bluuebunny/crossref_metadata_2025 huggingface dataset:
Biology module based on ESQ effective to improve students’ evolution knowledge for high and medium academic ability level
Authors: Darussyamsu R , Fadilah M , Putri D H
Published: November 2019

Emotional and spiritual quotient (ESQ) reported as one factor that influence students’ achievement in learning. Therefore, integrating ESQ into particular topics of evolution learning material was one of our research focuses before. A biology module based on ESQ has been produced about evolution topic for grade XII students. This experimental study conducted to examine whether the module is effective or not to improve students’ knowledge about evolution. As sample, 190 grade XII students were taken with purposive sampling from three chosen schools in Padang, West Sumatera. Post-test only design using objective paper test applied with two variables; biology module as dependent and evolution knowledge as the independent. It analyzed statistically by using ANOVA and Mann Whitney test with p-value 0.05. There was a significant influence of students’ evolution knowledge in high and medium school at a significance level of 0.000 with F value 387.475 for SMAN 4 Padang and F value 63.727 for SMA Pertiwi 1 Padang. Meanwhile, for the lower school it influences did not significant based on Mann Whitney test asymptote Sig (2-tailed) 0.499. In conclusion, biology module based on ESQ about evolution topic is effective to use by students from high and medium ability.
The application of cooperative learning model type problem base learning (PBL) to increase the learning activities of students of class XII MIA 3 in SMA Negeri 1 Padang
Authors: Zulyusri  , Dana N R
Published: November 2019

This study is a classroom action research which aims to apply the Problem Based Learning (PBL) model as an effort to improve the learning activities of class XII MIA 3 SMA Negeri 1 Padang students. This research is conducted in two cycles on genetic substance material. Each cycle consists of four stages, namely planning, implementing, observing, and reflecting. The instrument used in this study is the student’s observation sheet as a form of reflection in each cycle. Six aspects that observed were working on the student’s worksheets, working together/discussing in groups, observing presentation activities, giving responses/questions, paying attention to teacher explanations, answering questions or giving opinions. The results showed that the learning activities of students through the application of the PBL model were classified as good category. This category based on an increase of student’s activities from the first cycle with an average achievement score of 60% (good category) to cycle II with an average achievement score of 76% (very good category).
PBLRQA strategy potential in enhancing metacognitive skills of students with different academic achievement
Authors: Bahri Arsad , Suryani Idris Irma , Nurman Rusdianto , Ristiana Evi
Published: November 2019

The learning strategy used in the lecture process is currently oriented towards mastering the concept, and has not attempted to empower students’ metacognitive skills. This research was a quasi-experimental study that aims to find out the influence of PBLRQA strategy on the metacognitive skills of students with different academic achievement in the study of animal physiology. This study used a pretest-posttest non-equivalent control group design. The sample of this study was the third year biology students as many as 115 people distributed in 4 groups. The experimental group was taught by using PBLRQA strategy and the control group was taught by traditional learning, each represented by two classes. Student cognitive retention is measured by essay questions. The research data were analyzed using descriptive and inferential statistics with two-ways covariate analysis (ANCOVA). The results showed that the score of metacognitive skills of students taught by PBLRQA increased by 55.23% from pretest to posttest, while those taught by traditional learning increased by 44.91%. The results of hypothesis testing showed that learning strategies, academic achievements, and interaction of both affect student metacognitive skills. The PBLRQA-upper academic achievement strategy’s metacognitive skills differ significantly by 18.65% from the PBLRQA-lower academic achievement, while conventional-upper academic achievement learning strategies differ significantly by 10.02% from the conventional-lower academic achievement. Based on the results of the study, it was concluded that PBLRQA strategy could empower students’ metacognitive skills with different academic achievement.
Investigating students’ preconception of some electromagnet topics
Authors: Suma Ketut , Wayan Sadia I , Made Pujani Ni , Ketut Rapi Ni
Published: November 2019

The objective of this study is to describe students’ preconception of some electromagnet topics. The data obtained using the Three Tier Electromagnet Test which consisted of 18 items. This test was given to 328 twelve-grade students of the public senior high school in Bali. According to the students’ response to the test, students’ preconception could be categorized as a scientific concept, misconceptions, lack of concept and error. The data were analyzed descriptively. The results showed that average of 14,58% of students has a scientific concept, 27.86% of students experience a misconception, 39,99% of students experience lack of concept and 17,53% of students experience an error. It can be concluded that students’ prior knowledge were very diverse. It is important to indentify students’ preconception on electromagnetic as a consideration for effective conceptual change strategy.
Students’ generated electron configurations of chemical elements: an explorative study
Authors: Sari M P , Hardinata A , Andromeda  , Bayharti
Published: November 2019

