Study on Vibration Displacement of Ground Building Caused by Construction of Shallowly Bored Tunnel with Drill and Blast Method

2013 ◽  
Vol 838-841 ◽  
pp. 1359-1362
Author(s):  
Xiao Jun Zhou ◽  
Qi Sheng ◽  
Rui Guo
Keyword(s):  
Differential Equation ◽  
Mathematical Expression ◽  
Horizontal Displacement ◽  
Surrounding Rock ◽  
Rock Blasting ◽  
Blast Vibration ◽  
Vibration Displacement ◽  
Mathematical Formula ◽  
Main Factors ◽  
Drill And Blast

A mathematical formula to calculate relative horizontal displacement of ground building due to blast vibration of surrounding rock for bored tunnel by drill and blast method is propounded on the basis of differential equation for dynamic vibration, and the mathematical expression is deduced by means of Laplace transforms. The main factors which influence the horizontal displacement of ground building subject to rock blasting are also discussed in the paper.

Numerical Prediction of Rock Fracturing During the Process of Excavation

2012 ◽  
pp. 225-237 ◽  
Author(s):  
Zhangtao Zhou ◽  
Zheming Zhu ◽  
XinXing Jin ◽  
Hao Tang
Keyword(s):  
Equation Of State ◽  
Numerical Model ◽  
Failure Criterion ◽  
Material Properties ◽  
Igneous Rock ◽  
Surrounding Rock ◽  
Rock Blasting ◽  
Rock Fracturing ◽  
Fracturing Process ◽  
Blasting Excavation

During the process of excavation, blasting can induce cracking inside the surrounding rock. Considering the effects of material properties and loading conditions, a rock blasting excavation model with two successive excavation steps was developed through the use of AUTODYN code. Four kinds of equation of state (EOS), linear, shock, JWL, and compaction were applied to the materials employed in this numerical model. A modified principal stress failure criterion was applied to determining material statuses, and TNT explosive and a relatively homogeneous igneous rock, diorite, were used in this numerical model. By using this numerical model, rock fracturing process during blasting excavation was simulated, and rock fracturing process during two successive excavations is presented.

Research on Mining Technological Parameters of 7# Thin Coal Seam in Liuquan Mine

2012 ◽  
Vol 629 ◽  
pp. 937-942
Author(s):  
Dong Sheng Zhang ◽  
Xu Feng Wang ◽  
Yang Zhang ◽  
Jin Liang Wang
Keyword(s):  
Coal Seam ◽  
Distinct Element ◽  
Horizontal Displacement ◽  
Simulation Software ◽  
Surrounding Rock ◽  
Technological Parameters ◽  
Thin Coal Seam ◽  
Geological Conditions ◽  
Universal Distinct Element Code ◽  
Distinct Element Code

Aimed at the specific geological conditions of 7# thin coal seam in Liuquan Mine, this paper used the methods of numerical calculation and theoretical analysis to determine the reasonable technological parameters of high-grade conventional mining face. The numerical simulation software of UDEC (Universal Distinct Element Code) was used to contrast and analyse the characteristics of surrounding rock stress distribution and overlying rock horizontal displacement under the condition of different length of coalface, then it was indicated that the surrounding rock deformation was less when length of coalface was 110 m which was advantageous for roof control; according to the conditions of roof and floor, the roof support strength was being calculated systematically to determine the row space of props being 700×1200 mm; the main equipments of coalface was assorted, and reasonable work manner in coalface and gob processing measure was put forward, which provided guidance for efficient mining in thin coal seam.

Deep Foundation Pit Monitoring Based on CX-3C Inclinometer

2014 ◽  
Vol 484-485 ◽  
pp. 404-407 ◽  
Author(s):  
Qing Guo Ren ◽  
Guang Zhang ◽  
Xiao Guang Yue ◽  
Wen Cheng Liao
Keyword(s):  
Vertical Profile ◽  
Retaining Wall ◽  
Horizontal Displacement ◽  
Displacement Monitoring ◽  
Deep Soil ◽  
Security Risks ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Main Factors

Deep soil horizontal displacement monitoring can measure the retaining wall board, row piles deformed shape, reflect the foundation on the vertical profile of horizontal displacement with depth changes in the law, predict foundation stability and security risks. Combined with Wuhan WANGJiaDun Pit Engineering, this article introduce CX-3C inclinometer work principle, put forward the calculated optimization measures of inclinometer, and analysis the main factors which should be considered to arrange the measuring points.

