bluuebunny/crossref_metadata_2025 huggingface dataset:
Strategy Research of Landscape Construction of Green Village Settlement — Take Ansai as an Example
Authors: Cui Wen He , Chen Qian Yu , Li Yu
Published: October 2011

In this paper, dry farming area in northern Shaanxi unique geographical and natural environment and industrial restructuring brought about great changes in the background. Analyzed and summarized in Ansai area landscape to the status of rural settlements. From a rational land use and agricultural landscape planning, rural communities to create green, ecological environmental protection three aspects of green rural landscape to create a strategy, And proposed the establishment of green rural landscape of the "production - Living - ecology" compound operation mechanism.
Structural Reliability and Human Error of Reinforced-Concrete Building during Construction
Authors: Yuan Xue Xia , Jin Wei Liang
Published: October 2011

In view of the significant failure modes of formwork-supporting system and reinforced- concrete member, the reliability analysis model of time-dependent system affected by human errors during the construction of typical multistory reinforced-concrete buildings was developed. Human Reliability Analysis (HRA) method was applied to simulate the error rates and error magnitudes of the reinforced-concrete members and the formwork-supporting system, and human reliability models were developed, two cases for error-free case and error-included case were considered. Furthermore the check emphasis of formwork-supporting system was pointed during multistory building construction.
Combination of Coal and Rock Uniaxial Compression Test Image Processing of CT
Authors: Guo Dong Ming , Zhang Yi , Li Gui He
Published: October 2011

The use of industrial CT systems, and special loading equipment, combination of coal and rock under uniaxial compression load test real-time CT scan obtained at different loads under various stages of the CT images. Using digital image processing technology to coal combination of the CT image gray stretch and pseudo-color enhancement to improve image contrast, highlighting the cracks and pores of the edge information. To establish a combination of coal to the coal from the rock micro-crack interaction and its associated macro-deformation, further study coal - roof and floor damage and the impact of mechanical systems to the mechanism of pressure to provide experimental basis.
Crack Control Technology of Massive Concrete with Thick Foundation Floor
Authors: Li Da Hua
Published: October 2011

In the first phase of the project of AnHui Province New Broadcasting Center, the CT-1 foundation of tube cushion cap in main building is 3.5m in thickness which belongs to massive concrete. In order to prevent the crack caused by the excessive hydration heat in massive concrete, the project take several actions including optimizing dosage of cement concrete mixture, setting post-cast strip, cant layered casting and temperature monitoring after concreting, etc. All these actions regulate the concrete temperature and restrain crack generation successfully, while insuring the construction quality of massive concrete cushion cap.
Development of Foil Thrust Bearings with Simple Structure for Micro Turbines
Authors: Zhou Quan , Hou Yu , Chen Ru Gang
Published: October 2011

Because of the low power loss and high stability, foil bearings are suitable lubrication components for high speed rotational systems. At present, the foil bearings used in actual applications almost have complicated structure and are hard to manufacture. In this paper, two kinds of foil thrust bearings with simple structure are presented. Configurations of these two foil thrust bearings are introduced; meanwhile, the load capacity and running stability are also tested in a high speed micro turbine. It is shown that viscoelastic supported foil thrust bearing has higher load capacity and hemisphere convex dots supported foil thrust bearing is more stable in high speed operational condition.
Analysis on Contact Pressure Distribution and Design Model of Foundation Reinforcement
Authors: Wu Er Jun , Jiang Wei
Published: October 2011

With an independent foundation reinforced applying section-enlarging plan as an example, the contact stress distributions between foundation and groundsill in 6 conditions were analyzed by finite element method and the pattern of stress distributions were discussed. Variable parameters include values of load on foundation and compression modulus ratio K of new and old foundation. The result showed the ratio of old foundation’s contact pressure to that of new foundation was about equal to the K. Based on the analysis results, consider the two times loading effect, the force diagrams of foundation strengthened were presented.
The Finite Element Analysis of Anti-Seismic Performance for the Plate - Column -Light Steel Structure
Authors: Xing Guo Qi
Published: October 2011

The finite element model was established for the test model of the plate - column -light steel structure according to the application of SAP 2000 and the seismic wave was input in the model , through the analysis of earthquake response, the analysis data of the finite element model was close to the results of the test data,so the finite element model was reasonable.
Numerical Simulation for Smoke Flow of the Underground Railway Tunnel Fire
Authors: Li Li Xin , Zhao Lan Ying
Published: October 2011

The characteristics of tunnel fire are analyzed, and the numerical simulation of some tunnel of Shenyang railway is made with the CFD software star-ccm+ 5.02, which applies the field modeling method. A comprehensive understanding of tunnel fire characteristics and flue gas development are obtained, through analyzing the concentration field and temperature field, which may provide the theoretical background for evacuation design in tunnel fire. The effective measures of fire rescue and evacuation are also put forward.
Research on Space Simulation Methods for High-Pier Long–Span Pre-Stressed Continuous Rigid Frame Bridges
Authors: Zhao Jian Xun , Feng Wei , Lei Dan
Published: October 2011