This study aimed to explore students’ understanding about electron configuration of chemical elements based on quantum mechanics atomic model. Sixty students from natural science education department participated in this study. A set of essay questions as was designed and validated through expert judgement and then was integrated into students’ final examinations for the Basic Inorganic Chemistry course within the academic year of 2017/2018. Data of students’ understanding were analyzed both qualitatively and quantitatively. The findings of this study revealed that most students made mistake in writing electron configuration especially when it comes to ions. Based on the analysis of the source of these mistakes, we provided recommendations to improve students’ understanding about this concept in the future learning.
Facilitation of democratic learning activities through mentoring
Authors: Warouw Zusje W M , Medellu Chris , Makahinda Tinneke , Runtu Vivian P J
Published: November 2019

Learning is basically the democratic process but unfortunately the study lacks the students’ diversity, so the academic atmosphere, the students’ body and collage progress are not optimal. The study patterns are still teacher centered unsustainable and lacking initiative. The learning material only emphasizes the concept that comes from the teaching book. Not optimizing the study program, it can also be reflected by the performance of alumni in the field. The performance of learning by the teacher (alumni) is not variable, generally in directional instruction manual. Teacher lacks experience and lack the ability to develop themselves in designing learning materials to utilize the environment around and learning from students’ activities. This study is directed to improve the academic climate to agreement that ultimately will contribute to independence and student learning initiative. The manner of learning is to apply the mentoring system conduct. The performance mechanism (group) USES the approach of the assessment and reflections. The results of the researcher: the performance of the play shows a significant difference between indicators. Indicators that shows the highest mentoring performance is indicator-1: building two-way communication with students. The construction of two-way communication between mentors with a group of students is easy to do by mentors, instead of other indicators like indikaor-4: conditioning the initiative to learn the initiative’s lesson with the relevant material. The difficulty of mentors in an indicator-4 achievement is to identify and design quickly the choice of relevant materials and according to the development of student groups. There were training and early preparation before the performance of the activity, but in the democratic process of learning the potential of problems, issues and new experiences with groups of students. Material is relevant to the problems that arise in learning process are not predictable. The performance of the performance for indicaor-6 was also low, but indicated the significant progress of the initial meeting to the end. Conclusion: the role of the mentors is very important in building communication and interaction with study in groups as well as the traffic of study groups and increasing the study of study and quality of the students’ work.
Teamwork among health sciences student in Universitas Sumatera Utara which exposed in interprofessional education (IPE) learning
Authors: Wahyuni A S , Ardinata D , Bukit E K , Purba J M , Anggraini D R , Widyawati T , Feriyawati L
Published: November 2019

The important issue that causes medical error is poor communication between professions in providing health services, ineffective teamwork collaboration, and unintegrated health services. The World Health Organization (WHO) triger the Interprofessional Education learning model as an integrated education system in health science students.The purpose of this study is to assess the teamwork formed after the IPE learning was applied to health science students at the professional level at the Universitas Sumatera Utara. Method. This research is a pre and post test design that was carried out by IPE learning in the area of Puskesmas Tuntungan Medan. The sample size is 20 students consisting of students from the faculty of medicine, nursing, pharmacy and public health at Universitas Sumatera Utara. The assessment of teamwork using the Team Work Score (TWS) questionnaire. Data analysis uses dependent t test.The results of this study indicate that the level of teamwork increases after IPE learning. There is a relationship between IPE learning and increased leadership skills, team structure, situation monitoring, group support, and communication (p<0.05). There is an increase in teamwork, after the application of IPE learning to health science students.
Current trends in TPACK research in science education: a systematic review of literature from 2011 to 2017
Authors: Setiawan H , Phillipson S , Sudarmin  , Isnaeni W
Published: November 2019

This paper reviews the research published from 2011 to 2017 that focuses on the characteristics and emerging topics on Technological Pedagogical Content Knowledge (TPACK) in Science education. A systematic search of the relevant research was undertaken of electronic databases including ERIC and Scopus using several key terms. Focussing on peer-reviewed journal articles, the screening process began with a perusal of the title and abstract, followed by the analysis of the purpose, method, findings, discussion and conclusion. The results showed that most of the research used pre-service teachers as the participants (56%). One-third used in-service teachers (31%) or both of them (13%). Furthermore, our results showed that the majority of studies use general science context (69%). Fewer studies focussed on specific subject domains, including biology (13%), Chemistry (19%), and Physics (6%). Based on the analysis of the current research, we found five key emerging trends, including the identification of teachers’ TPACK (100%), the relationship between TPACK and other components of technology integration (19%), strategies to developing preservice teachers TPACK (50%), how teacher implement TPACK (44%), and developing an instrument for TPACK (19%). Based on the analysis, we suggest some topics that need further investigation.
Establishment of an analysis model for the influence of seismic liquefaction site position change on seismic performance of metro stations
Authors: Qiao Xie , Hui Long , Lin Yan , Shuwen Liu
Published: November 2019

