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Yanbin Luo,Yunfei Wu,Jianxun Chen,Fangfang Dong,Weiwei Liu,Lijun Chen,Yao Li,Zhou Shi 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.1
Rock mass pressure has always been a research hotspot in the field of tunnel engineering, especially in the super large-span tunnel, which is characterized by flat section, large excavation span, and complex stress field. Based on the Letuan Tunnel (a bi-directional tunnel with eight traffic lanes) of Binlai expressway expansion project in Shandong Province, China, this paper focused on the calculation method of rock mass pressure and the evolution law of load release in the construction process of the super large-span tunnel excavated by upper-bench central diaphragm (CD) method. Based on field measured data of Letuan Tunnel, the deformation behavior of primary lining and the distribution state of rock mass pressure during the tunnel construction were analyzed. According to the bearing mode of supporting structure, the mechanical models of different construction stages were established. Then, the rock mass pressures in different construction stages were back-calculated using mechanical models and compared with the measured values, and the evolution law of load release during the tunnel construction was discussed. The study results show that the tunnel deformation and rock mass pressure were significantly affected by the construction process and support form, and the excavation span was the key factor affecting the stability of rock mass. For the shallow-buried super large-span tunnel constructed by upper-bench CD method, the primary support of upper bench was under eccentric pressure. The comparison between the back-calculated value and the field measured value indicated that they were similar, and the average relative error was 17.23%. According to the concept of load release coefficient proposed in this paper, the load release coefficient after the pilot tunnel ahead (Part I) excavation reached 63%, and the load release coefficient after the pilot tunnel behind excavation (Part II) was 37%, which means that the rock mass pressure of Part I is increased about 59% due to the excavation of Part II.
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Experimental analysis of component morphology by fused coating process
Guangxi Zhao,Zhengying Wei,Jun Du,Yunfei Yao,Wei Liu,Xin Wang 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
Fused coating process is a novel method for additive manufacturing technology, which has greatly reduced the cost and improved the efficiency. A series of experiments were carried out with the orthogonal method using pass width and height to evaluate. The order of factors influence degree on width and height were figured out, and it’s found that the air pressure at the top of the nozzle is the most influential. The morphologies of single passes at different temperatures were measured and fitted separately with parabola, circular arc and cosine function, and the goodness of fit was compared and analyzed, based on which the overlapping models were investigated. Four kinds of overlapping patterns were mentioned for the single-layer multi-pass model. The relationship between central distance of adjacent layers and overlapping patterns was calculated out. Furthermore, experimental pieces with suspended structure were processed without supporting material. It is found that when the tilt angle is smaller than 40° the inclined thin wall will collapse.
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