Along with the fact that more and more high-pier long-span bridges have been constructed in China, especially in western regions of China, the issues relevant to construction safety, load capacity have attracted duly attention of many bridge engineers. Taking Xushuihe Super Bridge of Yumenkou - Yanliang Expressway in Shaanxi Province as an example, the limited space element models including phase construction,concrete box beams, thin - wall hollow piers, pre-stressed main beam tendon, high piers, and regular reinforcement are proposed to be established in this paper. Thoughts and methods are developed for analysis of the space simulation during overall-process construction and operation, and references are given for further research on this kind of bridges.
Stability of No 7 Landslide Located at Ciha Gorge under the Condition of Reservoir Water Level Rise
Authors: Song Yan Hui , Wang Ying , Huang Min Qi
Published: October 2011

Engineering geology characteristics of No. 7 landslide located at Ciha Gorge is described and shear strength of the slip band soils is determined. Based on the above, unbalanced pushing force method is used to calculate the stability factor of the landslide the under different work conditions. It shows that the influence of the reservoir water level rising on the No. 7 landslide mainly includes two points: (1) water makes the shear strength of slip band soils reduced and thus result in the reduction of the stability factor; (2) the rising of reservoir water level also exerts water pressure to the surface of landslide body, and this is beneficial to landslide stability. Calculation results show that with the rising of reservoir water level the stability factor will experience beginning’s reducing followed by later increasing. The minimum stability factor in the process of impounding is 1.05 and it will be 1.08 when reservoir water level reaches to normal impounded level. This shows that No. 7 landslide will maintain elemental stability status in the all process of impounding.
The Study on Seismic Reliability of CS Panel Structure
Authors: Li Yan Bo , Xu Chuan Fu , Wang Xue Yan
Published: October 2011

CS Panel Residential Structure is a new type of structural system investigated and manufactured for the requirements of wall reformation and residential industrialization.Now set up two finite element models on the basis of the two types of three storeys CS panel structure experimental models (including tectonic columns or not ) with the ratio 1:2.8 that designed before. Then analyze the random seismic response of the two types of CS panel structure under the action of ground motion acceleration power spectrum using the spectrum analysis module of the finite element analysis software ANSYS.Based on the first excursion failure theory and stochastic vibration theory, dynamic reliability of the CS panel structure subject to different seismic intensity is calculated and compared, the effect of the edge component is summarized using structure seismic response of random statistic.
The Land Subsidence Characteristic Following the Termination of Groundwater Pumping to Different Aquifers
Authors: Ma Feng Shan , Wei Ai Hua , Ding De Min , Guo Jie
Published: October 2011

Land subsidence is particularly critical in Tanggu, due to its flat-lying topography and large thickness of the soft clay. The subsidence up to 140mm/year reached its most critical state in the mid-1970s. To mitigate this hazard, some strict measures resulted in a drop in groundwater use, especially banning the exploitation of groundwater, were exerted. Accordingly, the subsidence indeed had a decreased trendy in this time interval. Meanwhile, a GPS-based monitor data also revealed that light uplift phenomena emerged in some individual monitor series. For discussing the relationship between this abnormality and the termination of groundwater, and analyzing the deformation characteristic after exerted this measure, this article with the aid of numerical method predicts the land subsidence. The result reveal that the settlement is ceased and obvious uplift phenomenon only emerges in the central region of the stop mining well, due to various supply resource the water level could have a rapid recovery after banning. Meanwhile, own to the time-dependant behavior of the soft layer and clay aquitard, the most region far form the ban well also emerges subside, but the subsidence rate switches to decreased trendy with time. Generally, the subsidence or uplift is stabilized in a finite time interval after the termination of groundwater pumping. Meanwhile, due to the different hydrogeologic and stratum conditions, the stabilized subsidence and uplift value are also different from unit 2 to unit 5.
Study on the Equalization and Differentiation Configuration of County Infrastructure — Taking the Urban-Rural Integration Planning in Xunyi County as an Example
Authors: Wu Xiao Hu , Miao Guo Hui
Published: October 2011

For a long time, the Chinese development direction of emphasizing urban area but despising rural area results in the great differences in configuration standard of regional facilities, large gap between urban and rural facilities and low level of urbanization, and limits the materialization of equalization between urban and rural public facilities, which is especially obvious in the western region of China. Western cities and countryside are always of poor ecological environment, small scale of towns, decentralized layout, comparatively backward economy and limited construction capital, therefore, posing great challenge in the face of urban-rural integration, in particular the infrastructure. Directed towards this, this paper takes the practice of urban-rural integration planning in Xunyi County as an example, and brings forth new train of thought for advancing the implementation of infrastructure equalization in counties.
The Reconstitution of Landscape Pattern at Master Planning Level in Ankang City
Authors: Huang Ming Hua , Wang Yang , Shi Xiao Nan
Published: October 2011

