Time filter

Source Type

Wang Q.,Shandong University of Science and Technology | Wang Q.,Shandong Hualian Mining Co. | Lu R.,Shandong University of Science and Technology | Kong Y.,Shandong University of Science and Technology | And 2 more authors.
Open Materials Science Journal | Year: 2014

Tensile strength is an important indicator of the steel-plastic geogrid mechanical properties. Tensile strength directly affects the size of the steel geogrid security and stability in support of the project. Stretching through the indoor geogrid test for combinations of different sizes and different geogrid elongation rate, tensile strength of the geogrid were compared. The findings are as follows: (1)The size of the stretching rate has a significant effect on the tensile properties of steel-plastic geogrid. The strain is constant, the stretching rate, the lower the tensile strength of the geogrid; stretching rate is constant, the greater the strain Plastic geogrid, the greater the tensile strength;(2) Peak strain increases with extension rates decrease; higher tensile strength material to reduce the amplitude of the smaller; under the same conditions of stretch rate, the lower the tensile strength of the geogrid, the higher the peak strain;(3)Different effects under different specifications geogrid tensile rate, steel-plastic geogrid degree of influence by the stretching rate is less than the plastic geogrid. © Wang et al.


Wang Q.,Shandong University of Science and Technology | Wang Q.,Shandong University | Wang Q.,Shandong Hualian Mining Co. | Wen X.,Shandong University of Science and Technology | And 3 more authors.
Journal Wuhan University of Technology, Materials Science Edition | Year: 2014

By analyzing the grille mechanical property, tensile strength and creep tests, and the field tests, we investigated the characteristics and the reinforcement principle of multidirectional geogrid, and obtained the effect factors of grid characteristics, load and time curve and the shear stress of grille and sand interface. The reinforcement effect of geogrid in combination of typical project cases was illustrated and the following conclusions were presented. Firstly, multidirectional geogrid has ability to resist structural deformation, node distortion or soil slippage under stress, and can effectively disperse load. Secondly, with the increase of tensile rate, grille intensity increases and the creep value also increases with the increase of load. Thirdly, the frictional resistance balance between horizontal thrust of damaged zone and reinforced soil in stable region can avoid slope failure due to excessive lateral deformation. Fourthly, the multidirectional geogrid is able to withstand the vertical, horizontal and diagonal forces by combing them well with three-dimensional orientation, realizing the purpose of preventing soil erosion and slope reinforcement, which has a wide range of application and development in engineering field. © 2014 Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.


Wang Q.,Shandong University of Science and Technology | Wang Q.,CAS Wuhan Institute of Rock and Soil Mechanics | Wang Q.,Shandong Hualian Mining Co. | Wen X.,CAS Wuhan Institute of Rock and Soil Mechanics | And 2 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2013

Glass-plastic composite geogrid, high strength, impact toughness, resistance to environmental stress, creep resistance is strong, and in normal use to maintain long-term stable performance. Through the glass-plastic composite geogrid materials, technological process, the introduction of performance indicators, and Through field tensile test at different temperatures grille longitudinal and transverse rupture strength and fracture elongation were analyzed, get the following conclusions: (1) grille strip with fiber material that can resist erosion and climate change, to ensure the stability of its performance; (2) grille breaking strength was positively correlated with temperature, elongation with temperature negative correlation, and after a certain time to stabilize; (3) Structure using a special process to improve the grille peel tear strength and soil interlocking engagement capability, glass-plastic composite geogrid development in our country is in its infancy, as reinforcement, reinforcement will in the civil engineering field has broad market prospects.


Qingbiao W.,Shandong University of Science and Technology | Qingbiao W.,Shandong Hualian Mining Co. | Cong Z.,Shandong University of Science and Technology | Rongshan L.,Shandong University of Science and Technology | And 4 more authors.
Open Construction and Building Technology Journal | Year: 2015

In order to solve the problems of high springback of sprayed concrete and high dust concentration in the boltnetting support of underground engineering, research the mechanical properties of steel plastic geogrid and analyze the application of steel plastic geogrid replacing the metal net in the reduction of concrete through theoretical study, laboratory test, field test and contrast analysis, thus got the conclusion that: (1) Through the analysis of influence factors of the springback of surrounding rock supporting sprayed concrete, classification is carried on with the sampling survey method. The interaction between the metal net and concrete is the main factor to influence the springback of the concrete. (2) Study the performance differences of the steel plastic geogrid and the metal net. With the advantages of tensile strength, strong durability and injection connection, steel plastic geogrid has stronger applicability, safety and stability in adjusting the stress of the surrounding rock of the roadway and coordinating its deformation. (3)Through the tensile test and the deflection test, study the relationship between the tensile strength and external load under different aperture, thus establish the relation curve between the maximum deflection and load. (4) Through the roadway engineering construction and the analysis of the data of the field test, steel plastic geogrid can greatly reduce the springback of sprayed concrete which can guide the design and construction of underground bolt-netting support engineering. © Qingbiao et al.; Licensee Bentham Open.


