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PAPER OPEN ACCESS A Review of Metro Tunnel

construction section and a bad working environment for workers The shield method can cross stratums with complex engineering and hydrogeological characteristics and has a wide application scope It is suitable for the construction of different structures ranging from the subway tunnel to the underwater tunnel and the buried station because of

Suppressing rockburst by increasing the tensile strength

The formed rock plates continued to deform with increased store strain energy until they buckled at the point of rupture after a further 0 07 s along the trajectory of G H I Simultaneously the broken rock plates and fragments were ejected at high speed with a loud noise and shaking of the test machine due to sudden release of energy

HANDHELD PNEUMATICSConstructionComplete

6 ROCK SPLITTING Rock splitting with hammers and breakers is time and cost saving compared to using explosives Explosives requires secure storing and causes interruptions when blasting and clearing 7 CHIPPING Chipping means you remove cracked and weak concrete before improving for example a road structure with new concrete 8 UNDERWATER WORK

Types and Causes of Concrete Deterioration

The exceptional durability of portland cement concrete is a major reason why it is the world s most widely used construction material But material limitations design and construction practices and severe exposure conditions can cause concrete to deteriorate which may result in aesthetic functional or structural problems

A Mechanical Model of the Overlying Rock Masses in

The water inrush of a working face is the main hidden danger to the safe mining of underwater coal seams It is known that the development of water flowing fractured zones in overlying strata is the basic path which causes water inrushes in working faces In the engineering background of the underwater mining in the Longkou Mining Area the analysis model and judgment method of crack

How to break concrete or crack split rocks easily Dexpan

Concrete Demolition and Rock Breaking Cracking Splitting has never been easier with Dexpan Non Explosive Demolition Agent Dexpan is a cement with amazing 18 000 PSI expanding strength when mixed with water Poured into drilled holes Dexpan breaks concrete and cracks splits rocks safely and quietly while providing SILENT cracking

Underground Construction TechniquesCivil Engineering

Underground Construction Techniques By Laxmanagouda GEC HUVINA HADAGALI CHAPTER 1 INTRODUCTION 1 1 GENERAL The various underground construction methods discussed as options for the example facility must be evaluated on a site specific basis since factors such as site geology will vary significantly in different locales

Typical Underwater Tunnels in the Mainland of China and

Technologies for underwater tunnels in China With the development of China s economy and urbanization the rate of construction of underwater tunnels is increasing According to statistics more than 100 underwater tunnels have been built in China and more than 20 underwater tunnels are currently under construction in China

Yun DONG Huaiyin Institute of Technology Department

A read is counted each time someone views a publication summary such as the title abstract and list of authors clicks on a figure or views or downloads the full text

China Rock and Concrete Breaking Chemicals/Cracking

Demolition Agent Expansive Cracking Mortar Soundless Cracking Agent manufacturer supplier in China offering Rock and Concrete Breaking Chemicals/Cracking Chemicals 2021 Bestlink Trenching Tunnelling and Wall Demolition Hydraulic Splitter for Concrete and Stone Rocks 2021 Underground and Open Mining Hydraulic Rock Splitter for Granite Marble Sandstone and so on

USAMethod and device for cutting underwater

A method of cutting underwater structures which comprises the following steps a local underwater step including the anchorage of cutting means in the cutting area exactly positioned to effect the desired cut to the structure to be cut a remotely controlled step including the automatic activation and de activation from a spot at the surface of the cutting means and the automatic feed

Reliable hydraulic rock splitting tools for Tough Jobs

Buy hydraulic rock splitting tools for use in digging deep into rocky areas and breaking them away Companies can use them to prepare a quarry or mine shaft or make a flat stable area for a home or other structure Most hydraulic rock splitting tools feature simple controls and are easy to use without a lot of training Many models can drill

PROCEDURES FOR BLASTING

BackbreakRock broken beyond the limits of the last row of holes in a blast synonymous with overbreak Base ChargeThe main explosive charge in the base of a detonator or a heavy charge at the base of a column of presplit powder Battered Production HolesThe row of production holes closest to presplit line drilled at the

Causes and Effects of the Rapid Sinking of the Titanic

At the time of her construction the Titanic was the largest ship ever built She was nearly 900 feet long stood 25 stories high and weighed an incredible 46 000 tons Division 1997 With turn of the century design and technology including sixteen major watertight compartments in her lower section that could easily be sealed off in the

PDF Rock breaking methods to replace blasting

Hydraulic splitting is a widely used method that has many advantages such as ease of work safe operation and environmental protection 50 This

Experimental and three dimensional mesoscopic

An investigation that combines both experimental tests and mesoscopic modelling is conducted to characterize the dynamic splitting tensile behavior of coral aggregate concrete CAC Static and dynamic splitting tensile strength and failure patterns of CAC with different uniaxial compressive strength 30–70 MPa are tested by means of MTS machine and Split Hopkinson pressure bar device

The distribution of stress in the neighbourhood of a crack

Gao Q and Ghassemi A 2017 Pore Pressure and Stress Distributions Around a Hydraulic Fracture in Heterogeneous Rock Rock Mechanics and Rock Engineering 10 1007/s 50 12 Online publication date 1 Dec 2017

