Rock damage control for large-diameter-hole lateral blasting excavation based on charge structure optimization

At present, smooth blasting are widely used in urban subway excavation. To improve smooth blasting effect in the blasting excavation process of urban subway, this paper took the fourteen section of Qingdao subway as the background, confirmed the reasonable interval of surrounding holes by combining the theoretical calculation and the actual scene; improved the smooth blasting effect obviously by changing the charge structure of periphery holes. The results of the experiment showed that adopted air-deck divided decoupling charge, when interval of surrounding holes was 350mm, and the minimum burden was 500mm, the smooth blasting effect was better, and the half eye tracking rate was beyond 85%, which meet the design requirements. The experiments proved that when adopted air-deck divided decoupling charge, the blasting effect was better than adopted concentrated charge, so there will be some reference value to the later engineering.

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Blast-induced rock damage control in Fangchenggang nuclear power station, China

Journal of Rock Mechanics and Geotechnical Engineering ◽

10.1016/j.jrmge.2018.04.010 ◽

2018 ◽

Vol 10 (5) ◽

pp. 914-923 ◽

Cited By ~ 10

Author(s):

Yongqing Zeng ◽

Haibo Li ◽

Xiang Xia ◽

Bo Liu ◽

Hong Zuo ◽

...

Keyword(s):

Nuclear Power Station ◽

Nuclear Power ◽

Damage Control ◽

Rock Damage ◽

Power Station

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Discussion on blasting vibration monitoring for rock damage control in rock slope excavation

Earthquake Engineering and Engineering Vibration ◽

10.1007/s11803-021-2071-2 ◽

2021 ◽

Author(s):

Yang Jianhua ◽

Cai Jiyong ◽

Yao Chi ◽

Zhang Xiaobo ◽

Liu Liansheng

Keyword(s):

Rock Slope ◽

Damage Control ◽

Vibration Monitoring ◽

Blasting Vibration ◽

Rock Damage ◽

Slope Excavation

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The Energy-Saving and Noise Reduction of Fan Equipped in Evaporative Condenser in Refrigeration System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.1241 ◽

2012 ◽

Vol 512-515 ◽

pp. 1241-1246

Author(s):

Zhi Yuan Wang ◽

Wei Gang Fu ◽

Yu Xiang Sun ◽

Yong Tao Su

Keyword(s):

Energy Consumption ◽

Noise Reduction ◽

Energy Saving ◽

Formation Mechanism ◽

Large Diameter ◽

Structure Optimization ◽

Variable Frequency ◽

Refrigeration System ◽

Optimum Solution

To study practical methods about energy-saving and noise reduction of fan,by analysising energy consumption and noise formation mechanism of fan in evaporative condenser. on the basis of the fan structure optimization (large diameter fan equiped width blade, anteversion structure),adopting multi-blowers starting and stopping control independently and Variable frequency fan, Optimum solution of energy-saving and noise reduction of fan was obtained.

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Application of Damage Control Tactics and Transpapillary Biliary Decompression for Organ-Preserving Surgical Management of Liver Injury in Combat Patient

Military Medicine ◽

10.1093/milmed/usab139 ◽

2021 ◽

Author(s):

Igor Khomenko ◽

Ievgen Tsema ◽

Kostiantyn Humeniuk ◽

Heorhii Makarov ◽

Dmytro Rahushyn ◽

...

Keyword(s):

Damage Control ◽

Large Diameter ◽

Bile Leak ◽

High Energy ◽

Biliary Fistula ◽

Combat Trauma ◽

Biliary Stents ◽

Biliary Decompression ◽

Stent Occlusion ◽

Four Levels

ABSTRACT The combat penetrating gunshot injury is frequently associated with damage to the liver. Bile leak and external biliary fistula (EBF) are common complications. Biliary decompression is commonly applied for the management of EBF. Also, little is known about the features of combat trauma and its management in ongoing hybrid warfare in East Ukraine. A 23-year-old male was diagnosed with thoracoabdominal penetrating gunshot wound (GSW) by a high-energy multiple metal projectile. Damage control tactics were applied at all four levels of military medical care. Biliary decompression was achieved by endoscopic retrograde cholangiopancreatography (ERCP), endoscopic sphincterotomy (EST) and the placement of biliary stents. Occlusion of the stent was treated by stent replacement, and scheduled ERCP was performed. Partial EBF was diagnosed from the main wound defect of the liver and closed without surgical interventions on the 34th day after the injury. A combination of operative and nonoperative techniques for the management of the combat GSW to the liver is effective along with the application of damage control tactics. A scheduled ERCP application is an effective approach for the management of EBF, and liver resection could be avoided. A successful biliary decompression was achieved by the transpapillary intervention with the installation of stents. Stent occlusion could be diagnosed in the early post-traumatic period, which is effectively managed by scheduled ERCP as well as stent replacement with a large diameter as close as possible to the place of bile leak.

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