Li Y.,Hubei Engineering University |
Yi H.,Shenzhen Geotechnical Investigation and Surveying Institute Co. |
Wu J.,XiAn Changqing Technology Engineering Co. |
Xu L.,Hubei Engineering University
Revista Tecnica de la Facultad de Ingenieria Universidad del Zulia | Year: 2016
The use of recycled concrete has become an important means to solve the waste concrete in order to reduce pollution and save resources. This paper uses the gray relational model to analyze the experimental data of recycled concrete. Based on sensitivity analysis of replacement ratio of recycled coarse aggregate, admixture, water-binder ratio, cement, fine aggregate and coarse aggregate, the sensitivity of each influencing factor on the strength of recycled concrete is obtained. Cement, coarse aggregate, fine aggregate and water-binder ratio have significant effect, and the correlation coefficient is 0.75-0.84. The influence of the replacement ratio of recycled coarse aggregate, aggregate grade and admixture is moderate, compared to the above factors, and the correlation coefficient is 0.64-0.69. However, aggregate type is the least influence with correlation coefficient 0.46. According to the sensitivity analysis, the suggestions for the strength of recycled concrete are put forward. Hope to provide reference for the follow-up study.
Guan J.,China Petroleum Pipeline Bureau |
Wang M.,Xian Changqing Technology Engineering Co.
Natural Gas Industry | Year: 2010
The Gansu section of the Line Two of West-East Natural Gas Transmission Project intersects at one place with the Guanguanling seismic fracture zone. If the long-distance natural gas transmission pipeline experiences an earthquake, which is stronger than the basic earthquake intensity at the zone, this will result in pipeline break, buckling instability, and abruption. The matters that need attention in pipeline design and construction in the seismic fracture zone are presented. The laying techniques used in the Line Two at the Guanguanling seismic fracture zone are described. The intersection angle between the line and the zone was optimized through continuous adjustment. A rigorous calculation analysis was performed on some parameters, such as pipe wall thickness. The X80 HD2 deep drawing steel pipe was first adopted in China to avoid or to reduce the impact produced by an earthquake and to prevent the secondary disasters. The anti-seismic and shock-proof design philosophy and technical measures were enhanced to ensure the safe operation of pipelines. It has accumulated valuable experiences for the similar projects.
Zeng Z.,Xi'an University of Technology |
Zeng Z.,North China University of Water Conservancy and Electric Power |
Zhang Z.-H.,North China University of Water Conservancy and Electric Power |
Yang H.-L.,Xian Changqing Technology Engineering Co. |
And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012
Progressive failure feature of slope is difficult for numerical simulation of slope. Also practical slope failure process is rarely a whole and sudden slipping one, is often step by step one from local deformation to final and overall instability, which is a chain domino style failures triggered by small disturbance under critical condition. Here by particle flow code (PFC), a numerical slope with cohesion between particles being 36 kPa, friction coefficient between particles being 0.36, 0.1 m particle size and 10 m height is designed, initial models damage will not occur under gravity condition. Slope failure is done by cohesion strength between particles reduced to half of initial one. Slope shapes of each 20000 steps, total steps being 200000, are obtained by monitoring change of vertical particle groups at horizontal intervals of 1m, which directly reveals progressive failure of slope. Found that failure is always beginning from local part, movement of slope body material results in secondary damage in slope, which forms final arc sliding surface. These account for sliding isn't a whole declining of slope body, the body isn't a rigid one. Stress conditions along slip surface don't reach limit state at the same time. Change of stress in slope body isn't a monotonous one, but a process with rises and falls. All these conclusions contradict assumptions in current limit equilibrium methods such as rigidity of finite slice, simultaneously reaching limit sate on slip surface, making statically indeterminate problem solved by force transfer mode between slices given, overall analytical method not presenting localization and progressive feature of failure, which hints future of slope computing method lies in discrete element methods can present dynamic practical problem and material real failure characteristics.
Yin X.-T.,CAS Wuhan Institute of Rock and Soil Mechanics |
Zheng Y.-N.,Xian Changqing Technology Engineering Co. |
Ma S.-K.,Chinese Research Institute of Highway
Yantu Lixue/Rock and Soil Mechanics | Year: 2011
Inner scale ratio is a ratio between minimum crystal structure of material and its specimen size. Rock and soil material, being a type of different sizes mineral particles assembler under microscopic conditions, contains different scale raw faults. These size features of material structure will affect accuracy of rock and soil material characteristics test results. That is to say there exists inner scale ratio in rock and soil materials like that of metal material. So virtual uniaxial compression test done by inner embedded fish language of particle flow code is used to study inner scale ratio of geotechnical material. Twelve numerical specimens with twelve types of grain size such as 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8 and 2.0 mm are designed and tested. According to failure shape and stress-strain curve of these specimens, effect of inner scale ratio on test results is analyzed. It is found that the computing time increases dramatically and computing efficiency decreases sharply if grain size less than 0.4 mm; and that test results tend to stability and accuracy if inner scale ratio less than 0.01, so as to prove existence of inner scale ratio in rock and soil material. Size effect in geotechnical material is reflection of inner scale ratio.
Tang K.,Chengdu University of Technology |
Zhou N.-N.,Xian Chang Qing Technology Engineering Co. |
Wutan Huatan Jisuan Jishu | Year: 2012
Due to the complex geological condition and changeable productivity, there are many factors effect on the productivity in low porosity and low permeability reservoir. It is difficult to predict productivity. Aiming at this problem and based on the data of sixteen wells of s2 gas pool of Zizhou gas field, 10 factors affecting the productivity are selected by using open flow potential as a evaluation index of the gas well productivity. Then we found the key factors by using the methods of grey slope relational analysis, principal component analysis and R cluster analysis. Although there are some differences in the key factors, effective thickness, gas saturation, storage coefficient and formation coefficient are in front. Finally comprehensive analysis indicates that the key factors effecting on the gas well productivity of the reservoir include effective thickness, gas saturation, storage coefficient and formation coefficient. This conclusion has some directive significances for wells and layers selection, fracturing design and fracturing operation.