In recent years, the construction of subway projects has flourished, and the flow of personnel in underground structures such as subway stations has also increased. Once earthquakes occur, they will bring a series of unpredictable and malignant effects to the country. Therefore, it is necessary to strengthen the subway stations, etc. Research on earthquake resistance of underground structures. According to the research on the earthquake damage that has occurred, it is found that the underground structure damage such as the subway station is caused by the liquefaction caused by the earthquake. Based on the powerful functions of ABAQUS in solving nonlinear problems, this project establishes a two-dimensional liquefiable field-metro station finite element analysis model. The subway station form mainly adopts the commonly used two-story double-span island metro station structure. Based on the open secondary development port of ABAQUS embeds a sand constitutive subroutine that can describe the nonlinear characteristics of sand liquefaction dynamics, which provides a reference for a certain degree of reference for the difference of seismic response of metro stations in the future.
Application of spatial lateral constrained loading feedback control method in pseudo-static testing
Authors: Tian Zhen , Shi Pengfei , Sun Jianyun , Luo Ye , Zhao Yongxi , Zhai Minghui , Qi Hu , Liu Kang
Published: November 2019

In seismic performance testing of structures, the accurate boundary condition is the key to guarantee the accuracy of testing results. The one-way pseudo-static testing is the most common loading method in civil engineering seismic testing. However, the structures are all spatial structures in practice, therefore, the lateral constraints on specimen are necessary in one-way pseudo-static testing. The reaction devices are used to constrain the specimen laterally in traditional loading method, but the traditional loading method has some disadvantages such as high cost, large occupation of space and so on. In order to avoid those disadvantages of traditional loading method, a spatial lateral constrained loading feedback control method is proposed in this paper. In this method, the main direction loading and lateral constrain of the specimen are realized by the actuators, and the accurate control of the constraint boundary can be achieved by adjusting the position of the lateral constrained actuators. In order to verify the accuracy and feasibility of the proposed method, a pseudo-static testing of a full-scale two-story three-span single concrete frame is conducted. The experimental results show that the proposed method is reliable, and the experiment accuracy can be guaranteed.
Study of the section optimization of gravity dam based on improved PSO
Authors: Si Zheng , Yang Kai , Huang Lingzhi
Published: November 2019

As the linearly-decreasing inertia weight of particle swarm optimization (PSO) can easily lead to local extremum, this paper proposes an improved PSO which changes the dynamic changing pattern of Inertia Weight w based on the properties of trigonometric function. The inertia weight value of improved PSO is large at the early stage and relatively small at the later stage, thus improving the global searching ability as well as the convergence performance of the algorithm. The Optimal Section Area A(X) of non-overflow gravity dam calculated through improved PSO is 5147.3 m2 which is 6.93% lower than that calculated through SPSO (A(X)=5530.7m2). To obtain the optimal solution, the calculation steps needed by improved PSO and SPSO respectively are 15 and 22. The convergence rate of improved PSO is 31.8% higher than that of SPSO. The calculation results of the two algorithms show that the improved PSO is able to obtain better optimization results in higher convergence rate and thus is suitable for the optimization design of large-scale hydraulic structures.
Establishment and application of an evaluation system for the sustainable development of subway traffic
Authors: Geng Dong-Yang , Vojtasik Karel
Published: November 2019

According to the characteristics of the sustainable development of subway traffic, the establishment process of an evaluation index system is determined, and the evaluation method and basis are defined. The evaluation index system is established from the aspects of subway traffic sustainability, economic sustainability and urban coordination sustainability. The comprehensive evaluation method of the analytic hierarchy process (AHP) model is used to calculate the weights of comprehensive evaluation indexes at each level. Finally, the sustainable development model of Shijiazhuang subway traffic is evaluated. The results show that the proposed evaluation system and model reflect the degree of sustainable development of subway traffic and can be used for reference in the evaluation of regional subway traffic sustainable development.
A study for Application Research of “Regional” Architectural Culture in Architectural Design Courses
Authors: Guifen Lyu , Yu-Che Huang , Bei Shang
Published: November 2019

Under the impact of the globalization culture, the city’s style looks like the same in many cities in China. It has caused the reflection of the architects and hopes to integrate regional culture into the architectural design. This article takes the design topic “Pedestrian Commercial Street Design” in architectural design teaching as an example. By comparing the learning effects of students before and after study, it provides practice and reflection for regional architecture design. Firstly, it reviews and discusses the development of Yinchuan regional architecture and regional theory as the basis of teaching process. Secondly, through the practical operation of design teaching, students are guided to complete relevant design content. Finally, through the questionnaire survey on the learning effect before and after the students’ study, the students’ regional academic operation results are summarized. By reflecting on the concept of regional architecture in the process of design teaching, the author tries to put forward some suggestions on the development of regional architecture.
A Study on the Insulation Effect of the Roof Greening Overhead Structure in Hot-moist Regions
Authors: Jin Xueli , Hu Yongping , Zhou Guiting , Huang Zhilu , Li Rongying , Meng Qinglin
Published: November 2019

