scholarly journals Mechanical and permeation response characteristics of basalt fibre reinforced tailings to different reinforcement technologies: an experimental study

2021 ◽  
Vol 8 (9) ◽  
pp. 210669
Author(s):  
Jianzhong Liu ◽  
Han Yang ◽  
Dongming Zhang ◽  
Yun Wang ◽  
Weijing Xiao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Permeability Coefficient ◽  
Friction Angle ◽  
Dam Failure ◽  
Tailings Dam ◽  
Compression Index ◽  
Basalt Fibre ◽  
Optimal Length ◽  
Response Characteristics ◽  
Soil Structures

Tailings dam is a man-made hazard with high potential energy; dam failure would cause great losses to human lives and properties. However, the limitations of conventional reinforcement methods like geosynthetic make it easy to slide along the weak structural plane. In this paper, we innovatively added basalt fibre (BF) with different lengths ( l ) and contents ( ω ) into tailings to study its mechanical and permeation characteristics. The results indicate that BF can improve the shear strength ( τ ), cohesion ( c ) and compression index ( C c ) of tailings, but it has little effect on internal friction angle ( φ ). When l is constant, τ , c and C c are positively correlated with ω . One notable phenomenon is that τ and c do not constantly increase with l when ω is constant, but obtain the maximum under the optimal length of 6 mm. Moreover, when ω > 0.6%, permeability coefficient ( k ) is greater than that of the original tailings and the sensitivity of c , φ , τ , C c , k to fibre content is greater than that of length. The research results facilitate the understanding of BF reinforced tailings, and could serve as references for improving the safety of tailings dam and other artificial soil slopes or soil structures.

POLYGON WALL BOUNDARY MODEL IN PARTICLE-BASED METHOD: APPLICATION TO BRUMADINHO TAILINGS DAM FAILURE

2019 ◽  
Author(s):  
Rubens Augusto Amaro Junior ◽  
Lucas Soares Pereira ◽  
Liang-Yee Cheng ◽  
Ahmad Shakibaeinia
Keyword(s):  
Dam Failure ◽  
Tailings Dam ◽  
Wall Boundary ◽  
Boundary Model ◽  
Polygon Wall Boundary Model

scholarly journals The tailings dam failure of 5 November 2015 in SE Brazil and its preceding seismic sequence

2016 ◽  
Vol 43 (10) ◽  
pp. 4929-4936 ◽  
Author(s):  
H. Agurto‐Detzel ◽  
M. Bianchi ◽  
M. Assumpção ◽  
M. Schimmel ◽  
B. Collaço ◽  
...  
Keyword(s):  
Dam Failure ◽  
Tailings Dam ◽  
Seismic Sequence ◽  
Se Brazil

scholarly journals Experimental study on the properties of highperformance concrete made with class C fly ash

2019 ◽  
Vol 276 ◽  
pp. 01014
Author(s):  
I Made Alit Karyawan Salain ◽  
I Nyoman Sutarja ◽  
Teguh Arifmawan Sudhiarta
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
Permeability Coefficient ◽  
Splitting Tensile Strength ◽  
Type I ◽  
Fine Aggregate ◽  
Hydration Time ◽  
Class C

This experimental study presents the properties of highperformance concrete (HPC) made by partially replacing type I Portland cement (OPC) with class C fly ash (CFA). The purpose of this study is to examine, with hydration time, the development of the compressive strength, the splitting tensile strength and the permeability of HPC utilizing different quantity of CFA. Four HPC mixtures, C1, C2, C3, and C4, were made by utilizing respectively 10%, 20%, 30% and 40% of CFA as replacement of OPC, by weight. One control mixture, C0, was made with 0% CFA. The mix proportion of HPC was 1.00 binder: 1.67 fine aggregate: 2.15 coarse aggregate with water to binder ratio 0.32. In each mixture, it was added 5% silica fume and 0.6% superplasticizer of the weight of the binder. Tests of HPC properties were realized at the age of 1, 3, 7, 28, and 90 days. The results indicate that CFA used to partially replace OPC in HPC shows adequate cementitious and pozzolanic properties. The compressive strength and the splitting tensile strength of HPC increase while the permeability coefficient decreases with increasing hydration time. It is found that the optimum replacement of OPC with CFA is 10%, however the replacement up to 20% is still acceptable to produce HPC having practically similar harden properties with control mixture. At this optimum replacement and after 90 days of hydration, the compressive strength, the splitting tensile strength and the permeability coefficient can reach 68.9 MPa, 8.3 MPa and 4.6 E-11 cm/sec respectively. These results are 109%, 101%, and 48% respectively of those of control mixture.

Some lessons from a recent tailings dam failure

2009 ◽  
pp. 343-352
Author(s):  
J.-C. Ballard ◽  
Berghe J.-F. Vanden ◽  
R. A. Jewell ◽  
M. Pirson
Keyword(s):  
Dam Failure ◽  
Tailings Dam
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