[雙語翻譯]邊坡穩(wěn)定性外文翻譯--新褐煤露天煤礦設(shè)計邊坡穩(wěn)定性分析（英文）

1、 Procedia Engineering 191 ( 2017 ) 51 – 58 Available online at www.sciencedirect.com1877-7058 © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http

2、://creativecommons.org/licenses/by-nc-nd/4.0/).Peer-review under responsibility of the organizing committee of EUROCK 2017 doi: 10.1016/j.proeng.2017.05.153 ScienceDirectSymposium of the International Society for Rock M

3、echanics Slope Stability Analysis for the Design of a New Lignite Open-Pit Mine Zbigniew Bednarczyk* “Poltegor-Institute“ Institute of Opencast Mining, Wroclaw, Parkowa 25, 51-616 Wroclaw, Poland Abstract The paper pres

4、ents geotechnical engineering studies for the design of a new lignite open-pit mine in central Poland. The lignite deposit occur in a deep tectonic rift formed in Mesozoic rock characterized by complex geological condit

5、ions. The rift is approximately 10 km long, 1 km wide and 50-250 m deep and filled with Neogene and Quaternary sediments. The design of the open-pit mine required geotechnical analysis to reveal possible problems that

6、may occur during its construction and operation. The author of this paper had opportunity to perform slope stability studies and geotechnical analyses within the project conducted by Poltegor-Institute. The calculation

7、 procedure enabled determination of slope stability on the design of excavation and spoil dump. It included 21 analyses using Flac v.7 of which 14 regarded the slopes of the pit, 6 the slopes of the external spoil dump

8、 and one covered both areas. The results indicated that the factor of safety Fs ranges 0.75-1.65 for the pit and 1.12-1.60 for the dump. In risk areas slope inclination were lowered due to likelihood of developing of la

9、ndslide processes. These included spoil dump area close to S-8 road. Due to relatively limited geotechnical data in same areas especially on northern slope and western part of spoil dump detailed geotechnical investiga

10、tions will be necessary. The instability problems can be caused by the groundwater conditions and the presence of high compressibility organic peats in the spoil dump bedrock layers. Comprehensive identification and mo

11、nitoring of geotechnical risks for the mine slopes and storage of overburden should be a continuous process. This activity should start from the beginning stages of construction and should be conducted also during expl

12、oration and continuing to mine final reclamation to reduce potential natural hazard impact on mining and the natural environment. © 2017 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of

13、 the organizing committee of EUROCK 2017. Keywords: lignite opencast mining; slope stability; geotechnical engineering * Corresponding author. Tel.: +48-508-505-398. E-mail address: zbigniew.bednarczy@igo.wroc.pl ©

14、 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the organizing committe

15、e of EUROCK 201753Zbigniew Bednarczyk / Procedia Engineering 191 ( 2017 ) 51 – 58 The geological site investigations in the area of future excavation included 165 boreholes. For the external spoil dump 66 boreh

16、oles and 29 CPTU piezocone soundings were performed [5]. Laboratory tests included index and strength soil tests in direct shear apparatus and triaxial apparatus UU, CD. For the tests 772 soil and rock samples were tak

17、en. On the basis of these investigations 21 separate engineering-geology lithological units were identified [5]. These series were characterized by complex lithology and strength properties. Among the indicated 21 serie

18、s, 7 represent Quaternary, 23 Neogene and 1 Jurassic Period (Tab. 1). Table 1. Zloczew deposit engineering geology lithological units [5]. Engineering geology units Stratygraphy Lithology 1 Organic soils Quaternary P

19、eriod peat, ooze 2 Non-cohesive, river and glacial deposits silty sand, fine sand, middle sand, coarse sand, mixtures sand + gravel, gravel, boulders 3 Near surface loams coarse sand, loam, sandy loam, silty loam,

20、stiff loam, stiff sandy loam 4 Glacial loams loamy sand, loam, sandy loam, silty loam 5 Mud and silt deposits silt, sandy silt 6 Clays clay, sandy clay, silty clay 7 Boulder clay clay with boulders 8 Organic s

21、oils Neogene Period gyttja, lignite, ksylite 9 Sands, Gravels, its mixtures silty sand, fine sand, middle sand, coarse sand, sand + gravel, gravel, boulders 10 Silts over lignite loamy sand, silt 11 Silts with organ

22、ic material loamy sand, silt 12 Silts below the lignite loamy sand, silt 13 Clays above the lignite clay, sandy clay, silty clay 14 Clays with organic material clay, sandy clay, silty clay 15 Clays between ligni

23、te deposit clay, sandy clay, silty clay 16 Clays below lignite deposits clay, sandy clay, silty clay 17 Lignite lignite 18 Clayey-loamy detritus clayey detritus 19 Rocks detritus limestone and marl rocks detritu

24、s 20 Neogene rocks sandstone, mudstone, lake marl 21 Jurassic Soils and Rocks Jurassic Period limestone, marls, clay, silty clay, limestone, rock detritus Geotechnical conditions at the external mine dump could be d

25、efined as a complex. Threats to the stability of the dump volume of approx. 2.3 billion m3 could be posed by the high compressibility peat bedrock that need to be removed and very shallow groundwater level 0.4–1.0 m de

26、ep. 1.2. Methods of numerical analysis The Shear Strength Reduction Method, Flac / Slope v.7.0 codes was used in slope stability analysis for the design of open pit and spoil dump. The method tends to reflect the actual

27、 condition on the slopes leading to the reduction of shear strength of soil till to stage of losing stability. The implemented Mohr-Coulomb strength model required specification of bulk density, effective cohesion and

28、effective angle of internal friction. Application of this method was based on the simultaneous reduction of the angle of internal friction and cohesion in accordance with the formula (1) where: Fs - relative factor of