Wang Q.-B.,Shandong University of Science and Technology | Wang Q.-B.,CAS Wuhan Institute of Rock and Soil Mechanics | Wang Q.-B.,Shandong Hualian Mining CO. | Zhang C.,Shandong University of Science and Technology | And 2 more authors.
Journal of Engineering Science and Technology Review | Year: 2013

Shanghai electromagnetic levitation train (maglev) is the first one that is constructed and operated commercially in the world. Many technological problems have to be tackled during its construction, and the most difficult problem in the civil engineering part is the making of prestressed track beam. It requires high precision because of its special function. The stretching control of the pre-tensioning force and the post-tensioning force in the making of prestressed track beam is most important during the construction. This paper introduces and analyses the technical features of vibrating wire sensors as well as the development, the research and the application of force sensor for pulling force measurement of anchor cable. © 2013 Kavala Institute of Technology.


Wang Q.-B.,Shandong University of Science and Technology | Wang Q.-B.,CAS Wuhan Institute of Rock and Soil Mechanics | Wang Q.-B.,Shandong Hualian Mining CO. | Shi Z.-Y.,Shandong University of Science and Technology | And 2 more authors.
Journal of Engineering Science and Technology Review | Year: 2013

Through the technological test of self-balanced testing method on big diameter rock-socketed piles of broadcasting centre building of Tai'an, this paper studies and analyzes the links of the balance position selection, the load cell production and installation, displacement sensor selection and installation, loading steps, stability conditions and determination of the bearing capacity in the process of self-balanced testing. And this paper summarizes key technology and engineering experience of self-balanced testing method of big diameter rock-socketed piles and, meanwhile, it also analyzes the difficult technical problems needed to be resolved urgently at present. Conclusion of the study has important significance to the popularization and application of self-balanced testing method and the similar projects. © 2013 Kavala Institute of Technology.


Wang Q.,Shandong University of Science and Technology | Wang Q.,CAS Wuhan Institute of Rock and Soil Mechanics | Wang Q.,Shandong Hualian Mining Co. | Jiang J.,Shandong University of Science and Technology | And 4 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

The influence of different excavation methods on strata and surrounding rocks of adjacent overlapping tunnels is studied; and the stress-strain laws and deformations of overlapping surrounding rocks and current tunnel linings are revealed, which provides a theoretical basis for the deformation control, support design and excavation optimization design of adjacent overlapping underground projects. Through the FLAC3D numerical simulation, the stress-strain laws and deformations of overlapping surrounding rocks and current tunnel linings and the plastic failure law of overlapping surrounding rocks under the bench method, CRD method and glass method are studied. The research results are as follows: (1) Different excavation methods have different effect degrees on excavation positions during the construction of overlapping tunnels, which reveals the deformation mechanism of current tunnel linings and the dangerous points of lining destruction. (2) According to the development of plastic zone of surrounding rock and tunnel lining deformation, we can obtain that the CRD method is better than glass method and bench method when new line tunnels are excavated; and the deformation control effect of tunnel bottom excavated with CRD method is the best. (3) The bench-CRD-bench method is the ideal scheme when new tunnels cross current tunnels. (4) With any excavation method, the tensile stress will be caused in vaults, skewbacks, straight sides and bottoms of current tunnel linings. Both the maximum and minimum principal stresses in the skewback are the maximum; and the skewback is most easily damaged.


