Archive

31 March 2020, Volume 30 Issue 1 Previous Issue    Next Issue
---
Technology Theory and Application
Management Science Research
Basic Science Research Column
Education and Teaching Research


For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

Technology Theory and Application

Select

Correlation Analysis of Silty Soft Soil Index in Wuchang Area of Northeast China YE Chao-liang, MENG De-qiang, WANG Hai-qiang 2020, 30(1): 1-6.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.001 Abstract ( )   PDF (663KB) ( )   The geotechnical parameters have regional characteristics and it is of great practical value to study the correlation of physical and mechanical parameters.Based on the statistical analysis of physical and mechanical indexes of 95groups of silty soft soil in Wuchang area of northeast China.The following conclusions and suggestions are obtained.First，the silty soft soil has the characteristics of high water content，high compressibility，large pore ratio and low strength，but the range of physical and mechanical parameters is large，the coefficient of variation is high，and the average shear strength is slightly higher than the coastal silty soft soil.Second，natural density，dry density and natural water content are highly correlated logarithm.Third，natural moisture content，liquid limit and plastic limit are highly correlated with plastic index，liquid limit and plastic limit.Fourth，the pore ratio is highly correlated with natural moisture content，natural density and dry density，with linear and exponential relationships respectively，and has a significant logarithmic relationship with particle specific gravity.Fifth，compression modulus and compressibility are highly correlated with natural water content，natural density，dry density and pore ratio，which shows that these parameters have great influence on soil deformation.It was moderately correlated with particle specific gravity，but not with liquid index and saturation.However，there was no correlation between the shear strength parameters and the physical properties.Some valuable empirical formulas are obtained by fitting to provide reference and basis for parameter selection of silty soft soil in engineering design of Wuchang area. References | Related Articles | Metrics

Select

Displacement Analysis of Caisson-piles Composite Foundations ZHANG Kai, LIU Xu-kai, ZHOU Yan, GUAN Qing-hai, LI Zi-lin 2020, 30(1): 7-13.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.002 Abstract ( )   PDF (1101KB) ( )   According to the ratio of load distribution between pile foundation and caisson，the main and secondary stressed members are determined，and the simplified calculation model of caisson-piles composite foundation is established.Based on the mechanics balance condition of foundations，the calculation formula for caisson-piles composite foundation is derived.The strength failure limit state of the caisson-piles composite foundation is discussed.The influence of the soil creep effect to the composite foundation is analyzed.Based on the engineering examples，the different displacement of the foundation for the caisson and caisson-piles foundation are analyzed and compared.The results show that the horizontal displacement of the foundation can be reduced by about 20~30%and the rotation angle of the box can be reduced by about 35~45%compared with the caisson foundation.The soil properties behind the caisson-piles foundation significantly affect the displacement of the foundation.The soil in the back of the caisson gradually improves from the flow plastic state to the hard state，the horizontal displacement at the top of the foundation will be reduced by 50~70%，and the box angle will be reduced by 20~50%.The distribution relationship of the horizontal load for the caisson-piles composite foundation is related to the stiffness of the soil in the back of the caisson and the stiffness ratio of the pile foundation.The load shared by the back soil of the caisson increases with the increase of the stiffness of the back soil.Compared with the caisson foundation，the caisson-piles composite foundation can reduce the deformation of the foundation，but there is still a problem of insufficient bearing capacity of the soil behind the caisson，reinforcement measures should be taken to improve the performance of the soil and raise the bearing capacity of the soil，also further reduce the long-term and short-term deformation of the foundation. References | Related Articles | Metrics

Select

Dynamic Analysis of Vertical Vibratory Roller Based on Lumped Parameter Model BAI Fan, WANG Yang, LI Shao-hua, QIN Hao 2020, 30(1): 14-18.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.003 Abstract ( )   PDF (1920KB) ( )   Considering the surface irregularity of the soil，a 2Dlinear dynamic model of roller-soil system was established for the vibratory roller and well-compacted soil.The response of the frame and the drum was analyzed，and the influence of some parameters on the dynamic behavior of the roller is discussed based on parameters of a certain roller.The research shows that in order to provide high compaction force while ensuring operation comfort，the frequency of the excitation force should be close to the second-order natural frequency of the roller.Under certain conditions，the excitation of the soil surface could play a significant role for the system response，therefore the frequency of the surface excitation should be controlled within a reasonable range.For smooth operating conditions where the drum is in contact with the soil，the effect of surface excitation on the dynamic behavior of the roller can be ignored. References | Related Articles | Metrics

