Hebei Research Institute of Construction and Geotechnical Investigation Co.

Shijiazhuang, China

Hebei Research Institute of Construction and Geotechnical Investigation Co.

Shijiazhuang, China
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Shang W.,Hebei Research Institute of Construction and Geotechnical Investigation Co. | Yang G.,Beijing Jiaotong University | Bai B.,Beijing Jiaotong University | Nie Q.,Hebei Research Institute of Construction and Geotechnical Investigation Co.
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2017

By comparing the numerical calculation results of two models, single high-rise building and its high-rise buildings system, the effect on super structure-foundation-soil interaction of adjacent high-rise buildings simultaneous construction is analyzed based on a large number of the measured data of field research using FLAC-3D, including the deformation and mechanical characteristics of pile-raft foundation and soil. The results show that when considering the interaction, adjacent high-rise buildings constructed simultaneously will cause the additional stress superposition and spreading around; the maximum settlement areas occurs an offset and the differential settlementis increased; the raft compressive stress is decreased, while the tensile stress is increased; the pile axial force is increased obviously, especially the pile-top axial force. The effect of adjacent high-rise buildings simultaneous construction in medium-term construction is more obvious. © 2017, Editorial Department of Journal of Beijing Jiaotong University. All right reserved.

Li Z.,Central South University | Li Z.,Changsha Design and Research Institute of Ministry of Chemical Industry | Peng Z.,Central South University | He Z.,Changsha University | Yuan W.,Hebei Research Institute of Construction and Geotechnical Investigation Co.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2017

Based on the method of orthogonal test design, the sensitivity analysis of parameters of the lenticle was performed and a simplification method for lenticles was proposed to increase the efficiency of numerical modeling. Firstly, the depth of seepage line, the displacement of dam crest and the safety factor were considered as the evaluation indexes and the size, horizontal and vertical position, the ratio of major axis minor axis, cohesion and friction of lenticles were treated as impact factors, and the influence of these six impact factors on the safety of tailing dam was discussed through orthogonal experiment design method. An impact coefficient was defined to evaluate the impact degree of six impact factors to the safety of tailing dam, and the judge criterion was established through the combination of the principal component analysis and discriminant analysis. Based on this judge criterion, it was determined whether the lenticle is to be removed from the numerical model. The results show that the simplified method has strong operability in the process, and the calculated safety factor has certain reliability. © 2017, Central South University Press. All right reserved.

Guan X.,Qingdao Technological University | Guan X.,Hebei Research Institute of Construction and Geotechnical Investigation Co. | Fu H.,Beijing Jiaotong University | Wang M.,Beijing Jiaotong University | And 3 more authors.
Modern Tunnelling Technology | Year: 2017

Based on the New Hongyan tunnel of the Chengdu-Chongqing Passenger Dedicated Line, a typical blasting vibration wave and a two-layer masonry structure were selected to analyze the low-order integrated mode and high-order local mode of the masonry structure. The characteristics of displacement and the stress response of the structure to vibrations during tunnel blasting were studied using the modal displacement superposition method. The distribution and variation of the principal tensile stress of brick walls under different particle peak velocities were calculated. The results show that for a typical two-layer masonry structure, the first five stages are of a low-order integrated mode with natural frequencies in the range of 8.80~24.86 Hz and vibration modes that are integrated uniform deformations, while the 6th to 20th stages are of a high-order local dense mode with natural frequencies in the range of 25.96~36.14 Hz and local deformations that are significantly larger than the integrated deformations; the structural displacement induced by high-frequency vibration modals is very small, but the internal force response of local elements are much larger than the displacement since the modal amplitude vector of the internal force calculation is multiplied by the square of the modal frequency; the structure dynamic damage induced by the tunnel blasting vibration is mainly controlled by the instantaneous high stress rather than the displacement; and under intense vibrations, tensile stresses are high at the brick doors, window corners, contact areas of brick and concrete elements with a stress concentration, parapet wall, side-walls, partition walls and balconies and this is where damage often occurs. © 2017, Editorial Office of "Modern Tunnelling Technology". All right reserved.

