Applied Mechanics and Materials Vols. 446-447

Abstract: This paper ananlyzes and contrasts the direct shear test of the expansive soil with different weathered sand dosage (mass ratio) and different lime dosage (mass ratio) in the case of the expansive soil with some water content and dry density .And try to analyzes and researches the impact of expansive soil improved by weathered sand and lime shear strength index . The direct shear test by the expansive soil mixed with different proportions of weathered sand and lime can be concluded that: mixing the weathered sand to improve the shear strength of expansive soil is effective, and cohesion gradually decreases with the increase of doped proportion of sand and the angle of internal friction first increases with the increase of doped proportion of sand and then decreases ;mixing of lime is effective to improve the shear strength of expansive soil, and cohesion gradually decreases with the increase of doped proportion of lime and angle of internal friction first increases and then decreases with the increase of doped proportion of lime. The shear strength of improved expansive soil can meet the subgrade filling with soil standards and at the same time the expansive soil improved by weathered sand and lime reduces the amount of lime and reduce project cost when to achieve the same shear strength standards.

Abstract: The instability of seepage and stress field coupling in unsaturated soil caused by wet process, resulted stability change in unsaturated soil.Thus,it is important to analysis the conditions of the coupling stability not in theory but in engineering. A coupled seepage and stress field model was derived from the transport laws in continuum mechanics and Darcy's law, integrated with fluid motion in porous media. Then, a linear instability analysis was performed to investigate the general conditions of which kind would trigger the non-stability of the coupling field. Finally, some variables, which have a significant effect on the onset of the instability of the unsaturated system subjected to the instability of the coupled model, were proposed in some simplified conditions.

Abstract: This paper combines with a practical framework and structure design of aseismic reinforcement, conducting with the original structure two levels of seismic identification. Through the analysis of the results of identification, choosing reinforcement of steel structure scheme on the original structure. According to analysis of the results of original structure reinforcement by software calculating, understanding the seismic strengthening effect on the overall performance of the original structure. So as to provide reference for similar projects.

Abstract: Recently, building and other civil engineering structures are built with energy dissipating device in order to reduce the damages caused by earthquake. There are a number of seismic energy dissipating device and steel dampers are among many energy dissipation device which is widely used because they are easy for construction, maintenance and low cost. Shear panel damper (SPD) is a type steel damper that dissipates energy by metallic deformation or using hysteresis of material as a source of energy dissipation. Low yield point steel is a good material to be used as a hysteresis damper since it has excellent ductility performance. Nonlinear finite element analysis was carried out to predict the large deformation and hysteretic behavior of SPD using low yield point steel (SLY120) for different width-to-thickness ratio. In order to verify the analysis simulation, quasi-static loading was also conducted and from the comparison a satisfactory result was found.

Abstract: In condition of extraction roadway with existing bolt support at Zhao Lou coal mine as the object, the substantial function and evolution mechanism of anchor rod and anchorage structure are studied by using a variety of means; perfected suggestions about roof separation indicator are put forward; the separation phenomenon and the bolt support structure interaction state and the correlation of roadway stability are researched; method of determination of the critical value of roof separation are put forward and the criterion of the bolting structure failure and surrounding rock losing stability of roadway with the bed-separation volume as the main indicator are provides the basis for.

Abstract: Horizontal bearing capacity and seismic resistance of Recycled aggregate Concrete Filled Steel Tube (RCFST) columns under low cyclic loads have been analyzed by nonlinear finite element software in this paper. A three-dimensional nonlinear finite element (FE) model was developed, and some parameters that affect the restoring force model of RCFST columns were studied, including axial compression ratio, steel ratio, steel yield strength, strength of core recycled aggregate concrete and recycled aggregate substitution rate. Analysis results show that, along with steel ratio, steel yield strength and recycled aggregate substitution rate increasing, seismic resistance of RCFST becomes better. However, the increase of core recycled aggregate concrete and axial compression ratio will weaken seismic resistance of RCFST columns.

Abstract: Rotating liner cementing technology can significantly improve the cementing quality, which has gained more and more attention from domestic cementing industry. Through sufficient ground tests and underground simulation tests, it has been proved that all technical parameters of the rotating liner cementing tool developed by SINOPEC Shelfoil Petroleum Equipment & Services Co., Ltd were consistent with the design and that the tool could be put into industrial application. Taking 11NC-1 well in Shengli Chengbei Offshore Oilfield for example, this paper analyzes its cementation and completion scheme and technical difficulties, site preparation and construction situation. The superior cementing quality marks the successful application of Shelf® rotating liner cementing technology in Chengbei Oil Field.

Abstract: In this study, two environmental remediation technologies, surfactant washing and photocatalytic oxidation, have been investigated to remove and decompose phenanthrene (Phe) and pyrene (Pry). Aqueous solutions containing the anionic surfactant sodium dodecyl benzene sulfonate (SDBS) and the nonionic surfactant Tween-80 (TW-80) were used to extract the contaminants from the soil samples. The effects of concentration of surfactant, washing time and temperature on the desorption efficiency of the contaminants from soil samples were studied. The photocatalytic oxidation treatment of the obtained washing wastes, performed in the presence of Fenton-TiO₂ suspensions irradiated with a 250W high pressure mercury lamp, showed an effective abatement of the two kinds of polycyclic aromatic hydrocarbons (PAHs) due to the relevant concentrations of organics in the waste. This study demonstrates the two-stage progress process can be an effective treatment method for PAHs not only desorption by soil washing but also degradation by photocatalytic oxidation.

Abstract: Since 2001, the population at the second biggest city of Thailand, Nakhonratchasima has increased more than 10 %, this lead to generate a substantial volume of solid waste. In this situation creates two distinct problems: (i) a lack of cleanliness around the city; and (ii) solid waste disposal. Approximately 189 tonnes of solid waste are generated each day in the city municipality of Nakhonratchasima. Collected waste is currently disposed to an open landfill located on the citys outskirts. The landfill is located at the former waste water treatment oxidation ponds of a starch factory and has an area of 302,000 m². In addition to the 180 tones of domestic waste, another 20 tones of industrial waste are land-filled each day. It is known that the main problem of landslide in Municipal Solid Waste (MSW) come from unstable of slope that caused by height [1,2] and rainfall infiltration condition [3,.The MSW and related research of the slpoe stability of MSW are in the early stage in Thailand and has no standards to control its landfills and rereutlization. Thus, the objective of this study is to investigate the probability slope stability analysis of MSW landfill slope by consider with MSW height and rainfall infiltration condition. This study is conducted using laboratory data and Monte Carlo Simulations (MCS) are carried out to obtain reliability index (β) and probability of failure (P_f) for the stability of landfill slope. The result shown the 2 cases, the first case is investigated on slope 1 : 2 (10 m. Height) and the second case is slope 1:2 (15 m. Height). Two case studies will find out the effect on the rainfall infiltration condition increase40% 60% and 80% of unit weight.

Abstract: According to the investigation on the environmental pollution and vegetation conditions of Waitoushan Iron Mine of Benxi Steel Group Corporation, this paper discusses the ecological vegetation restoration of mine, makes the plans for short-term and long-term vegetation restoration, researches on the basic principles, ways, silvicultural techniques of short-term vegetation restoration. Wherein, the stability control of mine refuse dump is the precondition of vegetation restoration, the improvement of soil matrix is foundation, and the screening of vegetation varieties is the key to the success of vegetation restoration. The theoretical basis is provided for the construction of long-term mine ecological park.