Sains Malaysiana 48(2)(2019): 317–324

http://dx.doi.org/10.17576/jsm-2019-4802-07

Effects of Tectonic Stresses and Structural Planes on Slope Deformation and Stability at the Buzhaoba Open Pit Mine, China

(Kesan Tekanan Tektonik dan Satah Struktur pada Canggaan Cerun dan Kestabilan di Lombong Terbuka, Buzhaoba, China)

SHUZHAO CHEN^1,2, GOH THIAN LAI^3*, LIU HAN^1,2 & GERSON. S. V. TOVELE¹

¹School of Mines, China University of Mining and Technology, Xuzhou 221116, China

²State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China

³School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Received: 4 May 2018/Accepted: 25 October 2018

ABSTRACT

Tectonic stresses and structural planes are key factors that affect slope stability. The studies of the effect mechanism of the two factors on the slope deformation and instability have an important value for realizing an accurate evaluation of slope stability. The deformation and landslide problems of the west slope at the Buzhaoba open pit mine were analyzed. Tectonic stresses and structural planes were confirmed as the main factors of long-term deformation of the slope. According to an analysis of the regional structure, the principal stress direction of the Buzhaoba mine was 123° and the slope sliding mode and discriminant conditions were determined under the influence of tectonic stress. The principal stress direction was verified by comparison with the results of displacement monitoring and stability analysis of the slope. The factor of safety of the slope is 1.29 when considering tectonic stress and reduces by 7.19% when tectonic stress is not considered.

Keywords: Fault; open pit mine; slope stability; structural plane; tectonic stresses

ABSTRAK

Tegasan tektonik dan satah struktur adalah faktor utama yang mempengaruhi kestabilan cerun. Kajian mekanisme kesan dua faktor pada kecerunan dan ketidakstabilan cerun mempunyai nilai penting dalam mewujudkan penilaian kestabilan cerun yang tepat. Masalah kecanggaan dan tanah runtuh di cerun barat di lombong terbuka Buzhaoba telah dikaji. Tegasan tektonik dan satah struktur telah disahkan sebagai faktor utama dalam perubahan kecanggaan jangka panjang cerun. Mengikut analisis struktur serantau, arahan tegasan utama lombong Buzhaoba adalah 123° dan mod gelongsor cerun dan syarat diskriminasi ditentukan di bawah pengaruh tegasan tektonik. Arah tegasan utama disahkan berdasarkan perbandingan dengan hasil pemantauan anjakan dan analisis kestabilan cerun. Faktor keselamatan cerun adalah 1.29 apabila mengambil kira tegasan tektonik dan menurun sebanyak 7.19% apabila tegasan tektonik tidak diambil kira.

Kata kunci: Kestabilan cerun; lombong pit terbuka; satah struktur; sesar; tegasan tektonik

REFERENCES

Cai, M., Kaiser, P.K., Tasaka, Y. & Minami, M. 2007. Determination of residual strength parameters of jointed rock masses using the GSI system. International Journal of Rock Mechanics and Mining Sciences 44(2): 247-265.

Cai, Q.X., Zhou, W., Shu, J.S., Liu, Y. & Peng, H.G. 2008. Analysis and application on end-slope timeliness of internal dumping under flat dipping ore body in large surface coal mine. Journal of China University of Mining & Technology 37(6): 740-744.

Can, E., Mekik, Ç., Kuşcu, Ş. & Akç?n, H. 2013. Monitoring deformations on engineering structures in Kozlu Hard Coal Basin. Natural Hazards 65(3): 2311-2330.

Chang, D.S., Zhang, L.M., Xu, Y. & Huang, R.Q. 2011. Field testing of erodibility of two landslide dams triggered by the 12 May Wenchuan earthquake. Landslides 8(3): 321-332.

Chen, H.X., Zhang, L.M., Chang, D.S. & Zhang, S. 2012. Mechanisms and runout characteristics of the rainfall-triggered debris flow in Xiaojiagou in Sichuan Province, China. Natural Hazards 62(3): 1037-1057.

Chen, Y., Wu, P., Yu, Q. & Xu, G. 2017. Effects of freezing and thawing cycle on mechanical properties and stability of soft rock slope. Advances in Materials Science and Engineering 2017: 1-10.

Dhahri, F., Benassi, R., Mhamdi, A., Zeyeni, K. & Boukadi, N. 2016. Structural and geomorphological controls of the present-day landslide in the Moulares phosphate mines (Western-Central Tunisia). Bulletin of Engineering Geology and the Environment 75(4): 1459-1468.

Fell, R., Macgregor, P., Stapleton, D. & Bell, G. 2005. Geotechnical Engineering of Dams. London: Taylor & Francis.

Hack, R., Alkema, D., Kruse, G.A.M., Leenders, N. & Luzi, L. 2007. Influence of earthquakes on the stability of slopes. Engineering Geology 91(1): 4-15.

Han, L., Shu, J.S., Hanif, N.R., Xi, W.J., Li, X., Jing, H.W. & Ma, L. 2015. Influence law of multipoint vibration load on slope stability in Xiaolongtan open pit mine in Yunnan, China. Journal of Central South University 22(12): 4819-4827.