Select

Experimental Study on Piles with Ram-compacted Bearing Sphere for Large Bearing Capacity Based on Saturated Soft Soil Foundation ZHANG Pei-cheng, SUN Yu-wen, ZHANG Dian-shu, WANG Ji-zhong 2020, 30(1): 19-23.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.004 Abstract ( )   PDF (1131KB) ( )   In view of the characteristics of the soft soil foundation in the coastal area，which is soft in the upper part and hard in the lower part，this paper improves the traditional carrier pile technology to realize the purpose of completing the construction of large bearing capacity pile in the saturated soft soil foundation，and to solve the difficulties of pile feeding and pile forming when sending the large diameter and long length of prestressed concrete pipe pile，square pile and bamboo pile to pass through the relatively dense silt or silty sand layer.The length and bearing capacity of the pile are quite different，which cannot meet the design requirements.Through the field test of a specific project，a comparative study is carried out to achieve the expected effect of controllable pile formation，shortened pile length and meeting the requirements of large bearing capacity，which can provide certain technical guidance. References | Related Articles | Metrics

Select

Deformation Characteristics and Stability Analysis of Guanyintan Landslide WU Ya-zi, ZHU Jian-dong, LI Fu-de, LIU Wen-dong 2020, 30(1): 24-29.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.005 Abstract ( )   PDF (3421KB) ( )   In August 2010，Sichuan Province was hit by heavy rainstorms，and a large number of landslides formed under the action of heavy rainfall，among which was Guanyintan landslide.The landslide has been continuously deformed since the formation，posing agreat threat to the life and property safety of the people living at the toe of slope.Through engineering geological survey，it is found that the square of the landslide body is 81，000m3，which is a small bedding landslide.The plane shape of the landslide body is tongue-shaped.The surface of the landslide is obviously deformed.Seven broken line cracks were developed at the trailing edge，side wall and middle and rear parts of the landslide.In the natural，heavy rain and earthquake conditions，the typical section is selected to establish the calculation model.The stability of the landslide is calculated by SLOPE/W software.The results show that the safety factors of the landslide in natural and seismic conditions are 1.541and 1.072，respectively.Both are in stable states.Under heavy rain conditions，the safety factor of the landslide is 1.019，which is in an unstable state.Combined with process geological survey and stability calculation and analysis，the formation process of Guanyintan landslide can be summarized that air condition generated by slope excavation，together with agricultural production，which intensifies deformation，eventually lead to slope instability under the rainfall.Its geomechanical  mode is sliding and fracturing. References | Related Articles | Metrics

Select

Comparative Research on the Testing Standards Application of Static Load Test for Pile Foundation among China,America and India DING Wei, WANG Wei, NIE Qing-ke, ZHI Zheng-hua, LIU Peng 2020, 30(1): 30-33+73.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.006 Abstract ( )   PDF (221KB) ( )   According to test piles measured data of vertical static load test of a certain power plant in Bangladesh，Chinese，American and Indian standards are adopted to respectively determine the ultimate bearing capacity of pile foundation with comparative analysis.The results of research show that the value of vertical ultimate bearing capacity of pile foundation determined according to Davidson’s standard is about 85%of that determined by Chinese standard;the value of vertical ultimate bearing capacity of pile foundation determined according to Indian standard is about 105%~110%of that determined by Chinese standard.It is recommended that the vertical ultimate bearing capacity value of pile foundation should not exceed the value determined by Chinese standard in similar geological conditions，so as to achieve safe，applicable and economic effects.The determination results of horizontal ultimate bearing capacity of a single pile are consistent with American and Chinese standards;the allowable value of horizontal bearing capacity of pile foundation determined according to Indian standard is about 107%of that determined by Chinese standard.It is recommended that the horizontal ultimate bearing capacity value of pile foundation should not exceed the value determined by American and Chinese standards in similar geological conditions. References | Related Articles | Metrics

Select

Design Record of Foundation Pit Inner Bracing System of Nanwei Station of Shijiazhuang Urban Rail Transit Line 2 WANG Chang-ke, YANG Jin-lei, WU Wen-juan, SUN Hui-zhe, SONG Yang, MENG Si-yu 2020, 30(1): 34-40.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.007 Abstract ( )   In recent years，urban rail transit construction started in many cities，which has led to the emergence of super deep foundation pit and super large foundation pit.In Shijiazhuang area，the depth of subway foundation pits is generally between 15mand 25m，which are dangerous projects.In this paper，combined with the design of the supporting scheme of the deep foundation pit of Nanwei station of Shijiazhuang Metro Line 2，the design process is systematically introduced，and a reasonable construction scheme is put forward.The field monitoring data show that the design scheme is reasonable. References | Related Articles | Metrics

