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The construction process of deep excavation in urban areas should ensure the soil stability and protect the safety of the surrounding environment, so it becomes one of the most complex civil engineering technologies.
References [1] Excavation Engineering Manual [M].
Deep Excavation Engineering Technology [M].
Journal of Geotechnical Engineering, 2000, 22 (3): 348-352 [4] G.
Journal of Rock Mechanics and Engineering, 2001, 20 (2): 202-207

Dynamic Responses of Red Sandstone with Fluid-solid Coupling under Impact Loading Hua Lu a, Bo Huang, Huashuai Zhao, Meng Meng and Ming Liang School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, China amegan_lu@163.com Keywords: red sandstone, fluid-solid coupling, impact loading, dynamic responses.
Liang Bing [5] analyzed the coupling mechanism of multi-phase rock mass under the complex environment of underground engineering.
Such as stability of underground engineering in rock mass and the dam foundation, underwater tunnels and underground disposal of nuclear waste, etc.
Chinese Journal of Geotechnical Engineering.
Chinese Journal of Rock Mechanics and Engineering.

However, only the lowest eigenvalue or the minimal stability safety factor had real meaning in engineering, when the eigenvalue was crλ , critical load was { }cr Fλ .
The concept of this method was clear; calculation was simple in principle, could meet the requirements of precision in engineering application.
Earthquake Engineering and Engineering Vibration Vol.25 (2005), p. 91-98 [4] R.
Earthquake Engineering Vol.29 (2000), p. 195-212 [5] L.
China Municipal Engineering Vol.121 (2006), p. 20-23 [10] Y.H.

The majority of MR fluid technology appears in semi-active damping devices(MR dampers).MR dampers find applications in small devices, for example above the knee prosthetics[7], to large systems, such as earthquake mitigation in civil structures [3].
Engineering Structures.Vol.24, n.3 (2002).P.309-323
Perry, D.W.Green: Perry's Chemical Engineers Handbook.
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering. 217(D12) (2003).p.1095-1106
Phillips: Engineering Applications of Fluids with a Variable Yield Stress.

The Influence of Column- to- Beam Strength Ratio on Seismic Performance of Concrete Filled Tube Moment-Resistant Frames Ben Moua, Peizhen Xub , Xia Wuc , Daiming Gaod and Laicheng Zhangd School of Civil Engineering, Qingdao Technological University,Qingdao, Shandong, 266033, China a mb455828122@yahoo.com.cn, b xpzzyg1@163.com, c 80houxiaxuan@163.com , d 8@163.com Keywords: Strength ratio in a layer; Pushover analysis; Seismic response; Dynamic analysis; Concrete filled tube Abstract.
References [1] Peizhen.Xu ,Kawano Akihiko: Effects of column–to-beam strength ratio on earthquake responses of CFT moment resistant frames permitting inner columns to yield, 8th international symposium on structural engineering for young experts xi’an, china , pp.545-552, 2004 [2] Kawano Akihiko, Mstsui Chiaki , Tanaka Yukihito:An experimental study on concrete-filled circular tube beam-columns under cyclic horizontal and axial loading [in Japanese],Journal of structural and construction engineering.
Etc: Structural performance and axial load limit of concrete filled steel square tubular columns [in Japanese], Journal of structural and construction engineering.
Transactions of AIJ (504), 103-110, 1998.2  [4] Nakahara Hiroyuki, Ninakawa Toshihiko, Sakino Kenji: Cyclic bending behivior of concrete filled steel tubular columns under constant gravity load  [in Japanese] Journal of structural and construction engineering.
Code for seismic design of building (GB50011-2001) .Beijing: China architecture &building press, 2001 [8] China association for engineering construction standardization: Technical specification for structures with concrete-filled rectangular steel tube members CECS159, 2004

Energy Saving in Mine Ventilation Roadway and Its Optimization Model Solving Jie Liu1, a, Peng Yang 2, 1, b and Wensheng Lv1, c 1 Civil & Environmental Engineering School, University of Science & Technology Beijing, China 2 Beijing Key Laboratory of Information Service Engineering, Beijing Union University, China aliujie19860809@qq.com, byangpeng@buu.edu.cn, csunluw@sina.com Keywords: mine ventilation, cost, least square method, cross-section, model Abstract.
If the total investment of roadway engineering was WJ (yuan/m), the time of capital construction was tj (a), the average investment of capital construction was Bj=WJ/tj (yuan/m) and the annual interest rate was i1.
Engineering example Least Squares Fit.
Direct and auxiliary costs of roadway excavation engineering should be checked in references [7], thus, the roadway cross-section could be fitted by least square method.
Mine engineering budget quota of nonferrous metals Industry (CNMIA Group Press, Beijing 2008).

