Aiming at ameliorate poor working environment and high temperature in deep excavation roadway, cooling rate η, optimal k-value solution were used as the evaluation index. The on-site measurement simulation based on Comsol software to test predict effect of ventilation −652 m roadway Xiadian Gold Mine. results show that weight three factors affecting is: k > S ΔT, η are exponentially related all factors. When slope is larger than 0.1, increase air volume does not change too much while cost...

The stability of the backfill barricade is an important foundation for safe mining production. material transported to underground mined-out area. During backfilling process, it difficult directly monitor curing process body and its lateral load on barricades. This severely affects accurate formulation strategy as well effective control associated costs. In order investigate change law pressure barricade, a continuous monitoring experiment was conducted by installing sensors inside...

With the popularization of IC card in urban public transit, data plays a much more important role transit planning. Through analyzing data, this paper proves that is able to partly substitute got by complicated resident trips survey. The bus arriving time obtained on-bus survey complete those and stops OD matrix from card. processed Furness Method get Bus which can be used planning network optimization.

Flocculation is important in the thickening process to improve underflow concentration thickeners for tailing suspensions. Traditional zone settling velocity (ZSV) functions ignore effect of flocculant dosage on ZSV and behavior thickeners. To investigate flux function, a series batch tests were conducted at various dosages unclassified fine tailings. The correlation among dosage, solid fraction, parameters function was revealed. Moreover, simulation continuous based performed. Results...

Cemented paste backfill (CPB) technology has been applied quite popular around the world. Yield stress is a key factor determining whether CPB could be transported. In order to reveal effect of solid components on yield CPB, uniform design experimental program (four factors and six levels) was conducted test rheological property mine’s CPB. The tested four including mass fraction, cement versus other solids ratio, coarse tailings, gravel contents were considered during experiment design....

Overall performance of composite calcium silicate boards (CCSBs) was investigated to further promote their application. The alkali activators were used fully hydrate the and silicon raw materials, which improved comprehensive CCSBs made four pure industrial solid wastes. Within range dosage in this study, single doping different proportions activator flexural strength CCSB. Based on this, mechanical properties CCSB as compounded optimized. Flexural is when average pore diameter refined....

Sedimentation of filling materials could cause pipe blocking accident in mines. However, few quantitative characterization studies have investigated the sedimentation characteristics materials. In this study, property iron tailings with a cement-sand ratio 1 : 4 and mass concentration 73%∼82% was based on rheology measurements. Results showed that shear stress increased as rate rose from 0 s −1 to 120 . The material well. when reversed , presented an increase-constant-decrease change pattern...

For the high-temperature thermal hazards faced by deep underground engineering, it is proposed that water flow borehole with corresponding specifications and quantities were arranged in constant temperature zone to form a network. Water engineering was led network for cooling recycling. The reasonable spacing of boreholes studied using ANSYS FLUENT achieve an optimal effect. results show main factors influencing Xiadian gold mine are velocity v, diameter Ф, length L rock conductivity λ....

The objective was to design a feasible drying method increase the retention rates of phytoene (PT), phytofluene (PTF) and lycopene (LYC) in tomato powder. compare effects vacuum freeze-drying (FD), (VD) hot-air (HAD) technologies on pulp rich PT, PTF LYC. When dried by HAD, LYC decreased significantly (p < 0.05) only when water content from 30% 3.5%. VD, temperatures had no significant effect rates, alkaline conditions (pH = 9), Fe3+ Al3+ could reduce 0.05). Therefore, combined process (CDP)...

The interval time between successive filling processes in a stope is critical parameter for metal mines. It imperative to accurately determine this time. relationship curves curing and heavy hammer settlement height under various types of cementing materials slurry concentration conditions were obtained through the self-developed experiment. mathematical model was fitted regressed, with further analysis impact material type on initial setting results demonstrate an exponential height,...

The optimization of mixing time could benefit transport and mechanical performances paste due to the enhancement cement dispersion fluidity induced by process.However, research on effects during preparation has rarely focused reasons mechanisms for changes in characteristic properties.In this paper, a mining system was simulated based similarity principle that recorded slump mechanism among several modes clarify principles with which process affected paste's properties.The results indicated...

Logistics element capability is a key factor in improving service of distribution center. After analyzing the process logistics processes and characteristics center, system model was built based on TPN (Timed Petri Net), Arena software used to achieve simulation. By result simulation, bottlenecks were found eliminated, which optimized capability. Moreover, validity method verified through exemplification.