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The Research and Comparing test on Calcium Carbonate-Acid water glass grouting material XIAO Zun-qun1，2,a,XU Cai-yun,3,b WU Guo-dong4,c 1School of Environment and Civil Engineering ,Wuhan institute of technology,Wuhan 430073 China 2 China Petroleum Pipeline Scientific Research Institute, LangFang, 065000 China 3 Changjiang River Scientific Research Institute,Wuhan, 430014 China 4 Shandong Provincial Department of Land and Resources, JiNan 274200 China axiaozunqun@126.com,bxucaiyun860920@163.com,cwuguodong@163.com Key words: water glass;grouting;material;gelation;strength Abstract: The change law of gel time of calcium carbonate-acid water glass grouting material with the content of calcium carbonate is researched in this paper.
Finally, the contrast test of the water glass-glyoxal is done, which is the preparation for the subsequent engineering application.
It has been preliminary applied to some underground fine sand strengthening engineering in our country [1-3].
The effect of different modulus and solid content of acidic water glass on compressive strength of fly ash-based mineral polymer is investigated in detail by DAVIDOVITS J[6].The process of compound grouting treatment at foundation by using the combined HS acidic water glass material in the cutting pollution dam curtain grouting engineering is studied by Chen Hao [7].
[5] Xue LI.Journal of Chemical Industry and Engineering(in Chinese).2 (2007)503-505

Settlement Control and Impact Analysis of the Subway Shield Under-Passing Beijing-Shanghai High Speed Railway Bridge Hua Peng1, Jia Chong Wei1 and Bin Zhang2 1 Beijing Jiaotong University,School of Civil Engineering,Beijing 100044,China 2 Beijing Railway Administration,The Institute of Engineering Management,100860,China 1hpeng@bjtu.edu.cn Keywords: Isolation pile,Shield tunnel,Under-passing construction,high speed railway bridge, Settlement Control Abstract.
Based on the Beijing subway tunnel go through the Beijing-Shanghai railway bridge section engineering examples, for the first time to shield under through the high speed railway caused the bridge pier settlements are analyzed.
Considering the high railway requirement of the Beijing-Shanghai high-speed railway, combine the present situation of this engineering, the mainly given control indicators are shown in Table.1.
(4)It is suggested that taking isolation piles reinforcement protection measures to similar engineering like shield under crossing high-speed railway bridges, and combining manual monitoring and automation monitoring to the existing high-speed railways
Reference [1] J.Bian,L.J.Tao and J.Guo:The ground settlement regularity caused by shield tunnel excavation[J],Underground space and engineering, Vol.1(2005) No.2,p,247(In Chinese) [2] P.L.Lv,S.H.Zhou:The line settlement regularity analyzing caused by shield tunnel under crossing the main railway line in soft soil area[J],China railway science, Vol.8(2007) No.2,p.12(In Chinese) [3] X.Z.Wu:The protection technology of shield tunnel construction[J],Tunnel construction(Suppl.2),2006,26(2):30-32(In Chinese) [4] F.X.Zhang,H.H.Zhu and D.M.Fu:Shield Tunnel[M],Beijing:Communication Press,2004

Slope stability estimation is a complex engineering problem involving many factors.
Introduction Slope stability analysis and evaluation has been one of the most important research fields of slope engineering.
It is difficult to estimate the slope stability accurately because of the complexity of the physical system itself and uncertainties encountered in geotechnical engineering analysis and design [3, 4].
Acknowledgments The authors wish to thank the Changjiang Waterway Engineering Bureau for the financial support of this research.
Civil.

Strength Criteria and Numerical Experiment OLEG KABANTSEV National Research University Moscow State University of Civil Engineering, 129337, Russia, Moscow, Yaroslavskoye shosse, 26 email:ovk531@gmail.com Keywords: masonry, brick, mortar, modeling, numerical methods, design model, stress-and-strain state.
Mesoscopic modeling of failure in brick masonry accounting for three-dimensional effects (2005) Engineering Fracture Mechanics, 72, pp.1238–1253
[Structural behavior analysis taken into account changes of design model] (2014) Magazine of Civil Engineering, 5, pp. 15–26.

