Applied Mechanics and Materials Vols. 170-173

Abstract: Based on field geological survey, engineering geological investigation and other related analysis to the Xiaonanhai Rockfall triggered by the Qianjiang Ms 6.3 Earthquake in 1856, principal characteristics and failure mechanism of the rockfall is elaborated. It is held that its forming process consists of four steps, namely weathering and denudation, shocking and projecting, collapse-slide accumulating and dammed lake formation. It shows that the mass is a result of comprehensive action including seismotectonic moving and field stress, rock mass structure, topography and geomorphology, seismic wave. First of all, rock mass near both Dakuayan and Xiaokuayan which developed three groups tectonic joints forming “X” shape collapsed respectively towards their free faces, about 145º~155º direction. Secondly, diameters of rock blocks in accumulation body decrease from northwest to southeast along 150º direction, and it proves indirectly that the direction of rock mass ejecting is along the same direction.

Abstract: Based on the S202 a typical section of the geological hazard investigation and the study of fuzzy comprehensive judgement method, this paper make the comprehensive evaluation of geological hazard, and then it makes a partition evaluation ,provides the basis for the section roads of the geological disaster prevention.

Abstract: Based on project practice, this paper in detailed studies the design and calculation process of block gravity dam in debris flow by researching related standards.

Abstract: Volcanic rocks of Early Cretaceous Yixian Formation were widely distributed in western Liaoning. The Yixian Formation in the Chaoyang basin can be divided into two subcycles from bottom to top. The first subcycle is composed of basalt, basalt andesite and andesite. The second subcycle is composed of trachyandensite and trachyte. The volcanic rocks are characterized by high SiO2, Al2O3, K2O and Na2O, and comparatively low TiO2 components. The volcanic rocks are obviously enriched in incompatible elements (K, Rb, Sr, Zr, Ba, Pb, Li etc.), and depleted in compatible elements (Co, Ni, Cr, V etc.). The volcanic rocks are rich in LREE. There is a slight low Eu negative abnormality and low Ce negative abnormality. Based on t he studies of petrology and geochemistry, volcanic rocks of Yixian Formation belong to the high-K calc-alkaline magmatic serious. Comprehensive study of regional structures and geochemistry of volcanic rocks, the volcanic rocks of Yixian Formation were generated in the environment of lithosphere inhomogeneous extension, as a product of the intraplate orogeny of Yanshan Mountains.

Abstract: It is well-known that land subsidence seriously affects the regional social and economic development and becomes a world-wide problem. Xixi-Chengnan district, Jiangsu province is one of the most important area affected by land subsidence in China. The damage of the hazard to physical, social, economical and environmental systems has been increasing during recent years, which mainly caused by the long period groundwater overexpolitation in the area. This research presents a vulnerability assessment model based on grey correlation analysis (GCA) for the regional land subsidence in Xixi-Chengnan district of Jiangsu province, by the assessment results, the rank of relative vulnerability of each township in the study area can be obtained without weighting and aggregating the vulnerbaility indicators and with avoiding the subjectivity of weighting in general vulnerability evaluation methods. The study can be expected to raise public awareness of land subsidence risk and vulnerability, lay the foundation for risk decision-making, and provide theories and technological supports for taking comprehensive and active measures to prevent and alleviate land subsidence vulnerability.

Abstract: According to sediment rates of slurries in initial stages, permeability coefficients of samples applied in this article is obtained. It shows that the permeability coefficients of dredged slurry determined from sedimentation tests are feasible. In bi-logarithm coordinates, permeability coefficients of dredged slurries increase linearly with the increasing of void ratio. Permeability coefficients, however, increase abruptly when slurries change from soil state into fluid state. At last, a model on the relationship between void ratio and permeability coefficients of dredged slurries is obtained.

Abstract: 40110 working face is arranged as the third Mechanized sublevel caving mining face in the 401 east-wing area along the coal seam by Dafosi company of the Binchang Mining Group Corporation. According to the conclusion based on the research about Binchang area coal geology not only shows the roof and floor lithology, structure, hydrology, the gas, dust features and so on but also proposes mining roadway supporting schemes and putting them into practice. Practical application shows that roadway supporting schemes effectively control the two-sided displacement and relative movement of the roof and floor to ensure the daily production of coal mine.

Abstract: When the vacuum preloading method is applied to improve dredge fill, adequate bearing capacity has be provided for the PVD installation equipment. It is found that filling the dredge surface with a certain think of silt sand can provide enough bearing capacity to support the PVD installation performance. A small scale model test is carried out, which can intuitively demonstrate the effect of this technique. Finite element analysis is performed in which the developing of the plastic zones and the displace vectors can be predicted. The calculated bearing capacity is compared with the conventional analytical solutions achieved by Vesic. The bearing characteristics of the soft soil foundation with a crust layer is discussed, which can provide the technique with a solid theoretical background.

Abstract: stability analysis is the base for control the loess high slope in loess area. on the assumption of arc-model in below segment, straight slip surface in model, uprightness in the up sect, a general expression of safety factor for Step-shaped Cutting High Loess Slope is deduced According to the balance of force and torque balance. Regard the parameters of the intersection of arc and line coordinates of the location and the inclination of the line segment as variable, the loess high slope stability analysis are programmed, he automation of the calculation is achieved. This method is verified by k202+020～k202+158 loess high slipe in Huangling –YAN’AN expressway.

Abstract: Along with analysis of logging facies characteristics of drilled wells, isometric strata slicing technique for seismic attribute is applied to interpret the distribution of the depositional systems in the study area. It is understood that Nenjiang3 Formation in Xinbei area of Xinli field consists of water regressive and sand progressive delta front depositional system from bottom to top. Combined with analogue analysis of well logging facies and planar seismic attributes, it is learned that sediments generally came from the north area, and main sedimentary microfacies include underwater distributary channels, river mouth bars, sheet sands body and interdistributary bays of delta front. With isometric slicing for the extraction of seismic attributes and logging operation, the distribution rules for sedimentary systems could analyzed, thereby providing a feasible method that could be referenced by the study on sedimentary system distribution of other areas.