Applied Mechanics and Materials Vols. 71-78

Abstract: In the presented work, the comprehensive evaluation index system of the repair and reinforcement technology carried on mortar perfusion machine is constituted by 24 indices. According to expert investigation data, entropy method and maximum membership degree are employed to determine the weight of each index and do comprehensive evaluation respectively. It could be found that the largest social benefit of this technology was achieved under the condition of an excellent overall efficiency. Finally, some policy recommendations are proposed based on the evaluation results of relevant technology.

Abstract: The accidents such as explosion, leakage, poisoning and fire happened constantly in dangerous goods' transportation. The consequences of the accidents are serious. This article has statistically analyzed 485 transportation accidents of dangerous goods. It shows that the main reason causing dangerous goods accidents is road traffic accidents. The key to ensure the seasonable rescue is effective visual monitor using GPS, modern communication technology, GIS to dangerous goods transport vehicles. So we construct the transportation monitoring system. When the accident inevitably occurs, we propose the rescue mission and response program. Only effective monitoring and timely rescue, can we reduce the rate of accidents and ensure our safety.

Abstract: In order to research the harm of particle matter to human health, the TSI dust instrument, particle counter and miniature meteorological instrument were used in this paper to monitor the PM₁₀ concentration of one typical cross road in Xi’an city. The affect factors of the PM₁₀ concentration were also discussed. The results provided that: there is weak linear relationship between sample concentration of PM10 and wind velocity because of the complex shape of the buildings. The fine particles (<1.0μm) mainly come from vehicle emission in the cross road,and the sample concentration of PM₁₀ has a significant relationship with the fine particles under high humidity conditions, while it has weak correlation with traffic flow. The fine particles from vehicle emission and the high humidity condition is the primary cause of the high PM₁₀ concentration, while the temperature and airflow caused by the building shape affect the diffusion and distribution of the PM₁₀.

Abstract: Generally, there are two types of critical failure surface of slope, which are circular surface and non-circular surface. To circular slip surface, the search of slip surface can be transformed to search of coordinates of the circle center and radius. While to non-circular slip surface, the search of slip surface can be transformed to search of coordinates of some reference points on slip surface. So, the search on slip surface of slope is a very typical optimization problem. To solve this problem, one new optimization algorithm-continuous ant colony algorithm is introduced. At last, through a typical numerical example, this new method is verified.

Abstract: Rheological experiments were carried out for sandstone and marble specimens from left bank high slope of Jingping First Stage Hydropower Project by using the rock servo-controlling rheology testing machine. Typical triaxial rheological curves under step loading and temperature curves in the process of rheological experiment were gained. BP neural network is improved by Levenberg-Marquardt algorithm. Improved neural network model for rock rheology is established in accordance with the rheology experimental results of rock specimen. The improved neural network model was used to forecast rock rheological experimental curves, and the result shows that the forecasted rock rheology curves are closely accorded with the experimental result. The improved neural network model takes into account the influence of loading history and temperature difference on the rock rheological deformation, and the forecasted result can reflect better the rheology deformation behavior of rock material.

Abstract: As an important part of expressway, interchange has space multi-layer structure form and function of stereoscopic transportation steering, which transforms traffic flow, combs and controls traffic. At present the overpass occupies excessive land and large-scale project, which is serious waste of land resources. Under the premise of ensuring road capacity and traffic safety, in order to save land resource, based on Traffic Engineering, Psychology and other theory, the paper used the method of combination of computer simulation and field experiment, that’s through simulation of a driving simulator cabin got the tensity threshold of driver’s psychological and physiological reaction. Field tests were carried on about cars and drivers on the 68 expressway interchanges in Liaoning and Hubei province by using MC5600, dynamic driver heart physiological tester and other equipments. In addition, the paper surveyed the speed of the vehicle on the road and drivers’ psychological and physiological reaction, constructed mathematical model of driver tensity through analyzing feature point velocity and law of drivers’ psychological and physiological reaction, put forward suggested value of land-saving ramp circular curve radius ensuring traffic safety and service level from the point of speed consistency and driver tensity, which would make expressway interchange design meet the concept of economical highway. Therefore, the paper ensures the quality of highway geometric design as well as improves the effectiveness of highway construction and operation.

Abstract: To ensure the construction quality of EPS external wall thermal insulation system , need to controll raw materials, construction conditions, construction methods and quality control acceptance criteria and other aspects

Abstract: Selecting the correct equipment is a multifaceted cost and benefit evaluation process due to the complexity of today’s construction projects and lack of considerations of all factors. Based on the analysis of traditional influence factors on the selection of construction equipments, carbon emission constraints were introduced to facilitate green construction. These factors were divided into three categories, which are certain factors, soft factors and carbon emission constraints, based on their own characteristics. By the classification of the factors, their impact on the selection of the construction equipments was studied in detail, especially the carbon emission constraints was investigated from three aspects: relationship between the emissions of CO₂ and fuel consumption, standard and regulations of CO₂ and carbon tax. The purpose of this paper is to find the main influence factors and provide a basic theoretical reference to the selection of construction equipments for decision-makers.

Abstract: This study is to forecast the impact force and impact position of free over-fall flow in the downstream by using artificial neuron networks (ANN). A simulation procedure for the ANN algorithm was established to train and validate numerical samples with the experimental data. The outcomes of simulation show the ANN method can properly estimate the impact force and position.

Abstract: This study composed the well-known criteria to design the grain size distribution of backfilling filter for groundwater monitoring well (GMW) under the sand and gravel layer. With an assumption of linear logarithmic scale distribution from D₁₀ to D₉₀, the coefficient of uniformity C_u can be formulated for D₁₀, D₆₀, and D₉₀ corresponding to D₁₅. Then, D₀ and D₁₀₀ can be obtained by linearity relationship. The method of backfilling filter deployment was then demonstrated by a practical application, which validates the procedures of existing filter design.