Analysis of the Rayleigh pulse

Geophysics ◽  
1989 ◽  
Vol 54 (5) ◽  
pp. 654-658 ◽  
Author(s):  
P. Hubral ◽  
M. Tygel
Keyword(s):  
Wave Propagation ◽  
Spectral Properties ◽  
Mathematical Expression ◽  
Phase Spectrum ◽  
Mathematical Formula ◽  
Propagation Modeling ◽  
Seismic Wavelet ◽  
Frequent Use ◽  
Minimum Number ◽  
Wave Propagation Modeling

Seismologists make frequent use of wavelets (also referred to as signals, signatures, or pulses), particularly in such fields as seismic filtering, wavelet processing, wave‐propagation modeling, and trace inversion. Whenever possible, the actual seismic wavelet of the real source should be considered (Hosken, 1988). However, frequently, particularly in wave‐propagation modeling, one must consider a synthetic source wavelet. This should, if possible, be given by a simple mathematical formula and possess an easy description for its most important spectral properties (e.g., amplitude and phase spectrum, main frequency, Hilbert transform, etc.). Moreover, the mathematical expression should be such that with a minimum number of parameters a large flexibility in the form of the wavelet can be obtained.

Influence of Side-Pressure Coefficient on Deformation of Tunnel Surrounding Rock and Bolt Axial Force

2015 ◽  
Vol 741 ◽  
pp. 138-142 ◽  
Author(s):  
Feng Hai Ma ◽  
Yan Wang ◽  
Zhi Bin Wang
Keyword(s):  
Axial Force ◽  
Lateral Pressure ◽  
Pressure Coefficient ◽  
Side Wall ◽  
Horizontal Displacement ◽  
Internal Force ◽  
Surrounding Rock ◽  
Lateral Pressure Coefficient ◽  
Finite Element Software ◽  
Side Pressure

Internal force and deformation of surrounding rock and supporting structure of the nonlinear research is the use of finite element software ADINA by ideal elastic-plastic constitutive model.Results show that the lateral pressure coefficient increased from 0 to 1, and even decrease sharply arch sedimentation of surrounding rock, side wall horizontal displacement towards the hole along the radial direction development gradually reduced to 0 and reverse to the hole, when the lateral pressure coefficient is less than 0.5, bolt axial force biggest change is not obvious, when lambda increases gradually, the largest bolt axial force significantly increased.

The Mechanical Mechanism of Hulking Force Stable Principle of Surrounding Rocks in Soft Rock Roadway

2014 ◽  
Vol 1065-1069 ◽  
pp. 830-834
Author(s):  
Wei Pei Xue ◽  
Lai Wang Jing
Keyword(s):  
Stress State ◽  
Ultimate Strength ◽  
Soft Rock ◽  
Reference Value ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Support Mechanism ◽  
Rock Creep ◽  
Main Factors

This paper aims to reveal the important role of the hulking force in stabilizing the roadway. After introducing the three ultimate strength of the foundation rock upon, starting from the perspective of stress state, the article on the deformation area surrounding rock for a more reasonable division, and thus gives the main factors roadway deformation.Introduced in the basis of the three ultimate strength of the rock, from the perspective of stress state, deformation of roadway surrounding rock area to carry on the reasonable division, and then the main factors of roadway deformation is presented. Second, through the analysis of the formation of the hulking force, analysis of hulking force inhibition of surrounding rock creep mechanism of dynamic mechanics,and analysis of the hulking force to improve the effect of supporting mechanics mechanism. Describes the important role of the hulking force on the stability of surrounding rock. Finally, Huaibei Coal Mining Co., 8203 guobei roadway industrial test site, Demonstrates the effectiveness of the principle. Results of this study have important reference value to change the current research in deep coal mine deep soft rock and loose seam roadway support mechanism and technology.

scholarly journals Formation temperatures

1982 ◽  
Vol 8 ◽  
pp. 71-73
Author(s):  
Peter Klint Jensen
Keyword(s):  
Surrounding Rock ◽  
Temperature Gradients ◽  
Source Rocks ◽  
Formation Temperature ◽  
Factors Affecting ◽  
Sedimentary Sequences ◽  
Borehole Temperatures ◽  
Natural Temperature ◽  
Main Factors ◽  
Geological Formations

Borehole temperatures have been studied to evaluate the natural temperature field of the geological formations (fig. 37). Formation temperature and time are main factors affecting maturation of source rocks and should, therefore, be compared with maturation measurements. Furthermore, temperature gradients through sedimentary sequences provide information about relationships between their heat conductivities, and this can be used to extrapolate temperatures measured in wells to the surrounding rock masses.

scholarly journals Numerical Simulation of Ultra-Shallow Buried Large-Span Double-Arch Tunnel Excavated under an Expressway