The climate in hot-moist regions like Guangdong is characterized as short in summer and long in winter, which imposes high insulation requirements on the roof of houses. In this case, this paper proposes a roof greening overhead structure, which is developed by making a bracket under the existing planting box after reinforcing the bottom thereof, thus there will be an overhead layer with a height of 300mm between the planting box and the roof. The study used three office rooms with identical conditions on the top floor of the office building as the test rooms. The roofs of the three rooms were set as the roof with the overhead planting box, the roof with the existing planting box and the reference roof, respectively. The temperatures of the structural layers in the three test rooms were measured under the non-air-conditioning closed conditions in summer. The hourly power consumptions of the air-conditioners in the three test rooms were measured under the air-conditioning closed conditions in summer. The results indicates the natural ventilation formed by the overhead structural layer can improve the overall insulation effect of the roof. The energy saving rates of the air conditioners in the room with the overhead planting box on the roof reached 28.2%.
Ultimate Bearing Capacities of Concrete Filled Hybrid Composite Tubular Short Columns
Authors: Su Jiazhan , Zhou Lanjian , Wu Hwaichung , Chen Baochun
Published: November 2019

The new reinforcement material, Hybrid Composite (HC), is new innovative material and made of carbon fiber or other fibers in the form of tubular weave or braid. HC tubes has been used in column and pier to restrict the lateral expansion of concrete to improve the compression performance, while protecting the column as well. In this paper, the mechanical behavior of HC reinforced concrete short columns under axial and eccentric compression loading is analyzed. By testing the model and analysis the result using finite element software ABAQUS, the displacement, and load capacity of all specimens are collected and analyzed in terms of the number of HC layers and eccentricity ratios. The results show that the ultimate load capacity of columns increases with the number of HC layers under axial compression, and the ductility of the reinforced columns was significantly improved by HC reinforcement, compared with plain concrete columns.
Application of cantilever roadheader in tunnel construction
Authors: Xia Zhao , Junying Rao , Chengshan Cheng , Caijin Xie
Published: November 2019

Cantilever roadheader is widely used in coal roadway engineering, but it is rarely used in urban subway tunnels. The underground boring tunnel in Guiyang City is selected as the object. The background and purpose of the cantilever roadheader, the construction technology and method, the advantages and disadvantages analysis and the construction optimization are selected to study its application in the underground karst tunnel. Studies have shown that the use of cantilever type roadheader can speed up construction progress, reduce surrounding rock disturbances, reduce safety risks and improve excavation quality, which is unmatched by traditional drilling and blasting construction.
Study on Tunnel Risk Assessment Based on Rough Set and Grey Theory
Authors: Wu Xuling , Pan Jierui , Liao Yuxuan , Zhou Ying
Published: November 2019

The surrounding environment of railway tunnel engineering is complex, and it is prone to major safety accidents. It is necessary to adopt feasible and accurate evaluation methods. The evaluation index system of tunnel is established. Rough set is used to quantify the evaluation index and form the reference index. The risk evaluation model of tunnel based on rough set and grey is established, and the risk of Sheguchong tunnel in Yunnan Province is validated to evaluate the validity of the model.
Simulation Study of Window Size on Indoor Lighting of Old-age Buildings
Authors: Wu Mengyun , Jiang Shuguang , Li Jie , Dai Jin , Xu Xin
Published: November 2019

With the rapid development of China’s society, the aging of the population has gradually developed into a hot issue of society. The degree of aging has intensified. The old-age environment of the elderly has gradually become the focus of social attention, and the natural light environment is an important part of the old-age environment. Its role can not be ignored. Based on the light and climate characteristics of the severe cold regions of Xinjiang, this paper uses the light environment simulation software Ecotect to analyze the influence of window-to-wall ratio and window height on the interior lighting of the building, and improve the indoor light environment of the building by changing the size of the window and the height of the window sill. Further suggestions are proposed to improve the light environment of the nursing home.
Importance of seismic hydrodynamic pressure for design of bridge pier in deep water from a numerical case study
Authors: Liu Haiming , Tao Xiaxin , Tao Zhengru , Zhang Shiwang
Published: November 2019