The author’s observation on the new urban form of Ankang city grounded on the landscape pattern by analyzing and evaluating the present conditions of land resources, historic cultural attractions, and natural landscape from ecological perspective, finding out the problems in the current construction of urban landscape environment with consideration on local special landscape theme. Besides, the authors emphasized and constructed the landscape patterns at master planning level by layout of city green corridor, preservation of the wetland as the urban corn and improvement of the urban green space system in combination of history, culture and natural environment, urban space and urban spirit, as well as history and future construction.
Thoughts and Measures for the Development of the New Countryside in the Ecological Belts of Hangzhou
Authors: Wang Yue , Zhang Yue
Published: October 2011

This essay analyses and researches the current situation and demands of new rural construction in Hangzhou ecological belt, and the problems existing in the space and industry aspects, explores the evaluation system of new rural development in ecological belt, thus gives the new rural construction strategies and advices on the aspects as follows, space construction leading, industry development orientation and monitor system, in order to realize the protection of ecological belt and the organic coordinated development of new socialist countryside, then advance the ecological belt protection and the new socialist countryside construction plan.
A Synergy Analysis on Industry Structure and the Science & Technology Progress in Shanxi Province
Authors: Liu Shu Ru , Wang Xiao Wen
Published: October 2011

With the development of science and technology, the economy increase gradually from relying on the labor, the investment of capital and the low level overlapping production to growing by the science and technology progress to achieve reasonable allocation of economic resources to improve the productive forces. The upgrading of industry structure and the progress of science and technology are supplementing each other. This paper evaluated the development of the industry structure system and the progress of science and technology system separately by the principal component analysis, then using the regression analysis to achieve the quantitative analysis and qualitative analysis of the synergy of the two systems. This paper also uses the data analysis to achieve the cooperative development situation between industry structure and the progress of science and technology system of Shanxi province.
The Spirit Myth of Conceptual Buildings
Authors: Zhu Li Jia , Hu Wei Ping
Published: October 2011

In post-modern context, conceptual buildings appear post-modern symptoms. What is its identity What do modern and post-modern mean to architects How do people concern structures The fowllowing thesis are trying to solve all these questions.
Burning Coal — The Value and Protection of a Living Industrial Heritage Site: Anyuan Modern Coal Mine
Authors: Cai Qing , Yao Tang
Published: October 2011

Anyuan Coal Mine is an important part of Chinese modern coalmine industrial heritage. The thesis discusses the components and current situation of the heritage, elaborates its valuation, and studies its preservation strategy.
Innovation Research on Eco-Planning of Heilongjiang Coal-Exhausted Town Subsidence Area
Authors: Sun Ming , Li Jie , Qin Xin
Published: October 2011

Because of its special development, Heilongjiang coal city have problems of city decline and marginalized, which directly affects the whole function of urban space, one of the most prominent problems is the deterioration of subsidence area. At present, the coal town subsidence area ecological restoration and reconstruction is coal town planning research hot spot. The article based on the resource exhaustion town theory as a foundation, to Heilongjiang coal town subsidence area, as empirical research object, through the depth of subsidence area problems and hazard analysis, puts forward subsidence development pattern and countermeasures. Through the thinking of coal town special land ecological adjustment of spatial structure, it clarifies the feasibility of coal optimization idea, for cold coal town subsidence area development to provide certain reference.
Research on the Residential Model of Providing for the Aged and the Habitation Environment in Xi’an on the Background of Population Aging
Authors: Bai Ning , Wu Su
Published: October 2011

The trend of population aging is growing obviously in China, but there is a great gap between the construction of habitation environment and its social needs. This paper based on researching aging society characters in Xi’an, investigates the senior citizen habitation environment status quo and existing problems, studies the residential model of providing for the aged, and puts forward giving first place to “providing for in home”, combining with community support service, and supplement with society service the aged. This paper also puts forward the theoretical frame about senior habitation environment’s location and planning, the setting of senior house, the setting of service institution and so on.
Urban Structure Morphology Oriented by River System — Example of Nanning Watertown Practice
Authors: Rao Huan Huan , Huang Yao Zhi
Published: October 2011

The rivers are the important environmental factors to influence and restrict the urban structure morphology. Based on reviewing the relationship between rivers and urban structure at different historical period, analyzing the problems about constructing the spatial structure of the water net city in china, the article discusses the method of the urban structure morphology in water net cities. With the example of Nanning development, analyzing natural environment and space structure on the basis of water net feature, the article proposes spatial structure morphology idea and method in order to provide reference for city development and active interaction.
Analysis of Risk of Commercial Real Estate Based on Multiple Attribute Group Decision-Making
Authors: Liu Ya Chen , Liu Wan Bo , Sun Meng Xiao
Published: October 2011