Stress level prediction in axially-loaded timber beams using resonance frequency analysis: A pilot study Thomas Lechner1,a, Steve Laux2,b and Daniel Sandin3,c 1 Chalmers University of Technology, Dept. of Civil and Environmental Engineering, SE-412 96 Gothenburg, Sweden 2 Eidgenössische Technischen Hochschule (ETH), Inst. of Structural Engineering, CH-8093 Zürich, Switzerland 3 MIDAPRO AB, P.O.
Laux: Estimation of axial load in timber beams using resonance frequency analysis, Master's Thesis, 2012:60, Civil and Environmental Engineering, Chalmers University of Technology, Gothenburg, 2012.

Beijing Green Building and Energy-saving Technology Key Laboratory，Beijing University of Civil Engineering and Architecture，Beijing 100044 China ； 2.
During research and engineering, limestone powder is added into concrete as fine concrete mineral powder admixture, with finer fineness and high volume.
China Civil Engineering Journal, 2010(S2)

Despite the current development of autonomous modal analysis procedures in many scientific centers, the total independence of an engineer’s interference is still problematic in practice.
Last tests were performed to examine the operation of the method for a complex civil engineering object, and check the effect of humidity on the efficiency of the damage detection method.
Of course ambient temperature for the civil engineering object can change in bigger range than 11OC but one of the assumptions made during SHM system designing was, that it should be equipped with modal filter bank.

Mega-Frame Structures Duan Hong-xia1, a, Zhang Shang2,b 1, 2 Faculty of Civil Engineering, Suzhou University of Science and Technology, Suzhou, China adhx187@163.com, bzhangshfan@163.com Keywords: Reinforced concrete mega-frame structure, Elastic-plastic time-history analysis, Capacity design, Amplification coefficient of column moments Abstract: This paper explores the design method of several typical mega plane frames, with the variables being the combination of varying amplification coefficient of moment at bottom sections of ground floor columns of the secondary frame on the main beams.
[6] Yang Fu, Li Yingming, Lai Ming, A new method for selecting inputting waves for time-history analysis, China civil engineering journal, 2000, 33(6) , p.33-37
[7] Yang Hong, Wang Zhen, Wei Feng, et al., Effect of amplification of moments at the bottom section of columns on seismic behavior of RC frames, World earthquake engineering, 2002, 18(4), p.66-72.

Influence of Cracks on the Safe Functioning of Building Structures VYROVOY Valerii1,a, KOROBKO Oksana1,b*, ANTONIUK Nadiia1,c and ZAKORCHEMNY Yuryi1,d 1Odessa State Academy Civil Engineering and Architecture, Department of Production of Building Products and Constructions, Didrihsona st. 4, 65029 Odessa, Ukraine avyrovoy@ukr.net, bokskorobko71@gmail.com, cantonuk@ukr.net, dzakorchemny@gmail.com Keywords: structure, functioning, safety, cracks, internal surfaces of section, residual deformations.
Sarbijan,  Effects of loading, geometry and material properties on fracture parameters of a pavement containing top-down and bottom-up cracks, Engineering Fracture Mechanics, 166 (2016) 182-197
Marushchak, The Effect of Mechanical Activation on the Properties of Hardened Portland Cement, International Scientific Conference EcoComfort and Current Issues of Civil Engineering, 2020 378-384.

Analysis of Permanent Lining of Branisko Tunnel CHABRONOVA Jana1, a *, BEDNAR Marek2, b and SNOPKO Jan2, c 1Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Department of Geotechnics, Radlinskeho 11, SK-810 05 Bratislava, Slovakia 2TAROSI Construction & Consulting Company, Madachova 33, SK-821 06 Bratislava, Slovakia ajana.chabronova@stuba.sk, bbednar@tarosi.sk, csnopko@tarosi.sk Keywords: permanent lining, geotechnical monitoring, cracks in lining, static calculation Abstract.
Fig. 2 Primary lining of escape gallery of Branisko Tunnel The secondary lining as well as primary lining was mounted by two civil engineering companies (Vahostav, Hydrostav).
Based on results of detailed engineering-geological survey, the ground mass has been divided into 5 quasi-homogenous sections.