Wang Q.,Shandong University of Science and Technology | Wang Q.,Shandong Hualian Mining CO. | Wang Q.,Tai'an Road Engineering Materials Co. | Zhang C.,Shandong University of Science and Technology | And 4 more authors.
Journal Wuhan University of Technology, Materials Science Edition | Year: 2015

Glass fiber reinforced plastics geogrid has a wide application in the field of soil reinforcement because of its high strength, good toughness, and resistance to environmental stress, creep resistance and strong stability. In order to get high-powered glass fiber reinforced plastics geogrid and its mechanical characteristics, the properties and physical mechanical index of geogrid have been got through the study of its raw material, production process and important quality index. The analysis and study have been made to the geogrid’s mechanical properties with loading speed, three-axial compression, temperature tensile test and FLAC3D numerical simulation, thus obtain the mechanical parameters of its displacement time curve, breaking strength and elongation at break. Some conclusions can be drawn as follows: (a) Using glass fiber materials, knurling and coated projection process, the fracture strength and corrosion resistance of geogrid are greatly improved and the interlocking bite capability of soil is enhanced. (b) The fracture strength of geogrid is related to temperature and loading rate. When the surrounding rock pressure is fixed, the strength and anti-deformation ability of reinforced soil are significantly enhanced with increasing reinforced layers. (c) The pullout test shows the positive correlation between geogrid displacement and action time. (d) As a new reinforced material, the glass fiber reinforced plastics geogrid is not mature enough in theoretical research and practical experience, so it has become an urgent problem both in theoretical study and practical innovation. © 2015, Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.


Wang Q.-B.,Shandong University of Science and Technology | Wang Q.-B.,Shandong Hualian Mining Co. | Zhang C.,Shandong University of Science and Technology | Wang H.,Shandong University of Science and Technology | And 4 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2014

The engineering accidents of anchorage failure often occur owing to the loss of anchorage force of prestressed anchor cable. Complicated coupling effect exists between the anchorage force loss of anchor cable and rock and soil creep. Theoretical foundation and technical means for the design, construction, safe operation management, the control and compensation technique of the loss of anchorage force is provided by building the coupling effect model and establishing the formula of the two. On the basis of common rheological model of rock and soil, coupling calculation model is established based on the equal strain and validated as well by means of theoretical analysis and model research. The findings are as follows: (1) The coupling effect model of anchor cable anchorage force change and rock and soil creep in line with the practical engineering is established. The relationship between the anchorage force loss of prestressed anchor cable and rock and soil creep is correctly reflected. The constitutive equation and relaxation equation and creep equation are deduced, and the calculable relationship between anchorage force change and rock and soil creep is solved theoretically. (2) With the creep equation of the coupling calculation model, the anchorage force loss of anchor cable caused by slope creep effect can be calculated when the material parameters are known. Comparatively analyzing the anchor cable stress data in the practical engineering, we can accurately understand and evaluate the abnormal changes of anchor cable anchorage force to guide the design and construction of practical engineering and ensure the safety of engineering construction process. (3) With the relaxation equation of coupling calculation model, the monitoring data of prestressed anchor cable stress state is arranged and analyzed. With the back analysis of the anchorage force loss data of anchor cable, the creep parameters of rock and soil are analyzed. The creep value of rock and soil according to the material characteristics of creep medium is calculated. The safety and reliability of prestressed anchor cable anchorage engineering are judged in accordance to the creep value to guide the safety operation management of anchorage engineering.


Wang Q.,CAS Wuhan Institute of Rock and Soil Mechanics | Wang Q.,Shandong University of Science and Technology | Wang Q.,Shandong Hualian Mining Co. | Jiang J.,Shandong University of Science and Technology | And 5 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

Outstanding anchor cable dynamometric system is urgently needed in anchor engineering of pre-stressed anchor cable so as to control tension during the process of anchor cable construction and monitor long-period variation of anchoring force. A breakthrough research has been made on the development of high performance anchor cable dynamometric system based on vibrating-wire sensor technology through theoretical research, laboratory study and field engineering experiment research. Here are the research results: (1) The newly-built mathematical model can improve the accuracy of vibrating-wire sensor and make error compensation for temperature. (2) The matching technique of string and operating diaphragm was adopted so that lag was decreased and accuracy of process was improved. (3) The low excitation circuit technology has been put into use that the inconformity of frequency was solved and the resolution of measuring instruments was enhanced. (4) The techniques of piston-conveying pressure and force conversion technology has been used to solve the vibrating-wire sensor problems of wide range, partial load effect, accuracy and long-term stability, which can be used to develop vibrating-wire sensors characterized with wide range, high-accuracy, high resolution and long-term stability. (5) Supporting detecting equipments, can directly display the physical quantity without additional errors but more accuracy. The newly developed anchor cable dynamometric system has achieved international leading level at aspects of accuracy, wide range, partial load, stability, reliability and environmental suitability that it can offer technical support for real-time monitoring of stress condition of pre-stressed anchor cable.

Loading Shandong Hualian Mining Co. collaborators
Loading Shandong Hualian Mining Co. collaborators