bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental study on ultra high pressure hydraulic cutting seam pressure relief and permeability enhancement of strip drilling along seam in C19 coal seam of Shiping No.1 Coal Mine
Authors: Lu Zhanjin , Ji Fei 
Published: July 2021

Abstract
In view of the low permeability of C19 coal seam in Shiping No.1 coal mine, the large amount of drilling work and the long time of reaching the standard of extraction, which seriously restricts the replacement of mining, the ultra-high pressure hydraulic cutting technology is adopted to improve the permeability of coal seam. After using ultra-high pressure hydraulic slotting, the average single hole chip removal is 3.31t, the average chip removal per cutter is 0.38t, the width of slotting slot is 4cm, and the equivalent radius of slotting slot is 1.59m. The field test results show that the pressure relief and permeability enhancement effect of 11719 lifting machine roadway (East) in Shiping No.1 mine is significantly improved under this parameter condition. The single hole drainage pure quantity of slotted drilling is 7.8 times that of ordinary drilling, the concentration is increased by 2-2.4 times, the drilling construction quantity is reduced by 30.6%, the drilling drainage time is shortened by 80.7%, and the drilling gas drainage efficiency is greatly improved.
Recognition of sedimentary characteristics in P zone of X oilfield
Authors: Wu Hongjun 
Published: July 2021

Abstract
According to the detailed description of the carrier bed Daqing delta fluvioglacial deposits, channel the sand package of the oil field is intermittently developed and the forecasting function is not sufficient with the expansion of the oil field to find suitable blocks, the principle of high-resolution stratigraphic sequence and the re-examination of the sedimentary system and characteristics of the sediments of the oil field have been introduced. By accurately comparing the strata, a sequence structure of 12 sediment units of the P oil reservoir of a given oil field was established, and sediment microfacies were subdivided. Through a study of the sediment characteristics of the oil reservoir P of the oil field come to be more continuous and extended than previously thought. Moreover, it is essential for the gradual development capacity of irreducible oil.
Study on risk assessment of EPC water conservancy project based on entropy weight set pair analysis
Authors: Meng Jinbo , Zhang Jixiang 
Published: July 2021

Abstract
In recent years, EPC mode has been developed rapidly in water conservancy projects. However, due to the complex construction conditions, long construction period and easy to be affected by natural conditions of water conservancy project, the general contractor of EPC project is faced with greater risks. If the risk analysis is not enough, the project profit of the contractor will be lower than expected or even loss. Water conservancy project risk indicators are qualitative indicators, which are easily affected by subjective factors and quantitative uncertainty in the process of index quantification. In this paper, combined with the relevant research at home and abroad, combined with the characteristics of water conservancy projects, the establishment of water conservancy project risk assessment level index system. The set pair analysis model which can comprehensively evaluate the connection degree between risk index and risk level and the entropy weight model which can reflect the information content of the index are introduced into the risk evaluation of EPC water conservancy project. The evaluation results show that the entropy weight method can calculate the weight of each risk index in the risk level, and the set pair analysis method can comprehensively evaluate the connection degree between the risk index and different risk levels.
Study on creep characteristics and evolution model of slide body in D area of Qinyu landslide
Authors: Xie Wenbin , Bao Xiaojun , Liu Gao , Li Jinqi , Sun Cheng 
Published: July 2021

Abstract
The geological conditions are complex in the Longnan mountain area, and the landslide disasters are widely distributed and numerous, among which the large accumulation layer landslide is especially developed. This kind of landslide is mostly distributed along the river basin and has the characteristics of multi-phase and multistage. The slide body is mostly in the state of creep plastic flow, and it is easy to revive. In this paper, the creep characteristics and evolution model of the secondary landslide were studied based on the field geological survey and the numerical calculation method, in order to provide reference for the monitoring and treatment of the landslide in this area. The results show that the shear stress and shear strain concentration zone is mainly located near the previous sliding surface of the landslide, and the creep type is deep creep; The deformation of the sliding body in zone D show that the deformation of the trailing edge and the middle front is relatively small, while the deformation of the middle and the leading edge is large; At the present stage, the overall deformation mode of the slide body in the D area of Qinyu landslide is a slow creeping deformation mode of traction from the front, down-shifting from the middle to the back.
Research on permeability increasing technology of low permeability combined rock coal seam
Authors: Ma Shuyin 
Published: July 2021

