- [email protected]
- No.416 Jianye Road, South Jinqiao Area, Pudong, Shanghai, China
Optimization of Caving Technology in an Extrathick Seam with …
In summary, the multiopening caving technology (MOCT) is an inevitable choice to improve mining efficiency in extrathick coal seams. To further improve the recovery ratio and …
WhatsApp: +86 18221755073
Optimization of drawing sequence in longwall top coal …
This model takes into account predetermined cutting and caving ratios, as well as drawing intervals. To examine the caving process and roof particles, three different drawing sequences were examined: sequential …
WhatsApp: +86 18221755073
CN106522953A
The invention provides a dynamic segmented mining and caving technique for strike long-wall full-mechanized caving mining of a high-dipping thick coal seam.
WhatsApp: +86 18221755073
Surface Deformation Calculation Method Based on …
by segmented caving mining. More importantly, these two methods essentially calculate the overall ground deformation as continuous deformation and are not suitable for calcu-lating the overall discontinuous deformation of the ground caused by segmented caving mining in …
WhatsApp: +86 18221755073
Cutting slot drilling machine-Jinyue Mining
Cutting slot drilling machine JY-AT1000L cutting slot patio drilling rig is developed by Hunan Jinyue Mine Technology Co., Ltd. to adapt to the mining technology of VCR segmented caving method, which can meet the needs of underground mines to dig a large number of short and small diameter cutting slot patios and shafts from bottom to top, and is used to build vertical or …
WhatsApp: +86 18221755073
Surface Deformation Calculation Method Based on
deformations caused by segmented caving mining and have achieved good results in many cases, the irregular nature of metallic ore deposits means that the surface defor-
WhatsApp: +86 18221755073
CN108915687A
High-dipping is segmented digging integration Sub-Level Caving coal-mining method, includes the following steps：（1）Select coal seam；（2）Coal seam is divided into several exploiting fields, is divided into several pieces in the segmentation of rectangle along seam inclination direction in an exploiting field；（3）First one piece of segmentation of exploiting field lowest part is ...
WhatsApp: +86 18221755073
Cut Blasting Optimization Using 3D Laser Scanning and …
For the non-bottom pillar segmented caving method commonly used in metal mines, the excavation speed of full section tunnel blasting is crucial. This speed is primarily determined by the effectiveness of cut blasting. A well-designed cut blasting method facilitates rock fragmentation and ejection within the cut cavity, providing additional free ...
WhatsApp: +86 18221755073
CN106522953A
The invention provides a dynamic segmented mining and caving technique for strike long-wall full-mechanized caving mining of a high-dipping thick coal seam. The technique comprises the steps that two roadways are excavated in the high-dipping thick coal seam to serve as a transportation roadway and an air return roadway correspondingly, a strike long-wall full-mechanized caving …
WhatsApp: +86 18221755073
Caving Mining Method Classification and …
Segmented rock drilling, ore caving and ore drawing are carried out in the stoping roadway. Sublevel caving method is mainly used in the mining of iron ore deposits, most of which are newly built mines. At each stage, the …
WhatsApp: +86 18221755073
Behaviors of overlying strata in extra-thick coal seams using top …
Using conventional top-coal caving method, the scale of roof movement in extra-thick coal seam can expand apparently and the main roof will turn into immediate roof. Generally, two kinds of structures of near field in extra-thick coal seam will form. One is a key stratum in immediate roof located in caving zone during mining process where a ...
WhatsApp: +86 18221755073
Segmented Woodturning Using Jig
%PDF-1.7 %µµµµ 1 0 obj >/Metadata 576 0 R/ViewerPreferences 577 0 R>> endobj 2 0 obj > endobj 3 0 obj >/Pattern >/Font >/ProcSet[/PDF/Text/ImageB/ImageC/ImageI ...
WhatsApp: +86 18221755073
A cutting method for sub-cave mining
A segmented caving method and cutting method technology, which is applied in the cutting field of segmented caving mining, can solve problems such as difficulty in excavation, gun smoke …
WhatsApp: +86 18221755073
(PDF) Optimization calculation of stope structure …
Mathews stability graphic method, based on the rock classification system, measures the stability of the ore roof area of a relatively simple calculation method and provides a theoretical basis ...
WhatsApp: +86 18221755073
CN105422100A
The invention provides a horizontally segmented high yield roadway layout for sharply inclined coal bed and a coal caving mode. According to the method, the roadway layout, the coal caving mode, and top coal high pressure water infusion are optimized to improve the mining rate of top coal. Fully mechanized caving faces of horizontal sections are arranged along the horizontal …
WhatsApp: +86 18221755073
Structural Parameter Optimization for Large Spacing Sublevel Caving …
Non-pillar sublevel caving is beginning to use large structural parameters in China. Appropriate structural parameters can effectively control the loss and dilution of stope and improve ore ...
