PowerChina Chengdu Engineering Corporation Ltd

Chengdu, China

PowerChina Chengdu Engineering Corporation Ltd

Chengdu, China
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Zheng X.,Powerchina Chengdu Engineering Corporation Ltd | Yuan Q.,Powerchina Chengdu Engineering Corporation Ltd | Shen J.,University of Electronic Science and Technology of China
ACM International Conference Proceeding Series | Year: 2016

Near Field Communication (NFC) is a newly raised technology which resembles RFID and backward compatible with RFID in recent years. Nowadays, an increasing number of intelligent mobile terminals are assembled with built-in NFC chips. A complete NFC service framework consists of three partitions, namely, the content editing, content writing and content reading. However, there is no unified solution which implements all of the three parts listed above up to now. To propose a solution, this paper establishes a NFC-based context model for information management system, through which a self-contained NFC service framework is achieved. The architecture of the model is populated by an NFC tag used to carry the content, a web server which acts as a back-end system, providing services such as content creating and editing, and two kinds of mobile terminals, one performs the content writing and another performs the content reading. © 2016 ACM.

Wang R.,PowerChina Chengdu Engineering Corporation Ltd
Engineering | Year: 2016

Starting with the Ertan arch dam (240 m high, 3300 MW) in 2000, China successfully built a total of seven ultra-high arch dams over 200 m tall by the end of 2014. Among these, the Jinping I (305 m), Xiaowan (294.5 m), and Xiluodu (285.5 m) arch dams have reached the 300 m height level (i.e., near or over 300 m), making them the tallest arch dams in the world. The design and construction of these 300 m ultra-high arch dams posed significant challenges, due to high water pressures, high seismic design criteria, and complex geological conditions. The engineering team successfully tackled these challenges and made critical breakthroughs, especially in the area of safety control. In this paper, the author summarizes various key technological aspects involved in the design and construction of 300 m ultra-high arch dams, including the strength and stability of foundation rock, excavation of the dam base and surface treatment, dam shape optimization, safety design guidelines, seismic analysis and design, treatment of a complex foundation, concrete temperature control, and crack prevention. The experience gained from these projects should be valuable for future practitioners. © 2016 THE AUTHORS

Mao J.,Southwest Jiaotong University | Jiang Y.,Power China Chengdu Engineering Corporation Ltd
Tiedao Xuebao/Journal of the China Railway Society | Year: 2017

A method to calculate the settlement of pile foundation based on the results of vertical static load test of single pile and the elastic theory method was presented. In the method, the settlement of every pile due to its own vertical load was determined by the settlement-load curve of vertical static load test, while the settlement caused by other piles was calculated with the elastic theory method based on the test result of side friction curve and toe force of pile. Tentative calculation was performed on the different vertical forces of each pile to find out the solution. that met the equilibrium equation of pile cap and the coordination conditions of the settlement of each pile. Following the theory, corresponding calculation formulae were constructed and calculation program was compiled. Finally, the settlement of the pile foundation of a bridge was calculated with the method and the better agreement of the results between the calculation and in-situ measurement proved the feasibility and rationality of this method. © 2017, Editorial Office of Journal of the China Railway Society. All right reserved.

Li H.-B.,University of Sichuan | Liu M.-C.,Yalong River Hydropower Development Company | Xing W.-B.,Power China Chengdu Engineering Corporation Ltd | Shao S.,University of Sichuan | Zhou J.-W.,University of Sichuan
Rock Mechanics and Rock Engineering | Year: 2017

The Jinping I underground powerhouse is deeply buried and is one of the largest underground powerhouses in China. As a result of high levels of in situ stress, complex geological conditions and the effects of excavation in adjacent caverns, the surrounding rock mass has been severely deformed and broken, and excavation damaged zones (EDZs) have become major obstacles to the design of cavern excavation and support. Field investigations and monitoring data indicated that there are two main modes of failure: high tangential stress induced failure and progressive failure, which have occurred on the mountain side and the river valley side of the Jinping I underground powerhouse. These two main modes of failure were due to strong secondary principal stress forces in the sub-parallel directions and sub-vertical directions, acting on the axes of the main powerhouse on the mountain side and on the river valley side, respectively. Deformations and EDZs on the river valley side were generally larger than those found along the mountain side, and the distribution of deformations was consistent with the distribution of EDZs. The evolution of the EDZ on the river valley side has clearly been time dependent, especially along the downstream arch abutment, and the EDZ was considerably enlarged with further excavation. Additionally, the deformation of the surrounding rock mass was first initiated from the edge of the excavation area and gradually extended to deeper areas away from the opening. However, the EDZ on the mountain side was enlarged only during the first two phases of excavation. The extension of pre-existing cracks and the creation of new fractures has mainly occurred in the oldest EDZ section, and the HDZ has been visibly enlarged, whereas the EDZ has shown little change in other excavation phases. © 2017 Springer-Verlag Wien

Yuan X.,Power China Chengdu Engineering Corporation Ltd
IOP Conference Series: Earth and Environmental Science | Year: 2017

To achieve the strength and deformation characteristics of sandy mudstone under the unloading condition, a triaxial unloading test was performed on a group of sandy mudstone taken from the diversion tunnel of a hydropower station. The results show that the stress-strain curve slope of sandy mudstone increases suddenly at the moment of unloading confining pressure, and there is no significant decline in the whole test. There is usually only a whole shear failure surface in the samples damaged under low initial unloading confining pressure while those damaged under high one develop tensile fracture. The introduction of semilog method helps to solve the problem that it's difficult to get the peak intensity of sandy mudstone directly based on the variation characteristics of the stress-strain curve. From the initial stage of unloading to the damage of the samples, the reduced percentage of sandy mudstone deformation modulus is positively correlated with initial unloading confining pressure. The decrease rate of deformation modulus and increase rate of axial strain of sandy mudstone are both mutate under destructive confining pressure. The research results can provide an useful reference to research on the mechanical properties of similar soft rocks. © Published under licence by IOP Publishing Ltd.

