Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Deep Excavation by Controlled Rock Blasting Considering Ground Condition and Nearby Structures in UG Metro Station—A Case Study
Bangalore Metro Rail Project Phase II is one of the technologically challenging projects, specially construction of underground metro rail system. The Bengaluru city is very congested and connection of metro rail system with existing transportation networks is equally challenging. In this Phase II of construction, the underground metro is being constructed by blasting hard rock formation and supporting the shear zone. Most of the subsurface rock formations comprises of Granitic Gneiss formations are of Precambrian age and shear zones that includes friable a thin weathered rock formation. With such subsurface geological conditions, the anticipated construction challenges include: (A) deep excavation of hard rock mass under old and sensitive structures and buildings, by controlled blasting; (B) variation in the rock grade from grade I to grade V; (C) weak rock mass at shear zone resulted in planar failure beneath the retaining wall; (D) water seepage along shear planes; (E) selection of a suitable method to conduct blasting near high-voltage electrical machinery or power cables. This paper describes the methods adopted to mitigate these technological challenges and to meet stringent environmental compliances. These include study and application of various geological, geotechnical parameters to develop a proper line drilling and controlled blasting techniques to minimize the ground vibrations and controlling the rock fragmentation and to optimize the equipment performance in terms of productivity and time schedules. The “Phase 2” software of “Rocscience” has been used and regression analysis was carried out by using MCD (Maximum Charge per Delay) and PPV (Peak Particle Velocity) to estimate with FOS (Factor of safety) for sensitive places such as nearby high-rise buildings and electrical transformers.
Deep Excavation by Controlled Rock Blasting Considering Ground Condition and Nearby Structures in UG Metro Station—A Case Study
Bangalore Metro Rail Project Phase II is one of the technologically challenging projects, specially construction of underground metro rail system. The Bengaluru city is very congested and connection of metro rail system with existing transportation networks is equally challenging. In this Phase II of construction, the underground metro is being constructed by blasting hard rock formation and supporting the shear zone. Most of the subsurface rock formations comprises of Granitic Gneiss formations are of Precambrian age and shear zones that includes friable a thin weathered rock formation. With such subsurface geological conditions, the anticipated construction challenges include: (A) deep excavation of hard rock mass under old and sensitive structures and buildings, by controlled blasting; (B) variation in the rock grade from grade I to grade V; (C) weak rock mass at shear zone resulted in planar failure beneath the retaining wall; (D) water seepage along shear planes; (E) selection of a suitable method to conduct blasting near high-voltage electrical machinery or power cables. This paper describes the methods adopted to mitigate these technological challenges and to meet stringent environmental compliances. These include study and application of various geological, geotechnical parameters to develop a proper line drilling and controlled blasting techniques to minimize the ground vibrations and controlling the rock fragmentation and to optimize the equipment performance in terms of productivity and time schedules. The “Phase 2” software of “Rocscience” has been used and regression analysis was carried out by using MCD (Maximum Charge per Delay) and PPV (Peak Particle Velocity) to estimate with FOS (Factor of safety) for sensitive places such as nearby high-rise buildings and electrical transformers.
Deep Excavation by Controlled Rock Blasting Considering Ground Condition and Nearby Structures in UG Metro Station—A Case Study
Lecture Notes in Civil Engineering
Krishna, A. Murali (Herausgeber:in) / Banerjee, Subhadeep (Herausgeber:in) / Pitchumani, N. Kumar (Herausgeber:in) / Ray, P. K. (Autor:in) / Rasagna, Devulapalli L. S. (Autor:in) / Koley, Sudip Kumar (Autor:in) / Reddy, Sainath M. (Autor:in)
DFI-India Annual Conference ; 2022 ; Tirupati, India
31.10.2023
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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