Abstract
Aiming at the problem of improving the permeability of the low permeability combined rock coal seam and the gas drainage effect of a certain mine, the coal seam field engineering test is adopted, and the method of combining the gas drainage effect before and after hydraulic permeability enhancement is used to carry out the underground field test research. The results show that: in the low-permeability combined rock coal seam, the influence radius of 15m of hydraulic fracturing is adopted, which increases the scalar amount of gas drainage by more than 6.44 times and the concentration of drainage by more than 5 times. Pure gas drainage effect is significant. Hydraulic fracturing enhanced permeability can improve the connectivity between coal pores, reduce the effective stress of the coal body, and increase the permeability of the coal seam. Through engineering tests, a set of hydraulic fracturing enhanced permeability technologies suitable for the low permeability combination rock coal seam of the mine have been formed. It is of great significance to guarantee the safe production of the mine.
Influence of temperature history on calcium leaching resistance of hydraulic concrete
Authors: Na Binbin , Yan Bin 
Published: July 2021

Abstract
In order to find out how temperature history affect leaching resistance, the leaching depths and compressive strength loss rate of pastes under three different temperature histories have been studied, the result shows that, with the progress of leaching, the compressive strength of samples continue to decrease, but the rate of decrease gradually slows down, and the leaching resistance of temperature match curing cured sample is better than that of standard curing cured, while the leaching resistance of circadian cycle curing cured sample is worse than that of standard curing cured.
Analysis and application of stress distribution in 24-m high bench loosening blasting with axially uncoupled charge structure in Barun Open-pit Mine
Authors: Yin Zuoming , Wang Xuguang , Wang Desheng , Dang Zhiheng , Bi Jiahao 
Published: July 2021

Abstract
The Barun Open-pit Mine has formed a 2-benches or 4-benches parallel mining condition due to the steep end-slope mining. In the enlarging process, the operation safety conditions of equipment are poor. In order to improve the operating conditions, increase the efficiency of slope enlarging, and reduce the mining cost, a technical solution is proposed that uncoupling the top air-deck charge structure by loosening blasting in the 24-m high bench. Based on the Holmquist-Johnson-Cook (HJC) constitutive model, the physical mechanism of the stress wave attenuation in the rock is analyzed. Considering the attenuation, reflection, transmission, and superposition of the pressure produced by the charge, the stress of any point in the rock medium is calculated. Furthermore, the rock state at that point is judged. The results show that the top air-deck reduces the stress at the top of the slope. Although the top resistance line is smaller than the bottom of the slope, with the top air-deck, the rock stress state at the top of the slope is not much larger than the bottom charge section, which makes the rock loose and does not produce a throwing phenomenon. After blasting, the muck pile has a good shape. The top air-deck charge structure has obvious effects in loose blasting, which provides a practical exploration for the slope enlarging of high benches in open-pit mines.
Nuclear Magnetic Resonance Experiment of Fluid Redistribution During the Gas Well Gap
Authors: Li Yao , Xu Tonghao , Zhai Shuo 
Published: July 2021

Abstract
In the actual production process of oil and gas reservoirs, the study of the redistribution characteristics of reservoir fluids is of great significance to the optimization of the indirect working system. Based on the nuclear magnetic resonance experiment, this paper analyzes the re-distribution of fluids in the core under the conditions of different shut-in times and different shut-in times. The distribution characteristics were studied. The results show that the water content increases with the increase of shut-in time and the number of shut-in times. For the same core, the water content in the large pores changes significantly.
Evaluation of Information Security of Deep Foundation Pit Reinforcement Scheme
Authors: He Xiaoling , Xu Chunjie , Guo Fang 
Published: July 2021

Abstract
The purpose of deep foundation pit support is to protect the safety of the underground structure and the surrounding environment. This article introduces the reinforcement measures of the deep foundation pit supporting structure in combination with a deep foundation pit on the Huzhou-Hangzhou line; from the material and mechanical point of view, the feasibility of the safe implementation of the deep foundation pit reinforcement plan is analyzed; then the displacement monitoring data obtained confirms that the reinforcement plan can be Improve the overall stability of the deep foundation pit construction, and provide safe and effective guidance for the deep foundation pit construction.
The Effect of Soft Rock and Sand Compound on Soil Nutrient and Environment Enzyme Activity
Authors: Hua Dongwen , Li Juan , Wang Jian 
Published: July 2021

Abstract
In order to study the improvement effect of the Mu Us sandy land in northern Shaanxi, this paper takes the Xiaojihan land improvement project in Yulin City as the research background, and sets up the experiment of 3 kinds of soft rock and sand compound ratios (1:1, 1:2, 1:5) In the plot, statistical analysis methods were used to compare the physical and chemical properties of soil and soil enzyme activities under different treatments. The results show that the addition of soft rock has a significant effect on soil texture and available nutrients, and it increases with the increase of soft rock content. Compared with the original sandy land, the content of water-stable aggregates (<0.25) increases by 42.3%, which is quick-acting the phosphorus content was increased by 89.9%, the available potassium content was increased by 22.3%, and the enzyme activity of the cultivated soil was significantly improved. Among them, the correlation between soil phosphatase and the physical and chemical properties of the soil is relatively high, and it can be used as a measure for judging the fertility of the compound soil index.
Impact of Land and Soil Types Change on Precipitation Infiltration Recharge in Baiquan Spring Basin
Authors: Wang Xiaobo , Shu Longcang , Wang Xin , Dong Yanan , Onan Yao Kouassi Bienvenue Mikael , Ni Hanxi 
Published: July 2021

