustness of the proposed coupled model for describing the rainfall infiltrating process influencing the slope water pressure, displacement, and stress distribution.…”

Section: Analysis Of a Fractured Rock Slope Considering Rainfall Infimentioning

confidence: 99%

“…As mentioned in previous studies about water flow in the fractured rocks, natural fractures cannot completely close under high normal stress with enough mechanical aperture. Assuming 01 , 02 are the initial fractures aperture for each side of the fracture, 1 , 2 representing the fracture aperture after rock deformed are written by (25) considering fracture normal deformations 1 and 2 (open is positive) and shear deformations 1 and 2 computed by DDA. And then, the corresponding flow rate can be expressed by (26); thus the equivalent hydraulic aperture can be calculated by (27) to get new permeability tensor at any time…”

Section: Unsaturated Hydromechanical Coupling Model Of Fractured Rockmentioning

confidence: 99%

The Unsaturated Hydromechanical Coupling Model of Rock Slope Considering Rainfall Infiltration Using DDA

Liu

2017

Geofluids

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Water flow and hydromechanical coupling process in fractured rocks is more different from that in general porous media because of heterogeneous spatial fractures and possible fracture-dominated flow; a saturated-unsaturated hydromechanical coupling model using a discontinuous deformation analysis (DDA) similar to FEM and DEM was employed to analyze water movement in saturated-unsaturated deformed rocks, in which the Van-Genuchten model differently treated the rock and fractures permeable properties to describe the constitutive relationships. The calibrating results for the dam foundation indicated the validation and feasibility of the proposed model and are also in good agreement with the calculations based on DEM still demonstrating its superiority. And then, the rainfall infiltration in a reservoir rock slope was detailedly investigated to describe the water pressure on the fault surface and inside the rocks, displacement, and stress distribution under hydromechanical coupling conditions and uncoupling conditions. It was observed that greater rainfall intensity and longer rainfall time resulted in lower stability of the rock slope, and larger difference was very obvious between the hydromechanical coupling condition and uncoupling condition, demonstrating that rainfall intensity, rainfall time, and hydromechanical coupling effect had great influence on the saturatedunsaturated water flow behavior and mechanical response of the fractured rock slopes.

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“…Wedge sliding is probably the most common and general case dealt with in rock slope stability analyses (Hoek and Bray 1981;Ö cal and Ozgenoglu 1997;Chen 2004). Hence, the problem has been discussed extensively in the literature (e.g., Markland 1972;Hocking 1976;Goodman 1976;Lucas 1980;Hoek and Bray 1981;Kulatilake 1985;Kulatilake and Fuenkajorn 1987;Kulatilake 1988;Ö cal and Ozgenoglu 1997;Low 1997;Park and West 2001;Wang and Yin 2002;Chen 2004;Wang et al 2004;Jimenez-Rodriguez and Sitar 2007;Kulatilake et al 2011;Jiang et al 2013). Most of the above studies consider only wedge sliding along the line of intersection (LOI).…”

mentioning

confidence: 97%

“…Kinematic analysis is very useful in investigating possible modes of failure (MOF: plane sliding, wedge sliding, and toppling) of rock masses that contain discontinuities, and in determining the corresponding maximum safe slope angles (MSSA) (Um and Kulatilake 2001;Kulatilake et al 2011). The stereographic projection method provides a graphical solution to problems involving the relative orientations of lines and planes in space (Goodman 1989), and it made an important contribution to kinematic analysis in the era before personal computers were popular.…”

mentioning

confidence: 99%

Development of a probabilistic kinematic wedge sliding analysis procedure and application to a rock slope at a hydropower site in China

Zheng

Kulatilake

Deng

et al. 2015

Bull Eng Geol Environ

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In performing kinematic wedge stability analysis, in practice, it is usually assumed that the wedge is a ''Standard Wedge'' (the term is explained in the paper) sliding along the line of intersection of the two discontinuity planes. Intersection of two discontinuities with the lower and upper rock slope surfaces can result in forming Standard Wedges, Overlying Wedges and No Wedges. Vector procedures are developed in the paper to differentiate the aforementioned formation modes for the wedges. Vector procedures are then given to calculate the sliding modes, sliding directions, maximum safe slope angles and factor of safety for the Standard and Overlying wedges. Procedures are also given to incorporate the variability of discontinuity orientations and strength and to calculate the instability cumulative probabilities corresponding to different cut slope dip angles. All these procedures are incorporated in a computer code, named PKWSAC. The developed procedure and the computer program were then validated by applying them to three examples and comparing the results obtained through this procedure with the results obtained through Lucas' stereographic procedure [Lucas JM (1980) Int J Rock Mech Min Sci Geomech Abstr 17:57-61]. The validated procedure was then applied to a rock slope at a hydropower site in China to perform both deterministic and probabilistic kinematic wedge stability analyses. The paper also shows a comparison between the deterministic and probabilistic analyses results.

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Evaluation of rock slope stability for Yujian River dam site by kinematic and block theory analyses

Cited by 69 publications

References 20 publications

Jointed Surrounding Rock Mass Stability Analysis on an Underground Cavern in a Hydropower Station Based on the Extended Key Block Theory

Jointed Surrounding Rock Mass Stability Analysis on an Underground Cavern in a Hydropower Station Based on the Extended Key Block Theory

The Unsaturated Hydromechanical Coupling Model of Rock Slope Considering Rainfall Infiltration Using DDA

Development of a probabilistic kinematic wedge sliding analysis procedure and application to a rock slope at a hydropower site in China

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