RELATIONSHIP BETWEENEXCAVATION DEPTH AND DAMAGED ROCK ZONE FOR LOW STRENGTH ROCKS
Hassan, M., Draz, W., Ali, F., Sleem, S. (2021). RELATIONSHIP BETWEENEXCAVATION DEPTH AND DAMAGED ROCK ZONE FOR LOW STRENGTH ROCKS. EKB Journal Management System, 16(61), 1199-1211. doi: 10.21608/auej.2021.207680
M. E Hassan; W. Draz; F. A Ali; S. M Sleem. "RELATIONSHIP BETWEENEXCAVATION DEPTH AND DAMAGED ROCK ZONE FOR LOW STRENGTH ROCKS". EKB Journal Management System, 16, 61, 2021, 1199-1211. doi: 10.21608/auej.2021.207680
Hassan, M., Draz, W., Ali, F., Sleem, S. (2021). 'RELATIONSHIP BETWEENEXCAVATION DEPTH AND DAMAGED ROCK ZONE FOR LOW STRENGTH ROCKS', EKB Journal Management System, 16(61), pp. 1199-1211. doi: 10.21608/auej.2021.207680
Hassan, M., Draz, W., Ali, F., Sleem, S. RELATIONSHIP BETWEENEXCAVATION DEPTH AND DAMAGED ROCK ZONE FOR LOW STRENGTH ROCKS. EKB Journal Management System, 2021; 16(61): 1199-1211. doi: 10.21608/auej.2021.207680

RELATIONSHIP BETWEENEXCAVATION DEPTH AND DAMAGED ROCK ZONE FOR LOW STRENGTH ROCKS

Journal of Al-Azhar University Engineering Sector
Article 16, Volume 16, Issue 61, October 2021, Page 1199-1211  XML PDF (939.58 K)
Document Type: Original Article
DOI: 10.21608/auej.2021.207680
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Authors
M. E Hassan; W. Draz; F. A Ali; S. M Sleem
Mining and Pet. Eng. Dept., Faculty of Engineering, Al -Azhar University, Naser City, Cairo, Egypt
Abstract
The induced stresses around the excavation boundary cause azone where the rock is physically damaged (mechanical properties are permanently affected), this zone is generally known as the Damage Rock Zone.Damaged rock zone (DRZ) has a significant effect on the stability of the excavation. Any problems associated with the DRZ create unsafe working environments and increase construction and supporting costs. In this paper, a simulation study for the Damaged Rock Zone (DRZ) around mine excavations at different depths (100m, 200m and 400m) with disturbance factor (D = 0, 0.5 and 0.8) based on the experimental work with applying two software's (Roclab and Examine 2D). To accomplish this study, cylindrical core specimens of low strength rock (sandstone) was prepared. The core specimens tested using tri-axial compression machine at different confining stress levels from 1 to 12 MPa in order to investigate their mechanical properties. The results introduced to the Roclab software to determine DRZ strength parameters, based on Hoek-Brown failure criterion. Finally applying Examine2D software to determine DRZ thickness. The results proved that, the extent of DRZ affected by depth of the excavation, with increasing the excavation depth, the DRZ extent increase.
 
تسبب الإجهادات المتولدة فى الصخورحول الفتحات المنجمية اضطراب للصخور فى هذه المنطقة والتى تعرف بمنطقة الصخور المتضررة، حيث تتغير خواصها الميکانيکية بصورة دائمة. کما يؤثر سمک منطقة الصخور المتضررة على ثبات الفتحات المنجمية وأى اضطراب بها يخلق بيئة عمل غير آمنة، کما يزيد من تکاليف الإنشاء والتدعيم لهذه الفتحات. ولذا تهدف هذه الدراسة لمحاکاة منطقة الصخور المتضررة  على اعماق مختلفة( 100 و200 و400 متر) مع تغير معامل الإضطراب لها ( 0 و 0.5 و 0.8) وتمت الدراسة على عينات اسطوانية من الحجر الرملى وأجرى عليها إختبار الإجهاد ثلاثى المحاور عند مستوى تحميل من 1 – 12 ميجا باسکال. وتم استخدام برنامجين لتحليل منطقة الإضطراب حول الفتحات المنجمية بتعيين سمکها.أکدت النتائج على تأثير عمق الحفر على سمک منطقة الصخور المتضررة، فبزيادة عمق الحفر يزيد سمک منطقة الصخور المتضررة.
Keywords
Damaged Rock Zone; Excavation Depth; Disturbance factor
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