scholarly journals Prediction of Stope Stability Using Variable Weight and Unascertained Measurement Technique

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Qian Kang ◽  
Yunmin Wang ◽  
Shuwen Zhang ◽  
Chengzhi Pu ◽  
Chuxuan Zhang
Keyword(s):  
Rock Joint ◽  
Evaluation Index System ◽  
Groundwater Seepage ◽  
Rock Quality ◽  
Variable Weight ◽  
Risk Grade ◽  
Strength Rock ◽  
Index Weight ◽  
Measure Evaluation

A new model is established to analyze mining stope stability, using variable weight theory to calculate the index weight for each factor in different stopes and unascertained measure evaluation technique to predict the risk grade of stope stability. In this model, an evaluation index system by virtue of the 7 most important factors is established, including rock saturated uniaxial compressive strength, rock quality designation, rock joint and fissure, stope span, condition of pillar, groundwater seepage volume, and rate of supporting pit roof. And each index is divided into 5 grades by assignment value and the classification method of standardization. Accordingly, the analysis result is also classified into 5 risk grades. This model is used for the 6 main stopes from the -270 m section in Xin-Qiao Mine, China. The results, giving risk grade for each stope and guiding the use of corresponding measures, avoided the problem of state out of balance caused by conventional invariable weight theory models and have ensured no accident occurred in mining production in recent years. This model can be used in other mines widely, by assigning values for the 7 factors on basis of current in situ cases.

An Evaluation Model of Enterprise Informatization Level Based on Grey Whitenization Weight Cluster Analysis

2011 ◽  
Vol 189-193 ◽  
pp. 823-829
Author(s):  
De Ling Yang ◽  
Wan Ming Chen
Keyword(s):  
Cluster Analysis ◽  
Index System ◽  
Evaluation Model ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Enterprise Informatization ◽  
Grey Incidence Analysis ◽  
Index Weight ◽  
Incidence Analysis

According to the existing insufficiency of researches of enterprise informatization level evaluation, building an evaluation model of enterprise informatization level based on grey whitenization weight cluster analysis. First, based on the existing research, build an evaluation index system of enterprise informatization level. Then, by using grey incidence analysis idea, put forward a method to determine index weight. And then, construt an evaluation model of enterprise informatization level based on grey whitenization weight cluster analysis. Finally, test the validity of the model through the application example.

Measuring while drilling in Florida limestone for geotechnical site investigation

2020 ◽  
Vol 57 (11) ◽  
pp. 1733-1744
Author(s):  
Michael Rodgers ◽  
Michael McVay ◽  
David Horhota ◽  
Jose Hernando ◽  
Jerry Paris
Keyword(s):  
Site Investigation ◽  
Strength Assessment ◽  
Rock Mass Characterization ◽  
Rock Quality ◽  
Drilling Parameters ◽  
Drilling Parameter ◽  
Geotechnical Design ◽  
Parameter Ranges ◽  
Interdependent Relationships

Florida limestone can be challenging to recover during coring operations, as the rock generally is soft, porous, and often highly weathered. Low recoveries coupled with poor rock quality are common in Florida, which limits the data available for geotechnical design. However, the low recoveries and poor rock quality may be attributable to coring techniques and not the rock’s in situ condition. This paper explores integrating measuring while drilling (MWD) into standard coring procedures to provide in situ strength assessment and optimize core recoveries and rock quality to improve rock mass characterization. Six drilling parameters were monitored during the research, and a controlled drilling environment was developed to investigate each monitored parameter’s effects. Variable drill bit configurations were also explored to investigate the effects of bit geometry. Interdependent relationships between the drilling parameters were discovered and a new concept of operating within optimal drilling parameter ranges based on these relationships is introduced. The coring practices developed in the controlled environment were then tested in natural Florida limestone. It was concluded that operating within the optimal ranges allows in situ strength assessment and improves core recoveries and rock quality.

Field Test of Ethanol/Bentonite Slurry Grouting into Rock Fracture

2006 ◽  
Vol 932 ◽  
Author(s):  
Motoyuki Asada ◽  
Hitoshi Nakashima ◽  
Takashi Ishii ◽  
Sumio Horiuchi
Keyword(s):  
Rock Fracture ◽  
Ground Surface ◽  
Rock Fractures ◽  
Natural Clay ◽  
Groundwater Seepage ◽  
Low Viscosity ◽  
Grouting Material ◽  
Bentonite Slurry ◽  
Bentonite Grout

ABSTRACTCrystalline rocks have fractures which may cause unexpected routes of groundwater seepage. Cement grouting is one of the most effective methods to minimize seepage; however, cement materials may not be suitable for the purpose of extra-long durability, because cement is neutralized or degraded by chemical and physical influence of chemical reaction.Natural clay like bentonite is one of the most promising materials for seepage barrier; however, water/bentonite grout is so viscous that enough amount of bentonite can not be grouted into rock fractures. To increase bentonite content in grout with low viscosity, the utilization of ethanol as a mixing liquid was studied. Ethanol suppresses bentonite swelling, and more bentonite can be injected more than that of water/bentonite slurry. In this paper, grouting into in-situ rock mass fracture from the ground surface was tested to investigate the barrier performance and workability of ethanol/bentonite slurry as a grouting material.

scholarly journals The evaluation of college students’ innovation and entrepreneurship ability based on nonlinear model

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Guihong Liang ◽  
Daniyal M. Alghazzawi ◽  
Nympha Rita Joseph
Keyword(s):  
College Students ◽  
Structural Model ◽  
Evaluation Model ◽  
Entrepreneurship Education ◽  
Colleges And Universities ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Ecological Environment ◽  
Index Weight ◽  
Innovation And Entrepreneurship

Abstract Under the background of ‘mass entrepreneurship and innovation’, Chinese colleges and universities have strengthened students’ entrepreneurial and innovative abilities. The article first analyses the reasons why applied universities should strengthen innovation and entrepreneurship education. On this basis, the evaluation index system of students’ innovation and entrepreneurship ability is constructed. The thesis uses the nonlinear structural model to complete the index weight setting. Finally, the paper verifies the effectiveness of the combined evaluation model through the data on innovation and entrepreneurship of college students in an university where applied. At the same time, the article proposes measures for optimising the ecological environment of innovation and entrepreneurship education for colleges and universities.