Abstract: Commercial real estate is the real estate primarily used for commercial. This paper proposes using the multi-attribute group decision method to identifying the risks of commercial real estate. By calculating the weight of each risk attributes to reflect the degree of influence of different decision makers and risks on the results,and to deduce the degree of similarity and diversity of each decision makers. It introduces the concept of entropy to calculate the weight of each risk attributes, infer the integrated decision-making value of very risk factors, and arrange every risk in order. Finally, it identifies the feasibility. Introduction Commercial real estates are real estates for commercial purposes classified according to use. They include retail shops, supermarkets, community business, commercial plazas, shopping malls and so on. Compared with residential real estate, commercial real estate has larger profits. However, high profits always accompanied with high risk. Developers can obtain the value of compensation and benefits after sold residential real estate, while the payback periods of commercial real estates are longer, even extended to the entire project duration, and are affected by various factors. The risks of commercial real estate including policy risk, funding risk, operational risk, urban planning risk, technology risk, natural risk, market supply and demand risk, capital risk and so on. Previous studies based mainly on qualitative research[1-3], but quantitative analysis of risk identification is less. Based on this, this paper proposes a method of multiple attribute group decision.
The Relation between Structural Stress and Cladding Ice Thickness of Transmission Tower on the Condition of Vibrate
Authors: Xue Jia Zhu , Zhi Xiang Cao , Chi Yv Zhang
Published: October 2011

Transmission tower security is the first requirement of intelligent power grid and exploring transmission tower line failure mechanism is a technical difficulty under the condition of cladding ice. The wind vibration model and relation between internal force distribution and cladding ice thickness of transmission tower system are researched in this paper.Numerical simulation results show that ice cover thickness increases with insulator string tension distribution changes, and nonlinear characteristics of cladding ice thickness and the distribution of stress transmission tower significantly increasing changes.The numerical results provides certain theoretical foundation for recognizing the failure mechanism of cladding ice transmission tower under complex load condition.
Modeling of Tension-Stiffening Behavior of Reinforced Concrete Beams
Authors: Liu Te Hung , Chen How Ji , Huang Chung Ho , Lin Shu-Ken
Published: October 2011

A model is proposed to analyze the tension-stiffening behavior of RC beams. The model takes into account the constitutive laws of constituent materials and the bond-slip relationship at the steel-concrete interface so that reliable responses of the RC beams in the post-cracking range can be obtained. It also allows the local behavior of RC beams to be studied in details due to the bond interaction between steel and concrete. Finally, the model capabilities are employed to analyze own experimental results. The midspan deflection and the mean steel strain of RC beams, computed with the proposed model, seem to be in good agreement with those measured in the tests.
Study on Mechanics Behaviors of Composite and Isotropic Shells
Authors: Wu Yao Peng
Published: October 2011

Thin shell structure can show interesting bi-stable behavior. As a novel deployable structure, it shows a broad application prospect in the field of aeronautics and civil engineering, etc. The thesis deduces the general constitutive equations of thin shell structure on the basis of classical laminate theory. If the layup of the composite is anti-symmetric, the results show that there exist tension-bend coupling in the deformation of the shell structure; if the layup is symmetric, there exist bend-twist coupling. For isotropic shell, it has no tension-bend and bend-twist coupling, but if made unstressed from isotropic materials it is only stable in the initial configuration, which coincides with the known conclusion.
The Capacity Assessment about Existing Reinforced Concrete Bridge with Cracks
Authors: Zhang Li Qun , Cui Hong Huan , Wang Hai Long
Published: October 2011

Recently, bridge deterioration with time and ever increasing traffic loads raise concerns about safety and durability of aging bridges. Based on the studies about damage assessment on the level of materials and components，the author made a comparative analysis on the damage mechanism and applicable conditions，and put forward the amended formulas for calculating the flexural and shears capacity，This paper combined with results of previous studies, based on the structural damage assessment research, reinforced concrete beam structure correction formula is given in the event of cracks and shear cracks.The assessment formula for shear capacity was established as well，and in which various impact factors of shear strength was considered comprehensively.
The Ultimate Shear Bearing Capacity of RC Beam Strengthened with SWR External Prestressing under Dead Load Level when Strengthening
Authors: Yu Tian Lai , Han Hong Kun , Li Xin Yu , Ma Qiang
Published: October 2011