Chen Q.,PowerChina Chengdu Engineering Corporation Ltd | Chen Q.,HIGH-TECH
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

Complex geologic conditions like fault, extrusion zone, development of deep crack, heavy unloading of rock of Jinping I arch dam have contribute the foundation treatment to be the key part of the whole project. As regular cement grouting can not solve problems like strength of weak rock, deformation, penetration completely, so cement chemical compound grouting was studied systematically combining with the development of new material technology in recent decades. The method of cement grouting firstly, then chemical compound next was proved to improve the strength and anti-permeability of weak rock effectively and greatly. Based on the various field tests, cement chemical compound grouting has successfully applied to the treatments of the weak parts of dam foundation in important area, result in significant increase of their sonic speeds, deformation modules, anti-seepage abilities, integrities and stiffness. According to the feedback analysis of dam structure during the third impoundment stage, cement chemical compound grouting has been successfully applied in the Jinping I arch dam foundation treatment, and solved one of the critical technical problems of high arch dam construction. ©, 2015, Academia Sinica. All right reserved.

Zhao X.,PowerChina Chengdu Engineering Corporation Ltd | Chen S.,PowerChina Chengdu Engineering Corporation Ltd
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

In general, the problem of rock mechanics is the mechanical behavior of fractured rock-mass in the engineering scale, especially the strength distribution, deformation character and failure evolution of fractured rock-mass under loading. In this paper, the study of failure evolution process and differences between intact coal and fractured coal rock-mass with single fracture and multiple fractures, according to the distribution of max-amplitude of acoustic emission under uniaxial loading, is based on specimens of fractured coal rock-mass obtained by pre-loading on intact coal. The study results are as follows: the value of b can describe the distribution regularity of max-amplitude of AE during the failure evolution process under loading, and the value increases with increasing block to the expansion of fractures in specimen; the value of b decreases with increasing loading under different stress level and increase with increasing fracture under the same stress level; it can be considered as the precursor of specimen's failure when the decrease of b value becomes flat according to the regularity of b value in intact coal and fractured coal rock-mass during the failure evolution process, and that can provide a test basis for the application of AE technology of monitoring and prediction in situ. ©, 2015, Academia Sinica. All right reserved.

Wang R.,PowerChina Chengdu Engineering Corporation Ltd
Advances in Science and Technology of Water Resources | Year: 2015

Based on construction and operation of a series of super-high arch dams in China, such as the Ertan Arch Dam, Xiluodu Arch Dam, Jinping-I Arch Dam, Dagangshan Arch Dam, and Xiaowan Arch Dam, construction achievements of super-high arch dams are summarized, and advances in key technologies for super-high arch dam construction are described, including determination of arch dam foundation, shape optimization design, stress analysis and strength design, techniques for stability of dam foundation against sliding, techniques for dam body stability, anti-seismic design, concrete material study, and temperature control and crack prevention of concrete, foundation treatment, and construction technology. It is suggested that construction technology of concrete arch dams in China has reached an internationally leading level. It is pointed out that four issues in construction of super-high arch dams should be further studied: construction of dam safety evaluation systems, dam risk design, anti-seismic measures, and dam health diagnosis technology. ©, 2015, Editorial Office of Journal of Hohai University (Nature Sciences). All right reserved.

Li G.,Powerchina Chengdu Engineering Corporation Ltd
Advances in Science and Technology of Water Resources | Year: 2014

In order to investigate the effect of low heat Portland cement on concrete dam volume stability, we applied the test method according to the Hydraulic Concrete Testing Procedures (SL 352-2006) regulations. Overall, the experimental studies show: low heat Portland cement concrete has characteristics of low temperature deformation, low shrinkage and reducing swelling alkali reactivity. Further, compared with moderate heat Portland cement, low heat Portland cement concrete can increase the volume stability of dam. ©, 2014, Advances in Science and Technology of Water Resources. All right reserved.

Peng S.,PowerChina Chengdu Engineering Corporation Ltd
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014

The reservoir bank collapse is a common geological problem in the reservoir impounding process. There often exists significant difference between the prediction and the actual collapse ranges. A new method, named as balanced alluvial accumulation approach, is proposed for the prediction of reservoir bank collapse on the basis of the surveying of bank collapse cases of more than 10 large reservoirs in China, the measurement on all kinds of stable angle of collapse phenomenon, and the analysis of the applicable conditions, the collapse mechanism and the collapse factors of the current prediction method of bank collapse. The new method has the reasonable initial points and prediction parameters and overcomes the deficiency of the traditional prediction method of bank collapse. It is also verified by a case study.

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