The importance to take into account the hydrodynamic pressure on bridge pier in deep water for seismic design is deal with in this paper from a numerical case study. In that study, a bridge pier in 54 m water is modeled as single pier, the interaction between soil-pile foundation system and pier is expressed by springs from M method and mechanical analysis, that between water and the pier is by added mass and damping of moving water from Morison equation. Seismic responses of the model in conditions with 6 water depths and without water are calculated respectively, with inputs of 12 ground motions for 4 fortification intensities. The maximum values of shear forces at the bottom of the pier are acquired from the corresponding response time histories, and compared with those without water. The result shows that the effect of the hydrodynamic pressure must be taken into account in design of bridge in deep water as it may be even larger than that of strong ground motion if water depth is larger than 50 m.
Preliminary seismic vulnerability matrix related with fortification intensity for Sichuan region
Authors: Tao Xiaxin , Tao Zhengru , Kang Mengya , Zheng Guangfen
Published: November 2019

The significance to develop fortification intensity related vulnerability matrix for earthquake prevention and mitigation is emphasized in this paper. The way to acquire the fortification intensity data of buildings damaged in the great Wenchuan earthquake, from their construction years with the seismic zoning maps in three time periods, is reported. Preliminary statistical results of vulnerability matrices related with fortification intensity VI, VII and VIII, are presented for brick-concrete structure and frame structure buildings in Sichuan region. The results show clearly the decrease of vulnerability with increase of the fortification level.
Research on the Causes and Prevention of Airport Pavement Diseases
Authors: Feng Xinpu , Guo Lei , Ren Geng , Liu Shaoning
Published: November 2019

The structure of airport runway has changed the balance of water movement between the original surface and the atmosphere, resulting in the accumulation of water under the base of airport runway surface, forming a “pot-cover effect”, aggravating the uneven settlement of the foundation under aircraft load, resulting in the destruction of the structure of the runway surface, frequent diseases, and seriously affecting the airworthiness of the runway. In order to solve the problem of water enrichment under the base of the runway surface, this paper proposes a specific layout scheme of diversion canals. In the runway overhaul project of Shenyang Taoxian International Airport, the water diversion canal was excavated on the spot, and it was found that the water level at the site was comparatively consistent with the water level at the scheme analysis. The layout scheme of the water diversion canal was reasonable and effective, and could well solve the problem of “pot-cover effect”.
Study on the technique of single-layer initial arch cover method in Hongyan Village Station
Authors: Zaifeng Yao , Xiaohong Guo
Published: November 2019

Aiming at the geological characteristics of the upper soft and hard stratum in Chongqing area, taking the Hongyan Village Station of Metro Line 9 as an example, the excavation method of super-large section single-layer initial arch cover method is proposed. The finite element numerical simulation is used to analyze the horizontal and vertical displacement of the surrounding rock, the axial force and bending moment of the single-layer initial arch cover, and the axial force distribution of the anchor. It is concluded that the single-layer initial arch cover method can meet the control requirements of deformation and surface settlement of super-large section surrounding rock. The initial arch cover of H220 grill steel frame + φ25, L=4.5m hollow grouting anchor + 300mm thick C25 wet-sprayed concrete can meet the bearing capacity requirements and ensure the overall stability of the structure. The connection mode of the large arch and the side wall arch is optimized to ensure that the initial branch is completely closed and looped. Combined with on-site monitoring and measurement data, it is feasible to use a single-layer initial arch cover method at Hongyan Village Station.
Computational Investigation on the Seismic Performance of Self-Centering Tension-Only Braced Frames
Authors: Chi Pei , Tian Wenlong
Published: November 2019

The self-centering tension-only brace (SC-TOB) is a new type of flexible bracing system that provides both energy dissipation and re-centering capacities to the structure. In this paper, a computational investigation on the seismic performance of steel frames with SC-TOBs is conducted. Two main parameters, including the stiffness degradation factor and the activation strain of the SC-TOB, are investigated through pushover analysis. The results indicate that increasing the stiffness degradation factor leads to a larger second stiffness of the SC-TOB frames (SC-TOBFs), which is beneficial to make the distribution of drifts more uniform over the building height; the activation strain has a significant impact on the activation deformation of SC-TOBFs, but a slight effect on the distribution of drifts. The SC-TOBFs is deemed as a type of performance-tunable structure, which can be achieved by varying a frame’s adjustable design parameters.
Planar Distribution Model of Airport Pavement Traffic Volume
Authors: Shi Xingang , Cai Liangcai , Wang Guanhu , Zhang Duoyao , Meng Chaomei , Wu Aihong
Published: November 2019

