The drilling and blasting method realizes rock fragmentation through mechanical drilling and explosive blasting and has consistently been an important construction method in related fields, such as geotechnical engineering [1,2,3] …
→ WhatsApp: +86 18221755073
In this paper, with the help of particle expansion blasting simulation method, sandstone is used as the research object to analyze the blasting damage characteristics of …
→ WhatsApp: +86 18221755073
The blasting damage to a rock mass results from the activation, expansion, and accumulation of micropores in the rock under the combined action of the blasting stress wave and detonation gas, which leads to the deterioration of the rocks' mechanical properties and reduced bearing capacity until rock failure; in other words, the damage degree ...
→ WhatsApp: +86 18221755073
The ventilation shaft of the Maluanshan tunnel, has a design depth of 193 m and a diameter of 16.7 m. The Maluanshan tunnel is located in the southwest section of the Lianhuashan fault zone, ... During blasting in rock masses, the damage and destruction of rock mass is closely related to the dynamic response inside the rock mass. Dividing the ...
→ WhatsApp: +86 18221755073
By far the most common technique of rock excavation is that of drilling and blasting. From the earliest days of blasting with black powder, there have been steady developments in …
→ WhatsApp: +86 18221755073
Rock blasting is a key technique for fragmenting and modifying the properties of subsurface rock. 1 Blasting involves complex phenomena including high stress gradients, fracture mechanics, wave propagation, and fragmentation. [2], [3], [4] The creation of fragmented and fractured rock is one of the stages of mineral extraction, usually created through bench …
→ WhatsApp: +86 18221755073
The research found that rock damage near the blasting area was caused by high-frequency vibration, while rock damage far away from the blasting hole was caused by low-frequency vibration. ... According to Fig. 16, the blasting of the latter structure will have a considerable impact on the damage depth of surrounding rock within 15 cm of the ...
→ WhatsApp: +86 18221755073
In rock blasting, it is generally agreed that two types of loadings, stress wave and explosion gas pressure, operate on the surrounding rock during an explosion [17], [18], [19], [20].A stress wave loading travels outward from the detonation of explosive column in a borehole, and it is immediately followed by a longer duration gas pressure loading [21], [22].
→ WhatsApp: +86 18221755073
The borehole-blasting method is the most prevalent in rock mass excavation. This method is economical and flexible [1, 2].The application of the borehole-blasting method in underground engineering has yielded significant economic and social benefits, especially in the mining of underground energy and tunnel construction [3, 4].Blasting can cause the …
→ WhatsApp: +86 18221755073
Abstract. Blasting-induced damage zones in rock masses are commonly identified by changes in the ratio of the P-wave velocities before and after blast. In ultrasonic tests, water is usually adopted as the coupling medium. As the ultrasonic wave propagates in the aqueous medium, the measured P-wave velocity will be affected by the water coupling distance …
→ WhatsApp: +86 18221755073
The detonation pressure of different charge structures varies with time, as shown in Fig. 3.It can be seen from the figure that, compared with the coupling charging, the blasting shock wave of the decoupling charge has a lower peak value and a slower attenuation, which can effectively reduce the damage to the rock (Balakrishnan et al. 2020; Ding et al. 2021).
→ WhatsApp: +86 18221755073
1. Introduction. Drilling and blasting is a controlled method of rock mass breakage using explosives that is commonly utilized in the mining and quarry industries, and in civil engineering constructions such as tunnels and dams (Verma and Prasad 2014, Hu et al 2017).Although rock blasting is a more efficient technique for rock breakage, it still has several …
→ WhatsApp: +86 18221755073
Considerable efforts have been made to study the blasting damage or vibration in the rock mass and to minimize the harmful effect resulting from blasting for the last many years (Wu 2003; ... Figure 16 plots the curve of damage depth extension and PPV during blasting excavation. The location of PPV is at the bench just above the blasting zone.
→ WhatsApp: +86 18221755073
Wang et al. [16] compared the performance differences between the RHT model and the HJC model by simulating granite blasting cracks, and found that the HJC model failed to accurately characterize the tensile damage of rock subjected to dynamic loads.
