De Shen Zhao

Study on Surface Subsidence and Separation Range Thick Seam Mining of Daping Mine

In order to study the surface subsidence and separation range features during the mining process in in thick seam mining of Daping mine , it takes the typical coal of mining in S2S9 face of Daping Mine, using the resemble simulation to study on it. The study showed that the subsidence amounted to less than the maximum under the geological and mining conditions, In the single-face mining conditions, when the face length is generally not more than (1/3-1/4) H.The mining thickness cannot deflection in the form completely transmitted to the surface, but abound in overburden bed rock mass formed within the fracture and caving into the residual space. This research can be a reference for safety and high efficient coal mining of other working face in Daping Coal Mine.

Impact and Safety Assessment of a Double-Tube Parallel Tunnel Excavation on Adjacent Pipelines

The interaction of a double-tube parallel tunnel excavation will have a larger additional shearing action on the adjacent pipelines. This paper, taking 202 Section of Line 2 on Dalian Metro as the background, uses the finite difference software to establish 3-D finite element analysismodel to simulate the double-tube parallel tunnel excavation. Deformation of adjacent pipelines is analyzed specially by numerical simulation of tunnel excavation and also the safety of the pipelines is forecasted. The conclusions and advices are important to design and guide the actual project construction safety.

Numerical Simulation on Effect of Shield Tunnel Construction on Pipelines with 45* Skew Angle and Tunnel

Shield tunnel construction cause soil movement to harm the adjacent underground pipelines. This paper, taking Dalian Spring Street subway station as the background, uses the finite difference software to establish 3-D finite element analysis model to simulate the deformation of pipeline with 45* skew angle in the tunnel construction work. The results show: when the left tunnel push towards pipelines, due to the skew of the pipeline and tunnel, vertical displacement of pipelines is a certain shift to the left. When the right tunnel excavation is complete, the pipeline maximum settlement has a return to the center of the two tunnels. The settlement of pipeline is much bigger than horizontal displacement.

Analysis of Soil Disturbance by Shield Tunneling

The shield tunneling will be bound to disturb surrounding strata, induced stress redistribution in soil, soil deformation and surface subsidence. We analyzed characteristics of soil disturbance by shield tunneling with numerical simulation. To provide technical support for the future urban shield tunnel construction. It shows practically significant in studying shield tunnel construction.

Study on Influencing Factor of Ground Deformation Induced by Shield Tunneling

The complex construction behavior inevitably disturb surrounding environment, even when the tunneling goes through building, which may be wrecked. The security issues of the subway project stems from ground movement and structure dynamic interaction. So it is academic and application good value for study on construction influences of shield tunnel excavation to the neighboring buildings. This paper focuses on the shield tunnel construction strata deformation factors. The results provided the theory basis for safety construction.

Analysis of Three-Dimensional Numerical Simulationin on Overlying Strata’s Stress Field and Displacement Field in Thick Seam Mining

It takes the typical coal of mining in S2S9 face of Daping mine, using the 3-D numerical simulation to reveal on its face with the vertical characteristics of the stress field and displacement field .The study showed that the overburden strata migration features during the mining process in in thick seam mining of Daping mine.This research can be a reference for safety and high efficient coal mining of other parts of the soft overburden in extra- thick seam mining technology.

Application of Entropy-Weight Hierarchy Analysis on Study of Height Prediction of Water Conducted Zone

Based on actual measurement data in Da Ping as the samples,according to the experience, and ends with calculate every factors weight and height prediction of the water conducted zone by Matlab using the combination entropy-weight method and analytic hierarchy process. this paper introduces a comprehensive prediction model consisting of analytic hierarchy process and combination entropy-weight method. The method,overcoming weights imbalance,gives the evaluation result better than does the single analytic hierarchy process, it is a new valid method for scientific forecast on water conducted zone.

Numerical Simulation of Failure of Overburden in Coal Mining under Reservoir

The Water-flowing fractured zone’s height and its distribution has an important effect on stability of the surrounding rock and the safety in the subsequent production under reservoir. In the paper the Drucker-Prager yielding law is used. The limit value of tensile stress and shear stress is used to judge the water-flowing fractured zone’s height and its distribution. The fitting formula is obtained by origin software under different advance of the work face. The peak value of horizontal movement is 1.13m. The symmetrical subsidence basin is formed in the center of work face. The peak value of subsidence is 3.86m. The sum of surface subsidence accounts for about 43 percent of the mining height. The advance of around 300m is the distance that the water flowing fractured zone’s height reaches the highest value. The biggest height of water- flowing fractured zone is 146m.