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Li B.,Chinese Academy of Geological Sciences | Wang G.,Shanghai JiaoTong University | Feng Z.,Chinese Academy of Geological Sciences | Wang W.,China Institute of Geological Environment Monitoring
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

The rockslide of the steeply inclined rock layer at Jiguanling in Wulong, Chongqing was studied. FLAC3D was used to simulate the progressive failure process of the steeply inclined rocks induced by underground mining, i.e., from the rock bending, to interbed shearing, toppling, toe breakout and finally sliding. It was considered that the rockslide at Jiguanling exhibited a compound failure mode of stratified rock mass with toppling and sliding. Simulation results showed that: (1) Under the long-term gravitational effect, the steep slope creeped along the mountain ridge and tensile cracks were gradually produced. Meanwhile, due to the slope situated near the anticline core areas, the stress concentration resulted in the bending deformation of the covering strata. (2) The long-term karstification accelerated the development and widening of slope fissures. (3) The coal mining induced the stress redistribution at Jiguanling mountain ridge, the stratum separation occurred gradually in the overlying rock mass, cracks were formed in the underlying rock mass, and the strength of rock mass was gradually reduced. (4) And after the gradual mining out of coal, the deformation of overlying rock mass increased sharply till the toppling and failure occurred, which squeezed the underlying rock mass and led to the shear failure and finally the collapse-debris flow was formed. ©, 2015, Academia Sinica. All right reserved. Source


Li B.,Chinese Academy of Geological Sciences | Wang G.-Z.,Shanghai JiaoTong University | Feng Z.,Chinese Academy of Geological Sciences | Wang W.-P.,China Institute of Geological Environment Monitoring
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

With regard to the obvious three-dimensional characteristics for most natural stratified rock landslides, based on the two-dimensional derivation method for toppling-failure limit equilibrium considering three-dimensional stress state of stratified rock slope, simplification and equivalence are carried out of three-dimensional force system, and the toppling analysis method for three-dimensional stress is proposed. In the analysis of toppling limit equilibrium considering apparent dip, the stratified rock slope can be seen as cantilever beams. The landslide of Chongqing Jiguanling is taken as an example for verification and analysis. The calculated results show that: (1) Under the natural state, Jiguanling slope is in a stable state; (2) Under the underground mining state, overburden rocks of Jiguanling coal seam show toppling and failure layer by layer, and extrude the underlying anti-skid key blocks, leading to landslide after shear and failure of key blocks. The analysis results are basically consistent with the actual situation. ©, 2015, Chinese Society of Civil Engineering. All right reserved. Source


Li B.,Chinese Academy of Geological Sciences | Liu R.-Q.,Changan University | Feng Z.,Chinese Academy of Geological Sciences | Wang W.-P.,China Institute of Geological Environment Monitoring
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

In order to study the strength and deformation characteristics of Q3 sand loess from Heifangtai, Yongjing, Gansu province, using the true triaxial apparatus developed by Xi'an University of Technology, true triaxial tests are carried out under conditions of different confining pressures (50, 100, 200 kPa), ratios of intermediate principal stress (b=0, 0.25 and 0.5) and water contents (5%, 10% and 15%). The test results illustrate that: (1) The shear failure modes of Q3 sand loess are displayed by lateral bulge failure and monolete shear failure under the true triaxial conditions; and there are other modes for few soil samples including taper failure, double-slit shear failure and T-shape shear failure. (2) The deviatoric stress difference of Q3 sandy loess increases with the ratio of intermediate principal stress when the confining pressure and moisture content are the same, while the ratio of intermediate principal stress (b) is different. Meanwhile, the stress-strain relationship curve shows hardening and obvious shear dilatancy phenomenon. However, the ratio of intermediate principal stress effects the relationship between generalized shear stress and generalized shear strain; the relation curve increases accordingly with the increase of b. With the increase of b, the strength decreases; and the relation curve between the generalized shear stress and the average spheric stress ratio (p/q) becomes flat gradually, and decreases accordingly. (3) With the increasing of water content, the Q3 sandy loess transfers to semisolid state from initial solid state. The cohesions with different ratios of intermediate principal stress all declines remarkably; but the internal friction angle increases a little. Source


Tan D.,Beihang University | Xue Q.,China Institute of Geological Environment Monitoring | Bai P.,Chengdu Hydroelectric Investigation And Design Institute
Proceedings of the 2012 International Conference on Computer Application and System Modeling, ICCASM 2012 | Year: 2012

Traditional 2 dimensional visualization method of geological data is carried out in 3 dimensional by OpenGL. This include process and visualize of large scale data of digital elevation model height data, remote sensing texture data, geological environment information data of point, line and polygon types together with geological body data. The result proves that 2 dimensional visualization methods of geological data can be replaced by 3 dimensional with better intuitive and effective, which is also a developing trend in the future. © The Authors. Source


Yin Y.,China Institute of Geological Environment Monitoring | Wang M.,Sichuan Geological Survey | Li B.,Chinese Academy of Geological Sciences | Feng Z.,Chinese Academy of Geological Sciences
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

The complicate earthquake dynamic response is simulated with FLAC 3D that is much different with simple/homogeneous slope due to poor amplitude effect along the height. For the horizontal acceleration response, the front of the landslide has greater vibrating frequency and amplitude, that is easier to trigger the slide along the inclined layer. For the vertical acceleration response, the back of the landslide has greater amplitude of vibration, and as three times as the absolute value of the acceleration in the front, that is easier cracking, fragmenting or even throwing rock mass. In light of the earthquake dynamic response and movement, the landslide accumulation and source are zoned as follows: (1) the lower inclined bedding sliding accumulation, which distributed in the East and dammed a tributary named the Huangdongzi; (2) the upper avalanche accumulation, which distributed in the Northwest and the North that overlay the North margin of previous sliding accumulation with belt-like; (3) the back cliff and talus, in which lots of cracks in the cliffs shows the tensive failures during the vibration; and lots of talus masses show gravity processes after the earthquake; (4) inclined bedding sliding surface and striation, which distributed at the back of the lower inclined bedding landslide. Enormous large-scale striation belts show the moving direction to North that is as same as the tendency of the layer. Source

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