The current specification of airport pavement design and evaluation had seldom pointed out the longitudinal distribution of airport pavement traffic volume (APTV) except the wheel offset at the edge or the central section of the runway. In this study, the characteristics of APTV were pointed out, which revealed that every point of the pavement had a different traffic volume. Then using the longitudinal traffic factors, the planar distribution model was established. At last, influence factors of APTV including take-off probability ratio at one side, runway length, take-off running distance and lateral distribution were analyzed. Examples and analysis showed that only considering the lateral distribution of APTV would make the pavement design more conservative.
Research on Force Design of Concrete Filled Steel Tube Structure with Open Hole and Stiffener
Authors: Tang Peng , Cheng Gao
Published: November 2019

The built-in open-hole type stiffened rectangular steel tube concrete refers to a new combined structure formed by forming an open-hole steel plate in the longitudinal direction of the inner wall of the steel pipe and then filling the concrete. In order to study the function of the built-in open-hole stiffened joints, the design of the stiffened rectangular steel tube concrete was designed to analyze the influence of the mechanical properties of the steel-mixed interface. The results show that the vertical rib opening is formed, and the bearing capacity of the rectangular steel tube concrete interface is increased by 2.06 times under the limit state. The shear stiffness and shear capacity of the interface are improved by more than 4 times under normal use.
Analysis on the Stability of double-fastener type Tubular Scaffold
Authors: Su Liya , Fu Liping
Published: November 2019

The fastener type scaffold has the advantages of dismounting convenience, wide universality and good integral rigidity, which can bring convenience for construction. In this paper, the finite element software ANSYS10.0 has been used to construct a semi-rigid tubular scaffold model, on which certain concentrated load has been applied for numerical analysis. This paper mainly studies the effect of steel-tube thickness and the arrangement of connecting tubes on the stability of scaffold, so provide a theoretical basis for the practical construction and design of scaffold, and to reduce the incidence of accidents.
Study on mechanics damage mechanism of arch surround reinforced structure under loose load
Authors: Liu Xue-zeng , Lai Hao-ran , Sang Yun-long , Zhang Yu-hui
Published: November 2019

Lining crack is a typical disease of highway tunnels in operation, which affects the long-term operation safety of tunnels. The arch surround is suitable for strengthening tunnel projects with serious cracks due to its characteristics of significantly increasing structural bearing capacity and prolonging service life. However, at present, the damage evolution mechanism of arch surround reinforcement structures under loose loads based on the secondary stress mode is not well understood. Aiming at the above problems, in this paper, based on the load structure method, indoor 1:10 model test of arch surround reinforcement for Grade VI surrounding rock and damaged lining structure is carried out and the stress and deformation law, failure mode and ultimate bearing capacity of tunnel after arch surround reinforcement is explored. On this basis, finite element software is used to simulate the whole process of damage evolution of arch surround reinforced the structure, and to explore the mechanism of mechanical damage evolution of arch surround structure after reinforcement. The results show that the arch surround reinforcement can effectively repair the damaged tunnel and greatly improve its bearing capacity. When the residual bearing capacity of lining is 48.4%, the bearing capacity is increased by 164%. The original structure of the second lining and the reinforced structure of the arch surround are both in large eccentric compression failure. The main damaged parts are the vault and the haunch. The failure of the reinforcing structure of the arch surround is caused by the slip cracking of the combined surface between the second lining and the arch surround. Anchor bolts should be added to improve the shear bearing capacity of the combined surface.
Deformation mechanism of mining roadway and establishment of its mechanical model
Authors: Jing Suolin , Jiang Pengfei , Huang Gang , He Xue , Zhang Jingkai
Published: November 2019

Accurately understanding of the strata behaviors law and stability characteristics of the mining roadway is the basics of effective surrounding rock control, and the structural characteristics of the surrounding rock is the decisive factor for large deformation of that in mining roadways. In this paper, the surrounding rock structure characteristics of mining roadway in different conditions were discussed and mechanical model was established accordingly. And the deformation characteristics of the material were simulated by the combined model of deformation elements, and the theory of the surrounding rock deformation in the mining roadway with time was obtained.
Risk assessment research on the application of improved analytic hierarchy process in building foundation pit based on fault tree model
Authors: Wen Zhang Zheng , Yan Liu
Published: November 2019

Foundation pit engineering plays an important role in infrastructure construction, but the collapse of support structure of the foundation pit often occurs. This paper takes the structural importance in the fault tree as the basis of the analytic hierarchy judgment matrix, pointing out that the construction process planning is the most important for the foundation pit engineering. The improved analytic hierarchy process (AHP) helps to reduce subjectivity, which is used to conduct the risk assessment of the collapse of the support structure of the foundation pit. In this way, this paper provides reference for the risk evaluation of the foundation pit engineering.
Study on reasonable width of coal pillar near the edge of panel based on prevention and control of rock burst
Authors: Yan-liang Wang , zhen-pei Zhang , Ya-dong Dong , Gang Han
Published: November 2019

