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

Jiang, Xueliang; Wang, Feifei; Yang, Hui; Niu, Jiayong

doi:10.1155/2018/5791354

Cited by 11 publications

(7 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…A reasonable safety control range must be determined during blasting construction of a new tunnel. e vibration response of the existing tunnel below must also be monitored to ensure the safety of the existing tunnel [16][17][18][19]. is study used onsite monitoring of the existing tunnel in the cross-section.…”

Section: Tunnel Blasting Vibration Monitoringmentioning

confidence: 99%

Influence of Small, Clear Distance Cross-Tunnel Blasting Excavation on Existing Tunnel below

Duan

Gong

et al. 2019

Advances in Civil Engineering

View full text Add to dashboard Cite

The vibration effect generated during tunnel excavation can influence or damage adjacent tunnels. Studying and controlling the blasting vibration effect has important theoretical and practical significance, especially for new tunnels. This paper takes the tunnel project of Gao Jiu Lu-Jia Hua Cross Tunnel in Chongqing as the research background and assesses the blasting vibration influence in the up-down cross-tunnel. Onsite monitoring and numerical simulation were used to analyze peak particle velocity (PPV) changes, stress distribution, and crown settlement during the excavation process of Gao Jiu Lu I Tunnel at Jia Hua Tunnel Left Line in the cross-section. Influence laws of blasting excavation in a small, clear distance cross-tunnel on an existing tunnel below were obtained. Results show that new tunnel blasting vibrations exerted the largest influence on the crown of the existing tunnel below in the cross-section. The maximum tensile stress of the secondary lining of the existing tunnel below was mainly concentrated in the crown area. The maximum compressive stress during excavation was concentrated in the crown foot, and the stress value was less than the tensile and compressive strength of the concrete. The loosening of the surrounding rock from blasting excavation of the new tunnel caused secondary settlement of the existing tunnel crown below. The cumulative settlement value at the cross-section of the two tunnels was the largest. With an increase in axial distance from the cross-section of the existing tunnel crown, the settlement value gradually declined and became stable. These research results have reference value for the construction of a small, clear distance cross-tunnel and provide theoretical guidance for similar tunnel excavation projects in the future.

show abstract

“…Analysis of dynamic time history using Newmark method with better convergence in MIDAS-GTS/NX. The basic integral method is as follows [26]:…”

Section: Numerical Simulationmentioning

confidence: 99%

Acceleration and displacement dynamic response laws of a shallow-buried bifurcated tunnel

Wang¹,

Ren²,

Ping-hua³

et al. 2019

J. vibroeng.

Self Cite

View full text Add to dashboard Cite

In order to obtain the seismic dynamic laws of the acceleration and displacement of a shallow-buried bifurcated tunnel, the analysis of the numerical simulation was carried out by MIDAS-GTS/NX software. The results of the numerical simulation were verified by a shaking table model test. The results show that: (1) the numerical simulation and shaking table test coincide with each other in terms of variation law and peak value. The results of the numerical simulation are credible. (2) For different tunnel cross-section, the response of acceleration and displacement are significant difference. (3) The seismic response of the small distance tunnel (Section 6) is intense. The seismic response laws of the small distance tunnel are significant difference from other type tunnels. The seismic response of the measuring point at the middle rock column is intense. (4) Along the axis of the tunnel, the displacement of the tunnel firstly increases and then decreases. The displacement of the measuring point at the middle rock column is intense, which is in accordance with the law of the acceleration response. The seismic response laws of the tunnel are significantly affected by the middle rock column. The section structure size has a significant effect on the dynamic response of the tunnel.

show abstract

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

Cited by 11 publications

References 34 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

Influence of Small, Clear Distance Cross-Tunnel Blasting Excavation on Existing Tunnel below

Acceleration and displacement dynamic response laws of a shallow-buried bifurcated tunnel

Contact Info

Product

Resources

About