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Li K.,Kunming University of Science and Technology | Li K.,Key Laboratory For The Exploitation Of Southwestern Rsrc And The Environmental Disaster Control Engineering | Hou K.,Kunming University of Science and Technology
Disaster Advances | Year: 2012

A underground metal mine plan to stope the orebodies was abandoned by the former private mining. But a township highway, which is called as Jingmin road, is just above the orebody and the distance between them is only 40-50m. In order to ensure secure operation of the road, it is important to study the subsidence law of road surface during the mining which contributes to optimize the stoping scheme. So, on the basis of determining the rock mass macro mechanical parameters, the subsidence law, influence range and overlying rock stability at different mining plan are analyzed with the various numerical simulation methods such as 2D-BLOCK 3D-σ Flac3D. The simulation results show that the subsidence height of road surface is increased nonlinearly with the increasing of exploitation height. If the whole orebody is mined, the maximum sinking height will be up to 1.4m and now the Jingmin road has already destroyed. Only the when stoping level is less than 1300m, the safety of road can be guaranteed.

Lin X.,Key Laboratory For The Exploitation Of Southwestern Rsrc And The Environmental Disaster Control Engineering | Lin X.,Chongqing Jiaotong University | Yu Q.,Chongqing Jiaotong University
Lecture Notes in Electrical Engineering | Year: 2012

In China, Slopes along highway in mountainous area are very much and their distributing is wide, also the slopes are affronting geological environment and the naissance of them are double-quick. It is difficult that evaluate the stability of the slopes along highway at present. The design and realize of slope safety assessment system along highway in mountainous area are described. In holistic safety assessment subsystem, the importance arrangement of various indexes can be made based on simple dependent function and the analytic hierarchy process and expert reliability based on the matter element analysis theory to revise the weights of index. Also, the way of matter-element extension to build matter element extension model for high slope along highway in mountainous area are imposed. In local safety division subsystem, through coupling the unified strength theory and the Lode stress parameters, the mathematic model is established for calculating the local safety and stability of the high slope along highway in mountainous area. Based on ArcGIS9.3, the high slope data are pre-processed and analyzed. And by using the finite element analysis software, the study profiles of high slope are numerical simulated. The relevant parameters of each node of the studied profiles are acquired. Then the stimulation results are further analyzed and visualized by ArcGIS9.3. Finally, the safety division maps of the study profiles are obtained. The result indicated that the compositive system can provide veracious information for slope safety and straightway roads. © Springer-Verlag Berlin Heidelberg 2012.

Zhao T.,Shandong University of Science and Technology | Tan Y.,Shandong University of Science and Technology | Liu S.,Shandong University of Science and Technology | Chen Y.,Jinan Time Assay Testing Machine Co. | And 2 more authors.
ICMHPC - 2010 International Conference on Mine Hazards Prevention and Control | Year: 2010

In order to reveal deformation laws of anchored rock under long-term loads, in this paper, creep mechanical characteristics of anchored rock are analyzed, and anchorage constitutive model considering time effect is initially studied based on laboratory tests. Red sandstone of good homogeneity is used as anchored matrix, bamboo as the anchor, mixture of barite powder and rosin alcohol as the binder, then anchored red sandstone is made according to the similar criteria. Non-anchored and anchored specimens' indoor long-time (above 100h) creep test is conducted by RLJW-2000 rheology tester, The results show that, creep stress threshold of anchored rock is increased by about 30%σc, creep deformation at different stress level stage is significantly controlled, and anchored specimen's long-term intensity is increased by 5%∼10%σ c, which still has some capacity after destroyed. In addition, starting from the overall mechanical effect of anchor's reinforcement to rock, according to equivalent co-deformation principle, one-dimensional creep constitutive equation of anchored rock is established, the answer of anchored generalized Kelvin (B-K) model is derived and control mechanism on creep deformation of rock by bolt is analyzed. © Atlantis Press, 2010.

Sun X.,Shijiazhuang University | Sun X.,China University of Mining and Technology | Sun X.,Key Laboratory For The Exploitation Of Southwestern Rsrc And The Environmental Disaster Control Engineering | Cheng J.,China University of Mining and Technology | And 2 more authors.
International Journal of Modelling, Identification and Control | Year: 2012

The parameters such as the length of rock bolts, anchorage length, free length or construction defects (e.g., the position of less density in anchorage body) are important to evaluate the quality of rock bolts. Because of the harsh environment, the measured signal includes many kinds of noise, which have a great effect to the signal. It is difficult to detect the signal effectively by traditional information processing technology, and therefore the new information processing technology based on non-destructive detecting is provided. The steps are as follows: first, excite rock bolts using pseudo-random signal, then acquire the reflection signal and transmit to a computer, and remove the reflection signal noise using the Hilbert-Huang transform method and extract the characteristic value, finally, calculate the parameters of rock bolts using cross-correlation method and complete detection of rock bolts. Experimental results show that the effect of the above detection method is better than traditional correlation method. Copyright © 2012 Inderscience Enterprises Ltd.

Sun X.Y.,Shijiazhuang University | Sun X.Y.,China University of Mining and Technology | Sun X.Y.,Key Laboratory For The Exploitation Of Southwestern Rsrc And The Environmental Disaster Control Engineering | Liu D.H.,Hebei University of Science and Technology | And 2 more authors.
Proceedings of the 2012 International Conference on Industrial Control and Electronics Engineering, ICICEE 2012 | Year: 2012

A type of portable rock bolt nondestructive detecting system is designed, which is based on the ARM and Windows CE operating system. In hardware design, the signal acquisition module, A/D conversion module, LCD module and the power module are introduced respectively. In software design, the Windows CE operating system customization and the design applications program are completed. Proved by the experiment, the system has a good application prospect in paractical application. © 2012 IEEE.

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