Advanced Materials Research Vols. 374-377

Abstract: In the process of engineering prospective design and constructing, it is necessary to avoid the adverse impact of geological phenomena, such as fault, karst and landslide. Therefore, it’s important to choose a favorable project address by scientific and effective detection with engineering geological conditions. The main exploration method for geological conditions is the geophysical exploration, including: high density electrical method, ground penetrating Radar, seismic exploration method and so on. The discrimination result with a single geological method changes much, and it is difficult to make an accurate analysis of the geological conditions. So we should composite a variety of exploration methods. In this paper, it expounds the fundamental, the working method, data explanations of the high density electrical method and ground penetrating Radar firstly. And then it takes exploration of candidate sites of an aluminum waste disposal plant for example, the geological conditions of candidate sites are analyzed under the two geophysical methods. The study results of engineering site option have a positive role in guiding the work.

Abstract: In order to study the particle breakage of granular materials during compression, a series of triaxial compression tests were conducted for gypsum granular materials. Meanwhile, the primary study on evolution laws of particle breakage was carried out. It was found that the deviator stress increases with the increase in confining pressures for gypsum granular materials at the same axial strain. The degree of particle breakage of gypsum granular materials increases with the increase in confining pressures. The relative breakage index can be adopted to denote the particle breakage degree and increases with the increase in confining pressures. When the initial grain size distribution of gypsum granular materials is fractal, the grain size distribution complies with fractal during compression under different confining pressures. The fractal dimension increases with the increase in confining pressures and can be adopted as a parameter for measuring the degree of particle breakage.

Abstract: In this paper, axial compressive loading test and non-linear finite element analysis of 10 short composite-sectioned concrete filled steel tubular column specimens are introduced. The test results indicate that the failure modes of all the specimens are similar, the specimens have high axial compressive strength and large deformation capacity. The calculated axial compressive strength of the specimens, assuming that the circle steel tube provides the lateral confinement to the core concrete and the square steel tube provides compressive strength without contributing lateral confinement to the concrete, has good agreement with the measured strength. The vertical load-strain curves, the axial compressive strength and the failure mode obtained by the non-linear finite element analysis of specimens have good agreement with the test results.

Abstract: The rupture disasters occurred in more than 110 shafts in Eastern China in recent 23 years, and that caused a significant economic loss. The stress evolution in shaft is investigated by R/S method based on in-situ measured additional strain caused by ground drainage in present study. The results indicated that the R/S method predicts the variation of additional strain well. The Hurst index for additional strain lies in the range of 0.5~1 and the sequence is random walk with positive skew. In other hand, the positive skew of stress in shaft is less evident at the depth of 120 m. The research proposes guidance for prevention similar shaft rupture disaster is provided for similar shaft.

Abstract: Due to the fact that real estate prices is not only concerned with common people live and work in peace and contentment, but closely associated with the trend of national macroeconomic situation, the excessive rise in real estate prices has drew extensive attention in all layers of society. Many experts and scholars pointed out that high real estate prices in some cities and regions have already became the latent danger to the healthy and sustainable operation of macro-economy. Our country has begun to initiate control measures over the real estate industry forbidding the developers’ land reserves, accelerating the construction of policy-based house, and a series of measures to curb the excessive rise in price; however the effect of policy implementing is far from satisfaction. Under the background that the whole society all focus on the higher and higher prices, talking about the reasons driving the real estate prices to rise were particularly necessary. Land finance is not the authentic reason promoting prices and its effect maintains uncertain. The predecessor’s work still lacks of empirical research; what’s more, the effect of land finance on the real estate prices should be considerate from the point of its expenditure channel: the degree of its promoting real estate prices is to a great extent associated with expenditure channel in our country. Even if the benefit of land transfer is high, due to the balance of payment deficit is small or more expenditure on policy-based housing and the old city renovation. Land finance will finally weaken its promoting effect.

Abstract: A new method of transmission lines of static state has been proposed in this paper—A progressive approximation iteration state method; the galloping conductor of the parameter of construction and environment has been simulation analysis. The relation between galloping conductor and the parameter of construct- ion and environment has been acquired

Abstract: No relevant high earth face rockfill dams built across a river valley with a width-to-depth ratio of more than 8.0 is reported both at home and abroad. In this paper, non-linear finite elements method is adopted to analyze the seismic response of a 139m high CFRD proposed across a river valley with a width-to-depth ratio of 9.5, and dynamic response conditions such as dam’s absolute acceleration, dynamic displacement and dynamic stress etc., are highlighted Analysis results show that under existing design conditions, due to great river valley’s width-to-depth ratio, dam’s seismic response under an earthquake action of 8 Richter Scale is not intense, but an evident whipping effect occurs at the crest, it is necessary to take corresponding anti-seismic engineering measures.

Abstract: Existing research results have indicated that dam material’s rheology under a high stress state is quite evident. In order to study the influence of dam material’s rheology on the stress and deformation of a CFRD, a nine parameter power series rheology model is adopted to analyze the stress and deformation of a high CFRD considering the dam material’s rheology. Calculation results show that since an obvious increase in dam body’s deformation occurs after considering the rheology characteristics of rock-fills, dam body’s stress tends to relax. Rockfill’s rheology characteristics increases the deflection of a face slab to a certain degree, face slab’s slope and dam’s axial maximum tensile stresses rise somewhat as well. As for a high CFRD that face slabs are placed in stages and water impounds in stages, a proper rheology constitutive model is adopted to correctly simulate rock-fill’s rheology characteristics, and results from this modeling can be used for reference for the determination of dam’s filling schedule and face slab’s staged placing and have important meaning for correctly predicting dam’s stress and deformation.

Abstract: Guangzhou West Tower (GZWT) is the second tallest building in China with 432m height. Based on the 3-D finite element model of this building, a reduced finite element model was first established for the wind-induced vibration analysis in the paper. Several models for the amplitude-dependent structural damping and aerodynamic damping ratio were adopted to evaluate the nonlinear damping effects on the wind-induced response of this building by using the surface wind pressure record in wind tunnel test. Wind-induced responses evaluated by amplitude-dependent damping were compared with those obtained from constant damping ratio assumption through the comprehensive studies for several wind load cases.

Abstract: The uncontrollable factors such as construction errors, material inhomogeneity, etc. will inevitably lead to a certain initial imperfections. It is generally known that the stochastic initial imperfection of the structure is an important factor for affecting structural stability and bearing capacity. Since these imperfections are random in nature, this paper proposes the method mainly based on the standard orthogonal basis to expand the stochastic field, taking into account the decomposition of the stochastic initial imperfections related to structures, which is projected in the buckling mode orthogonal basis. In the end, the article by the stability analysis example shows that this method can use less random variables effectively describing the original stochastic imperfection field, and efficiently search for the most unfavorable initial imperfection distribution form in order to ensure the imperfection sensitivity structures have a higher reliability, so it can be applied to large-scale engineering structure stochastic imperfection analysis.