Bearing capacity of around unconfined cube soil using numerial analysis method
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Bearing capacity of cube soil under the slabs of slabs underpinning method belongs to three-dimensional slope stability problems. Pressing steady ultimate bearing capacity of several familiar soils is obtained through top pressing three-dimensional ANSYS analysis of single block soil or cinquefoil soil. With soils changing from clay to silt and depth of digging soil increasing, the pressing steady ultimate load bearing capacity decrease gradually. With top press of the soil increasing, through the change of soil displacement isoline the following conclusions can be arrived: the scope of maximal displacement zone developing from initial rotundity which diameter equals to cube hemline to ellipse overlapping whole computation scope, and near ultimate load bearing capacity the shape of maximal displacement zone approaches to sliding surface curves of Prandtl.Keywords:
Silt
Cube (algebra)
The effect of continued equal channel angular pressing(ECAP) with different pressing routes on the deformation homogeneity of structure is investigated by using 3D finite element models.The equivalent plastic strains on the section of specimens using different pressing routes are compared and it is seemed that the deformation distribution is more homogenous after two passes using pressing route C.But from the analysis of deformation character,it can be deduced that the pressing route BC is the most effective for deformation homogeneity after multi-pressing as long as the total pressing passes are times of four.It means that this route is the most favorable for achieving ultra-fine grained material with more homogenous microstructure.The above deduce is ultimately proved by the simulation results of four passes of ECAP process.
Severe Plastic Deformation
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Equal Channel Angular Pressing (ECAP) is one of ultra-fine grain preparing techniques,which can refine the structure of alloys and improve the capacities of materials.The results show that the tensile strength of pure aluminum L2 increases with pressing times of ECAP and reach its limit after pressing 8 times.The elongation decreases severely from 40% to 15% after the first pressing,but it increases slightly after 4 or 5 times pressing.The hardness also increases with pressing times and reaches saturated appearance after pressing 3 or 4 times.with increase of the pressing times,the initial grains of pure aluminum L2 with about 1 mm equiaxed grains change into fine equiaxed grains.The size of grains is approximately 1 μm after pressing 8 times.
Equiaxed crystals
Elongation
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Abstract Ultrafine grained material was produced by equal channel angular pressing and confined channel die pressing. Microstructure and mechanical properties of the obtained samples were compared. The different effects on microstructure evolution and mechanical properties from both processes are discussed.
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Through analysis of the SEM experiment on the retem pering silt with di fferent clay contents and at different times, the writer introduces the variatio n law of silt's micro structure and the relationship between silt's micro stru ct ure and it's anti liquefaction. Through analyzing the silt's micro photo, the wr iter draws the conclusion that the micro structural characteristics of the silt with natural grains of clay varies when it's clay contents amount to Pc=9%, which is one of the turning points where the silt's characteristics change.
Silt
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The overyear average amount of silt deposit in Dongting Lake is as high as 13×10~7 t, Long-term silt deposit contribute to special ecological environment. The special circumstance and destructive activities of people accelerated the speed of silt deposit broke the balance of ecological system, and formed secondary disastrous environment. Subsquently, the abnormal change of environment amplified the impact of silt deposit, result in the format and cocurrence of disasfrous chains in the final analysis, the gradual formation process of disastrous chains all originated from the long-term silt deposit.
Silt
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There is a mass of silt distributing at the shallow stratum in the area of Zhengzhou,and it is important to elicit the bearing capacity of silt in project design.Some typical examples of the geotechnical reconnaissance in Zhengzhou are analyzed,determine the bearing capacity of silt.By numeration SPT-parameters and load tests,approximate linearity in original test and silt relativity are found within the dust-test parameters and the bearing capacity.Formulas of the bearing capacity are put forward by SPT and CPT for the reference in future projects.
Silt
Stratum
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Equal channel angular pressing, ECAP, is relatively a recent severe plastic deformation process which is carried out on materials to grain refine their structure. In this paper, the effect of addition of Mo to ZA22 on the maximum pressing force and the work consumed after the ECAP process is investigated and the obtained results are presented and discussed.
Severe Plastic Deformation
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