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What has gained that served as scientific bases and technical guidance for underground cavities extending and reconstruction engineering. 1 Introduction In recent years, due to the development of economy, society, science and technology, many engineering problems caused by the extending of underground cavities frequently appear in areas such as water conservancy, transportation, warehousing .most of the over-expanded type is used for extending of underground engineering (Figure 1) .using this construction scheme, is small disturbanc of surrounding rock, lower displacement value, easy of application.of the surrounding rock by this method of extending, the original lining in instability of surrounding rock in the aftermath of the demolition of the possibility of more, need to temporary support treatment, will make the project cost have increased.
In computing, material constitutive relation of surrounding rock Drucker - Prager (D, P) model is adopted, to compute the cavity structure and formation in the process of extend the nonlinear deformation characteristics.
Journal of geotechnical engineering,1998,20

In addition to ensure the quality of engineering, the construction process requirements are as follows: ①Shorten the construction period and reduce costs. ②Make full use of the excavated material and reduce the earthwork quantities of a second operation. ③Earthwork transport machineries should entry and exit orderly to avoid venues confusion.
Journal of Construction Engineering and Management[J],2006,(7):750-758
Corrosion Science[J],2005,(47):2353-2360

Introduction Optical fiber cable belongs to the flexible material.
Reference [1] Xinjie Zhang, zhedong Xie, "Used for the study of precision displacement measurement of video extensometer system"[J], Chinese Journal of Scientific Instrument, Jun 2011 [2] Zhanfu Wang, Liping Xie, "Design of Non-contact Video Strain Measurement System"[J], Tool Engineering，2011,45(8):91-94 [3] Weiguo Zhang , Bin Wang, Hongye Chen, Guangzhe Liu, "The Design of Reality Video Images Processing System Based on Digital Image Processing Technology"[J], Natural Science Edition, Sep.2011 [4] Qingyun Dai, Yingling Yu, "The advanced of mathematical morphology in images processing"[J], Control Theory and Applications, 2001, 18(4):479-481 [5] LanlanChen, Duyan Bi, "App1ication of mathematical morphology in image processing"[J], Modern E1etronical Technology, 2002, (8):18-20

In practical engineering, we cannot guarantee the geo-membrane to completely cover the slope, which is affected by the construction; the material properties lead to geo-membrane surface appear holes, so the essence of function is cut down.
Acknowledgements This work was financially supported by the science and technology project of Jiangxi transportation department (2013C0006).
Canadian Geotechnical Journal, 1194, 31:533-546.

Structural dimensions and material properties of waveform generator greatly influenced the accuracy of the test device.
Journal of electric science and technology, 2008, 23(1): 60-65.

Because of small size of the fingers and relatively big forces, the fingers’ material should possess certain strength, such as stainless steel.
Submitted to Chinese Journal of Mechanical Engineering, Vol. 40(2004), p. 115 [2] Kai Xu, Wenqing Yin and Qian Zhang: J.
Submitted to Hubei Agriculture Sciences, Vol. 16（2012), p.3615

(2) ─Hole wall thickness;p—Channel maximum working pressure;d─Channel diameter of pressure oil;n─Safety factor;─Material tensile strength of the valve block.
An hui university of science and technology,Master's thesis, 2005(In Chinese)
[4]Fu Linjian,Wei Jianhua,Qiu Minxiu.Dynamic Characteristics of Large Flow Rating Electro-Hydraulic Proportional Cartridge Valve[J],Chinese Journal of Mechanical Engineering,2008,21 (6):56-62

Its main advantages are material and geometrical independence, flexible measurement area, spatial visualization of the results, possibilities of measurements in arbitrary location of observed area and simple processing of obtained data.
Hagara, Experimental modal analysis performed by high-speed digital image correlation system, Measurement: Journal of the International Measurement Confederation, 50(4), 2014, 78-85
Rizwan, Introduction to Numerical Analysis using Matlab, Infinity Science Press, 2008.

At Transdisciplinary Fluid Integration Research Center, Institute of Fluid Science, Tohoku University, studies of propulsive impulse generation using three CO2 TEA lasers are being conducted.
Due to focusing the laser beam, the beam intensity is high enough for the projectile material to ablate.
Takayama: Journal of Propulsion and Power, Vol.19, (2003), p. 190 [13] A.

Design of injection mould for back shell of radio Chunwei Wang1, a, Xiaofeng Mao1, b, Zhuoqiang Mo1 1School of Material Science and Engineering, Guangxi University, Nanning , Guangxi, 530004, P.R.China awcw6456@126.com,bgyzx98gb@163.com Key word: Back shell of radio; Injection mould; Slider Abstract.
The former has difficulties in removing gate freezing material, and the latter is much more complex than the previous structure.
The separable contact surface that is used to take out products and freezing material is called parting surface.
SM1 was selected to be the concave die material.
Journal of Materials Processing Technology, Volume 171, Issue 2, 20 January 2006, Pages 259-267