Stability analysis of three-dimensional slopes under water drawdown conditions

GaoYufeng,; ZhuDesheng,; ZhangFei,; Qin, Hongyu

doi:10.1139/cgj-2013-0448

Cited by 77 publications

(26 citation statements)

References 20 publications

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“…Sandstone w s = 0.4034n − 0.0012 R 2 = 0.99 (5) Mudstone w m = 0.6052n − 2.0041 R 2 = 0.93 (6) where w is the water adsorption of the rock specimen, %; n is the porosity of the rock specimen. good linear relationship (Equations (5) and (6)) in both sandstone and mudstone specimens.…”

Section: Effects Of Cyclic Wetting-drying On Water Adsorptionmentioning

confidence: 99%

“…Sandstone ws = 0.4034n -0.0012 R 2 = 0.99 (5) Mudstone wm = 0.6052n -2.0041 R 2 = 0.93 (6) where w is the water adsorption of the rock specimen, %; n is the porosity of the rock specimen. As is known, the water storage capacity depends on the porosity of the rock specimens, and water absorption is the external manifestation of the size and distribution of cracks in the rock.…”

Section: Effects Of Cyclic Wetting-drying On Water Adsorptionmentioning

confidence: 99%

“…Because they are difficult to divide [2], the mixture of sandstone and mudstone particles is often used as a main fill material in many hydraulic and civil engineering works in Chongqing city [3]. While this material is filled in or along a large reservoir bank, it could be subjected to cyclic wetting and drying caused by cyclic lowering and rising of water level, which may affect the mechanical behavior of the mixture, and then reduces stability of filled structures [4][5][6]. The mechanical properties of the sandstone and mudstone particles mixture mainly depend on its parent rocks (sandstone and mudstone).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Cyclic Wetting-Drying Conditions on Elastic Modulus and Compressive Strength of Sandstone and Mudstone

et al. 2018

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The influence of water on the mechanical properties of rock is vital for determining the rock stability when subjected to changes of water conditions. In this paper, a series of uniaxial compression tests were conducted to investigate effects of cyclic wetting and drying on the mechanical properties of sandstone and mudstone collected from Chongqing city, China. The results showed that both elastic modulus and uniaxial compressive strength of sandstone and mudstone were reduced by wetting and drying cycles, and that the degradation rate of the two mechanic parameters of mudstone was always larger than sandstone. The parameters, including water adsorption, degradation degree of elastic modulus, degradation degree of uniaxial compressive strength, increase with the increase of the wetting-drying cycles (N). The relationship between these three parameters and the value of N + 1 could be well fitted by logarithmic curves. The average degradation degree was also used to describe the degradation of per time wetting-drying cycles. It is found that the average degradation degree of elastic modulus and uniaxial compressive strength decrease with the increase of wetting-drying cycles. Moreover, the relationships between the mechanical properties and the porosity are presented, which can be fitted by linear curves. In the cyclic wetting-drying process, the elastic modulus and the uniaxial compressive strength decreased with the porosity increasing, and the degradation rates of sandstone mechanic parameters were higher than those of mudstone.

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Section: Effects Of Cyclic Wetting-drying On Water Adsorptionmentioning

confidence: 99%

Section: Effects Of Cyclic Wetting-drying On Water Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Cyclic Wetting-Drying Conditions on Elastic Modulus and Compressive Strength of Sandstone and Mudstone

et al. 2018

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“…Studies have mostly focused on the rapid drawdown corresponding to embankment dams and slopes rather than the occurrence of this phenomenon in tunneling projects. Researches regarding the effects of water drawdown on the stability of slopes and dams have been done by Viratjandr and Michalowski [4], Yan et al [5], Wang et al [6], Gao et al [7], Song et al [8] Brinkgreve et al [9] and Zieba et al [10]. The limited number of studies on this subject include Atkinson and Mair [11], Bowers et al [12], Addenbrooke [13], Shin et al [2], Anagnostou [14,1], Yoo et al [15], Moon and Fernandez [16], Wanga and Wang [17], Yoo et al [18], Shen et al [19] Xu et al [20], Alonso and Pinyol [21] and Yoo [3,22].…”

