Blasting operations,which are crucial to open-pit mine production due to their simplicity and efficiency,require precise control through accurate vibration velocity calculations.The conventional Sadowski formula mainl...Blasting operations,which are crucial to open-pit mine production due to their simplicity and efficiency,require precise control through accurate vibration velocity calculations.The conventional Sadowski formula mainly focuses on blast center distance but neglects the amplification effect of blasting vibration waves by terraced terrain,from which the calculated blasting vibration velocities are smaller than the actual values,affecting the safety of the project.To address this issue,our model introduces the influences of slope and time into Sadowski formula to measure safety through blast vibration displacement.In the northern section of the open-pit quartz mine in Jinchang City,Gansu Province,China,the data of a continuous blasting slope project are referred to.Our findings reveal a noticeable vibration amplification effect during blasting when a multi-stage slope platform undergoes a sudden cross-sectional change near the upper overhanging surface.The amplification vibration coefficient increases with height,while vibration waves within rocks decrease from bottom to top.Conversely,platforms without distinct crosssectional changes exhibit no pronounced amplification during blasting.In addition,the vibration intensity decreases with distance as the rock height difference change propagates.The results obtained by the proposed blast vibration displacement equation incorporating slope shape influence closely agree with real-world scenarios.According to Pearson correlation coefficient(PPMCC)analysis,the average accuracy rate of our model is 88.84%,which exceeds the conventional Sadowski formula(46.92%).展开更多
In order to improve the stability of the slope and prevent the occurrence of landslide disaster,this study took the east slope of the first mining area of Zhundong Open-pit Coal Mine as the engineering background,and ...In order to improve the stability of the slope and prevent the occurrence of landslide disaster,this study took the east slope of the first mining area of Zhundong Open-pit Coal Mine as the engineering background,and used a combination of the two-dimensional limit equilibrium method and three-dimensional numerical simulation to optimize the shape of the east slope.By selecting a typical calculation profile based on the Bishop method and the residual thrust method in the two-dimensional rigid body limit equilibrium method,this research carried out the stability analysis of the profile slope,and preliminarily designed the slope shape of the profile position meeting the requirements of the safety reserve coefficient and stripping ratio.Based on the three-dimensional finite element strength reduction method,this paper investigated the reasonably change of the width of the transport plate to solve the problem of the slope shape that does not meet the requirements of safety reserve coefficient and stripping ratio,and established a three-dimensional numerical simulation model of various schemes.It also studied the influence of different tracking distances and slope angles on slope stability,calculated the threedimensional stability of the slope under different spatial forms,then determined the optimal tracking distance and optimal slope angle,and further optimize the slope stability and stripping ratio.The results show that:when the width of the transport plate of the DBS3 section slope is 8 m,it does not meet the requirement of safety reserve coefficient 1.2;when the width of the transport plate is set to 24 m,it meets the requirement of a safety reserve coefficient of 1.2 and an economic stripping ratio of not more than 8.0 m^(3)/t.The three-dimensional numerical simulation results concluded that the optimal tracking distance on the east side is 50 m,and the optimal slope angle is 35.After the optimization design of a two-dimensional and three-dimensional slope shape,2.456 million tons of coal resources were mined,creating a profit of about 21.1268 million yuan.It not only prevents landslide disasters,but also further improve the recovery rate of coal resources.展开更多
This paper focused on the extracting method of single slope shape. Applying the software of ARCGIS 9.0, DEM (digital elevation model) was established. From the DEM, topographic characters, including valleys and ridges...This paper focused on the extracting method of single slope shape. Applying the software of ARCGIS 9.0, DEM (digital elevation model) was established. From the DEM, topographic characters, including valleys and ridges were extracted. Some valley lines were extended in order to intersect with the ridges nearby. All slope were divided into different slope surface, which enclosed by valleys and ridges. And the slope surface shapes were defined three types, Line Slope, Upper-concave and lower-convex slope, Upper-convex and lower-concave slope, according to their functions. And the judge formula of single slope surface shape was brought forward. Taking Wanzhou District as test area, it indicates that auto-extracting method of single slope surface shape has high precision relatively. This study can provide references to the studies of region geological disasters prevention and cure.展开更多
The space effects of oval-shaped furrow pit slopes were analyzed by the elastic mechanics principle.The interaction of limit equilibrium slope angle,friction coefficient,cohesion and horizontal radius of oval-shaped f...The space effects of oval-shaped furrow pit slopes were analyzed by the elastic mechanics principle.The interaction of limit equilibrium slope angle,friction coefficient,cohesion and horizontal radius of oval-shaped furrow pits has been derived.The oval trumpet-like rock mass is homogeneous and elastic while only loaded by its dead weight.The interaction indicates that the deeper an oval-shaped furrow pit is excavated,the greater the limit equilibrium slope angle.Both the theory base for reducing stripping waste rock in an oval-shaped furrow pit and the basic way to determine the configuration of a stable slope were developed from the mentioned interaction.The theory includes the preceding principles of stability analysis of slopes.Compared with the configuration determined by traditional theory of slope stability,a great quantity of stripping waste rock can be reduced by that determined in this paper under stable conditions.展开更多
