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At present, three-dimensional parametric CAD technology is used widely in the field of agricultural mechanical design. Based on the analysis of matsune shovel's structural features for the stubble harvester machine, matsune shovel solid model was drawn by using three-dimensional CAD software Pro/E. Matsune shovel's static analysis was done by finite element analysis software ANSYS Workbench, and static...
The dynamic working process of the chamber system of shield machine was modeled by discrete element method. Taking the shield machine tunneling in a railway line as the research object, the geometry structure and size of the model was determined. The particle model parameters were calibrated by the triaxial test curves of the soils from the railway ground. Comparing the numerical simulation results...
The sodium sulfate in the surrounding environment of cemented soil may affect its mechanical property, which may cause some serious damage to structures. In order to study the erosion effect mechanism, a series of tests were conducted on the cemented soil blocks which were cured in the sodium sulfate solutions with various concentrations and ages. The testing results show that the sodium sulfate solution...
Starting at analyzing the characteristics of vulnerable ecological system, this paper selected 3 landscape indexes of FI, FD and FN, and 1 eco-environment index of erosion to make up the eco-environment sensitive factors, and chose the ecological suitability as automatic recovery ability. Thus it built up an Eco-Environment Vulnerability Assessment Model to evaluate the effects of Returning Farmland...
Through constructing to refilling the dry dock for the tunnel cross Haihe River in Tianjin Binhai New Area, the slope of the dock will be undergoing three stages, i.e., excavation, water filling and water draining, respectively. The stability of the dry dock slope is studied by using Fellenius method of slices and Bishop simplified method. At the excavation stage, the soil disturbance is considered;...
Based on a practical engineering project (in yanjiao), which uses composite foundation with CFG & GC piles to improve the bearing capacity of composite foundation and deal with the soil liquefaction. The composite foundation's capacity and function mechanism are analyzed in the paper, and test results of the composite foundation are also discussed. These include the test results of the carrying...
As a new type of pile, expand-footed tubular pile consists of pre-stressed concrete tubular pile and enlarged concrete foot formed by extruding concrete. Its construction technique, load transfer characteristic, laboratory model experiment, in-site test and application in a project are introduced here. It is found that by statically driving some concret into tubular pile bottom, an ellipsoidal foot...
A tied-arch bridge is an arch bridge which incorporates a tie between two opposite ends of the arch. The tie is capable of withstanding the horizontal thrust forces which would normally be exerted on the abutments of an arch bridge. The elimination of horizontal forces at the abutments allows tied-arch bridges to be constructed with less robust foundations, and can be situated in areas of unstable...
Exploiting the potential value of dry crust can produce great technical economic benefitis in important projects, especially in highway engineering, but the characteristic of dry crust's stress dispersion on two-layered subgrade needs further study at present. Based on the experimental road section of Xingtai-Linxi highway in soft soil area, the monitoring data of lamination settlement, which has...
In view of the adverse engineering characteristics of saline soil such as collapsibility, salt expansion and corrosion, cement, cement-lime and KD curing agent have been respectively used to modify the saline soil in the coastal areas for engineering application. Unconfined compressive strength test of the modified soil has been conducted to analyze the reasons why the two previous modified materials...
Massive laboratory test and analysis have shown that the water sensitivity of asphalt constituted by unclean aggregates is larger than that of clean aggregates;For an asphalt mixture with neutral rock mineral aggregate and size distribution of AC-13 and the sediment percentage of coarse and fine aggregate presumed to be the same, the impact of the former on the water stability is lower than the latter...
This paper presents the main structures of the road tubular composite foundation: the embankment fill, tubular pile, cover plate, geogrid and foundation soil and, in the project, analyzes the structural function of the tubular pile, cover plate and geogrid. In the viewpoint of the key problems of the bearing behavior and the settlement: the soil arching effect, the tensioned membrane effect, the soil...
Based on data observed in the blasting vibration test of the K107+157~268 road slope and K107+730~816 road slope of Hurongxie Expressway, an empirical formula for the blast vibration is obtained after the treatment of mathematical regression analysis. The vibration velocity of buildings at the different distance is calculated with this formula. With reference to the permissible safety vibration velocity...
The paper first analyzes the seasonal variation law of subgrade resilient modulus and water content, and then summarizes the common quantitative adjustment methods, calculation of the equivalence of resilient modulus based upon damage equivalence, for resilient modulus of subgrade in the process of season alterations. Finally, the paper puts forward a seasonal readjustment calculation formula for...
Large direct shear friction tests are conducted on reinforcement/soil interface in the paper, producing the shear stress-displacement curves and c & φ, the reinforcement/soil interface strength parameters under different testing conditions with various fill compaction degrees (90% and 93% respectively), different water contents (7.23%, 10% and 12%) and various geogrid bore diameters (5cm, 10cm,...
Based on the measured data of hillslope simulated rainfall experiment in the Loess Plateau of China, the method of back-propagation neural networks optimized by genetic algorithms was used to establish the hillslope runoff and infiltration model. The rainfall intensity, rainfall duration, initial soil water content and slope were selected as the model inputs, the runoff volume and infiltration volume...
On the basis of the theory of the concept of disturbed state of the granular materials proposed by C.S. Desai for sandy soil, through defining the relatively complete state and the completely adjusted state, we established the disturbance function, the constitutive model for the disturbed state of granular materials, and the methods for determining the parameters. The calculation results obtained...
The three-dimensional distributing discipline of additional stress and settlement of homogeneous soil is studied by using finite element method, for the foundation of good-sized oil storage tank. The finite element results are proved reliable and reasonable, compared with those by formula of criterion. Then, according to the geological references of Cangzhou refinery in Hebei province, the distribution...
With world population growth, the demand for food, vegetable and so on is increasing. However, arable land area cannot expand. Moreover it would decrease owing to land use change with socio-economic development. Especially in China that is the most populated country in the world, while its cultivated land area could not match with the population, farmland is gradually declining with urbanization progress...
Based on analysis of Sanlihua talus slope formation mechanism in Yi-ba expressway, the paper adopts the limit equilibrium method and numerical analysis method to evaluate its stability. The result shows that, it can not achieve the design criterionand must be reinforced. According to its stability conditions and characteristics, anti-slide pile and surface drainage are used to treat the talus slope...
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