Abstract
To study the impact of land types change on precipitation infiltration recharge in Baiquan spring basin of Jinan City, the remote sensing monitoring data of land use in 1980, 1990, 2000 and 2018 were selected to analyze the change trend of land types. Based on FEFLOW software, the groundwater flow numerical model of the study area is constructed to analyze the variation of precipitation infiltration recharge in different periods. The results show that: the urban land area expanded rapidly from 1980 to 2018, mainly occupied arable land and woodland, and the urbanization rate in 2018 was 17.18%. In 2018, the precipitation infiltration recharge is 15497.92 × 104 m3/a, 17.20% less than that in 1980. The research results can provide theoretical support and decision-making basis for the urban planning and the sustainability and protection of spring basin.
Numerical Simulation Research on the Displacement of Ground Connecting Wall in Geological Excavation and Soil Remediation
Authors: You Hongyue , Wang Qingbiao , Wang Hui , Liu Junpeng , Zhao Yenan , Tian Yuanyuan , Yang Shuo , Jiang Yanbo 
Published: July 2021

Abstract
Monitoring the changes of the retaining pile wall during the excavation of the deep foundation pit, and accurately grasping the side displacement changes of the retaining pile wall can effectively grasp the safety status of the foundation pit construction. In this paper, taking Guangfo Ring Road as an example, theoretical analysis, numerical simulation and other methods are used to study the influence of foundation pit excavation on the horizontal displacement and deformation of the ground connecting wall during the reinforcement of mixed piles in the area adjacent to high-rise buildings. Get the following conclusion : (1) With reinforced ground connecting walls and non-reinforced ground connecting walls, the horizontal displacement curve of ground connecting walls is roughly the same, showing a trend of change between the larger and the smaller ends. As the excavation depth continues to increase, the changing trend of the “bow” becomes more obvious, which is in line with the changing law of the enclosure structure. (2) After the mixing pile is used for reinforcement, the maximum horizontal displacement of the ground connecting wall is greatly reduced. Compared with the case without reinforcement measures, the horizontal displacement value of the ground connecting wall is 5.66mm, which is reduced by 6.23mm. The reduction ratio is 52%, indicating that the mixing pile has a great inhibitory effect on the horizontal displacement of the ground connecting wall. (3) By comparing on-site monitoring and numerical calculation data, the change trend of the wall horizontal displacement of the measured value and the simulated value is approximately the same. The measured maximum value of the monitoring section is 8.46mm, the simulated maximum value is 5.66mm, and the difference between the two is 2.8 mm, verified the rationality of the model, and provided some experience for the excavation of foundation pits to protect adjacent buildings.
Uniaxial Compression Properties of Marble with Crossed Double Fissures at Different Angles in Mineral Resource Exploration
Authors: Tang Lizhong , Tu Yihao 
Published: July 2021

Abstract
In order to study the effect of the two prefabricated crack angles of the prefabricated cross-shaped cracks on the peak stress, crack development and acoustic emission characteristics of the marble specimens under uniaxial compression, the uniaxial compression test and acoustic emission were carried out by using natural marble specimens to prefabricate the intersecting cracks at different angles. test. Experimental research shows that: (1) The strength of the prefabricated cracked specimen is significantly lower than that of the complete specimen, and the strength of the specimen decreases as the sum of the angles between the two cracks and the loading direction increases. When the sum of the angles is the same, the strength of the two cracks the greater the angle of the crack with the load direction, the lower the strength. (2) The test piece always cracks first at the end of the crack with a larger angle with the loading direction, and the through crack that leads to the final failure of the test piece is also gradually developed from the two ends of the crack. (3) The larger the angle between the two prefabricated cracks of the specimen and the load direction, the higher the accumulated acoustic emission energy, the higher the accumulated acoustic emission energy, and the lower the strength of the specimen.
The Design and Construction of Prefabricated Reinforced Truss Concrete Composite Plate in Soil Excavation Foundation
Authors: Xue Tianlang , Gu Chenglong 
Published: July 2021

Abstract
As one of the most commonly used forms of prefabricated floor slabs, steel-bars truss concrete composite slabs have been widely accepted in China in recent years. However, due to its application is still based on the use conditions of cast-in-place slabs, and most engineers and technicians are unfamiliar with the features and use methods of composite slabs, the application of it has numerous limits. This paper primarily focuses on the characteristics of steel truss concrete composite plate and the process of its design, fabrication and construction.
Analysis of Stress and Deformation and Stability of Grouting Wall and Mud Control in Tunnel Excavation
Authors: Wang Xuebin 
Published: July 2021