Providing ECOBUST The Fastest Most Powerful Most

ECOBUST is the premier source for the most economical non explosive demolition agents on the market Ecobust provides a safe noise free effective environmentally friendly solution for rock and concrete breaking Ecobust is developed for small or large projects does not require special training or permits Applications include and not limited to concrete and rock demolition rock

Face stability analysis of shallow underwater tunnels in

When an underwater tunnel constructed via the mining method crosses a fault fracture zone one of the most important issues to consider is ensuring the stability of its face Several auxiliary techniques have been adopted in construction however the design parameters of these auxiliary measures are mainly determined by experience In this study a stability analysis model of the working

Hydraulic Hammer Drilling Technology Developments and

Percussion drilling technology was considered many years ago as one of the best approaches for hard rock drilling Unfortunately the efficiency of most hydraulic hammer HH designs was very low

Face stability analysis of shallow underwater tunnels in

When an underwater tunnel constructed via the mining method crosses a fault fracture zone one of the most important issues to consider is ensuring the stability of its face Several auxiliary techniques have been adopted in construction however the design parameters of these auxiliary measures are mainly determined by experience In this study a stability analysis model of the working face

China YM S P Dredgeself propelled

The super giant trailing suction hopper dredger belongs to a high tech difficult and high value added ship The cost of a 30 000 ton super giant trailing suction hopper dredger was 220 million

CONSTRUCTION OF IMPACT STABILITY TEST MODEL IN

Zhang F Ti Z and Zhang A 2018 Simulation of impact stability test model in underwater coal mining of dam In Liu Z L and Mi C eds Advances in Sustainable Port and Ocean Engineering Journal of Coastal Research Special Issue No 83 pp 642–645 Coconut Creek Florida ISSN Rock burst is one of the coal and rock dynamic phenomena occurred in mining The

PDF Rock breaking methods to replace blasting

Hydraulic splitting is a widely used method that has many advantages such as ease of work safe operation and environmental protection 50 This

Hydraulic Hammer Drilling Technology Developments and

Percussion drilling technology was considered many years ago as one of the best approaches for hard rock drilling Unfortunately the efficiency of most hydraulic hammer HH designs was very low

Chuangbing ZHOU Professor Full Professor Nanchang

1 THM Coupling analysis for rocks in hydroelectrical engineering 2 fractue flow and seepage control in civil engineering 3 rock slop stability analysis and life cycle safety control 4

PDF Rock breaking methods to replace blasting

Hydraulic splitting is a widely used method that has many advantages such as ease of work safe operation and environmental protection 50 This technique was designed and introduced based on

The ConstructorThe Construction Encyclopedia

The Constructor is a construction encyclopedia providing informational resources to Civil Engineers on subjects such as concrete construction Structures Building Tips How to Guides

Experimental investigation into the effects of composition

To avoid the irregularity of tensile stress indirect tensile method or Brazilian disc split test is often used locally and abroad for rock materials 13 14 15 16 17 18

Common Pile Driving Problems and Solutions

Pile driving is often a cost effective and time efficient method of driving support posts piles into the earth But because you re working with soil and other hidden features in the earth there is an element of the unknown and things don t always go as planned Whether you are driving concrete steel or wood piles any number of problems are common

A Mechanical Model of the Overlying Rock Masses in

The water inrush of a working face is the main hidden danger to the safe mining of underwater coal seams It is known that the development of water flowing fractured zones in overlying strata is the basic path which causes water inrushes in working faces In the engineering background of the underwater mining in the Longkou Mining Area the analysis model and judgment method of crack

IOP Conference Series Materials Science and Engineering

transverse thrust broken rock Hydraulic splitting machine rock breaking process According to the rock hardness free surface rock breaking degree and the requirements of the direction of rock breaking and other conditions drilling with a drilling machine wedge pressure into the rock pressurized broken rock The hydraulic

MAGNUM BUSTER TECHNOLOGYRocBurst LLC

Magnum Buster Technology The Magnum Buster is a compact cost effective and portable piece of equipment which is extremely useful in the splitting and breaking of rocks and boulders as well as the demolition of concrete structures

Types and Causes of Concrete Deterioration

The exceptional durability of portland cement concrete is a major reason why it is the world s most widely used construction material But material limitations design and construction practices and severe exposure conditions can cause concrete to deteriorate which may result in aesthetic functional or structural problems

HANDHELD PNEUMATICSConstructionComplete

6 ROCK SPLITTING Rock splitting with hammers and breakers is time and cost saving compared to using explosives Explosives requires secure storing and causes interruptions when blasting and clearing 7 CHIPPING Chipping means you remove cracked and weak concrete before improving for example a road structure with new concrete 8 UNDERWATER WORK

PROCEDURES FOR BLASTING

BackbreakRock broken beyond the limits of the last row of holes in a blast synonymous with overbreak Base ChargeThe main explosive charge in the base of a detonator or a heavy charge at the base of a column of presplit powder Battered Production HolesThe row of