The shear resistant with SWR (steel wire rope) external prestressing is a kind of new type of reinforcement technique. The advantages of the method are ideal reinforcement effect, durability, and convenient construction. So the method has been paid attention by more and more scientists and technical workers. Through the experiment of 1 basic beam and 3 strengthened beams which are in different dead load levels, the influence of damage degree of original beams and the dead load level of strengthened beams are analyzed. The reduction coefficient values of shear capacity under different dead load level are researched. The research is shown that: with the dead load level increasing, the improve degree of shear capacity of strengthened concrete beams is smaller. The mathematical model is established, which is about dead load level and reduction coefficient of shear capacity of strengthened concrete beams. The result is to take 0.75 as the reduction coefficient of shear capacity. The value is reasonable in calculating the shear bearing capacity of strengthened beams under dead load.
Ultimate Bearing Capacity of Composition Columns Reinforced with the Prefabricated SHSCUS Filled with Steel Tubes Subjected to Axial Load
Authors: Chen Guo Can , Xu Zhi Sheng , Yang Zhi Shuo
Published: October 2011

This paper presents an experimental investigation on the short composition columns reinforced with the prefabricated super high strength concrete used stone-chop(abbreviated to SHSCUS) filled with steel tubes with 1RC as reference. The experimental parameters were the concrete type inner steel tubes, and L/D ratio, steel ratio and so on. The performance of the composition columns was investigated using different diameter-to-thickness ratio of steel tubes ranging from 15 to 26.6, and different cubic strength of 126.7, 120.3, 122.4, 134.4, 125.4, 111.4, 108.6MPa of infill concrete. The experimental results showed that concrete cover falling off was prior to specimens failure, and that the design rule, as specified in current code suitable for HSC overestimate the ultimate bearing capacity, were not suitable for the case with SHSCUS. Then the hypothesis was put forward based on experimental phenomena observed, and the formula of its ultimate load capacity was suggested based on superposition method, by which the predicted values have a good coincidence with those from the experiments.
Mechanical Properties of Interface Between Soil-Macadam Aggregate and Concrete Pile
Authors: Li Shao Jun , Meng Fan Zhen , Chen Jing , Min Hong
Published: October 2011

The mechanical properties of interface between soil-macadam aggregate and anti-sliding concrete pile are very important for the reinforcement design and safety evaluation of accumulative landslide in the reservoir area of Three Gorges. Soil-macadam aggregate is a complex geomaterial whose properties are totally different with soil or rock. Based on a practical landslide suffering the influence of reservoir water level change and seasonal rainfall, a series of direct shear tests are conducted to investigate the interface mechanical properties between soil-macadam aggregate and concrete pile. Accordingly, the relationship between shear strength parameters and water contents and macadam ratios is presented. The change characteristics of mechanical properties of interface are discussed. The results indicate that shearing strength, inner friction angle and cohesion decrease with less water content. However, as the increment of macadam ratios, the cohesion will decrease gradually, but the shear strength and inner friction angle of interface decrease firstly and then increase after a critical value, the change trend obeys parabolic relation.
Research and Application of Time-Variation Analysis and Key Control Technology in Complex Steel Structures Construction
Authors: Guo Yan Lin , Tian Guang Yu , Wang Xiao An , Chen Guo Dong , Fan Feng
Published: October 2011

This paper presents Integrated Cooperative Time-variation System (ICTS) and its application for constructional process of complex steel structures. ICTS is based on integrated model comprised of structures, boundary conditions, loads, material properties, construction facilities, where all those are supposed to be time-variation associated with a complex construction process. ICTS can deal with mainly time-variation analysis of construction processes, including pre-set deforming, integrated lifting, temporary support removal, rotation pulling, sliding and tensioning. Besides, several key control technologies of structural force and configuration during structure construction process are introduced, such as obtaining error criteria of cable’s length in tensile structures, controlling influence of constructional environmental temperature, estimating differences between internal and external tubes’ vertical deformation of skyscrapers due to shrinkage and creep of concrete of internal tube, evaluating residual internal force of complex welding structures. ICTS and these key control technologies reinforce traditional construction analysis by keeping continuity of constructional process and simulating interaction of different parts in integrated model precisely, and reach to a design-required structural state accurately after finishing constructional process.
Stability Analyses of Western Slopes in Jointed Rock Masses for GuangYang Highway
Authors: Wang Shu Li , Mu Man Gen , Wang Ran , Cui Wen Bo
Published: October 2011

This paper presents the results of a study on a joint slope deformation affecting the western slope of the GuangYang highway (YangQuan, China). Fieldwork identified the ongoing deformational process and assisted in defining its mechanisms, evolution and controlling factors. Here we discuss how to use limit equilibrium methods to calculate the behavior of slopes and to use the finite element analysis to evaluate the stability, displacements of slopes and soil-slope stabilization interaction. The finite element method with shear strength reduction (SSR) technique is explained in Phase2D. This method is effective for the prediction of the stability of slope. Based on numerical comparisons between the limit equilibrium methods and finite element method, it is suggested that the finite element method with SSR technique is a reliable and maybe unique approach to evaluate the slope stability. The paper also took into account effectiveness of the large rain and seismic load. The results of the numerical analysis are consistent with the observed slope surface evidence.
Structural Health Monitoring of Plate Structures Using Lamb Wave Methods
Authors: Zhao Nai Zhi , Huang Chang Tie , Chen Xin
Published: October 2011