Abstract
To prevent the grout and fissure water from gushing out of the working face and to ensure the effective diffusion of grout along the fissure under the action of high grouting pressure, the grouting wall should be set up on the working face before grouting to ensure the grouting effect. This study found that under the grouting pressure of 4MPa, the grouting wall model with a thickness of 80cm is more stable than that with a thickness of 50cm. At the same time, for the grouting stop wall with a thickness of 80cm and a dip angle of 50°, both the horizontal deformation and the settlement of the vault have met the requirements of the construction specification in the process of simulated grouting calculation.
Construction technology of super high rise ultra-thin shear wall bearing heavy tonnage tower crane under energy saving and emission reduction
Authors: Zhao Ziwu , Li Shimin , Yu Ziqiang , Chen Jun , Li Yan , Zhang Qinxiong , Meng Zhaohu , Gao Peng , Chen Zhanxun , Wang Ning 
Published: July 2021

Abstract
Lanzhou·Famous City Plaza Project There are two internal climbing boom tower cranes in the core tube of 1# building. From the 50th floor, the thickness of shear wall is reduced to 200mm, and the design wall thickness and reinforcement can not meet the stress requirements of boom tower cranes. Through the finite element analysis software ANSYS simulation analysis, the core tube shear wall and coupling beam are strengthened, the reinforcement is increased, and the concrete strength grade is improved. At the same time, the steel beam of the boom tower crane is reinforced to reduce the load borne by the shear wall, and then the seamless steel pipe and jack are used to push back the load of the steel beam from the bottom, which solves the problem of insufficient bearing capacity of the ultra-thin shear wall to the boom tower crane, makes the boom tower crane work normally, and ensures the construction safety and the construction period.
Properties characterization of interfacial transition zone of recycled concrete for reducing the resource waste and environmental pollution
Authors: Zhang Yichao , Chen Xingyi , Liu Aixia , Zhou Jinghai 
Published: July 2021

Abstract
The extensive use of concrete results in a lot of resource waste and environmental pollution. More experts and scholars began to pay attention to the application of recycled concrete in construction engineering. The weak interface transition zone of recycled concrete is the fundamental reason for the deterioration of recycled concrete materials, components and structures. This paper summarizes the property and its characterization of interface transition zone of recycled concrete, which can improve the mechanical parameters such as elastic modulus and thickness of interface transition zone (ITZ) of recycled concrete. Through the nano-indentation technology and scanning electron microscope (SEM) technology can study the cracks in the interface transition zone of recycled concrete from micro to meso. The combination of the two technologies can make it easier to study the microstructure and mechanical properties interface transition zone of recycled concrete. It is concluded that elastic modulus of ITZ of recycled concrete is improved through adding fiber, slag, silica fume and other materials, and the thickness of that is decreased at the same time, which can strengthen the property of ITZ, which provides a better method for the study of the failure mechanism of recycled concrete.
Identification of preferential groundwater run-off belts through correlation between spring discharge and precipitation in Baiquan spring basin
Authors: Yu Yafei , Shu Longcang , Dong Yanan , Wang Xin 
Published: July 2021

Abstract
Baiquan spring group is a typical sign of the existence of preferential groundwater run-off belts in Baiquan spring basin. The spring flow is mainly affected by the supply of karst water, and atmospheric precipitation is the most important factor affecting the supply of karst water. By using Pearson correlation coefficient method, the number of months with the maximum Pearson coefficient between the spring discharge and the precipitation at the monthly scale of each hydrological station in the water spring area is analyzed, which is called the best precipitation delay. According to the optimal precipitation lag time, the Pearson correlation coefficients of spring discharge and precipitation of each hydrological station in 2006-2013 are calculated on the three months scale and the daily scale respectively, and the hydrological stations closely related to spring discharge are found out. The results show that: the best precipitation lag time of each station is 6 months; the precipitation change of Wangsheren station, Suncun station and Wenzu station is consistent with the spring flow process, which has a relatively large impact on the spring flow. The 3 stations may be located in the preferential groundwater run-off belts bearing medium in Baiquan spring basin.
Safety Science and Engineering Technology of Dust Control and Air Quality Improvement in Large Coal Mines
Authors: Liu Haixia , Lian Qingwang 
Published: July 2021

Abstract
The paper introduces a new type of large-scale coal mine dust monitoring and efficient treatment technology, which realizes online continuous monitoring and control of mine dust concentration, and can transmit the dust concentration at the detection point to the underground control system in real time, realizing intelligent coal mine dust management, When the dust concentration exceeds the set standard, the coal shearer and road header can automatically carry out high-pressure spraying to reduce dust. Compared with the traditional technology, the dust removal efficiency is increased by more than 80%.