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Yu Y.,China Building Material Test and Certification Group Co. | Sun T.,China Jingye Engineering Co.
Key Engineering Materials | Year: 2017

As the integrant construction material for infrastructure construction and real estate industry, building waterproof materials is a key part of the construction quality guarantee. It plays an important role in saving energy, reducing consumption and environmental protection. It lays the foundation for the realization of the cleaning production and high efficiency for economical production. Currently, the direction of waterproof construction is from multi-layer to single layer, from heat to cold construction. There are many different kinds of waterproof materials on building materials market. When the waterproof materials need to be used for the project, we should deal with problems case by case in order to be able to select the waterproof coating suitable for the characteristics of the project. Attention need to be paid for the differences of the constituents, the physical, mechanical properties and characteristics, and construction points and matters during construction works polymer-modified cement waterproofing coating and cementitious capillary crystalline waterproofing materials are reviewed in the present study. Waterproof mechanism and influence factors of its application discussed. As a new type of waterproof materials, its unique advantage and price decline, it has been widely used in industrial and civil buildings, and the remarkable economic benefits and social benefits has been achieved in past few years. © 2017 Trans Tech Publications, Switzerland.

Cai J.,Nanjing Southeast University | Zhu Y.,China JingYe Engineering Co. | Jiang C.,Nanjing Southeast University | Feng J.,Nanjing Southeast University
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

In the progressive collapse analysis, the dynamic response can be obtained by magnifying the static load with the dynamic magnification factor. However, the values of the dynamic magnification factor are in some dispute. For the space structures, plastic area appears easily in the remaining structure when one member fails. Dynamic magnification factor would vary and become indefinite for the degree of plasticity. Stress ratio method was put forward to determine dynamic magnification factor of string structures. The structural models with different cross-sections were obtained by controlling average stress ratios under the design load. Then the models were studied to get dynamic magnification factor. Three kinds of dynamic amplification factors were defined in order to fully study dynamic amplification response: one was elastic displacement dynamic magnification factor, the second was elasto-plastic displacement dynamic magnification factor and the third was load dynamic magnification factor. The results show that for string structures, the maximum elastic displacement dynamic magnification factor is smaller than 2.0, and the maximum elasto-plastic displacement dynamic magnification factor may be larger than 2.0 because of the development of plastic area. Moreover, if the value of load dynamic magnification factor is assumed to be 2.0, it is conservative. It is suggested that the load dynamic magnification factor should be 1.6-1.8 under the cable failure and 1.3-1.5 under the failure of other important elements. ©, 2014, Science Press. All right reserved.

Luo L.-R.,The MCC Group | Luo L.-R.,China Jingye Engineering Corporation Ltd | Liu Z.-G.,Shijiazhuang Railway University | Yan Y.-C.,China University of Geosciences
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

The function and development of geological prediction are summarized. The misunderstanding of geological prediction and problems of various instruments are analyzed. The concept of geological prediction system is proposed. The contents of geological analysis technology of the tunnel area, prediction technology of bad geological bodies, and warning technology for close major geological disasters are illuminated. The steps of geological prediction system are as follows: the geological factors are classified by intricacy according to the conclusions of geological analysis technology and standards for intricacy classification of geological factors; different programs of geological prediction system are formulated for different geological intricacy degrees; and dynamic control on the site is considered. The geological prediction system is applied to an example of F3 weathered slots of Xiamen subsea tunnel. Finally, the development trend of geological prediction system is put forward. The purpose of this research is to improve the geological prediction work, make the geological prediction results really play a guiding role in the construction process on the site, so as to decrease the investment and casualties of the project to the best extent.

Fu J.-L.,Zhejiang Sci-Tech University | Fu H.,China Jingye Engineering Corporation Ltd | Liu R.-W.,Shaoguan University
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2010

Hojman conserved quantities and Lie symmetries of mechanico-electrical coupling systems are studied. Firstly, choosing a new structure equation which is different from Hojman's form, Hojman's theorems, Hojman conserved quantities and Lie symmetries of continuous mechanico-electrical coupling systems are studied. Secondly, based upon the property of the discrete models entirely inheriting the symmetry of the continuous systems, Hojman conserved quantities and Lie systems of discrete mechanico-electrical coupling systems are presented by Lie groups of transformations of continuous systems; the determining equations of invariance of difference equations and the difference grid are obtained for discrete mechanico-electrical systems; the discrete analogue of Hojman conserved quantities of mechanico-electrical systems are constructed by associated continuous invariant models. Finally an example is discussed to illustrate the results. © 2010 Elsevier B.V. All rights reserved.

