Experiment of alternating actions of excavation and unload effects on deformation and instability of high and steep bedding rock slopes with upper steep and lower gentle style

被引：0

作者：

Yang Z. ^{[1
,2
,3
]}

Zhang Z. ^{[1
]}

Hou K. ^{[1
]}

Yang Y. ^{[1
]}

Xiao H. ^{[1
]}

Du J. ^{[1
]}

Cheng Y. ^{[2
]}

Yang B. ^{[2
]}

机构：

[1] Faculty of Land Resources Eng., Kunming Univ. of Sci. and Technol., Kunming

[2] Yunnan Yarong Mining Technol. Co., Ltd., Kunming

[3] Key Lab. of Highway Construction & Maintenance Technol. in Loess Region, Shanxi Transportation Research Inst., Taiyuan

来源：

Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | 2016年 / 48卷 / 06期

关键词：

Alternating actions of excavation and unload; High and steep bedding rock slopes; Similarity model experiment; Upper steep and lower gentle style;

D O I：

10.15961/j.jsuese.2016.06.002

中图分类号：

学科分类号：

摘要：

Alternating actions of excavation and unload have a very important influence on the deformation and instability of high and steep bedding rock slopes with upper steep and lower gentle style, which are widely distributed in China's western regions. Taken the high and steep bedding rock slopes belonging to Jianshan phosphorite mine, Yunnan phosphate group Co., Ltd as an engineering background, model experiment was conducted on the basis of similarity theory, and alternating actions of excavation and unload effects on their deformation and instability were investigated. Research results showed that the deformation displacements of high and steep bedding rock slopes with upper steep and lower gentle style progressively become larger with the gradual increase of the depth of excavation. Its integral deformation laws are that upper slope moves downward, while lower part uplift to the free surface due to compression. At the same time, when the excavation is to a certain depth, many strike cracks can be developed into the slope, then they continuously extend to the slope body in pace with increasing excavation depth. During the whole process of excavation, potentially most dangerous slip surface of composite-style with plane and circular ayc surface is developed gradually into the slope, and deformation and instability characteristics of slip-bending-shear style appear. Although the deformation of the slope is reduced, the trend of deformation and instability of slope is not changed, so the shallow unloading effect is not ideal, while deep unloading effect is very obvious and cracks in the slope are almost completely eliminated. Research achievements play a reference guiding role for early warning and forecast and control design of high and steep bedding rock slopes. © 2016, Editorial Department of Journal of Sichuan University (Engineering Science Edition). All right reserved.

引用

页码：8 / 15

页数：7

共 21 条

[1] Mei S., Study on excavation deformation and failure mechanism of bedding rock, (2008)
[2] Xiao S., Zhou D., Determination and numerical analysis method of relaxation zone of excavation slope, Journal of Southwest Jiaotong University, 38, 3, pp. 318-322, (2003)
[3] Xiao S., Study on the excavation relaxation zone and reinforcing retaining structure of rock high slope, (2003)
[4] Feng X., Chen S., Li W., Research on unloading relaxation criterion of high rocky slope excavation and its engineering application, Rock and Soil Mechanics, 30, pp. 452-456, (2009)
[5] Jiang X., Cao P., Yang H., Simulation of stage excavation for stratified rock slope by using two-dimensional elastoplastic finite element method, Rock and Soil Mechanics, 27, 11, pp. 1935-1940, (2006)
[6] Lin H., Cao P., Li J., Et al., Numerical analysis of failure modes and stability of stratified rock slopes, Rock and Soil Mechanics, 31, 10, pp. 3300-3304, (2010)
[7] Tang P., Li G., Xu W., Influence of water and unloading on rocky slope, Rock and Soil Mechanics, 26, pp. 21-24, (2005)
[8] Yin D., Wang W., Chen S., Dynamic finite element method for excavation process simulation of rock slope, Chinese Journal of Rock Mechanics and Engineering, 30, 11, pp. 2217-2224, (2011)
[9] Liu F., Hu B., Song D., Et al., Analysis of the impact of excavation disturbance on open-pit mining slope stability, Metal Mine, 42, 12, pp. 111-114, (2013)
[10] Cheng L., Research on excavation open-pit slope stability and safe distance of discharge place, (2012)

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