Advanced Materials Research Vol. 1089

Abstract: Constant flow pumping test is finished in the 7th shaft tunnel of Humaling,based on the measured data,permeability coefficient of tertiary system sandstone is calculated by using Boulton formula wiring method,lining method and water level recovery method.The value is 0.14～0.23 m/d,Providing a reliable basis for further engineering application.Compared this data with that permeability coefficient calculated by J.Dupuit method when pumping stability.The conclusion is that there have a critical value,the latter numerical value greater than the former when the distance of observation well and pumping well less than critical value,and gradually become smaller than the former with the distance of observation well and pumping well increase and greater than critical value.

Abstract: Partial coefficient finite element method is a new method of analyzing the stability of jointed rock slope. Partial coefficient Finite element analysis of joints rock slope stability, the calculation accuracy will be influenced by many factors, Such as the yield criterion, the mechanical parameters of rock mass, the computing grid, etc. In this paper, combined with example analyzed the impact of these factors on the partial coefficient method calculation accuracy. Considering material partial coefficients of slope’s weak layer, then, the weak layer is reduced by the strength reduction method. Analysis results show that: Using partial coefficient method analysis of stability of rock slope, under the associated flow rule, should choose Mohr-Coulomb inscribed circle criterion. In addition, when using Mohr - Coulomb inscribed circle criterion, the modulus of elasticity and poison’s ratio on the calculation results can be ignored. And with a few elements ideal result can be deduced.

Abstract: The prevention of urban floods and heat islands has become key emerging topics following recent climate changes. Pervious concrete can be used to effectively promote rainwater run-off into the ground, conserve base water, control floods, and regulate temperature. In addition, integrating and applying recycled aggregates, such as slag, in pervious concrete is an emerging development trend for enhancing the protection of environmental sustainability. In this study, we investigated various quality characteristics of pervious concrete. We adopted the design of experiment method as the research method, in which orthogonal arrays, factor response analysis, and analysis of variance were used to analyze data, and water-cement ratio, aggregate size, aggregate type, and cement paste filler ratio were the control factors. The analysis results obtained in this study can serve as a reference for pervious concrete proportioning designs.

Abstract: To figure out the physical and mechanical performance of graphite foam concrete，orthogonal test was applied to ascertain four factors for graphite foamed cement-based material (GFCBM). The influence of water cement ratio, graphite content, hydrogen peroxide content and sodium sulfite content on the dry density, porosity and compressive strength was also discussed. The results show that sodium sulfite has a relatively significant effect on the physical and mechanical performance. The dry density and compressive strength increases first and then decrease with the water cement ratio, adding of hydrogen peroxide and sodium sulfite increasing and increase with adding of the graphite. The trend of porosity is opposite to the dry density and compressive strength. The optimal scheme for this experiment is water cement ratio 0.68, 5% graphite, 8% hydrogen peroxide and 6% sodium sulfate.

Abstract: Combined with engineering requirements of the Qingyu reservoir, the ANSYS finite element software was used to establish an elastoplastic gravity dam calculation model which considered the mechanical properties of weak structural plane of rock in the dam foundation. An analysis based on not only the finite element iteration not converging,the plastic zones in dam foundation rock developing to through the foundation and the mutation in horizontal displacement of feature points, but also the discontinuous variation of the distribution of horizontal displacement of dam foundation rock, the dislocation between the above and below of weak layers and the leap of iterations were took as the criterions to get the deep anti-sliding stability safety factor of gravity dam by gradually increasing the load burdened on the upstream face of the dam. This thesis illustrated the principle of the elastoplastic finite element analysis for the deep stability of gravity dam by the method of overloading, demonstrated the feasibility of this method ,expanded the criterions to determine the safety factor and obtains the safety factor of this practical engineering under the elastoplastic overloading method.

Abstract: The gradation curve of SMA asphalt mixture directly affect the performance of road. Before the optimization gradation of asphalt mixture material, the primary material of asphalt mixture gradation curve must be determined in the plan. Through the orthogonal experiment method, the full collision combination of three levels and three key factors of asphalt mixture effect, that will be taken into account. Through the 9 groups of grading curve experiment, the expected results of 27 groups in the general experiment will be achieved. Comparative analysis of advantages and disadvantages with the properties of the mixture road 9 group grading curve corresponding, can get the recommended gradation curve range. Comparing with the normal grading curve primary method, through the orthogonal experiment method in primary SMA asphalt mixture curve can reduce the testing time, reduce material’s artificial waste and environmental pollution.

Abstract: In this paper, on the basis of specimen model size mentioned in steel reinforced concrete coupling beam stress performance research, using the ANSYS finite element software about coupling beam specimens with different steel plates for one-off monotonic loading. Through the comparative analysis of simulation results, to explore the impact of different steel plate forms on concrete mechanical properties and ductility of coupling beams .

Abstract: For the retaining wall in translation, in this paper the writers present the minor principal stresses trajectory which named minor principal stress arches. By discussing the results of the various arch curves in arching effect with different displacements of retaining wall which include the arch curves in ultimate model of soil and the arch curves in none limit state of soil. It gets the soil arch curve change rule under different state of the displacements, different friction angles and different height: the arch curve turn gentle when the displacements increase.

Abstract: Focusing on rigid retaining wall under translation movement mode, the earth pressure under non-limit state considering translational movement effect is studied. Considering the translational displacement effect of internal friction angle of the backfill and the wall soil friction angle,we established the relation formula between internal and external friction angle and displacement and got strength and distribution of horizontal earth pressure, strength and the acting point of resultant force on retaining walls at any displacement in mode of translation. We also compare the calculation of earth pressure obtained by the calculation method proposed in this paper with the measured values of the model and found and they are on the whole the same.

Abstract: To analyze the mechanical properties of steel tube filled with steel-reinforced concrete(STSRC), the mechanical models and some related problems of STSRC under different loading ways are proposed for the analysis on the base of finite element software: the concrete plastic damage constitutive model, the contact between steel and the treatment of boundary condition, etc. There are three types of specimen for analysis: short column, long column and pure bending beam. The results indicate that the mechanical models and the relevant technical analysis of STSRC are reasonable, and are beneficial to convergence. The discussed methods can provide a reference for the scholars to study on other composite steel-concrete structures.