Applied Mechanics and Materials Vols. 193-194

Abstract: In order to completely consider affects of various subjective and objective factors for decision of soft ground improvement, according to quantitative index and qualitative index influencing soft ground improvement, a fuzzy integral decision model about definitive set was presented, based on improved Sugeno fuzzy integral on the basis of fuzzy measure. A computer program for applying the model to solve multi-objective decision making problem was given. The feasibility of its model was verified through the optimal choice for decision of soft ground improvement in practical engineering. The given example shows this model can be successfully used to make decision about soft ground improvement method of the expressway. At the same time, the decisional model above is useful and effective for evaluating the other complicated systems.

Abstract: The formulas of critical edge pressure and critical load are usually developed by assuming Poisson’s ratio equal to 0.5. It means that the soil be in a triaxial equi-compression state. This assumption increases the lateral load of subsoil, and makes the subsoil be in intensive state, and results in a higher bearing capacity of subsoil. In the paper, a MATLAB program is used to find the numerical solution of bearing capacity of soil with different Poisson’s ratio. This method corrects some calculating mistakes when proposes calculation formulas of subsoil bearing capacity which obtains Poisson’s ratio unequal to 0.5. And it compensates the limitation of some other calculation formulas. The influence of shear strength parameters of subsoil on critical load is analyzed.

Abstract: In this paper, the three-dimensional finite element method has been adopted to respectively establish the base isolation of the two-tower structure with enlarged base and the story-isolated vibration analysis model. Each model has been conducted the elastic-plastic time-history analysis under the horizontal earthquakes. The results show that the dynamic characteristics of the structure have been significantly changed through the arrangement of isolation layer; the seismic responses, such as the story drift, the seismic shear and the acceleration of the structure, have been also greatly affected and the damping effect of the structure is obvious.

Abstract: Adopted the load-structure model to tunnel structure design calculation, our country often use surrounding rock pressure experience calculation formula, This paper analysed the problems existing in the experience calculation formula and calculated the surrounding rock pressure have influence on calculation results of tunnel structure internal force with the formulas, and at last given out more actual modification formula, the surrounding rock stress is continuity with the formula calculated, it is more actual than the traditional experience formula, provided a new way for accurate calculated the surrounding rock pressure.

Abstract: Abstract：Polyurethane concrete which applies to the rapid repair highway pavement was systematically researched. Influences on mechanical properties of the polyurethane concrete of cement-dinas and binder-aggregate ratio, curing agent dosage, thinning agent dosage, etc. were analyzed in this paper. Furthermore, the optimal formulation materials were gotten to use in the repairment of used-broken cement blocks in the experiment. Simultaneously, the microstructure of polyurethane concrete and their adhesive situation bewteen waste cement blocks were observed through scanning electron microscope (SEM). The results show that the flexural strength of the specimen for two hours can reach to 6.67 MPa, and the compressive strength can reach to 9.15MPa, which can achieve the rapid pavement repair on highway in two hours, and it is superior to the related Chinese Standard. Besides the SEM images indicate that polyurethane molecular and aggregate are firmly bonded to each other as well as the cementation between polyurethane concrete and concretes, it means that the material has characteristic of rapid repair as well as good mechanical property.

Abstract: In order to accurately get the concrete pier temperature field, this paper briefly introduces the types, advantages and disadvantages, development of temperature sensors and the composition, function and measurement accuracy of LTM-8663 intelligent temperature monitoring system. The system has high measurement precision, so we can measure the temperature field by it. In order to certify the rationality of test methods, taking a concrete pier section model as an example, we use the system to measure its sunshine temperature fields in different ways of embedding sensor. According to the comparative analysis of sunshine temperature fields measured in pier section model, we get useful conclusions and recommendations to be provided references for the concrete temperature measurement in piers and other structures.

Abstract: This paper presents a case study detailing the characteristics and mechanism of Shuiboxia landslide revival induced by the earthquake located in Bailongjiang River, 700 m upstream of the Shuiboxia Dam, in North West of China. After the“5.12”Wenchuan earthquake, landslide revived entirely and downstream zone cracked quite evidently. Based on the regional geology background, detailedly researched the deformation and mechanism of landslide. The research manifested that landslide revival is attributed to cumulative effect of seismic shaking resulting in reducing of strength parameters of the sliding zone, deformation were affected by the landform and evident amplification effect of landslide under the earthquake. Numerical simulation adequately explained the mechanism of landslide revival.

Abstract: This article mainly study on AHP application in cave dwelling construction system, based on the combination with professional experience and the investigation of the folk, put forward the influence factors of building in caves, By establishing the hierarchical structure model ladder to explain the interaction of the various factors relationship，And then calculate and recognize the key factors in influencing of the cave-building, in the hope of improving the construction quality of a cave reference function.

Abstract: Two evaluation models AHP / Fuzzy AHP were discussed and used for integrated assessment of highway landscape evaluation scheme, by initial AHP calculation of the weight of highway landscape evaluation factors, followed by the judgment matrix fuzzy calculation and evaluation. The results indicated that the more objective and scientific evaluation can provide a new method to evaluate highway landscape.

Abstract: The application of ABAQUS finite element software non-linear finite element analysis of brick masonry walls with structural column. Build three brick masonry wall models, and analysis of the damage form of the wall under different vertical compressive stress and horizontal force. Thus the analysis result compared with the calculation result of the relevant specification formula, in order to get validate compression influence of masonry aseismic walls. It turned out that different vertical compressive stress effect the shear capacity, and failure mode of brick masonry wall structure with a structural column.