The reservation of the coal pillar with reasonable width is the key to ensuring safe recovery of mining areas and working faces along the goaf. This paper studies the reasonable width of the coal pillar in the south wing of the 302 and the 301 panels by taking a mine in the Mengshan Base as an example, using theoretical research, numerical simulation and on-site measurement analysis. The three-zone theory is adopted to estimate the lateral bearing pressure of the goaf, showing that the width of the low stress zone is not less than 83 meters. The results of numerical simulation analysis show that the 20-meter coal pillar between the 1# and 2# ventilation roadways of the 201 working face has a high stress concentration, thus unable to meet the requirements for arranging small coal pillars. The high stress zone is concentrated within the lateral range of 90 meters. The micro-seismic data analysis shows that the micro-seismic accidents during the recovery of 202 working face are concentrated within the lateral direction of 80 meters. With the resource recovery and the impact of rock burst disaster prevention and control taken into consideration, this paper sets the reasonable width of the boundary coal pillar of the 302 panel to be no less than 85 meters.
Analysis of the Dynamic Impact of Intangible Assets on Capital Structure of Listed Companies in the Construction Industry
Authors: Duan Yinying , Wang Ruonan , Zhou Wei
Published: November 2019

Due to the leverage effect, appropriate liabilities can reduce the cost of capital, while intangible assets can cause changes in the asset-liability ratio. In order to further study the relationship between the two, this research selected the empirical data of listed construction companies that could potentially yield adequate findings, and used the distributed-lag model and WLS model for an empirical analysis. The research results show that there is a significant positive correlation between the asset-liability ratio and intangible asset ratio, the book value of intangible assets and internal structure of intangible assets, but the impact is slightly less than the asset profit rate. Despite this, the additive effect between the above-mentioned variables is still considerable. In the context of enhancing a company’s leveraged operations, a company’s management is suggested to adopt corresponding improvement measures and systems to deal with operational risks.
Response Analysis of Excavation of Deep Foundation Pit in Metro Station of Soft Soil
Authors: Wu Bo , Peng Yiyong , Lan Yangbin , Meng Guowang
Published: November 2019

Based on a deep foundation pit engineering of subway station in Ningbo soft soil area, the whole process of excavation of deep foundation pit engineering is carried out by PLAXIS finite element software and comparative analysis with field monitoring data based on HS soil hardening model. The analytical results indicates that the numerical simulation results can be well fitted to the field monitoring data. It is proved that the PLAXIS HS model can well complete the numerical simulation analysis of complex foundation pit excavation in soft soil area. From the Monitoring data and calculated values, the horizontal displacement of the grounding wall and surface settlement caused by the excavation of the auxiliary foundation pit are small, which has little effect on the main foundation pit. It is proved that the foundation pit support mode and construction method used in this project can well control the influence of the excavation of the auxiliary foundation pit on the main foundation pit.
Classification and Application of Surrounding Rock Stability of Straight Wall Semi-circular Arch Roadway
Authors: Kong Xiang-song , Wang Shuan , Fang Jie , Zhang Hao-chen , Hao Xiao-lin , Xu Zhuang-zhuang
Published: November 2019

The stability of roadway surrounding rock plays an important role in the safety of roadway, so the classification of roadway stability becomes an indispensable part in the safety analysis of coal roadway. Based on the statistical analysis of 25 relevant literatures and the principle of index selection, 12 classification indexes were determined by comprehensive analysis. A genetic neural network model was established. Data of 12 straight wall semi-circular arch roadways were investigated as training samples, and 4 roadways were selected for testing. The prediction accuracy of the model is 100%. Combining with the theory of strong support for coal roadway sidewall and angle, the stability classification model is applied to the classification of surrounding rock stability of straight wall semi-circular arch roadway, and reasonable supporting countermeasures and suggestions for different grades of surrounding rock are given. In order to verify the reliability of the model, the model has been applied in engineering, and achieved good results. It proves that the model has goodfit and strong applicability.
Numerical Evaluation of Tunnel Stability with Two-line Excavation by Plaxis3D
Authors: Xu Binbin
Published: November 2019

Before the excavation of the tunnel, it is very necessary to evaluate the stability of the tunnel especially for the ultra-long broken zone. The CD method and the three-step method are the potential construction method. The calculation parameters are simplified to improve the calculation efficiency and precision. The results show that the CD method can decrease the deformation of the enclosing rock significantly. During the practical excavation construction, CD method can be used when the tunnel is excavated at the initial stage.
Research of Advanced Geological Prediction in Tunnel Excavation with Ultra-long Broken Zone
Authors: Xu Binbin
Published: November 2019

