Numerical Investigation of the Dynamic Response of Tunnel Structure and Surrounding Rock Mass to Seismic Loads Based on DEM Simulation

In recent years, with the increasement of the railway expansion projects, the blasting damage has caused great threat to the safety of the existing tunnel structure. However, few researches are carried out on the influence of tunnel blasting construction on existing small-angle crossing tunnel structure. In this study, the dynamic response of existing tunnel structure to the blasting activities in newly built tunnel is analyzed by numerical simulation. From the comparison of vibration velocity, lining stress, and the displacement of the existing tunnel structure, the blasting methods, surrounding rock condition, cross angle, and clear distance are proven to be the highly correlated factors for the dynamic response of the existing tunnel to blasting. Then, combined with the analytic hierarchy process, the vibration velocity is selected as the optimal index to indicate the dynamic response to blasting activities.

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Numerical Investigation of Dynamic Response of Deploying System during a Circular Cylinder Lowering through Air-Water Interface

International Journal of Fluid Mechanics Research ◽

10.1615/interjfluidmechres.v42.i3.10 ◽

2015 ◽

Vol 42 (3) ◽

pp. 191-205 ◽

Cited By ~ 1

Author(s):

Xiaozhou Hu ◽

Shaojun Liu

Keyword(s):

Circular Cylinder ◽

Dynamic Response ◽

Numerical Investigation ◽

Water Interface ◽

Air Water Interface

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Influence exerted by underground excavation shape and by effective stresses on the formation of a tensile strain zone at a depth greater than 1 km

MINING INFORMATIONAL AND ANALYTICAL BULLETIN ◽

10.25018/0236-1493-2020-6-0-67-75 ◽

2020 ◽

pp. 67-75

Author(s):

Van Min Nguyen ◽

V. A. Eremenko ◽

M. A. Sukhorukova ◽

S. S. Shermatova

Keyword(s):

Rock Mass ◽

Cross Sections ◽

Tensile Strain ◽

Rock Fracture ◽

Strain Analysis ◽

Surrounding Rock ◽

Underground Excavation ◽

Secondary Stress ◽

Principal Stresses ◽

Mining Depth

The article presents the studies into the secondary stress field formed in surrounding rock mass around underground excavations of different cross-sections and the variants of principal stresses at a mining depth greater than 1 km. The stress-strain analysis of surrounding rock mass around development headings was performed in Map3D environment. The obtained results of the quantitative analysis are currently used in adjustment of the model over the whole period of heading and support of operating mine openings. The estimates of the assumed parameters of excavations, as well as the calculations of micro-strains in surrounding rock mass by three scenarios are given. During heading in the test area in granite, dense fracturing and formation of tensile strain zone proceeds from the boundary of e ≥ 350me and is used to determine rough distances from the roof ( H roof) and sidewalls ( H side) of an underground excavation to the 3 boundary e = 350me (probable rock fracture zone). The modeling has determined the structure of secondary stress and strain fields in the conditions of heading operations at great depths.

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