2021 ◽  
Vol 12 (1) ◽  
pp. 39
Author(s):  
Jianxiu Wang ◽  
Ansheng Cao ◽  
Zhao Wu ◽  
Zhipeng Sun ◽  
Xiao Lin ◽  
...  
Keyword(s):  
Fracture Zone ◽  
Horizontal Displacement ◽  
Surrounding Rock ◽  
Spatial Effects ◽  
Partition Wall ◽  
Tunnel Support ◽  
Large Span ◽  
Construction Design ◽  
Excavation Process ◽  
Fault Fracture Zone

The temporal and spatial effects of a complicated excavation process are vital for an ultra-shallow buried large-span double-arch tunnel excavated under an expressway in service. Numerical simulations are urgent and necessary to understand the effect of the total construction process. Taking Xiamen Haicang tunnel as a research object, the total excavation process of three pilot tunnels and the three-bench reserved core soil method of an ultra-shallow buried large-span double-arch tunnel with a fault fracture zone under an expressway was simulated using software FLAC3D. The deformation of the surface, surrounding rock, underground pipelines, tunnel support structure and partition wall of the three pilot tunnels and the main tunnel was analyzed, and the dangerous areas and time nodes were obtained. When the tunnel was excavated to the fault fracture zone, the deformation of the surface and surrounding rock increased significantly. The rock and soil within 20 m behind the excavation surface of the pilot tunnel were greatly disturbed by the excavation. During the excavation of the main tunnel, the horizontal displacement of the middle partition wall moved slightly towards the main tunnel excavated first. The research results can provide a reference for the construction design of double-arch tunnels.

scholarly journals Effect of Initiation Location within Blasthole on Blast Vibration Field and Its Mechanism

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Qidong Gao ◽  
Wenbo Lu ◽  
Zhendong Leng ◽  
Zhaowei Yang ◽  
Yuzhu Zhang ◽  
...  
Keyword(s):  
Detonation Wave ◽  
Forward Direction ◽  
Phase Delay ◽  
Cylindrical Charge ◽  
Blast Vibration ◽  
Vibration Field ◽  
Delay Effects ◽  
Acting Mechanism ◽  
Experimental Approaches ◽  
Drill And Blast

In drill and blast, the explosive filled in each blasthole is cylindrically shaped and generally initiated by the detonator. Thus, the effect of the initiation location must be addressed, as it determines the detonation direction along the entire column explosive. In this paper, the effect of the initiation location on blast vibration field and its acting mechanism were comprehensively investigated through the theoretical, computational, and experimental approaches. The results indicate that the initiation location plays an important role in the blast vibration filed of the cylindrical charge. The underlying effect of the initiation location can be regarded as the combined results of the energy distribution and phase delay effects of the column explosive source. The behavior of the rock mass in the single-hole blasting experiment demonstrates that the explosion energy is preferentially transmitted to the forward direction of the detonation wave. The seed wave-based computation model verifies that owing to the phase delay effect, the blast vibration field of the cylindrical charge is not uniformly distributed and is strengthened at the forward direction of the detonation wave. The production blasting experiment indicates that the ground PPV under bottom initiation is 61.3%∼211.7% larger than that under top initiation. In addition, the effect of the initiation location is sensitive to the charge length L and the denotation velocity D. Meanwhile, the effect of the initiation location vanishes with distance. The present study provides valuable reference for understanding the effect of the initiation location on blast vibration in drill and blast.

scholarly journals Parameter optimization of double side wall method for soft surrounding rock tunnel

2019 ◽  
Vol 136 ◽  
pp. 04021
Author(s):  
Zhihua Yang ◽  
Rumiao He ◽  
Ke Li ◽  
Hongyan Guo
Keyword(s):  
Side Wall ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Surrounding Rock ◽  
Radius Of Curvature ◽  
Tunnel Excavation ◽  
The Stability ◽  
Rock Tunnel ◽  
Double Wall ◽  
Wall Method

When the Xiaojiazhai tunnel is constructed by the double-wall method, different curvature radii have different effects on controlling the stability of the surrounding rock and speeding up the construction progress. By numerically simulating the tunnel excavation under different radius of curvature, it is concluded that R is adopted respectively. The deformation displacement of surrounding rock is =11.6m∠520 and R=5.76m∠1060. The maximum horizontal displacement and vertical displacement are smaller when R=5.76m∠1060 is selected. According to the analysis results, when R=5.76m∠1060 is selected, the deformation of surrounding rock can be controlled to ensure the safety of construction and provide reference for future construction.

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