In this paper，waveform is used to excite Lamb waves in the test plates during experimental testing. The optimal excitation frequency will depend on the test configuration. In order to select an excitation frequency, dispersion curves are first created to show what frequency range is best suited for Lamb wave excitation. According to dispersion curves were created for the aluminum test plates and it was concluded that a frequency below 1 MHz will be used in order to only excite the fundamental and modes. Experiments are performed on the aluminum test plates described. Experimental testing is first performed on undamaged plates in order to determine the path-to-path and test-to-test variability in Lamb wave measurements in the absence of damage. The admittance data is analyzed in order to determine if any of the PZT transducers need to be replaced because of poor bonding or mechanical failure. The sensor diagnostic technique is applied to each plate and used to ensure proper consistency between PZT transducers
Numerical Simulation of Creep Deformation for Large Section Tunnel in Soil with Visco-Elastic-Plastic FEM
Authors: Liu Sheng , Liu Tong , Liu Bang Zhe , Dong Zi Chao
Published: October 2011

In order to reasonably analyze the influence of rheological properties on the soil deformation behavior of tunnel in soil, this paper establishes visco-elastic-plastic numerical calculation model for analysis of tunnel in soil deformation based on ANSYS software by relying on physical construction. The results show that creep deformation accounts for 24% of total deformation of the tunnel, so it is necessary to make visco-elasto-plastic analysis on tunnel in soil. If the numerical simulation results are basically the same with the trend of temporal curve of measured data, and the data obtained is relatively close, then the established model is correct.
Constitutive Model Identification of Rock Based on Artificial Intelligence
Authors: Sha Sheng Jun , Hao Xiao , Zhai Shu Hua
Published: October 2011

The Identification of rock constitutive model is a typical nonlinear system problem; introduction of the intelligent methods has greatly stimulated the research. In this paper, genetic algorithm , BP neural network and genetic programming are used in the identification of constitutive model ,the capacity of three intelligent methods in the model identification is compared ,whose results show that genetic algorithm can largely reduce the probability of trapping into localized optimum solution by means of its global searching ability ,however , because its pre-assumption of constitutive model has already lead to some error ,its fitting results are not so good . BP neural network and genetic programming need not pre-assume the structure of constitutive model ,the nonlinear mapping expressions between stress and strain are obtained by self-organization and self-learning .But ,the determination of BP neural network structure is experience-depending and time-consuming . In addition, genetic programming need not define its structure, so long as the functional set and terminal set are chosen, after series of genetic operations, the nonlinear relations between variables are outputted, therefore, the operation of genetic programming is simple which realize the visualization of the constitutive equations.
Test Study on Effective Reinforcement Depth of Dynamic Compaction and Filling Replacement
Authors: Li Wei , Zhang Chun Xiao , Sun Peng Xiang
Published: October 2011

Filling replacement combined with dynamic compaction is a very effective method to preprocess the soft soil to obtain larger bearing capacity. That not only has remarkable effect to improve soil bearing capacity, but also has some advantages, such as quick construction, simple equipment, low cost and so on. And that is appropriate for large area ground treatment engineering. The purpose of ensuring the reinforcement effect and saving the project cost, and providing references for the similar projects can be achieved through the test study on effective reinforcement depth of dynamic compaction and filling replacement.
Experimental Study on Compression and Rebound Characteristics of High Liquid Limit Clay of the Yellow River Alluvial Plain
Authors: Zhao Zheng Rong , Yang Hong Xia
Published: October 2011

Based on indoor compression test material of high liquid limit clay about Ji-He expressway,analyzed the relationship among compression modulus,compression coefficient,cuts modulus and resilience modulus of high liquid limit clay of the Yellow River alluvial plain with its moisture content and dry unit weight,and their changing rules.The results show that in a certain dry unit weight condition,free expansion ratio of high liquid limit clay is decreasing with the increasing of natural moisture content, however, in a certain moisture content condition,the free expansion ratio is increasing with increase of the dry unit weight.Compression modulus decreases along with the rising of moisture content,while increases to gether with the increasing of the dry unit weight.The compression coefficient increases with moisture content,while decreases together with the increasing of the dry unit weight.Cuts modulus reduces when moisture content goes up,certain as moisture content is, it is going to magnify along with the increasing of dry unit weight,when both dry unit weight and moisture content are constant,cuts modulus will increase with the pressure.In certain dry unit weight conditions, the resilience modulus decreases as the moisture content increases,by contrast in certain moisture content conditions,the resilience modulus increases with the increasing of the dry unit weight.
Study on the Simulated Testing on Repairing Drainage Pipe of Connecting Passage of Metro Tunnel with the Method of Liquid Nitrogen Freezing
Authors: Zhang Yong , Yue Feng Tian , Shi Rong Jian , Lu Lu
Published: October 2011

