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Applied Mechanics and Materials Vols. 170-173
Paper Title Page
Abstract: In geotechnical engineering such as supporting of deep and soft rock roadway ,oil drilling , and construction of military underground defensive facility, thermodynamic properties of soft sedimentary rock has guiding significances .The study of the thermal constitutive behavior of rock under temperature has been done for many years, and many achievement have been got on this issue. In this paper, some experimental researches on the thermo-mechanical characteristics of soft sedimentary rock have been presented. Some test results have been simulated with a thermo-elasto-viscoplastic model. The results show that the proposed thermo-elasto-viscoplastic model reflects the visco-elastoplastic properties of rock,and can describe the thermo-mechanical behaviors of soft shale rocks in not only drained conventional triaxial compression tests but also drained triaxial creep tests. So it can be used for analysis of theology and stability of rock engineering.
687
An Improved Finite Element Method of Rock Stress Field Back Analysis Coupling with Genetic Algorithm
Abstract: Aiming at the deficiencies of traditional linear optimization methods in back analyzing, an improved finite element method of rock stress field back analysis coupling with genetic algorithm is put forward, in which the finite element analysis is embedded in genetic algorithm as a single module and rock stress field is gotten by nonlinear solution. Then an assumed geological cross-section is taken for an example to verify its validity. The result demonstrates that the back analyzed stresses of all the measuring points are in good agreement with the measured ones and the relative error is very small, which verifies the feasibility and effectiveness of the proposed method.
692
Abstract: This study examines the effect of particle size on the behaviors of triaxial sand specimens. In order to investigate the material behaviors (i.e., local void ratios and inter-particle contacts) as well as the mechanical behaviors, three numerical triaxial tests assigned with different particle size ranges were performed. The results showed that the specimen with uniform particle sizes exhibited higher strength, larger local void ratios and more inter-particle contacts than the specimen of wider size ranges.
696
Abstract: While the elasto-plastic finite element method based on the shear strength reduction(SSR) technique is employed to analyze slope stability, the overall factor of safety computed numerically is,in a certain degree,dependent on the failure criteria used for evaluating critical instability condition of slope. In the present paper, the connectivity of plastic zone criterion is chosen with its close physical meaning to the LEM , and the farther 3D critical slip surface searching procedure is presented. The results of stability analysis of a certain initial quarry slope show that the chosen failure criterion and the 3D critical slip surface searching procedure is reasonable and can be widely applied to slope engineering practice.
700
Abstract: By means of laboratory tests and theoretical calculation, the physical, mechanical properties and compaction mechanism of the wind-blown sand are studied to deal with the problem of how to use the wind-blown sand as roadbed materials. It is revealed that water content doesn’t affect the compressibility and the shear strength of the wind-blown sand obviously and the wind-blown sand can be compacted both in dry and wet conditions. The compaction curve of the ordinary fine sand is consistent with that of wind-blown sand and the main factors affecting the compaction properties are the grain composition, water content and compaction work.
706
Abstract: Pseudo static method is a common method in the research of pile-soil interaction. In this paper pseudo static method was major introduced, the p-y relationship of saturated degraded soil was applied to Winkler foundation beam model to perform pseudo static calculations on the basis of previous studies. Through the practical calculation of test data in literature [1], the feasibility of this method was verified.
710
Abstract: Aiming at the supporting problems of inner shift lining of freezing shaft in the deep thick aquiferous soft rock of west area in China,the test result of frost heaving indicates:the frost heave of rack in west area is feeble,and freezing pressure is small,the design of outer lining mainly suffices thick require of thick wall cylinder structure .First, the model of reinforced concrete is designed and the test pieces are manufactured according to simlilarity theory, then,through loading test, the stress,strain and strength characteristics of this shaft lining structure are gained.the studied results can provide a reference for engineering application of this shaft lining structure.
714
Abstract: Experiments were performed by using an improved test system of physical parameters of rock materials. Influence of effective stress, temperature and flow velocity of fluid on permeability or porosity of tight rock materials under high temperature and high pressure was investigated. A micro-mechanism was given to interpret changes of the permeability or the porosity by means of a microscopic imaging method. Results show that the permeability decreases with an increase in effective stress or temperature and increases with an increase in flow velocity of fluid, and that relative change of the porosity increases with an increase of effective stress and is not detectable with an increase in temperature. The main reasons for the above changes are nonlinear flow and narrowing of micro-cracks under action of effective stress or thermal effects. Changes of the micro-cracks play a more important role in the permeability than in the porosity. The results can provide engineering geological disposal of high level radioactive waste with basis.
719
Abstract: Due to lacking of explicitly analytical model, optimization design of complex slope is often consulted to enumerative algorithm which generally results huge computation efforts. To overcome this problem, a new optimization method based on improved response surface (IRS) is proposed. The IRS, constructed by uniform design (UD) and non-parametric regression (NR), provides a regressed and explicitly analytical model through a few trial computations without prior assumed sliding surface. The optimization process is explained and a slope is optimized to verify the feasibility of the proposed method. The results show that the provided method can optimize a slope with multiple sliding surfaces and provide an optimum result under the safety constraints of the slope. Meanwhile, the introduction of UD and NR to construct the IRS can provide a better regression effect with fewer computational costs.
723
Abstract: Back analysis of displacement is an effective method for parameter recognition in geotechnical engineering. As rock and soil are complex geological materials, the relationship between the mechanical parameters of slope sliding mass and its displacement is incompletely quantified and highly nonlinear, but traditional back analysis of displacement has poor adaptability for this. So in this paper an integrating method of genetic algorithm, neural network and numerical analysis (GA-NN) is presented to carry out back analysis for mechanical parameters of slope sliding mass, and procedures to perform the intelligent back analysis are described in detail. Finally, this new method is applied and verified by a practical landslide in the reservoir area of Three Gorges, the results indicate the method is efficient for determination of mechanical parameters of sliding mass.
729