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2 · What is excavation work Excavation work is defined as the removal of earth rock or other material in connection with construction or demolition works using tools machinery or explosives to form an open face hole or cavity Excavation work includes any earthwork trenching cofferdam caisson well shaft tunnel or underground working
·Control measures involve supporting excavation sides with timber sheeting or proprietary systems providing guard rails and toe boards locating underground services ensuring safe access and egress and inspecting excavations regularly A competent person must supervise excavation work and inspect excavations to ensure safety Read less
These hazards should be identified and preventive measures should be taken to avoid any accident at construction sites Excavation Hazards Affects and Prevention Measures 1 Pit Excavation up to 3m Pits up to three meters may be excavated for testing subsurface soil monitoring water table foundation construction etc
·[1] Jiang N and Zhou C B 2012 Blasting vibration safety criterion for a tunnel liner structure Tunn Undergr Sp Tech 32 52 7 Crossref; Google Scholar [2] Yu H T Yuan Y Yu G X et al 2014 Evaluation of influence of vibrations generated by blasting construction on an existing tunnel in soft soils Tunn Undergr Sp Tech 43 59 66 Crossref; Google Scholar [3]
·This technology guarantees that the excavation of mountain body will not affect the normal opening of frontal expressway and county road and will not affect the safety of production of the company
·The TC 4850 blasting vibration recorder produced by Chengdu Zhongke Measurement & Control Co Ltd is used in this test It can provide the experimental data and theoretical support for the blasting excavation of the high level radioactive waste geological disposal and it also has a certain guiding significance for the blasting excavation
·From a safety perspective it is important to know how sensitive an explosive is to impact friction and heat Blast fragmentation size will influence equipment selection and visa versa if equipment already exists Excavation schedules and drill bench dimensions will influence blast hole size explosive selection and labor requirements
·Monitoring measurement Monitoring measurement is a powerful tool to ensure the safety of tunnel construction It involves observing and recording the surface condition of the shotcrete layer
·Tunnel excavation blasting operations often result in important negative impacts The negative effects of blasting induced blast earthquakes in particular the hazards caused by blast earthquakes to surrounding buildings and facilities are receiving increasing attention and emphasis [1] Reducing the vibration hazards caused by blasting has been a research hot spot
This quiz covers various excavation techniques used in mining including open pit mining strip mining mountaintop removal and dredging Additionally it addresses the essential safety regulations and personal protective equipment PPE necessary for ensuring worker safety in these operations Test your knowledge on these critical mining practices and safety measures
DOI / Corpus ID 267112159; Blasting vibration effect and safety evaluation method of railway cross tunnels article{Zhao2024BlastingVE title={Blasting vibration effect and safety evaluation method of railway cross tunnels} author={Yan Zhao and Ren liang Shan and Hailong Wang} journal={Tunnelling and Underground Space Technology}
·Drill and blast is a commonly used method for rock slope excavation in hydropower engineering During blasting excavation of rock slopes far field vibration monitoring on the first upper berm for statutory compliance is usually performed to control the blast induced rock damage to the final slope face In this study for the rock slope excavation in the Jinping I
·Blasting damage control is one of the main problems in the dam foundation excavation of Baihetan Hydropower Station and it is important to study the relationship between the blasting vibration and blasting damage In this paper a horizontal presplit blasting experiment was carried out at the dam foundation By combining vibration monitoring and sonic wave
·Yang et al 2016 discussed the effect of the delay time on the vibration frequency for full face millisecond delay blasting in underground opening excavation Through strain measurement Dowding et al 2018 studied the transmission mode of vibration waves inside large structures
·By reviewing the development history and the state of art this paper introduces Chinese safety regulations for blasting vibration for adjacent structures and equipments as well as for structures themselves under blasting operation such as high rock slopes underground caverns foundation rock masses and fresh concrete The mechanism of failures or damages
·3 Design and Verification of Blasting Parameters Design of Tunnel Blasting Parameters According to relevant rules in Safety Regulations for Blasting GB6722 2014 the critical value of safe particle vibration velocity is 10 20 cm/s [20 22] Considering the structural uniqueness of the transition section in a branching out tunnel the safety critical value of
Pre splitting blasting technology is used for mining near slopes and No 2 rock emulsion explosive is used for blasting operations The density of this explosive is g/cm detonation velocity is greater than or equal to 3200 m/s the specific charge is kg/m blasthole diameter is 90 mm the hole depth is 10 m and the subdrilling is 1 m with a
·Occupational health and safety measures in excavation works are of vital importance to protect the health and safety of workers to minimize occupational accidents and to provide a safe
·Building a new tunnel adjacent to an existing tunnel has become a common means of transformation in engineering Existing tunnels are prone to some deterioration such as cavities and cracks under long term traffic load This kind of deterioration tunnel is prone to collapsing under the action of blasting Therefore the vibration caused by blasting should be
The strictness of the result of an excavation whether mechanical or by means of explosives is naturally conditioned by its objective and therefore by the type of technique applied to achieve it To attain the best results in terms of rock breakage and with respect to the final profile it is important to evaluate the specific excavation energy and its optimization This study being a
Tunneling work is widely carried out in the construction of the railway road projects and irrigation This work is specialized and hazardous because of cramped working space wet and slippery flooring artificial lighting Usually characterized by inadequate ventilation obnoxious gases unseen weaknesses of rock handling of explosives hauling muck etc leading to accidents in
·Shoring to prevent the collapse of the sides of an excavation consisting of timber or steel frames with close boarding between frames Barriers along the sides of an excavation to prevent workers falling into it PROTECTION OF ADJOINING BUILDINGS 1 An excavation should not be so close and deep as to undermine stability of any adjacent structure 2
·5 Necessary Precautions for Keeping Sandblasting Safe Updated December 22 2023 Sandblasting or abrasive blasting is the process of directing tiny abrasive particles with compressed air or water to create a high velocity stream that smooths surfaces removes jagged edges or burrs applies texture to a material or prepares a surface for coating
·The sand mud interbedded surrounding rock contains discontinuities such as horizontal bedding joints weak planes and weak interlayers Drilling and blasting construction in this kind of