Ai T.,Chang'an University | Xiang S.,Hebei Research Institute of Construction and Geotechnical Investigation Co. | Wang Z.,Chang'an University
Journal of Materials in Civil Engineering | Year: 2016

As a long-life road surfacing material, epoxy asphalt has many benefits such as high strength, excellent bonding properties, high temperature stability, and high resistance to low temperature cracking. With the increasing use of epoxy asphalt in orthotropic steel bridge deck pavements, there has been an urgent need for a fast, easy, and reliable maintenance method. Microwave heating provides a promising method for epoxy asphalt curing. This study explored the possibility of using microwave heating for epoxy asphalt curing and investigated the effects of microwave heating on chemical and physical properties of epoxy asphalt. An epoxy asphalt suitable for microwave heating was prepared, tested for its tensile properties, and characterized using thermal analysis, infrared analysis, and microscopy tests. The results showed that the epoxy asphalt cured by microwave heating had a better ductility than that cured by conventional heating. The fluorescence and scanning electronic microscopy (SEM) observations showed that microwave curing could reduce the size of asphalt particles dispersed in the continuous phase of epoxy, thus improving the compatibility between epoxy resin and asphalt. © 2016 American Society of Civil Engineers.

Wu H.,Central South University | Huang B.,Tongji University | Huang B.,University of Tennessee at Knoxville | Shu X.,Hebei Research Institute of Construction and Geotechnical Investigation Co. | Yin J.,Central South University of forestry and Technology
Construction and Building Materials | Year: 2016

Due to increasing generation of solid wastes from papermaking industry, major concerns arise about the disposal of the solid wastes and their adverse impacts on environments, in which the disposal of paper sludge massively produced from paper mills has become one of the most serious solid waste problems worldwide. In this study, laboratory experiments were conducted to evaluate the feasibility and applicability of incorporating solid wastes from paper mills into controlled low strength material (CLSM), in which fly ash was used as a substitute for cement, bottom ash was added by partially replacing fine aggregate, and paper sludge was treated as a fibrous admixture. Results show that both fly ash and bottom ash could be effectively used in production of CLSM mixtures with desired performances. By limiting the amount of cement used in the mixture, the ultimate strength of CLSM could be controlled for easy excavation. Fly ash could effectively increase flowability of the mixture, thus improving self-compactibility. Both bottom ash and paper sludge had an adverse effect on the flowability. The strength of CLSM was reduced when a higher content of fly ash was incorporated to replace cement, while the strength was increased when more river sand was replaced with bottom ash. Due to a high water absorption and poor dispersibility of paper sludge, the CLSM made with additional paper sludge exhibited a relatively low flowability and a reduction in strength. However, with proper mixture design, paper sludge could still be effectively used in CLSM. © 2016 Elsevier Ltd. All rights reserved.

Zhang L.-Q.,Hebei Research Institute of Construction and Geotechnical Investigation Co. | Chen J.,Hebei East Plan Architecture Design Co. | Qu C.-L.,Hebei Research Institute of Construction and Geotechnical Investigation Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

Based on the project cases in Karst region of Tangshan in recent years, some issues occurred in karst treatment and pile foundation construction are analyzed according to the differences with litho logy, karst developing characteristic and karst treatment method. The methods of karst treatment together with the construction technology of pile foundation are sumarized combining with the technical measures and the application of pile foundation adopted in karst treatment. Meanwhile, comprehensive analysis of the measured values of end bearing, skin friction, pile body stress, pile body compression and pile top settlement is conducted according to the core recovery and RQD of the pile tip resistant layer. The results are regarded as the basis of treatment method and design in similar projects. Aiming at karst developing characteristics and common issues in pile construction, effective construction method, technology and measures are proposed, and it may helpful for the pile foundation construction in similar projects.

