Sensitivity Analysis and 3 D-displacement Inversion of Rock Parameters for High Steep Slope in Open-pit Mining
Due to the complexity of multiple rocks and multiple parameters circumstance, various parameters are often reduced to only one parameter empirically to generalize geological conditions, ignoring the really influential parameters. A developed method was presented as a complement to 3D displacement inversion to obtain the relative important parameters under complex conditions with limited computational work. Furthermore, this method was applied to a high steep slope in open-pit mining to investigate field applicability of the developed system. Back analysis was conducted in the reality of the east open-pit working area of Daye Iron Mine and propositional steps were presented for parameters solving in complex circumstance. Firstly, multi-factor and single-factor sensitivity analysis were carried out to classify rock mass and mechanical parameters respectively according to the extent of their effects on deformations. Secondly, based on the results, main influence factors were selected as inversion parameters and taken into a 3D calculating model to get the displacement field and stress field, all of which would be the artificial network training samples together with inversion parameters. Thirdly, taking the real deformations as input for the trained back propagation (BP) neural network, the real material mechanical parameters could be obtained. Finally, the results of trained neural network have been confirmed by field monitoring data and provide a reference to obtain the matter parameters in complicated environment for other similar projects.
STUDY OF METHOD OF COMPREHENSIVE EVALUATION FOR PARAMETERS OF CONSTITUTIVE MODEL OF ROCK MASS
Due to the limit of single index in the analytical method of sensibility,comprehensive assessment model of attribute recognition based on entropy weight of sensitivity is obtained. The assessment method including various appraisal indexes is used to the global analysis of the sensibility of constitutive models parameters. Also,the method for the sensibility of constitutive model parameters may give a new access. By combing with cohesion weakening and frictional strengthening of brittle rock mass,the assessment method mentioned above is used for the sensibility analysis of constitutive model parameters of surrounding rock mass in the auxiliary tunnel of Jinping II hydropower station. The results show that the main influence factors on deformation and plastic zone of surrounding rock mass are final internal friction angle,initial cohesion and elastic modulus;the next are residual cohesion,critical plastic strain of internal friction angle,initial internal friction angle and critical plastic strain of cohesion;the minor influence factors are Poisson′s ratio and tensile strength. Based on the results,more attentions should be paid to final internal friction angle,initial cohesion and elastic modulus in similar positive and back analysis and studies in the auxiliary tunnel and diversion tunnel of Jinping II hydropower station.
AN INTRODUCTION T O THE SOILS OF THE SOUTH-EASTERN PORTION OF THE AUSTRALIAN ARID ZONE
Summary 
 
Seven soil regions, each of which is dominated by soils belonging to one or two great soil groups, are defined and mapped. The outstanding feature is the presence of a variety of soils with widely differing characteristics. The soils are deeper, have more profile differentiation and are finer-extured than those in most-arid regions and are frequently overlain by currently-forming deposits of wind-transported materials. Because the vegetative cover is better developed and there are only small areas of rocky hills and bare rock pediments, water erosion and deposition are not as prominent as in other arid areas.