Lockman4, Anas Alalwani5 1,2,3,4,5 Department of Structure and Material Engineering, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, 86400 Batu Pahat, Johor, Malaysia *wigoh@uthm.edu.my Keywords: HDPE plastic balls, self-weight, structural behaviour, flexural load, deflection Abstract.
Samad, Compression Test and Finite Element Analysis of Foamed Concrete Cube, Journal of Engineering and Technology (JET), Vols 5-1, pp. 1-10
G, The choice of recycled concrete aggregates for flexural members, Proceedings of 18th International Association for Bridge and Structural Engineering Congress on Innovative Infrastructures, Seoul, Korea. 2012
Madhava Varma, Bending Behaviour of Aluminum Honey Comb Sandwich Panels, International Journal of Engineering and Advanced Technology (IJEAT) ISSN: 2249 – 8958, Volume-1, Issue-4, 2012
[12] Lan Chung, Sang-Hyun Lee, Seung-Ho Cho, Sung-Sik Woo, Kyoung-Kyu Choi, Investigations on Flexural Strength and Stiffness of Hollow Slabs, Journal of Advances in Structural Engineering, Vol. 13, No. 4, 2009.

Researches of a Magneto-rheological Fluid Damper with External Coil Based on Electromagnetic Finite Element Analysis Xiaomei Xu1, a, Caimin Zeng2,b 1 College of Automobile and Traffic Engineering, Nanjing Forestry University, China 2 Nanjing Communication Technician College, Nanjing, China axxm120480@126.com, bzcm120480@126.com Keywords: MR fluid damper, electromagnetic analysis, finite element analysis(FEA), damping force, damping characteristics, external coil.
MR fluid dampers are considered as good candidates for reducing vibration and have been studied by a number of researchers in the fields of civil engineering, structure control engineering and vehicle engineering[2,3].
References [1] H.H.Tsang, R.K.L.Su, A.M.Chandler, Simplified inverse dynamics models for MR fluid dampers, Engineering Structures. 28(2006), p.327-341
Ozbulut, Stefan Hurlebaus, etc, Application of semi-active control strategies for seismic protection of buildings with MR dampers, Engineering Structures. 32(2010), p.3045
[5] X.C.Guan, P.F.Guo, J.P.Ou, Modeling and Analyzing of Hysteresis Behavior of Magneto Rheological Dampers, Procedia Engineering. 14(2011), p.2756

Ultrasonic Non-destructive Test of Stresses in Rock under High Temperatures Guangjun YANG 1,a, Xuewen LIU 2,b and Xingchun HUANG 3,c 1，2，3 School of civil engineering and mechanics, Shanghai Jiaotong University, Shanghai, 200030, People's Republic of China a Ygj@sjtu.edu.cn , bLiuxuew2002@sjtu.edu.cn, cHuangxc@sjtu.edu.cn Keywords: High temperature effect, marble rock formation, stress ultrasonic testing, laboratory research.
Preface In the engineering fields of exploration and the use of substrate thermal application, high temperature nuclear waste treatment, underground coal mines and gas explosion, underground rock engineering, post-disaster reconstruction, etc., there are inevitably concerns being raised about the high temperature effects on the stability of rock formation confinement.
However, the complexities of the underground conditions of the confined rock formation stress condition and having been affected by the original rock stress, geo-technical structures, rock vector characteristics and uneven nature, jointed crevice development, the geometrical shapes and the types of supports of the formation confinement, the above mentioned method cannot satisfy the actual condition of the engineering works.
The ultrasonic method, with the convenience and ease in its application, its non-destructive nature does bring forth the attention of the engineering/technology sector.
[6] Compiler of Ultrasonic Flaw Detection: Ultrasonic Flaw Detection(1980.4) [7] Zhao Mingjie, Wu Delun: Study on the model and experiment of ultrasonic characteristic of rock under uni-axis load, Journal of Geotechnical engineering, Vol.25, No.5, 1999.9, p540-545

The design of the C section of the main line of pipe diameter of Dongyue road Xi'an city drainage engineering is 3000 mm, the length of pipeline is 2863 meters.
The design of the C section of the main line of pipe diameter of Dongyue road Xi'an city drainage engineering is designed by Xi'an municipal engineering design and Research Institute and constructed by Xi'an municipal road and Bridge Construction Co.
Pipe jacking machine engineering machinery articles of Patent Information [J].
Engineering machinery, 2008,32 (12): 33-39 [7] Huang Qingfei.
Civil Engineering Journal, 2010,43 (3): 88 ~ 91