Select

Application of High Density Resistivity Method to Estimate the Development Scale of Karst Cave in a Certain Site JIANG Shi-lei, ZUO Shuai, ZHAO Feng-qi, JIN Yong-chao 2020, 30(1): 41-49.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.008 Abstract ( )   PDF (3346KB) ( )   High density resistivity method is often used to explore karst development.However，the problems in analyzing the exploration results make the conclusion unreliable and the location and size of karst caves cannot be accurately determined.According to the principle of the method and the summary of practical experience，some analytical methods through summarizing the practical experience are applied in the engineering practice and show good results. References | Related Articles | Metrics

Select

Research and Analysis on Data Sharing Technology of University Information System SUN Xiao-lei , FENG Tao, LI Peng, LI Ya-juan, ZHANG Jin-fang 2020, 30(1): 50-53.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.009 Abstract ( )   PDF (353KB) ( )   With the rapid development of information technology，many colleges and universities have introduced various information systems to assist scientific research，teaching，logistics services，student management and other management work，which largely improve the working efficiency.However，the information cannot be shared.In order to solve this problem，according to the actual situation of our school，the paper explores and studies data collection，data acquisition and data updating to solve the problem of isolated information and achieve data sharing. References | Related Articles | Metrics

Select

The Application of Multisim in the Teaching of “High Frequency Electronic Circuit” in Applied Undergraduate Universities WANG Yin-hua 2020, 30(1): 54-58.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.010 Abstract ( )   PDF (2504KB) ( )   Multisim is widely used in teaching.The application of multisim in high frequency electronic circuit teaching is introduced in this paper.The teaching practice has proved that the introduction of the circuit simulation analysis to the theory teaching can not only make the students understand the theoretical knowledge，but also stimulate the students to use the simulation software to design the circuit. References | Related Articles | Metrics

Management Science Research

Select

Reflections on the Development of Nanjing's Public Transport Under the New Situation LI Chen, HAN Xue 2020, 30(1): 59-62.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.011 Abstract ( )   PDF (173KB) ( )   Facing the promotion of urban function and increasing demand for high-quality travel service as well as the rapid popularization of internet travel mode，it is crucial to enhance the service quality of Nanjing’s public transport.Based on the analysis of the current situation，this article analyzes the shortcomings and problems in the system，puts forward strategies such as deepening the supply side structural reform，optimizing the details of travel elements，precise infrastructure delivery，intelligent management improvement，and defining the implementation path for improving the quality of public transport service in the new period. References | Related Articles | Metrics

Select

The Development Direction of Adult Education in Colleges and Universities:from the Perspective of Learners' Learning Needs GUO Yan-rui, SHEN Cheng-hong, YANG Mei-shuang 2020, 30(1): 63-66.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.012 Abstract ( )   PDF (189KB) ( )   Adult education is not only the main form of continuing education in colleges and universities，but also an indispensable part of lifelong education system.Its development is supported by national policies.At present，the state advocates the“learner-centered”educational concept.Therefore，satisfying learners＇learning needs will become the future development direction of adult education in colleges and universities.This paper conducts a questionnaire survey on the learning needs of adult learners in the hope that the survey conclusion can provide beneficial reference for the optimization of adult education in colleges and universities. References | Related Articles | Metrics

Basic Science Research Column

Select

Discrete Quasi-norm Equivalence Theorem of Two-dimensional H(div)and H(curl)Spaces to Their Trace Spaces HUO Zhi-xin, WANG Meng, WANG Yuan-yuan, KONG De-zhi 2020, 30(1): 67-73.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.013 Abstract ( )   PDF (1054KB) ( )   In this paper，the discrete harmonic extension theorem of the corresponding trace space H-1/2(∂Ω)into the two-dimensional H(div;Ω)and H(div;Ω)space is proved in detail，and the discrete quasinorm equivalence theorem of the two-dimensional H(div;Ω)and H(curl;Ω)space to the corresponding trace space H-1/2(∂Ω)is obtained，which plays an important role in theoretical analysis and the design of numerical calculation methods. References | Related Articles | Metrics

Education and Teaching Research

Select

The Research on Practice and Strategy of Branding Construction of College Student Activities——A Case Study in the School of Electrical Engineering of Hebei University of Water Resources and Electric Engineering 2020, 30(1): 74-77.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.014 Abstract ( )   PDF (166KB) ( )   References | Related Articles | Metrics

Select

The Analysis and Countermeasures of the Problems Existing in the Employment Market Development in Colleges 2020, 30(1): 78-80.  DOI: 10.16046/j.cnki.issn2096-5680.2020.01.015 Abstract ( )   PDF (131KB) ( )   References | Related Articles | Metrics