The recovery ratio of longwall top coal caving (LTCC) technology is an important measure its effectiveness. However, the single-opening sequential in thick and extra-thick seams needs improvement. To address this, independent cluster-group proposed this study. Four numerical simulation experiments were conducted to compare drawing balance four-opening technology. Results show that approximately 6% higher than when thickness broken gangue layer seam are same. Additionally, a judgment formula...

In order to reduce roof-floor blind area of hydrofracture in underground mines, expand influenced range fracturing, improve the effect hydrofracture, a pressure relief and permeability increase model hydraulic fracturing was built on basis analysing mechanism crack initiation characteristics fracture development. After discussing directional carrying out related numerical simulation, technique proposed. The coal development distribution rule process analysed, applied F15-31010 mining...

In order to study the instability mechanism of hydraulic support in downdip and updip coal face, taking four-leg type as an example, a stability plane mechanical model "hydraulic support-shifting ram" both unloaded loaded states was established. The discriminant shifting ram's participation balance supportand judgment criteria for standard form critical load were obtained. Theoretical analysis numerical calculations show that ram face greatly improves support. force on is greater than...

Abstract The rapid and accurate forecasting of performance in the Steam-Assisted Gravity Drainage (SAGD) process for oil sands is crucial reasonable design development plan. This study aims to address this need by presenting novel data-driven indicators based on support vector regression (SVR), a machine learning method that complements traditional physics-driven approach. During SAGD process, steam injected into reservoir heat bitumen, reducing its viscosity, allowing it flow towards lower...

The optimization of top coal caving technology is an efficient method to improve the recovery ratio in longwall (LTCC). In extrathick seams, conventional single-opening sequential (SOSCT) shows following problems: low ratio, high rock mixed and poor drawing balance. For these problems, this research verifies applicability multiopening (MOCT) seams theoretically. However, different sequences have a great effect on mechanism. Based progressive sequence cluster-group-support, paper firstly...

The pilot less fruit-transportation gyro car works in the economic forest, avoiding obstacle on rail is prerequisite of its safe working. An ultrasonic avoidance system based ARM embedded introduced this article. functions are implemented. It could make stop when detect an and sends information to monitoring client through GPRS. Through test, performs well reliable.

Owing to the increasing applications and popularity of grouting reinforcement technology for water control in mine floors, its effect is becoming increasingly concerning. However, lack an effective evaluation method floor composite limestone aquifers under different treatment modes can lead blindness randomness engineering. Thus, based on engineering practices, we analyzed prevention inrush from working face transformation modes. Moreover, established a sub-model “pipe pile” that was...

This paper presents a new ARM+GPRS structure which can apply in the orchard soil information collection and transmission. It is design of data acquisition wireless transmission control system based on ARM9 with microprocessor chip S3C2410, it used for realtime acquisition, between upper lower computers through GPRS module. describes that how hardware platform works to accomplish by software. The consists core processor, module communication has been proved experiments features small size,...

Slip and instability of coal‐rock parting‐coal structure (CRCS) subjected to excavation disturbance can easily induce dynamic phenomena in deep coal mines. In this paper, the failure characteristics influencing factors CRCS slip were investigated by theoretical analysis, numerical simulations, field observations. The following main results are addressed: (1) induced due stress release, damage rock parting is partitioned into three parts: shear zone, slipping splitting zone from inside...

In combination with the geological conditions of Tie'er mining area in Tangshan coal mining, this paper not only analyzes evolution overlying strata structure stope and development law separation, also proposes a new continuous grouting technology large flow high concentration slurry. The industrial test showed that, when grout-mining ratio whole is 25.3%, reducing subsidence 51.5%, effect surface good. According to chemical analysis water quality ingredients slurry, result showed, heavy...

Abstract A sizable number of heavy oil reservoirs that are developed by SAGD in Xinjiang Oilfield China heterogeneous and shaly. Particularly the distribution shale barriers between horizontal segments injector producer has significant impact on steam chamber development. Conventional circulation approach does not consider location barriers, where poor or no develops after converting to production mode consequently. In order achieve uniform heat communication, practical methods operation...

To grasp monorail car's position and speed information in time used orchard yard, this article introduce a GPRS communication technology for wireless location measurement. ARM9 microprocessor is selected as remote controller, rotary encoder providing with initial information. The design, which uses to accomplish data transport control, represents software design hardware design. It proved be available by consequence.

The information of urban road surface facilities cannot be updated in a timely fashion. This has been identified as an urgent problem to manager some cities China where the speed economic development and population growth is fast. paper presents Urban Road Surface Facilities Management System (URSFMS) based on Mobile Mapping for updating system database timely. URSFMS designed developed base Wuhan LD2000-R MMS, which can efficiently low-cost acquire its facilities. adopts C/S software...