The paper derives the similarity criterion aiming at the characteristics of repairing the drainage pipe with the method of the liquid nitrogen freezing in the connecting passage of metro tunnel, and establishes the simulated test system of the liquid nitrogen freezing based on the similarity theory. Through the simulated testing on repairing the drainage pipe with the method of liquid nitrogen freezing in the connecting passage of metro tunnel, we get the regulation of the temperature distribution of the freezing pipe wall, the regulation of the development of the freezing temperature field and the the frost heave displacement.The study instructs the repairing drainage pipe with the method of liquid nitrogen freezing in the connecting passage of metro tunnel, and promotes the development of the thoery of the liquid nitrogen freezing, also provides the reference and improvement for the engineering and study in the future.
Numerical Analysis on Vertical Structural Stability of Floating Drilled Shaft during Sinking
Authors: Liu Ji Min , Wang Chang Bo
Published: October 2011

The vertical structural stability of floating drilled shaft during sinking is an important practical issue on the safety of boring technique in the deep and thick alluvium. In fact, the vertical structural stability of shaft lining is a matter of overturn buckling. Theoretical analysis shows that the height of balance water (HBW) is the most important factor for the vertical structural stability of shaft lining. If the HBW is controlled in a reasonable range, the shaft lining will not buckle during construction. The shaft lining is regarded as a slender bar with closed bottom and floating in the mud while sinking. According to the mechanical analysis on the shaft lining from floating and sinking to the process of contacting the well bottom, a reasonable range of the HBW is deduced. Finally, with practical instances, the author in this article introduces the calculation principle in vertical structural stability of shaft lining while sinking and floating using finite element method (FEM). The simulation results show that in the reasonable range of HBW, the stability of shaft lining increases as the height of balance water goes up.
Study on Formative Mechanism and Preventive Measures of Rammed Earth Wall Cracks
Authors: Zhang Yin , Gao Xin , Zhao De Jun
Published: October 2011

Rammed earth is a construction form featuring energy saving and economical. However, affected by many factors, the existing rammed earth buildings, in the course of usage, would emerge various forms of cracks. Based on the research findings on rammed earth buildings in northwest, north, central and southwest regions of China, crack forms of rammed earth walls and the formative mechanism were analyzed, in turn corresponding preventive measures were proposed in this article.
Reliable Analysis and Study of Lining Structure of Tunnel in Loess Areas
Authors: Niu Ze Lin , Song Zhan Ping
Published: October 2011

Safety and reliability of lining structure of tunnel affect the using of the tunnel. Inspection method Pearson is used, based on reliability mathematical knowledge, the article analyses the reliability of lining structure of tunnel and putts forward the regularity of distribution for the thickness of tunnel lining. At the same time, from the Angle of reducing the tunnel construction cost, the paper putts forward the method of saving the construction cost through mathematical statistics knowledge.
Precise Calculation and Visual Model for Complex Engineering Earthwork
Authors: Wen Lian Yong , Zhang Yong , Nie De Xin
Published: October 2011

Earthwork excavation, as the primary work of the project, the calculation method in quantity not only affects the project budget, but also has a significant impact in the overall project design and construction schedule. This paper applies Kriging algorithm, in combination with 3D modeling, to build accurate 3D solid model through close space, and uses graphic element Boolean operations to create accurate calculation method in quantity of Earthwork in complex engineering, which can display the data of quantity of Earthwork respectively as well as the space, achieve visual design of Earthwork to make up for the deficiency of traditional method, provide accurate calculation for organizing excavation engineering and visual decision-making information.
Optimization on Excavation Design with VE Method
Authors: Chen Hai Ying , Tong Hua Wei
Published: October 2011

This paper obtains function index system of excavation by FAST method and introduces fuzzy comprehensive evaluation to estimate function index system. By analyzing function system of the excavation obtains the evaluation method for excavation design cost, proposing new evaluation standard for excavation design. At last establishing value engineering (VE) optimization model for excavation design, and put it into engineering practice to prove that the model is convenient and practical.
DDM Analysis of the Effect of Non-Linear Structural Plane on In Situ Stress Field
Authors: Li Ke , Wang Ying Yi , Huang Xing Chun
Published: October 2011