The advanced geological prediction is carried out by using ground penetrating radar, infrared water exploration and seismic reflection method (TSP) for the shallow fractured zone of Laoyingshan tunnel. The prediction accuracy is over 95%. It is suggested that the advanced prediction method can be used in the follow-up similar tunnel projects to improve the information level of tunnel construction and ensure the quality and safety of the project.
Research on deformed slope parameters inversion based on equivalent conversion of soil pressure and application
Authors: Di Shengjie , Zhou Heng , Zhang Ying , Huang Peng
Published: November 2019

In this paper, a structural surface parameter inversion method for equivalent conversion of soil pressure is proposed. It can avoid the adverse effects of low overburden parameters, most dangerous sliding surface and relatively concentrated deformation limited to the overburden location. On this basis, we obtain the real inverse shear strength parameters of the deformation control structural surface. It can provide a reliable basis for evaluating the whole stability and protecting design of deformed slope. This paper analyzes and compares two kinds of supporting schemes for the deformed slope. The stability meets the requirements. In the actual situation, the design schemes can be selected according to the execution conditions, excavation and support sequence, and economic conditions
Study on the Ecological Landscape Design of Yawei Creek Wetland Based on LID
Authors: Liang Mingjie , Wang Haocheng
Published: November 2019

In recent years, many cities in China have built sponge cities to cope with the flood disaster faced, and Hainan province has taken the lead in carrying out the “ecological restoration and urban repair” urban double repair pilot work. Based on the LID strategy, take the wetland landscape design of Yawei Creek in Haikou city as an example, wetland landscape ecological design strategies are introduced, including landscape design for water transmission, river channel design, plant planting design and road system design. This paper analyses methods and discusses the urban rain flood management approach, to improve the management level of urban rainwater and provide a good reference for the construction of ecological landscape with regional characteristics in Hainan province.
The Analysis of Heavy Vehicle on Asphalt Pavement Service life based on Axle-mounted Traffic Volume Survey
Authors: Jia Li , Guijiao Ren , Zhide Dong , Chao Sun
Published: November 2019

Based on the surveied data of the G202 Heihe to Dalian on the Beisanjia station in Fushun City, Liaoning Province, the traffic conditions of the observation section of the station are analyzed. The continuous data is compared with the axle-load survey data, and the service life of the asphalt pavement in the year of data is analyzed. In order to make full use of real-time axle load-traffic survey data and accurately predict the remaining service life of asphalt pavement in an accurate and real-time manner, it is of great value to develop targeted asphalt pavement maintenance and protection countermeasures.
Study on the Method of Determining the Early Warning Level of Supply and Demand of Water Resources in Middle and Short Terms
Authors: Li Qifeng , Chen Xin , Wang Lei , Wen Jinhua
Published: November 2019

Taking the situation of water resources supply and demand at the regional short-term scale as the object of early warning, this paper puts forward the early warning index system of regional water resources supply and demand, clearly divides the early warning level of regional water resources supply and demand into three levels, and puts forward the determination methods of different early warning level standards, which provides support for the realization of early warning of regional water resources supply and demand. Yueqing City of the Wenzhou City was selected as a typical area for application research, and different levels of early warning standards were defined.
Flood hazard monitoring and analysis of mountainous riverside country - a case study in Xianfeng, Hubei, China
Authors: Li Zhe
Published: November 2019

Riverside towns are the weakness of flood control and disaster reduction system in China. Flood analysis of riverside towns based on hydraulic model is of great significance to the monitoring and early warning of mountain flood disasters. The paper starts with river system distribution and flood source analysis in case study of Xianfeng County, Hubei Province, China. And a flood calculation program is then proposed. On the basis of TUFLOW software, a one-dimensional hydraulics model is constructed, which is applied to calculate river flood evolution and diffuse embankment process under the designed flood conditions of 0.01, 0.02, 0.05, 0.10 and 0.20 (probability). The comprehensive information of flood range, submerged area and water depth is also retrieved, which is used to calculate flood hazard assessment and mapping. Results reveal that the main parts of Zhongjian River basically meet the flood prevention standard of 0.05 (probability) in Xianfeng County, while the middle-lower section of Taipinggou Valley has lower flood prevention ability. Moreover, this fact proves that the proposed one-dimensional hydraulics flood model is effective.
A brief review of research on steam condensation heat transfer based on separate effect experiments and diffusion layer theory
Authors: Wang Jue , Wang Ruo-nan , Tang Qing-song , Zhang Xiao-hui , Li Yao
Published: November 2019

Research on steam condensation in the presence of non-condensable gas is needed to support the thermal design of containment and capacity analysis of its cooling systems for nuclear power plants (NPPs). Based on classical and newly published literatures in related fields, the theoretical and experimental achievements are analyzed in this paper and research emphasis is consequently summarized. Considering the design and application characteristics of small-sized NPPs, several prospects of following-up study are proposed, which can be referenced in future work.