پیوندهای مفید
اخبار و اعلانات
آمار
| تعداد نشریات | 161 |
| تعداد شماره‌ها | 6,532 |
| تعداد مقالات | 70,501 |
| تعداد مشاهده مقاله | 124,095,873 |
| تعداد دریافت فایل اصل مقاله | 97,202,550 |
Influence of water and sand content on adhesion of clayey soils | ||
| Geopersia | ||
| مقاله 6، دوره 5، شماره 1، خرداد 2015، صفحه 55-62 اصل مقاله (389.45 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.7508/GEOP.2015.01.006 | ||
| نویسندگان | ||
| Younes Karami Aznadaryani1؛ Akbar Cheshomi* 1؛ Amir Khabbazi Basmenj2؛ Mohammad Ghafoori2 | ||
| 1Department of Structural and Engineering Geology, School of Geology, College of Science, University of Tehran, Iran | ||
| 2Department of Geology and Engineering Geology, Ferdowsi University of Mashhad, Iran | ||
| چکیده | ||
| Clogging occurs during mechanical tunneling with a Tunnel Boring Machine (TBM) because of adhesion of clayey soils to the cutter head and conveyor system. The present study examined the effects of water and sand contents on clogging in Montmorillonite clayey soil. Testing was carried out using an adhesion test device on 28 samples with different water and sand contents to determine adhesion stress and degree of clogging. The results indicate that the consistency index (Ic) of the samples decreases as the sand and water content increases. The results for variation of adhesion stress versus water content at different sand contents formed similar bellshaped curves. In all graphs, an increase in sand content decreased adhesion stress. Adhesion stress increased until the water content increased to 138%, at which point it began to decrease. The results show that adhesion of the soil to the surface of the metal piston did not occur in samples having a sand content of >40% and in samples with >133% water content having a sand content of <40%, Ic>0.5 adhesion occurred. | ||
| کلیدواژه‌ها | ||
| adhesion؛ Clayey Soil؛ Clogging؛ TBM؛ tunnel boring machine | ||
| مراجع | ||
|
Atkinson, J.H., Fookes, P.G., Miglio, B.F., 2003. Destructuring and disaggregation of Mercia Mudstone during full-face tunneling. Quarterly Journal of Engineering Geology and Hydrogeology, 36: 293-303. Duncan, J.M., 2000. Factors of Safety and Reliability in Geotechnical Engineering. Journal of Geotechnical and Geoenvironmental Engineering; 126(4): 307-316. Fernández-Steeger, T. M., Post, C., Feinendegen, M., Bäppler, K., Zwick, O., Azzam, R., Ziegler, M., Stanjek, H., Peschard, A., Pralle, N., 2008. Interfacial processes between mineral and tool surfaces – causes, problems and solution in mechanical tunnel driving.Geotechnologien Science Report, 12: 46-57. Geodata, S .P .A., 1995. Review of alternative construction methods and feasibility of proposed methods for constructing Attiko Metro Extension of Line 3 to Egaleo: Attiko Metro S. A., 191–193. Gill, D.E., Corthesy, R., Leite, M.H., 2005.Determining the minimal number of specimens for laboratory testing of rock properties.Engineering Geology; 78: 29–51. Kooistra, A., 1998. Verkleving van klei in tunnel boor machines.Memoirs of the Centre of Engineering Geology in the Netherlands, 165, Delft. Sass, I., Barbaum, U., 2009.A method for assessing adhesion of clays to tunneling machines. Bull. Eng. Geol. Environ.68: 27-34 Thewes, M., 1999. Adha¨sion von onbo¨denbeimTunnel vortriebmit Flu¨ ssigkeitsschiden. Berichteaus Grundbau und Bodenmechanik der BergischenUniversita¨tGesamthochschule Wuppertal, Fachbereich Bauingenieurwesen, Band 21, Wuppertal 1999, Shaker Verlag Aachen. Thewes, M., Burger, W., 2004. Clogging risks for TBM drives in clay, Tunnels & Tunnelling International. 28–31. Thewes, M., Burger, W., 2005. Clogging of TBM drives in clay- identification and mitigation of risks, Underground space use: Analysis of the past and lessons for the future, 1-2. | ||
|
آمار تعداد مشاهده مقاله: 1,934 تعداد دریافت فایل اصل مقاله: 1,548 |
||