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Numerical simulation method of safe distance between concealed karst cave and tunnel based on energy catastrophe Yongbiao Lai 1,2, a, Mengshu Wang 1,b and Chenguang Bai 2,c 1 College of Civil Architecture and Engineering, Beijing Jiaotong University, Beijing 100044, China 2 China State Construction Engineering Corporation Technical Center, Beijing 101300, China alyb3258@126.com, bdxgc@sina.com, cbaichenguang@cscec.com Keywords: Concealed Karst Cave, Safe Distance, Energy Catastrophe, Numerical Simulation.
Non-linear science catastrophe theory developed from 1970s and widely applied in geotechnical engineering[1-9].
Xu Xiaohe: CHINESE JOURNAL OF ROCK MECHANICS AND ENGINEERING .Vol.9 (1990), p.100~107
[4] Qin Sichun，He Huaifeng: HYDROGEOLOGY﹠ENGINEERING GEOLOGY.Vol.5 (1995), p.17~20
[5] Xu Qiang, Huang Runqiu: Journal of geotechnical engineering.Vol.19 (1997) , p.25~29

Reliability Analysis and Comparative Study of Ordinary Concrete and High Performance Concrete Filled with Steel Tube under Axial Compression Messaoudene Lydia1,a*, Kernou Nassim1,b 1Department of Civil Engineering, Faculty of Technology, Laboratory of Construction Engineering and Architecture (LGCA), University of Abderrahmane Mira Bejaia, Targua Ouzemour 06000, Algeria.
The CFST composite column has become the preferred form in the field of civil engineering.
Zhong, Load-Bearing Capacity of Concrete-Filled Steel Columns, Journal of Civil Engineering And Management. 15.1 (2009) 21-33
Belakhdar, Adaptive response surface by kriging using pilot points for structural reliability analysis, IOSR Journal of Mechanical and Civil Engineering. 9.5 (2013) 74-87
Doctoral thesis, Sao Carlos School of Engineering, University of Sao Paulo, 2008.

Department of Civil Enginering ,East University of Heilongjiang , Xuefu Street 331, Nangang District ,Harebin150086, Heilongjiang,China 2.Harbin Songbei Construction Safety Supervision and Management Station,Songbeiyi Street 38,Songbei District,Harbin150028,Heilongjiang,China; 3,Shanghai Baoye Group Co.Ltd.
It is widely used in various building works and some large-span bridge engineering, and has become the mainstream and trend in the development of construction industry at home and abroad.
This paper, combining with the construction of steel structure engineering of Harbin theater is to explore construction technology and technical measures of steel structure under the negative temperature in northeast China in winter.
Practical hands-on training is conducted in accordance with the actual site welding thickness, material, form and weld groove orientation to accommodate on-site soldering conditions, to ensure the quality of engineering entities welding.
In accordance with the provisions of the code for construction and acceptance of building corrosion engineering, the steel surface temperature must be higher than the air temperature above the dew point3 ˚C.

The paper, based on expressway cases of foundations reinforcement by compaction grouting, presents the results of comparative test among the different traditional engineering method, including soil test, in-situ test, deflection test.
Meanwhile the soil between grouting drill is compressed，its density will be raised and its stability will be strengthened.[2] Engineering practice shows that grouting reinforcement technique is one of effective method for protescting highway subgrade from asymmetric settlement.
Grouting Construction for Civil Engineering and Effectiveness Detection, Tongji University Press, Shanghai, 1998. 214-216
Journal of Transportation Engineering, 2006, Vol. 132(9),742-750
Characteristics on the Dispersion of Rayleigh Wave Caused by a Low-velocity Interlayer, Chinese Journal of Engineering Geophysics,2005,3(2),208-215

New technologies for Highway alignment under complicated environmental conditions in mountain areas Chuandong Gao School of Civil Engineering & Architecture Chongqing Jiaotong University, Chongqing, P.
The concept of design that people want to reduce disasters of highway engineering at the source location is gradually implemented.
Application of 3DGIS to Highway Design Engineering.
Journal of transport science and engineering.2009,3:96-100
Highway Engineering.2008.10:85-87

Experimental Study on Mechanical Behavior of the Intact Loess Yan Wang1, a, Shanhua Xu1,b , Yuding Hu1,c 1School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; alianhua258@163.com, bxushanhua@163.com, chuydjg@xauat.edu.cn Keywords: intact loess, water content, mechanics characteristic, over-consolidated Abstract: As a “special earth”, the water sensitivity of loess is an improtant factor influencing its mechanical characters and engineering properties.
The Past，Present and Future of the Research on Mechanical Characteristics and Application of Loess，Chinese Journal of Underground Space and Engineering,1999,19（4）,In Chinese
，Chinese Journal of Geotechnica Engineering，2006，28（1），In Chinese
Chinese Journal of Geotechnica Engineering，2006，28（2）：256-259，In Chinese
E Engineering & Materials Science，2004，34（11）：1283-1299，In Chinese.