→ WhatsApp: +86 18221755073
However, most research has focused on predicting surrounding rock damage from a single blasting method, with few studies comparing the effects of different blasting methods on surrounding rock damage. ... By comparing the values at all locations, it is determined that the PPV cr for grades III, IV, and V surrounding rock is 16.8 cm/s, 13.7 cm/s ...
→ WhatsApp: +86 18221755073
Blasting damage in rock Introduction The most common technique for rock excavation is that of drilling and blasting. From the earliest days of blasting, there have been steady developments in explosives, detonating ... 16 sticks/hole 33 Half-sec Perimeter 26 45 Gurit, 7 sticks/hole and 26 Half-sec Gelamex 80, 1 stick/hole
→ WhatsApp: +86 18221755073
The results of numerical simulation using the proposed damage model shows that the blasting damage range of rock with a damage degree of more than 0.5 very significantly reduces from 1.0 m to 0.3 m as the spacing …
→ WhatsApp: +86 18221755073
Therefore, the reduction of unwanted damage is a major objective of rock blasting operations. To reduce unwanted damage, the ability to predict damage caused by rock blasting is essential. If a shock wave based technique can be developed and verified by comparison to laboratory or field results, it would provide a new approach to protect the
→ WhatsApp: +86 18221755073
1. 16 Blasting damage in rock 16.1 Introduction The development of rock mechanics as a practical engineering tool in both underground and surface mining has followed a rather erratic path over the past few decades. Only the most naively optimistic amongst us would claim that the end of the road has been reached and that the subject has matured into a fully …
→ WhatsApp: +86 18221755073
Rock damage due to blasting is a very important topic when it comes to ground control in surface mines, construction works, underground mines, and tunnels. Blast induced …
→ WhatsApp: +86 18221755073
Various damage models have also been suggested to study the damage characteristics of rock mass under blasting. For instance, Grady [15], Grady and Kipp [16], [17], and Kipp and Grady [18] presented a damage model to describe the degradation of rock stiffness and strength caused by tensile cracks growth under blasting. Based on the model, the …
→ WhatsApp: +86 18221755073
Duvall and Fogelson (1962), Langefors and Khilstrom (1973) and others, have published blast damage criteria for buildings and other surface structures. Almost all of these criteria relate …
→ WhatsApp: +86 18221755073
In this paper, the method of model experiment and numerical simulation is used to preliminarily explore the fracture damage characteristics of slit charge blasting in the layered rock mass. The ...
→ WhatsApp: +86 18221755073
The essence of research on rock mass blasting damage lies in accurately identifying and evaluating rock damage. Numerous initial damage defects, such as micro-cracks and …
→ WhatsApp: +86 18221755073
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 …
→ WhatsApp: +86 18221755073
During blasting, rock failure is caused by blasting wave and explosive gas pressure, as a multi-field coupled process. Most numerical models focus on the effect of blasting wave where the gas pressure is commonly …
→ WhatsApp: +86 18221755073
In order to quantitatively describe the damage degree of blasting rock mass, the relationship between fractal dimension and rock mass damage degree is further established, as shown in Eq. ... 16. Hamdi E, Romdhane NB, Le Cléac'h JM. A tensile damage model for rocks: Application to blast induced damage assessment. Comput. Geotech. 2011; 38:133 ...
→ WhatsApp: +86 18221755073
Abstract This study explores how the inclination and positioning of structural planes influence tunnel rockbursts under dynamic disturbances. Recent research has emphasized the critical role of structural planes within rock masses during tunnel rockbursts. This study utilizes PFC software to simulate rockbursts triggered by blasting stress waves and analyzes the …
→ WhatsApp: +86 18221755073
As a cost-effective method of rock excavation, drilling and blasting has been widely utilized in geotechnical engineering. 1, 2, 3 In engineering blasting, cylindrical explosive cartridges are frequently employed, creating a gap between the explosive cartridge and the borehole wall. The medium that fills the gap is called the coupling medium, and air is the most common …
→ WhatsApp: +86 18221755073
Stone Crusher-sold by certified Suppliers,such as Jaw / Cone / Impact / Mobile Crusher,etc.
GET QUOTE
