Experimental study on dynamic response of hard rock blasting …
Several mines are gradually moving towards deep or ultra-deep mining due to the growing demand for mineral resources and the continuing depletion of shallow resources. 1, 2 At present, the most common technique for mining hard rock is still drilling and blasting. 3, 4, 5 Therefore, the deep mine rock mass is in a coupling condition of high static stress and …
Mobile crushing plant improves production
When the time came to change its old static crushing plant, one scottish quarry decided to go mobile and bought an entirely neW system. Patrick Smith reports ... During the busy times blasting took place three times a fortnight and the rock gained varied from 15,000 to 45,000tonnes depending on how the bench was developed.
Coupling Model of Stress–Damage–Seepage and Its Application to Static
Most coal mine field application processes are carried out using empirical formulas because of the insufficient understanding of the fracture development law of the static blasting technology. This lack of understanding results in poor coal seam gas extraction. In this study, a stress–damage coupling model was established to investigate the construction parameters of …
CN113203329A
The invention discloses a stone cubic static crushing method for a mountain deep foundation pit with an ultra-large volume, which relates to the technical field of static crushing and comprises the following steps: performing on-site investigation, determining the structure condition of the mountain to be crushed, establishing a blasting model of the mountain to be crushed through …
Experimental Study on Axial Swelling Mechanical Properties of Static
Abstract: Focused on the axial swelling mechanical behavior of static cracking agent (SCA), an axial-output method was proposed to measure the swelling pressure of SCA and a measurement system and its core steel cylinder component were designed. The swelling pressure of SCA was measured using the axial-output method and the external pipe method respectively, and the …
Software improves crushing potential
Optimisation software has the potential to significantly improve crushing and screening productivity. Claire Symes reports With many capital expenditure plans limited or on hold, quarry operators are increasingly looking for alternative approaches to get the most from their existing fleets.
Rock Fracturing Characteristics and Roadway Expansion …
Static crushing agent (SCA) offers advantages such as good safety, no harmful gases, and minimal vibration, making SCA ideal for rock crushing in mines or underground engineering. To scientifically implement the section expansion of mine roadway, the rock mechanical parameters, SCA expansion properties, and cracking behavior of surrounding rock …
(PDF) Adjustment mechanism of blasting dynamic-static action in …
PDF | Water decoupling charge blasting excels in rock breaking, relying on its uniform pressure transmission and low energy dissipation. ... duration, and a static crushing effect can be achieved ...
Mechanism of Hard Rock Static Blasting-induced …
Figure 1 Diagram illustrating t he static crushing agent hydration reaction's expa nsion mechanism It is important to note that the expansion pressure that forms in the same state of
Mechanistic Study of a Microwave Field-Controlled Static Crushing …
The long reaction time and uncontrollable reaction process of the swelling agent in the process of rock breaking by static crushing agent lead to unsatisfactory efficiency and effect of rock breaking.
Coupling model of stress-damage and its application to static …
Static blasting technology can increase the distribution of the damaged areas of coal seams, realize pressure relief and permeability enhancement of coal seams, and improve the …
Coupling model of stress-damage and its application to static …
Static fracturing technology also known as static blasting technology, uses the swelling pres-sure generated by a mixture of a blasting agent and water to act on the coal to create cracks. This …
Study on rock fracturing in smooth blasting under initial stress
Smooth blasting is widely employed in civil and mining engineering for rock contour excavation [1], [2].In the last decades, owing to the depletion of shallow resources, smooth blasting has been applied to rock perimeter excavation under high geo-stress with the development of deep tunnelling and mining [3], [4], [5].Under this scenario, the evolution of …
Coupling model of stress-damage and its application …
Static fracturing technology also known as static blasting technology, uses the swelling pressure generated by a mixture of a blasting agent and water to act on the coal to create cracks. This technology can effectively …
Mobile and static crushing developments
However, static plant continue to enjoy a special position in the industry, and fixed crushing and screening plants are said to possess an edge for the ability to operate in high output quarries that are typically designed for a useful life of 20 or more years.