Sha Z.,Zhejiang Sci-Tech University | Hao F.,China Jingye Engineering Corporation Ltd | Li F.J.,Zhejiang Sci-Tech University
Science China: Physics, Mechanics and Astronomy | Year: 2011

The Noether and Lie symmetries as well as the conserved quantities of Hamiltonian system with fractional derivatives are established. The definitions and criteria for the fractional symmetrical transformations and quasi-symmetrical transformations in the Noether sense of Hamiltonian system are first discussed. Then, using the invariance of Hamiltonian action under the infinitesimal transformations with respect to time, generalized coordinates and generalized momentums, the fractional Noether theorem of the system is obtained. Further, the Lie symmetry and conserved quantity of the system are acquired. Two examples are presented to illustrate the application of the results. © Science China Press and Springer-Verlag Berlin Heidelberg 2011.

Li A.,Xi'an University of Architecture and Technology | Yin H.,Xi'an University of Architecture and Technology | Zhang W.,China Jingye Engineering Corporation Ltd
International Journal of Ventilation | Year: 2012

The air distribution characteristics formed by an "air curtain" ventilation approach are investigated in detail. The airflow visualization and full-scale experimental results of air distribution in an occupied zone are reported in this paper. The Coanda effect of air curtain ventilation and the spreading airflow over the floor in a room are demonstrated. Additionally, the "air lake" or "air pool" phenomenon created by air curtain ventilation resembles displaced air movement to some extent. An air curtain ventilation approach is regarded as a bridge between mixing flow and displacement flow. In fact, it is a hybrid method of mixing flow and displacement flow. The current experimental study and its results are helpful in understanding a new air distribution method i.e. an "air curtain" used for room ventilation.

Fu W.-G.,China Jingye Engineering Co. | Yang Z.-Y.,China Jingye Engineering Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

There are three stages in the development of soil nail walls in recent 40 years. This technology was born and almost formed at the 1st stage, the theories began to guide practice at the 2nd stage, and now its at the 3rd stage, i.e., application and improvement stage. The technical features are as follows: it is mainly applied to the foundation pit engineering in China and mainly to the permanent engineering in other countries. It is under reasonable restrictions these years because of some disadvantages and will be gradually reduced, but it still has wide development prospect. The deformation, non-destructive testing method, combined support technology, permanency proofing technology, use in all kinds of bad ground, etc. are the study direction and key to the technology of soil nail walls in the future.

Fu W.-G.,China Jingye Engineering Co. | Yang Z.-Y.,China Jingye Engineering Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The depth is the most important characteristic parameters of foundation pits. It is helpful to the exchange and application of retaining and protection technology if the depth can be appropriately classified. It should be characterized as the deep foundation pits when their depth is deeper than 4 m, and be divided into seven levels as low depth, middle depth, high depth, great depth, ultra depth, super depth, extra depth by the standards as 4, 6, 13, 18, 23, 30 m, and there are appropriate methods of retaining and protection for different depths. From the construction safety, 2~4 m low-depth foundation trench should be also included in the scope of management for deep foundation pits. By the standards of area as 100, 2500, 1000, 25000, 50000 m2, the size of pits should be divided into six levels as micro size, little size, middle size, large size, great size and huge size. Finally, the development prospects of foundation pits and excavation technology are proposed.

Fu W.-G.,China Jingye Engineering Co. | Zhuo Z.-F.,China Jingye Engineering Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The definition of soil nail walls is very chaotic and conflictive in China. These definitions can be classified into three types: soil nail walls, bolting and sprayed concrete, and soil nailing. The soil nail walls and the soil nailing are the same technology, and it is better and more accurate when the supporting structure is defined as the soil nail walls. The soil nail walls are different from the bolting and sprayed concrete because of various working principles and behaviors in spite of partial same construction technology. There is an advice which divide different ranges for the three terms to solve contradictions: the bolting and sprayed concrete is used for keeping stability of rocky slopes, rocky foundation pits and surrounding rock; the soil nail walls are for earthy slopes and foundation pits; the soil nailing contains all kinds of soil nail structures such as soil nail walls, soil nail lattice beams, soil nail reinforcement and repair, etc. In addition, when some technologies are applied together, the term is partitioned, hierarchical, combined, and mixed, etc., and it should be applied instead of composite since its concept is not clear and definite.

Fu W.G.,China JingYe Engineering Co.
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability | Year: 2015

The soil nailing wall is a retaining structure widely used all over the world, while the composite soil nailing wall is a composite retaining structure developed on the basis of it, and it is so popular in China as to be used in thousands or more of foundation pit supporting projects each year. The composite soil nailing wall is made up of soil nailing wall and one or more type of the composite components such as ground anchor, cement-soil wall and mini pile, it could be applied to almost all kinds of soil, especially to soft soil layer. Like soil nailing wall, it gets many advantages such as rational construction, low cost, short construction period, convenient installation, simple mechanical equipment, etc. When ground anchor, cement-soil wall or mini pile works separately with soil nailing wall, it will form the three basic composite structures, and when two or three of them work together with soil nailing wall, the other four composite structures will be formed. The concepts, structural features, the overall stability check formulas of the seven structure types of the composite soil nailing wall, and a successful cases about foundation pit with the depth about 21 m are described in this paper.

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