Section: Figure 1 Ground Settlement Affected By Rapid Drawdown Durinmentioning

confidence: 99%

Study on the Rapid Drawdown and Its Effect on Portal Subsidence of Heybat Sultan Twin Tunnels in Kurdistan-Iraq

2017

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The excavation of tunnels below the water table causes variations in the hydraulic level, pore pressure and effective stresses. In this regard, rapid drawdown is considered as a destructive phenomenon as to the change in the flow regime which has mostly been studied for the reservoirs of embankment dams. The rapid drawdown occurred at the upstream shell of the dam gives rise to increase in the pore pressure at the upstream shell. This is as a result of the incompliance between the water loss inside the shell and the reservoir water level. Hence, it would be more likely to have instability and sliding at the upstream slope on account of decrease in the effective stress. Lack of sufficient studies performed on this matter in tunnelling projects on the one hand and the knowledge on the most important parameter for decreasing the destructive effects of this phenomenon on the other hand necessitates performing further studies on this matter. To this end, the reasons for the occurrence as well as the affecting parameters were studied by modelling the large subsidence of the inlet portal of Heybat Sultan twin tunnels located in Kurdistan-Iraq making use of the variations of the groundwater boundary conditions under Phase2 code. The modelling results depict the importance of the drawdown rate and the permeability coefficient of the surrounding rock mass. In the interim, the rapid loss in the hydraulic gradient caused by the drainage of a considerable volume of precipitations into the tunnels led to the rapid decrease in the pore pressure and increase in the effective stresses up to total stress. This has resulted in the consolidation settlement in the tunnel portal.

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“…Viratjandr [6] used the kinematic limit analysis approach to examine the stability of slope subjected to a rapid or slow drawdown. Based on the theory of limit analysis, Gao [7] discussed the three-dimensional effect of slope under the condition of water level plummeting and found that the plane strain analysis was suitable to evaluate the stability of the waterfacing slope when the aspect ratio was greater than 10. Meanwhile, some researchers studied the failure mechanism, the failure mode, and the deformation mechanism of waterfacing slope by large-scale model tests and centrifuge tests [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

SPH Simulation on the Coupled Failure of Slope‐Building Adjacent to Water Triggered by the Rapid Drawdown of Water Level

Zhou

Zhang

et al. 2019

Mathematical Problems in Engineering

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With the development of economy, more and more buildings are constructed on both sides of rivers. The rapid drawdown of water level may induce the change of groundwater seepage in the river bank, thus affecting the stability of buildings on the bank. In this study, the right bank of Qinhuai river with its ancillary building from the Dinghuai Gate to the Qingliang Gate in Nanjing City is analyzed to reveal the failure mechanism and coupled failure mode of slope and building adjacent to water. The soil-water coupled SPH program considering the interaction between soil and structure has been proposed. Then this model is used to study the evolutionary deformation mechanism of slope and building under the rapid drawdown of water level. The results indicate that the potential slip surface of slope and the asymmetrical distribution of plastic zone in the foundation of building become more obvious under the rapid drawdown of water level. Besides, the differential settlement of building induced by the rapid drawdown causes the building tilt. When the sliding surface of the slope passes the building, the differential settlement will become larger. This study is conducive to reveal the coupled failure mechanism of slope and building and also to provide scientific basis for the prevention of such disasters.

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Stability analysis of three-dimensional slopes under water drawdown conditions

Cited by 77 publications

References 20 publications

Effects of Cyclic Wetting-Drying Conditions on Elastic Modulus and Compressive Strength of Sandstone and Mudstone

Effects of Cyclic Wetting-Drying Conditions on Elastic Modulus and Compressive Strength of Sandstone and Mudstone

Study on the Rapid Drawdown and Its Effect on Portal Subsidence of Heybat Sultan Twin Tunnels in Kurdistan-Iraq

SPH Simulation on the Coupled Failure of Slope‐Building Adjacent to Water Triggered by the Rapid Drawdown of Water Level

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