Xu Q.,Xian Changqing Technology Engineering Co. |
Li N.,Xian Changqing Technology Engineering Co. |
Natural Gas Industry | Year: 2014
To achieve the goal of low-cost and high-efficiency commercial development, operators should focus on the standardized design and modular construction for the ground surface gathering and transportation project of a CBM gas field. In view of this, we first introduced the philosophy of the standardized design in this case. With the optimized, simplified technologies and sizing systems as the core, modular design should be essentially emphasized on those batch-level, commonly-used, and repeated activities. This standardized design covers all the ground surface engineering construction in either a well site or a gathering station, making flow process generalized, well site ground standardized, processing facilities stereo-typed, design & installation modularized, pipe valves & accessories normalized, construction codes unified, safety design humanized, equipment & materials localized, production management digitalized. After the standardized design was employed in the Zhengcun Block of the Qinshui CBM Gas Field, the construction period was shortened by 30%, the once welding pass rate reached 90%, and the overall economic profit increased by 44 million yuan (RMB) per 100 million m3. In conclusion, this standardized design is reliable and practical in improving ground surface construction level, normalizing the ground construction codes, making prefabrication and assembly quite easy in operation, and guaranteeing the quality, safety and efficiency of the whole ground-surface engineering project in a CBM gas field.
Liu H.,Southwest Petroleum University |
Liu J.,China Oilfield Services Ltd. |
Dai C.,China National Petroleum Corporation |
Zhang Y.,Xian Changqing Technology Engineering Co.
Xinan Shiyou Daxue Xuebao/Journal of Southwest Petroleum University | Year: 2015
This paper mainly discussed the abnormal responses of amplitude attenuation resistivity and phase shift resistivity detected by logging-while-drilling resistivity instruments in the borehole of large deviation and horizontal wells. Combining with the simulation results of EMF of the LWD resistivity responding in borehole environment, the paperwe analysed the major characteristics and reasons of abnormal corresponding of these two kinds of resistivity. And then, we listed the curves of the LWD amplitude attenuation and phase shift resistivity of three typical wells of Bozhong area of CNOOC company, which were logged by EWR-Phase 4 of Halliburton International company, The amplitude resistivity and phase shift resistivity of this three wellsto illustrate a typical unusual changes in the curve morphology. With discussion on lithology of the formation, permeability of reservoir, mud invasion, drilling velocity(ROP) and environment of borehole, the curves reading range and variation trend are examined for the X-Shallow, shallow, mediate and deep resistivity. In the endFinally, the paperwe summarizes that the abnormal corresponding types, such as Zorro effect, lace curtain effect and polarization angle effect, are most frequently encountered in the high angle and horizontal wells logged by EWR-Phase 4 tools. ©, 2015, Southwest Petroleum University/Xinan Shiyou Daxue. All right reserved.
Yu J.,Xi'an University of Architecture and Technology |
Liu X.,Xi'an University of Architecture and Technology |
Zhao Y.,Xian Changqing Technology Engineering Co.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2015
Three different height-width ratio RC frame structures located in intensity region 8 (0.2 g) were designed and analyzed using monolithic model and joint model by OpenSees program. The results show that the degree of influence of joint on seismic performance of frame structure and the structure of component into the nonlinear construction related. Under small earthquakes, the structure is in elastic state, and the influence of construction joints can be neglected. In the moderate and strong earthquakes, the structure is in a nonlinear stress state. Influence of construction joints began to highlight, and are mainly shown in the increase of top displacement structure, of inter story displacement angle and the changes of the interlayer displacement angle displacement distribution of bottom displacement form aggravation of and the key components local reactions aggravate. It is necessary to consider the influence of construction joints from the seismic design. Based on the existing two stage design method, seismic design recommendations were proposed from concept design and calculation method. ©, 2015, Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology. All right reserved.
Li B.-K.,China University of Petroleum - Beijing |
Sun R.-J.,China University of Petroleum - Beijing |
Gou Y.-P.,Xian Changqing Technology Engineering Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2015
The teapot refineries account for approximately 20% of China's oil refining capacity. To follow the tendency that the national policy is considering to release the crude oil import right for teapot refineries, the current status of these teapot refineries is reviewed. The main bottlenecks restricting their further development, including the shortage of crude oil and narrow distribution channels, are analyzed. The effect of marketization tendency of liberalizing crude oil import right on the teapot refineries is studied. Several measures and suggestions are proposed as follows: strengthening the regulation of crude oil liberalization and promoting marketization process in the aspect of China, performing a functional role of planning and oversight in the aspect of local governments and seeking specialized and refined development path based on the unblocked upstream and downstream in the aspect of teapot refineries. ©, 2015, Xiandai Huagong/Modern Chemical Industry. All right reserved.
Liu B.,Xian Changqing Technology Engineering Co. |
Liu J.,Xian Changqing Technology Engineering Co.
ISWREP 2011 - Proceedings of 2011 International Symposium on Water Resource and Environmental Protection | Year: 2011
The large storage tank exerts a high requirement on differential settlement and ground water serves as an important geological factor that causes uneven settlement. The present paper, in view of the characteristics of ground water in a large storage tank area, initiates the research and application of natural potential exploration technology to evaluate the distribution of groundwater and water table fluctuations on the site, and then locate the exceptional area of what hydrologic environmental concerns. © 2011 IEEE.