Usability Evaluation of Welding Clamp Based on Improved Fuzzy Synthetic Evaluation Model

2012 ◽  
Vol 159 ◽  
pp. 400-404
Author(s):  
Ji Yan Li ◽  
Zhi Bing Yang
Keyword(s):  
Evaluation Method ◽  
Evaluation Model ◽  
Usability Evaluation ◽  
Evaluation Index System ◽  
Fuzzy Synthetic Evaluation ◽  
Ahp Method ◽  
Overall Evaluation ◽  
Index Weight ◽  
Quantitative Indexes ◽  
Synthetic Evaluation

Usability is the basic properties of the product, and it is the overall evaluation to the product usability. In this paper, firstly, establish a usability evaluation index system of the welding clamp. Then, use the improved fuzzy synthetic evaluation method to assess the usability of welding clamp. In an improved fuzzy synthetic evaluation model, the index weight which is identified by using AHP method is amended objectively by using entropy technology, the resolution ratio is improved by classifying the differences between qualitative indexes and quantitative indexes. Finally, get the evaluation results of the usability of a welding clamp according to the method above.

A Kind of Network Security Evaluation Method Based on Local Variable Weight

2011 ◽  
Vol 474-476 ◽  
pp. 527-530
Author(s):  
Yu Jiao Wang ◽  
Hai Yun Lin
Keyword(s):  
Network Security ◽  
Evaluation Method ◽  
Evaluation Index System ◽  
Security Evaluation ◽  
Security Level ◽  
Evaluation Result ◽  
Comprehensive Method ◽  
Variable Weight ◽  
Effective Network ◽  
Local Variable

The basis to build effective network security protection is to reasonably evaluate on network security. Based on analysis on shortcomings of existing network security evaluation methods, the paper built network security evaluation index system according to CC specifications. The advantages of local variable weight comprehensive method were analyzed and the method of network security evaluation based on combination of AHP and local variable weight was presented. The evaluation example on some network elements indicates that the method evaluate on overall information security level, so that the evaluation result be objective and reasonable.

Data Processing in Project Supply Chain Vendor Selection Based on Improved Entropy Weight - Grey Correlation - TOPSIS

2014 ◽  
Vol 1046 ◽  
pp. 545-549 ◽  
Author(s):  
Qiu Qin Lu ◽  
Qiao Zhao
Keyword(s):  
Supply Chain ◽  
Entropy Method ◽  
Evaluation Index System ◽  
Ideal Solution ◽  
Entropy Weight ◽  
Weighting Method ◽  
Grey Correlation ◽  
Related Data ◽  
Relative Closeness ◽  
Index Weight

On the basis of the establishment of evaluation index system, an improved entropy weight – grey correlation – TOPSIS model is put forward to select project supply chain vendor, and process the related data. The each index weight is obtained from subjective weighting method and objective entropy method. The positive and negative distance between each evaluation object and ideal solution is calculated, and the grey correlation grade between each evaluation object and ideal solution is obtained. Then the relative closeness of each evaluation object can be gained that we can select the best vendor according to it.

Evaluation Framework and Method of the Intelligent Behaviors of Unmanned Ground Vehicles Based on AHP Scheme

2014 ◽  
Vol 721 ◽  
pp. 476-480 ◽  
Author(s):  
Xin Zhang ◽  
Yan An Zhao ◽  
Li Gao ◽  
Dong Hao Hao
Keyword(s):  
Evaluation System ◽  
Evaluation Method ◽  
Evaluation Framework ◽  
Evaluation Index System ◽  
Unmanned Ground Vehicles ◽  
Ground Vehicles ◽  
Scoring Method ◽  
Evaluation Indexes ◽  
Intelligent Behavior ◽  
Index Weight

In order to provide basis and standards to the research on unmanned driving behaviors, a more thorough evaluation system of Intelligent Behavior for Unmanned Ground Vehicles needs to come forward. The intelligent behavior of unmanned ground vehicles in pedestrian crossing scenario is taken as an example in this paper. By using building and analyzing evaluation index system, this paper proposes an evaluation method that can comprehensively expressed the technological performance of unmanned ground vehicles based on Analytic Hierarchy Process (AHP). Compared with traditional methods, this evaluation method takes index weight into sufficient conderations and is more objective. The method properly works out with index weight of specific scenarios that reflects the actual situations. The establishment of comprehensive scoring method objectively and conveniently turns the performances of unmanned ground vehicle into scores, so that the results can be compared and ranked directly. Last but not least, a certain participating vehicle is used for case study. The result proves aforementioned method to be practical, reliable, convenient and logical. It not only evaluates the assessment comprehensively, but also evaluates the index separately to guide researchers to find out the defects of unmanned driving vehicle evaluation indexes and point out ways to improve them.

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