Zhao Q.,Yanshan University | Yu J.,Hebei Research Institute of Construction and Geotechnical Investigation Co. | Geng G.,University of California at Berkeley | Jiang J.,Nanjing Southeast University | Liu X.,Yanshan University
Construction and Building Materials | Year: 2016

In this paper, the effect of fiber types such as steel fiber, polyvinyl alcohol (PVA) fiber, polypropylene (PP) fiber and basalt fiber, on the creep of concrete after one-year-loading was studied and the principle of fiber's effect on concrete creep was analyzed. The elastic modulus of fibers is shown to be the most significant factor influencing concrete creep. Fibers with elastic modulus much higher than plain concrete can clearly restrict creep, while fibers with lower elastic modulus have the opposite effect. For example, 2% volumetric blending of steel fiber reduces specific creep by 25.1%, compared with plain concrete, while 0.9 kg/m3 mass blending of PVA fibers increases it by 19.9%. The internal defects introduced by fiber addition, i.e., the fiber-concrete interfacial zone and non-uniform fiber distribution, weakens its creep resistance. There is a clear correlation between the 28 days elastic modulus of fiber reinforced concrete (FRC) and its long-term creep behavior, indicating that they are influenced by similar factors. Larger elastic modulus at 28 days tends to yield less specific creep at 1 year. © 2015 Elsevier Ltd. All rights reserved.

Li H.-W.,Beijing Jiaotong University | Nie Q.-K.,Hebei Research Institute of Construction and Geotechnical Investigation Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

Based on a large number of measured data for pile-anchor retaining structures used in deep an excavation in-situ, the evolutions of ground surface settlements, the horizontal displacements, the cap beam horizontal displacements with time were analyzed. Besides, the evolutions of internal stress of retaining piles(i. e. the reinforcement stresses inside cap beam and retuning piles, bending moments of piles) and earth pressure distribution of piles were also discussed. Based on the dynamic evolution concept of deformation and force, the relationship between these physical values(i. e. the deformation and force) of retaining structures in space and with time was studied.

Bai B.,Beijing Jiaotong University | Nie Q.,Hebei Research Institute of Construction and Geotechnical Investigation Co. | Wu G.,Beijing Jiaotong University | Su Z.,Beijing Jiaotong University
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010

A model for double-row-pile retaining structures which considers three dimensional effects of deep foundation pit was proposed. This model has the following characteristics: the stiffness coefficient of top beams along the side of a foundation pit can be calculated, and the displacement and bending moment distributions of top beams can also be obtained; the stresses and displacements along the piles can be calculated using finite element method, including any pile distance (zero pile distance is considered as a single row) and different pile length between the two rows. A calculation program is developed based on the above model. The results show that the horizontal displacements of the top beam are bigger in the middle of the pit side than those at other locations, and the horizontal displacement also increases along with the depth of excavation. The displacements at the top of piles are smaller due to the effects of the top beams, but the displacements at the half height of the piles increase along with the excavation depth. Besides, with the increase of the stiffness coefficients of top beams, the displacements of the piles decrease and the bending moments in piles increase. The calculation results are in good agreement with the measured data in-situ.

Nie Q.,Hebei Research Institute of Construction and Geotechnical Investigation Co. | Bai B.,Beijing Jiaotong University
Geotechnical Special Publication | Year: 2014

This paper investigates the consolidation and shear strength of compacted red clay samples (before and after inundation) in Guangxi, China through laboratory tests. The unconfined shear strength of both undisturbed and remolded specimens in the process of reducing or adding water content was also studied. The studies show that, in moisture-density curves, the maximum dry density of the remolded specimen is greater than that of the undisturbed specimen. However, the optimum water content of the former is smaller than that of the latter. When the compacted specimens are subjected to a vertical load, the vertical deformation reaches steady state in a short time with a small value. After inundation, the increment of the vertical deformation is also very small. However, the unconfined shear strength of the red clay specimens with slightly higher water content is much better than that of those with lower water content. The test results also show that the dehydration or humidity absorption has significant effect on the shear strength of red clay, especially for the remolded specimen. © 2014 American Society of Civil Engineers.

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