Han, L., Zhou, W., Shu, J.S., Wang, S.W. & Meng, Q.W. 2014. Study of plane sliding timeliness stability and structure optimization of soft rock slope. Journal of China University of Mining and Technology 43(3): 395-401.

Martel, S.J. 2016. Effects of small-amplitude periodic topography on combined stresses due to gravity and tectonics. International Journal of Rock Mechanics and Mining Sciences 89: 1-13.

Mohamad, A.D.M., Ramli, M.F., Wan, N. & Surip, N. 2010. Application of remote sensing in the identification of the geological terrain features in Cameron Highlands, Malaysia. Sains Malaysiana 39(1): 1-11.

Nian, T.K., Huang, R.Q., Wan, S.S. & Chen, G.Q. 2012. Three-dimensional strength-reduction finite element analysis of slopes: Geometric effects. Canadian Geotechnical Journal 49(5): 574-588.

Pradhan, B. 2013. A comparative study on the predictive ability of the decision tree, support vector machine and neuro-fuzzy models in landslide susceptibility mapping using GIS. Computers & Geosciences 51(2): 350-365.

Rohmer, J. 2014. Dynamic sensitivity analysis of long-running landslide models through basis set expansion and meta-modelling. Natural Hazards 73(1): 5-22.

Safavian, M. & Rezaei, M. 2014. Evaluation of landslide analyzing models in weak rocks-case study: Abnahr damsite, Kohgilouyeh and Booyer Ahamd Province, Iran. Bulletin of Engineering Geology and the Environment 73(1): 87-94.

Shen, Y., Xu, G., Song, S., Li, Z., Feng, X. & Dong, J. 2014. A classification method of surrounding rock mass in hydropower project in high geostress area. Chinese Journal of Rock Mechanics and Engineering 33(11): 2267-2275.

Shu, J.S., Tang, Z. & Cai, Q.X. 2012. Research on stability of bedding rock slopes under hydraulic pressure. Zhongguo Kuangye Daxue Xuebao (Journal of China University of Mining & Technology) 41(4): 521-525.

Slim, M., Perron, J.T., Martel, S.J. & Singha, K. 2015. Topographic stress and rock fracture: A two-dimensional numerical model for arbitrary topography and preliminary comparison with borehole observations. Earth Surface Processes and Landforms 40(4): 512-529.

Taha, M.R., Khajehzadeh, M. & El-Shafie, A. 2012. Application of particle swarm optimization in evaluating the reliability of soil slope stability analysis. Sains Malaysiana 41(7): 847-854.

Tan, W., Kulatilake, P.H.S.W. & Sun, H. 2014. Influence of an inclined rock stratum on in-situ stress state in an open-pit mine. Geotechnical and Geological Engineering 32(1): 31-42.

Tibaldi, A., Corazzato, C., Rust, D., Bonali, F.L., Mariotto, F.A.P., Korzhenkov, A.M., Oppizzi, P. & Bonzanigo, L. 2015. Tectonic and gravity-induced deformation along the active Talas-Fergana Fault, Tien Shan, Kyrgyzstan. Tectonophysics 657: 38-62.

Wang, G., Wang, H., Gan, H., Liu, E., Xia, C., Zhao, Y., Chen, S. & Zhang, C. 2016. Paleogene tectonic evolution controls on sequence stratigraphic patterns in the Fushan sag, Northern South China Sea. Journal of Earth Science 27(4): 654-669.

Wang, T.T. & Huang, T.H. 2009. A constitutive model for the deformation of a rock mass containing sets of ubiquitous joints. International Journal of Rock Mechanics and Mining Sciences 46(3): 521-530.

Wyllie, D.C., Mah, C.W., Hoek, E. & Bray, J.J. 2004. Rock Slope Engineering. London: Civil and Mining, Spon Press.

Xia, K.Z., Chen, C.X., Fu, H., Pan, Y.C. & Deng, Y.Y. 2016. Mining-induced ground deformation in tectonic stress metal mines: A case study. Bulletin of Engineering Geology and the Environment 75(3): 1-27.

Yang, J., Tao, Z., Li, B., Gui, Y. & Li, H. 2012. Stability assessment and feature analysis of slope in Nanfen Open Pit Iron Mine. International Journal of Mining Science and Technology 22(3): 329-333.

Yoon, W.S., Jeong, U.J. & Kim, J.H. 2002. Kinematic analysis for sliding failure of multi-faced rock slopes. Engineering Geology 67(1-2): 51-61.

Zhao, Y., Cui, P., Hu, L. & Hueckel, T. 2011. Multi-scale chemo-mechanical analysis of the slip surface of landslides in the Three Gorges, China. Science China Technological Sciences 54(7): 1757-1765.

Zhou, W., Han, L., Shu, J. & Meng, Q. 2016. Research on stability control mechanism of concave slope with circular sliding mode. Journal of China University of Mining and Technology 45(1): 70-76.

Zuza, A.V., Yin, A., Lin, J. & Sun, M. 2017. Spacing and strength of active continental strike-slip faults. Earth and Planetary Science Letters 457: 49-62.

*Corresponding author; email: gohthianlai@ukm.edu.my