Analysis of the Potential of Seismic Stability for the Southern Region of Tangshan Based on ArcGIS Chengcheng Li a, Xiaoming Yuan b Key Laboratory of Earthquake and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, 29 Xuefu Road, Harbin 150080, China alichengcheng113@126.com, byxmiem@163.com Keywords: ArcGIS, site seismic stability, five factors, overlay method, digitalization and visualization.
China Academy of Building Research has made a report named “The research of geology of earthquake engineering in intense seismic area of Tangshan”, which systematically analyses and summarizes the problem of geological concerns in various sites and foundations, including seismic faults, earthquake liquefaction, ground-motions, damage analysis of the seismic, and geological mapping of earthquake engineering in 1976 [2].
In order to establish the database, five factors are considered, including fault zone, engineering geological condition, hydrogeology condition, dynamic coefficient and site category.
Acknowledgements This research is supported by Fundamental Research Funds of Institute Engineering Mechanics and Earthquake (2013B03) and the Chinese National Science Foundation (51278472, 41272357, 51208477).
Doctoral Dissertation, Department of Civil Engineering, Brigham Young University, Provo, Utah, Technical Report CGE-92-1, 129p [8] Michael J.

Numerical Simulation of Safe Distance between Concealed Karst Cave and Tunnel Based on Shear Strength Reduction Method Safety Factor Catastrophe Yongbiao Lai 1,2, a, Mengshu Wang 1,b and Xinhua You 2,c 1 College of Civil Architecture and Engineering, Beijing Jiaotong University, Beijing 100044, China 2 China State Construction Engineering Corporation Technical Center, Beijing 101300, China alyb3258@126.com, bdxgc@sina.com, c78717715@qq.com Keywords: Numerical Simulation, Concealed Karst Cave, Safe Distance, Shear Strength Reduction Method, Safety Factor Catastrophe.
The safety factor of different distance between concealed karst cave and tunnel can be obtained using strength reduction finite element method numerical calculation with the finite element solution non convergence as the standard rock damage, then compare the safety factor of different distance, the catastrophe of safety factor corresponding to the distance is the safe distance between concealed karst cave and tunnel, and the plastic zone of rock stratum between concealed karst cave and tunnel is reaching run-through state, which is verified by engineering example.
For currently engineering design between concealed karst cave and tunnel is often half experience based on the previous engineering experience and giving a bigger safety stock, many engineering example, seldom theoretical research.
Safety factor of distance between concealed karst cave and tunnel Currently there are two main types of geotechnical engineering safety factor definition: overload reserve safety factor and strength reserve safety factor.
Engineering example Selecting a concealed karst cave at the lateral of the tunnel located in China YiWan railway lines as an example, concealed karst cave span is 13 meters, Karst cave span ratio is 1.1, 780 depth, rock mass density is 21.6KN/m3, poisson ratio is 0.33, elastic modulus is 6.2GPa, internal friction angle is 33 °, the Calculation model is shown in fig.1 [8].

Compaction Temperature’s Influence on the Pavement Performance of Warm Asphalt Mix with Different Matrix Guangshan Zhua, Ling Yub School of Civil Engineering, Shenyang Jianzhu University, 110168, Shenyang, Liaoning, China ajiandazgs@126.com, byulingsy@163.com Keywords: Road engineering; Warm mix asphalt (WMA); Sasobit; compaction temperature; pavement performance Abstract.
For that reason, the air void rate, dynamic stability and flexural-tensile strain of Sasobit mixture of 3 different matrix asphalts at different compaction temperature is studied through laboratory tests in an effort to discover the influence rule compaction temperature has on pavement performance and provide guidance for engineering practice.
Key technical indexes of matrix asphalt all meet with Asphalt and Asphalt Mixture Testing Regulations of Highway Engineering(JTG E20-2011)[5].
Compaction Temperature’s Influence On High-Temperature Performance An engineering test method that simulates actual wheel load forming pavement rut to examine the high-temperature performance of WMA and test temperature is at 60˚C .
[5] JTG E20-2011, Standard test met hods of bitumen and bituminous mixtures for highway engineering.

The sport buildings are different from the ordinary civil buildings; they not only have functional requirements, but also have landmark and aesthetic requirements.
In 1995 membrane structure was used in Fangshan natatorium (span 33m, area 1100m2) and Anshan COA natatorium (span 30m, area 1000m2) , they were the first engineering application in China, they symbolized that membrane structure engineering construction were started in China.
"Water Cube" is the largest area, most difficulty, most complex air-supported membrane system engineering in the world.
Engineering application and development prospect of membrane structure in China [J].
Engineering Construction and archives, 2002.3 [5] Information on http://baike.baidu.com/view/172159.htm?