The Large-Scale Shaking Table Model Test of the Shallow-Bias Tunnel with a Small Clear Distance

Wang, Feifei; Jiang, Xueliang; Niu, Jiayong

doi:10.1007/s10706-017-0166-3

Cited by 35 publications

(13 citation statements)

References 7 publications

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“…e stability of rock slope is also related to different types of rock [12,13]. e slope stability comparison between those only applied static load and those count for the extra impacts from earthquake [14][15][16]. e microstructure of the rock-soil in the dump has significant influence on the stability of dump [13,[17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Sample Rocks Tests and Slope Stability Analysis of a Mine Waste Dump

Ping-hua

Zhao

Meng

et al. 2018

Advances in Civil Engineering

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The safety and stability of waste dump are vital influencing factors to the mine sustainability and mine employees. Based on a real mine project in a certain open-pit mine waste dump in Tibet, the in situ test on waste rocks from waste dump, including measurements of density, water content, rock size, and natural repose angle, was conducted. Afterwards, these sample waste rocks, of which grain size is less than 5 cm, were selected for indoor large-scale shear test under natural and saturated conditions. By using some engineering methods, the physical and mechanical parameters of waste rocks layer were then determined accordingly. MIDAS-GTS/NX has the advantage of pre-processing modeling. FLAC3D has good computational and analytical capabilities. The process of dump accumulation is simulated numerically. According to the calculation results of FLAC3D, the distribution of stress, displacement and plastic zone in the dump is obtained. FOS (factor of safety) for each analytical step in this model was then calculated through the strength reduction method. The limit equilibrium method is used for waste dump stability analysis considering three states: only applied gravity, applied gravity and rainfall, and applied gravity and underground water. The results from this analysis show that the waste dump is stable. The potential failure modes of waste dump mainly consist of the “combined sliding mode” which has circular sliding in upper side and broken line sliding that cuts through gravel-soil layer into heavily weathered layer in the bottom. This paper documents some of the procedures and approaches utilized for waste dump life-of-mine design analysis. It provides reference for further waste dump optimization.

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Section: Introductionmentioning

confidence: 99%

Sample Rocks Tests and Slope Stability Analysis of a Mine Waste Dump

Ping-hua

Zhao

Meng

et al. 2018

Advances in Civil Engineering

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“…A layer of PVC lm was pasted on the polystyrene foam board at the left and right sides of the model box. e boundary of the model was dealt within literature [37,38].…”

Section: Time History Analysismentioning

confidence: 99%

Parameter Sensitivity of Shallow‐Bias Tunnel with a Clear Distance Located in Rock

Jiang

Wang

Yang

et al. 2018

Advances in Civil Engineering

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In order to obtain the seismic internal force response laws of a shallow-bias tunnel with a small clear distance, the reliability of the numerical simulation is verified by the shaking table model test. e parameter sensitivity of the tunnel is studied by using MIDAS-NX finite element software. e effects of seismic wave peak (0.1 g, 0.2 g, 0.3 g, 0.4 g, 0.5 g, and 0.6 g), existing slope angle (30°, 45°, 60°, and 90°), clear distance (1.0 D, 1.5 D, 2.0 D, and 3.0 D), and excitation mode (X direction, Z direction, XY direction, and XYZ direction) on the internal force response law of the tunnel are studied, respectively. e results show that (1) the shear force gradually increases with the increasing of seismic peak. e amplification is different with different measuring points. (2) Under different existing slope-angle conditions, the variation trend of shear force of the tunnel is similar, but the shear force is different. e existing slope has significant effect on the shear force response of the tunnel, and the degree is different with different slope angles. (3) Under the conditions of 1.5 D and 2.0 D, the shear force response of the tunnel is stronger, but the response of other conditions is relatively weak. e tunnel with 1.5 D to 2.0 D clear distance should be avoided. Different excitation modes have a significant effect on the shear force response of the tunnel. (4) Under the same excitation mode, the different excitation directions also have a significant effect on the shear force response. (5) e shear force response of the tunnel crosssection shows nonlinear variation trend. e shear force response is strongest at the arch shoulder and arch foot of the tunnel. e research results provide a useful reference for the design of antishock and vibration resistance of the tunnel.

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“…In both cases there was no significant change in the peak dynamic strain of the inverted arch on two sides of the flexible joints. Wang et al [19] also adopted the above-mentioned definition of the horizontal and vertical strategies and investigated experimentally two shallow-bias tunnels with a small clear distance subjected to the horizontal-vertical earthquake excitations with different levels. Results show that the acceleration amplification factors of the vertical-direction were generally larger (1.02-3.94 times) that that of the horizontal-direction and the earthquake intensity presented different influence on the acceleration responses in the horizontal and vertical directions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessment of the Effect of Vertical Earthquake Motion on Underground Metro Station

et al. 2019

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This paper presents experimental assessment of the effect of the ratio of vertical to horizontal peak ground acceleration (RVH) on underground metro station. An atrium-style metro station embedded in artificial soil subjected to earthquake loading is examined through shaking table tests. The experimental results for three different RVH, including soil acceleration, soil-structure acceleration difference, dynamic soil normal stress (DSNS), and structural dynamic strain, are presented and the results are compared with the case of horizontal-only excitation. It is found that for an atrium-style metro station, the differences in horizontal acceleration amplitude between the structure and the adjacent soil rise with increasing RVH, which are different at different depths. The most significant differences occur at the depth of the ceiling slab. It is also observed that both the amplitude and distribution of peak DSNS have obvious differences between the left and right side walls at all levels. It is therefore concluded that the RVH has a significant influence on dynamic soil-structure interaction. It is believed that under extreme earthquake loading, such as near fault zones, RVH is a parameter of paramount importance and should be accounted for in the seismic analyses and seismic performance assessments of underground structures, especially for those with zero or near-zero buried depth, such as atrium-style metro stations.

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The Large-Scale Shaking Table Model Test of the Shallow-Bias Tunnel with a Small Clear Distance

Cited by 35 publications

References 7 publications

Sample Rocks Tests and Slope Stability Analysis of a Mine Waste Dump

Sample Rocks Tests and Slope Stability Analysis of a Mine Waste Dump

Parameter Sensitivity of Shallow‐Bias Tunnel with a Clear Distance Located in Rock

Experimental Assessment of the Effect of Vertical Earthquake Motion on Underground Metro Station

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