Applied Mechanics and Materials Vols. 580-583

Abstract: In the study of reservoir geo-modeling in Ticleni oilfield, structural model, the spatial framework of the geo-model was firstly constructed based on seismic and petrophysical data and integrated geological background analysis. Then the variogram function was analyzed based on petrophysical data and sedimentary setting analysis, and the litholofacies model was established. Finally, the property models were constructed with reservoir physical property controlled by lithofacies model. Therefore, the quantification of geological study achievements and the distribution of reservoir physical property are effectively combined, which provides the foundation for the sequent reservoir development of Section07.

Abstract: This paper takes the No. 1 ore body of Jinchuan 3rd mining area as an example, obtains the corresponding relation of surrounding rock quality evaluation index and spatial location.Through RMR rock classification method , using Rockware modeling system and limited geological informations, the statistical analysis of RMR and RQD showed that the rock of No. 1 ore body belongs to III~V type. Its rock mass is between normal to unstable. Through Rockware modeling system, we established the 3D rock properties model of UCS, RQD and RMR, and found that in the 5 to 6 rows of east hanging wall exists rock not conducive to the block caving method which belongs to the type of V. Finally, Statistical analysis was made based on the numerical model of strata. We find that , basically ,the rock block has good cavability because it belongs to the IV type of rock masses. However when design blocks and manage drawing, we must pay particular attention to the III type of rock, which is of moderate stability, and the V type of rock, which is less stable. All of these make a useful exploration for the research of key technology in the field of the interior of the earth.

Abstract: Qinglong landslide is a very typical landslide in the central region of Yunnan Province water source diversion reservoir area of the Jinsha River. The geological background of the landslide region is introduced,including Landform, stratum lithology and geological structure and hydrogeological condition. Based on the collected geological data and according to the results of site investigation, the complete picture of Qinglong landslide is provided. Then the image of 3d vision is made. The longitudinal profile and cross-sectional profile are drawn. At last, The genesis mechanism of Qinglong landslide is analyzed from the point of landform, Rock mass structure and Geological structure. The study is helpful to understand the status of other landslides and can provide the basis of appraisal of reservoir bank stability.

Abstract: The basic physical and mechanical characteristics of Clay shale in Bayingobi Basin of Inner Mongolia have been investigated by using supersonic testing system, rock mechanical testing system, and rock triaxial testing system. The results indicate that the deep clay shale of this region is characterized by high density, high mechanical strength, low deformation and strong brittleness. More specifically, according to the tests, because of their relative small particle size, the carbonate grains of clay rocks in this region are distributed more uniformly, and the average clay mineral content is comparatively low, as a result, the deep clay shale of this region are featured by large internal friction angle and high mechanical strength.

Abstract: Architectures of fault systems play important role in stability and mechanics of rock mass. While growth mechanism of faults is intrinsic controler for architectures of fault systems. This paper presents a case on faulting in the dam area of an oversized hydropower in Southwestern China. The faults in this area are mostly strike-slip faults with shallow brittle deformation characters, extending tens to hundreds of meters. These faults can be divided into four groups which are formed during two generations corresponds to two periods of tectonic events. Growth model of these faults have been built based on geologic and mechanic data. The first generation of faults was formed based on preexisting joints. While the secondary generation emerge only if the existing faults become critically misaligned during rotation of the primary stresses. The criterion laws for formation of secondary faults are suggested. According to the growth model, we can predict placement of secondary faults in space. Conversely, when geometry and space characters of the fault systems are known, we can estimate mechanic parameters and tectonic environments of the rock mass.

Abstract: Due to the early years of mining makes Gob fracture zone, the deformation of rock fracture zone, and gradually developed through. Located in the mined-out area causing tension within fractured zone of discontinuous deformation region arsenal varying degrees of ground and walls to crack, great security risk to the normal operation of the arsenal caused. Project uses Sleeve Valve Pipe and Steel Pipe Micropile reinforcement scheme. This paper describes the details of the reinforcement mechanism, the construction process, technical requirements and quality assurance measures. Practice has proved that the joint reinforcement program can continue to crack the wall of effective governance to ensure the safe operation of the security arsenal.

Abstract: Concepts of flow permeability, flow permeability coefficient and flow porosity were presented to investigate changes of permeability and porosity of mudding weak permeability media with nonlinear flow. Formulas of flow permeability, flow permeability coefficient and flow porosity were presented to study the evolution characteristics. Results show that permeability and porosity of mudding weak permeability media nonlinear flow increase with pressure gradient or hydraulic gradient of nonlinear flow, while permeability and porosity of high permeability media Darcy flow are constant. The results can provide a test and calculation of micro porosity with a new method and can provide engineering safety of mudding weak permeability media nonlinear flow with scientific basis.

Abstract: Considering rock joints, the discrete element method was used to study gypsum mine surface short-term and long-term stability. Filling method and caving method were selected as the surface treatment. Through comparison, Caving method is more suitable for handling the gob of gypsum mine. Surface movement angle and subsidence angle were obtained on the basis of the plastic zone, surface tilt rate and surface horizontal strain, and whereby draw a goaf risk areas to guide residential relocation. The research methods and conclusions in this paper can provide reference for the study of the empty area stability in gypsum mining currently.

Abstract: SOC as a significant quantity for the global carbon cycle, makes great sense in soil management and future climate scenario. With more and more researches carried out on SOC, methods used to the determination of SOC have being formed: automated analyzer, LOI and some others, such as using climate change information and remote sensing technique. The objective of this paper is to discuss advantages and disadvantages of automated analyzer (C-N analyzer) and LOI, and provide some references in selecting the appropriate measuring methods of SOC for the readers.

Abstract: Volumetric joint countis an important parameter to evaluate the development of fractures. It is a fundamental representative for the strength and permeability of rock masses. However, cannot be directly measured in field. In this study, an indirect method is applied for its estimation. The main procedures are as follows: firstly, the volumetric joint frequencyis assumed for th fracture set, and then a series of 3D stochastic discrete fracture networks (DFNs) are generated using the Monte Carlo method according to; secondly, a survey line is drawn perpendicular to the fracture set in the each fracture network generated, the fracture spacing is measured along the survey line, then the average fracture spacing and its variance coefficient are calculated from all the DFNs; thirdly, by repeating the above two steps for differentassumed, the relevant average fracture spacing and its variance coefficient are obtained, and two relation curves are built up between and the average fracture spacing (or its variance coefficient); fourth, the exactis estimated through this relation curve between and the average fracture spacing according to the exact fracture spacing measured in situ; finally,is calculated by summing the exactof all fracture sets up. In this study, this indirect method is applied in the rock masses of Xiaowan Hydropower Station. The result shows that the fracture spacing will reduce and its variation coefficient becomes stable asincreases.