Analysis of External Influence Factors and Hydration Reaction of Static
In order to explore the external factors affecting the expansion pressure and temperature changes during the hydration reaction of static crusher, the formula optimization design of static crusher was carried out based on multi−level orthogonal test, the expansion pressure of static crusher was tested by using the "outer tube method", and the hydration …
Investigation of the Acoustic Emission Behavior and Crack …
The direction of static crushing and the cracking effect can be controlled by designing the borehole location and free surface distribution. Keywords. SCA, Acoustic emission, Crack extension, Expansion pressure, Free surface ... Static blasting technology - silent crushing agents and their applications[M]. Beijing: China Building Materials ...
Adjustment mechanism of blasting dynamic-static action in the …
When the blasthole is filled with water, the uniform pressure transmission increases the blasting duration, and a static crushing effect can be achieved by dynamic loading. Ye et …
Quasi-static crushing behavior of novel circular double arrowed …
Quasi-static crushing behavior of novel circular double arrowed auxetic honeycombs: Experimental test and numerical simulation. Author links open overlay panel Feng Jiang a, ... Chen et al. [25] fabricated metallic DAH sandwich structures and revealed their dynamic behavior under tube-guided air blasting. The results showed that compared with ...
Adjustment mechanism of blasting dynamic-static action in the …
Research on the blasting mechanism of water decoupling charge mainly focuses on stress wave action. Li et al. [12] explored the disturbance effect of water decoupling blasting for pre-existing cracks. The results show that the hole wall pressure and the attenuation law in the coupling medium cause the difference in disturbance, and the disturbance effect of water …
Study on Mechanism of Static Blasting-Induced Hard Rock …
research methodologies are used to evaluate the fracturing process of the static crushing agent (SCA). From a mechanical standpoint, the mechanism of fracturing hard rock by a crushing agent is investi-gated. It is assumed that single-hole fracturing is separated into three stages: the microfracture stage,
Experimental Study on the Spatiotemporal Effects of Blasting
Although the blasting dynamic action is attenuated, the quasi-static pressure diffuses from the blast hole to the crushing zone and reaches a maximum at the optimal decoupling coefficient. At this time, the rock-breaking ability of the quasi-static action is the strongest and is superior to the attenuation of the blasting dynamic action.
Coupling Model of Stress–Damage–Seepage and Its Application to Static
fracture hole crushing mechanisms of the static blasting. technology and proposed the u se of the static blasting. technology to address the geological structure of underground. coal mines. Xie. 7.
Alternatives to drilling and blasting
The drill and blast method is used in many quarries to win stone for crushing, but there are alternatives. Patrick Smith reports. European restrictions on blasting operations are now so rigorous that some quarry operators have abandoned the practice in favour of other methods. One of the major reasons for the regulations is that people living or working near, or even in …
Mechanistic Study of a Microwave Field-Controlled Static …
Static crushing agent is a kind of powder material with high expansion characteristics and nonblasting properties prepared by grinding inorganic compounds with …
CN211041969U
The utility model discloses a perfusion equipment of static blasting breaker, including water tank, bottom plate and fixing bolt, water level monitoring pipe is installed at the rear of water tank, the place ahead of outlet is provided with the water valve, the bottom plate is located the below of water tank, the below of water pump is provided with the screw, the top of water pump is fixed ...
(PDF) Study on Mechanism of Static Blasting-Induced …
In this study, mechanical derivation, laboratory experiments, and numerical simulation research methodologies are used to evaluate the fracturing process of the static crushing agent (SCA)....
moves into mobile crushing
became the latest company to move into the mobile crushing market last year with the acquisition of Hartl Anlagenbau. Claire Symes spoke to Bo-Göran Johansson about the new strategy and market prospects. Many quarry operators prefer to use single suppliers wherever possible for construction equipment these days as it can help ease …
Analysis of the Main Factors Affecting Static Blasting Effect
Static blasting uses SCA to slowly load the object to be crushed until it is cracked and broken. SCA used in static blasting, also known as silent cracking agent, static splitting agent, static crushing agent,
Piezoceramic-Based Damage Monitoring of Concrete …
shallow-hole weak blasting in the protective layer, mechanical crushing, and static crushing [6]. Smooth and presplitting blasting offer excellent results, but construction is complicated and ...