Based on the Barton-Bandis non-linear deformation structural plane model, displacement discontinuity method (DDM) is used to iteratively calculate the distribution of in-situ stress field around the structural plane, and then the parameter sensitivity analysis of the structural plane and rock is carried out. The results show that near the structural plane, especially near the tips, stress concentration is quite significant, the closer to the tips, the greater the principal stress difference is; the stress concentration around the structural plane decreases as the stiffness of structural plane grows; with the growth of the ratio of structural plane thickness to length, the stress concentration around the structural plane increases, but when reaching a certain level, the increasing slows down; as the friction angle of the structural plane grows, the stress concentration decreases.
Reliability Analysis of Plate on Elastic Foundation
Authors: Kong Xu Guang , Liu Jun Qing
Published: October 2011

This paper analyzed the board of reliability on the elastic half space model. Considered the random of the larger variability parameters, such as foundation, board, load, the paper studied the reliability of this issue application of first order second moment method. This paper analyzed the influence of the random parameter variability on the reliability index β and failure probability, obtained some useful conclusions and had some engineering referencing.
The Experimental Investigations of the Deep Artificially Permafrost Constitutive Character
Authors: Lin Bin , Ma Tao , Cheng Zhi Bo
Published: October 2011

the results of deep artificial permafrost 's tri-axial compression test showed that the stress-strain relationship of deep original frozen clay presents a character that is weak and soft From the view point of engineering application , the paper gives a exponential model containing two parameter, Comparative analysis showed that the model not only gives a good description of frozen clay stress-strain relationship before peak stress, but also has the advantages of less model parameters, easy to determine and clear physical meaning. The analysis results showed that the model parameters a linear increase with the decrease of the temperature, and the change rule of parameters is contrary.
Study on Vertical Bearing Capacity and Time Effect of the Jacked-in PHC Pipe Pile in the Cohesive Soil Area
Authors: Zuo Hong Liang , Wang Lei , Gao Hong Ying , Guo Liang
Published: October 2011

The static load test of 34 jacked-in PHC pipe piles of medium length are performed in the cohesive soil area, the relationship between the vertical ultimate bearing capacity and the final pressure, and the time effect of vertical bearing capacity of the jacked-in PHC pipe pile are studied. The data of static load test is analyzed statistically with software SPSS, the regional empirical coefficient about the vertical ultimate bearing capacity and final pressure, and the time effect formula about vertical bearing capacity of the jacked-in PHC pipe pile in the cohesive area are obtained. According to the regional empirical coefficient, the pile pressing machine and counterweight can be chosen reasonably and the vertical ultimate bearing capacity of single pile can also be estimated rapidly, then we can instruct the design and construction of the jacked-in PHC pipe pile. According to the time effect formula, the vertical bearing capacity at different periods of the jacked-in PHC pipe pile can be obtained, the cost of the foundation engineering can be reduced by considering the time effect influence to the vertical bearing capacity of the jacked-in PHC pipe pile.
Research of Elastic Camber for Prefabricated PC Girder
Authors: Sun Quan Sheng , Wu Tong
Published: October 2011

In the process of prefabricating some genenal box girder,T girder,I girder,cored slab,a tension of prestress will give rise to the camber which is the important evaluation criterion of bridge engineering quality[1].This paper take XiHuXiuZi bridge and FuXingPao bridge as background to research elastic camber of prefabricated PC girder.Then the model of prefabricated PC girder is established through finite element analysis software Ansys.The model data is compared with the collected data after finishing the model.The factor which can impact elastic camber is researched deeply.Lastly,the relations between the elastic camber of prefabricated PC girder and each influential factors is determined through changing model parameters.
Research on Application of Seismic Piezocone Penetration Tests in Pile Foundation
Authors: Cao Quan , Chen Hong , Chen Fa Bo
Published: October 2011

According to the characteristics of installation about the penetrometer of seismic piezocone penetration tests (SCPTu) and the pile, a theoretical relationship between ultimate bearing capacity of single pile, time-effect of shaft bearing capacity of single pile, excess pore water pressure around the pile during pile driven and the data measured from SCPTu is developed based on the cavity expanded theory, the Terzaghi one-dimensional consolidation theory and effective stress theory. The result of field test in KunShan and the calculated result which used the theoretical relationship mentioned above are compared. The results indicate that the analytical solutions agree well with the in-situ tests, which show that the application of seismic piezocone penetration tests have wide range in the pile foundation.
Analytical Evaluation of Lateral Displacement of Cemented Soil Retaining Wall for Excavation
Authors: Xu Hai Yong , Chen Long Zhu
Published: October 2011

A fitting function of lateral displacement of cemented soil retaining wall was proposed according to several measured data of excavations. On this basis, the retaining wall was treated as a homogeneous elastic vertical beam, whose toe and heel were restricted by a spring constraint but still could be moved and rotated. An analytical formula of the lateral displacement of the retaining wall was deduced with the principle of minimum potential energy with consideration of all the external forces. Compared with some other measured data, the average relative error of the formula was less than 10%, which preliminary indicated the formula’s practical value.