WhatsApp: +86 18221755073
Caving Method, Classification and Application of the
Caving method is the ore mining method of filling the goaf with forced or natural caving wall rock to manage the ground pressure with the advance of the work face, without regard to the stope room and ore pillar. Its basic feature is to cave wall rock, collapsing and releasing ore under overlaying rock. It is applicable to the ore body where ...
WhatsApp: +86 18221755073
Structural Parameter Optimization for Large Spacing Sublevel Caving …
Non-pillar sublevel caving is beginning to use large structural parameters in China. Appropriate structural parameters can effectively control the loss and dilution of stope and improve ore drawing efficiency. In this study, taking Chengchao Iron Mine as the engineering background, a theoretical calculation, a numerical simulation, and physical similarity experiments were …
WhatsApp: +86 18221755073
A Physical Model for Demonstrating Segmental Caving without …
A segmented caving method and physical model technology, applied in the field of underground mining, can solve problems such as understanding abstraction and teaching demonstration …
WhatsApp: +86 18221755073
Not Caving into Extinction – MBZ Conservation Fund Annual …
Not Caving into Extinction. Protecting the rarest spider in the world and the unique animals with which it shares its home. Batu Cave Trapdoor Spider ... with features such as a segmented abdomen. The species was first described by western explorers in 1923 but in the intervening years, the species occurrence has declined because of human ...
WhatsApp: +86 18221755073
A new diversion drawing technique for controlling ore loss and …
High ore loss and dilution, which are mainly caused by direct contact between blasted ore and caved rock, generally exist in the process of exploiting inclined medium-thick ore bodies using the sublevel caving method. An improved diversion drawing technique was proposed with the aim of controlling ore loss and dilution by changing the flow path and velocity of caved …
WhatsApp: +86 18221755073
AY Honor Caving Answer Key
If you do not know an experienced caver, see requirement 3 for a link to a list of local caving clubs. 2. List all equipment needed for a successful caving trip excluding vertical equipment and start putting together your own set of equipment. ... Segmented worms, snails, copepods, spiders, phalangids, mites, pseudoscorpions, millipedes, cave ...
WhatsApp: +86 18221755073
(PDF) Optimization of drawing sequence in longwall top coal …
To examine the caving process and roof particles, three different drawing sequences were examined: sequential drawing, segmented sequential drawing, and …
WhatsApp: +86 18221755073
Caving Mining Method Classification and Characteristics
JY-AT1000L cutting slot patio drilling rig is developed by Hunan Jinyue Mine Technology Co., Ltd. to adapt to the mining technology of VCR segmented caving method, which can meet the …
WhatsApp: +86 18221755073
Surface Deformation Calculation Method Based on Displacement …
However, in the segmented caving method of metal mining, the presence of sinkholes in the caving zone makes it difficult to determine this parameter. Furthermore, the maximum settlement value on the ground surface is generally located within the sinkhole, which significantly affects the ground deformation in the nearby area.
WhatsApp: +86 18221755073
Segmented Turning Patterns: Elevate Your Woodcraft!
First, arrange the segments in the desired pattern. Use a glue that dries quickly. Make sure each segment is aligned perfectly. Secure the segments with clamps.Wait for the glue to dry completely. Once dry, mount the glued segments onto the lathe.Ensure the segments are centered on the lathe. Tighten the lathe's chuck to hold the segments firmly. Start the lathe at …
WhatsApp: +86 18221755073
Study on Optimization of Stope Structure Parameters for …
To solve the problem of large ore loss and dilution in the high-end wall sublevel caving method of Xilinhot fluorite mine, it is necessary to select proper stope structure parameters.
WhatsApp: +86 18221755073
CN102953732A
The invention discloses a room-and-pillar major-diameter longhole inverted-step-like segmented lateral caving subsequent filling mining method for a steeply-inclined medium-thick orebody and gently-inclined and inclined extremely-thick orebodies with steady surrounding rocks at upper and lower panels. The method is characterized in that: an orebody is divided into panels, then the …
WhatsApp: +86 18221755073
Sublevel Caving Method Without Sill Pillar | SpringerLink
Advantages of sublevel caving method without sill pillar: the stope has a simple structure, which is beneficial for the operation of large mechanized trackless self-propelled equipment; no need to maintain pillars, high adaptability to changes of ore body, concentration and stoping of the orebodies of various grades and with horse stones, and high flexibility; the …
WhatsApp: +86 18221755073
Sublevel caving method with sill pillar is the mining process …
%PDF-1.4 %€„ˆŒ "˜œ ¤¨¬°´¸¼ÀÄÈÌÐÔØÜàäèìðôøü 35 0 obj /T 206091 /L 206837 /Linearized 1 /E 88030 /O 37 /H [ 1212 105 ] /N 2 >> endobj ...
WhatsApp: +86 18221755073