文摘Blasting operations,which are crucial to open-pit mine production due to their simplicity and efficiency,require precise control through accurate vibration velocity calculations.The conventional Sadowski formula mainly focuses on blast center distance but neglects the amplification effect of blasting vibration waves by terraced terrain,from which the calculated blasting vibration velocities are smaller than the actual values,affecting the safety of the project.To address this issue,our model introduces the influences of slope and time into Sadowski formula to measure safety through blast vibration displacement.In the northern section of the open-pit quartz mine in Jinchang City,Gansu Province,China,the data of a continuous blasting slope project are referred to.Our findings reveal a noticeable vibration amplification effect during blasting when a multi-stage slope platform undergoes a sudden cross-sectional change near the upper overhanging surface.The amplification vibration coefficient increases with height,while vibration waves within rocks decrease from bottom to top.Conversely,platforms without distinct crosssectional changes exhibit no pronounced amplification during blasting.In addition,the vibration intensity decreases with distance as the rock height difference change propagates.The results obtained by the proposed blast vibration displacement equation incorporating slope shape influence closely agree with real-world scenarios.According to Pearson correlation coefficient(PPMCC)analysis,the average accuracy rate of our model is 88.84%,which exceeds the conventional Sadowski formula(46.92%).
基金funded by Foundation Projects:National Natural Science Foundation of China (No.52204136)Natural Sci-ence Foundation of Liaoning Province (No.2022-BS-327).
文摘In order to improve the stability of the slope and prevent the occurrence of landslide disaster,this study took the east slope of the first mining area of Zhundong Open-pit Coal Mine as the engineering background,and used a combination of the two-dimensional limit equilibrium method and three-dimensional numerical simulation to optimize the shape of the east slope.By selecting a typical calculation profile based on the Bishop method and the residual thrust method in the two-dimensional rigid body limit equilibrium method,this research carried out the stability analysis of the profile slope,and preliminarily designed the slope shape of the profile position meeting the requirements of the safety reserve coefficient and stripping ratio.Based on the three-dimensional finite element strength reduction method,this paper investigated the reasonably change of the width of the transport plate to solve the problem of the slope shape that does not meet the requirements of safety reserve coefficient and stripping ratio,and established a three-dimensional numerical simulation model of various schemes.It also studied the influence of different tracking distances and slope angles on slope stability,calculated the threedimensional stability of the slope under different spatial forms,then determined the optimal tracking distance and optimal slope angle,and further optimize the slope stability and stripping ratio.The results show that:when the width of the transport plate of the DBS3 section slope is 8 m,it does not meet the requirement of safety reserve coefficient 1.2;when the width of the transport plate is set to 24 m,it meets the requirement of a safety reserve coefficient of 1.2 and an economic stripping ratio of not more than 8.0 m^(3)/t.The three-dimensional numerical simulation results concluded that the optimal tracking distance on the east side is 50 m,and the optimal slope angle is 35.After the optimization design of a two-dimensional and three-dimensional slope shape,2.456 million tons of coal resources were mined,creating a profit of about 21.1268 million yuan.It not only prevents landslide disasters,but also further improve the recovery rate of coal resources.
文摘This paper focused on the extracting method of single slope shape. Applying the software of ARCGIS 9.0, DEM (digital elevation model) was established. From the DEM, topographic characters, including valleys and ridges were extracted. Some valley lines were extended in order to intersect with the ridges nearby. All slope were divided into different slope surface, which enclosed by valleys and ridges. And the slope surface shapes were defined three types, Line Slope, Upper-concave and lower-convex slope, Upper-convex and lower-concave slope, according to their functions. And the judge formula of single slope surface shape was brought forward. Taking Wanzhou District as test area, it indicates that auto-extracting method of single slope surface shape has high precision relatively. This study can provide references to the studies of region geological disasters prevention and cure.
文摘The space effects of oval-shaped furrow pit slopes were analyzed by the elastic mechanics principle.The interaction of limit equilibrium slope angle,friction coefficient,cohesion and horizontal radius of oval-shaped furrow pits has been derived.The oval trumpet-like rock mass is homogeneous and elastic while only loaded by its dead weight.The interaction indicates that the deeper an oval-shaped furrow pit is excavated,the greater the limit equilibrium slope angle.Both the theory base for reducing stripping waste rock in an oval-shaped furrow pit and the basic way to determine the configuration of a stable slope were developed from the mentioned interaction.The theory includes the preceding principles of stability analysis of slopes.Compared with the configuration determined by traditional theory of slope stability,a great quantity of stripping waste rock can be reduced by that determined in this paper under stable conditions.
