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Study on Tests of Failure Criterion and Dynamic Properties of Silt under the Cyclic Loading

Author: ZhaoHui
Tutor: YuXiangJuan
School: Hohai University
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: Yunnan silt Traditional analysis Energy Analysis Method Failure criterion Dynamic strength Failure stress conditions Strain Pore ??pressure
CLC: TU442
Type: Master's thesis
Year: 2006
Downloads: 370
Quote: 5
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Abstract


Yunnan is located in the Indian plate and Eurasian plate collision with the east side, is one of the China's major seismic zone. The total land area of ??all in the fortified area of ??more than 6 degrees of seismic intensity, 7-9 degrees of intensity fortified area as large as 84%. In addition, Yunnan silt has its regional, its causes, physical and mechanical properties are quite different with the other parts of the silt. Therefore, through Yunnan the silt vibration triaxial tests, respectively, based on traditional analytical methods and energy analysis done some research standards and dynamic characteristics of Yunnan silt destruction. Dynamic triaxial test results show that: Yunnan silt only pressure consolidation conditions in order to achieve liquefaction standards, the limit equilibrium destroy strain of 5.0% before or after reached with the consolidation conditions. Consolidation ratio of 1.0, 1.5, limit equilibrium destruction reached before the strain of 5.0%, and the consolidation ratio of 2.0, and vice versa. Dynamic strength and breaking stress conditions based on the traditional methods Yunnan silt different failure criterion studies have shown that: 1) When the failure criterion is selected, the initial stress state is an important factor affecting soil strength. 2) the same consolidation ratio, the failure criterion on the dynamic strength of the destruction of vibration times increase reduced. 3) Yunnan silt maximum round-trip shearing surface strain undermine standards and limit equilibrium failure criterion failure stress conditions can be expressed by a quadratic polynomial. Yunnan silt dynamic strain and dynamic pore pressure based on conventional analysis methods are discussed, results showed that the boundaries of the different failure criteria pore water pressure and initial static stress state and dynamic loading strength, and the average stress deviator stress ratio, and in going to and returning from the axis there is a good regression relationship between stress. Consider anisotropic consolidation Yunnan silt dynamic strain and dynamic pore water pressure and the establishment of a development model, and the model parameters and mean stress, migraine stress ratio and dynamic stress fitting to consider the initial static stress and dynamic load dynamic strain and dynamic pore water pressure increase of the impact of the law. Yunnan silt liquefaction process research show that: 1) Yunnan silt stress - strain hysteresis loop shape gradually to the development similar to the parallelogram shape and stabilize at a later stage only the axial strain amplitude increase. 2) Yunnan silt dilatancy occurs in the axial tensile force stage into the dilatancy stage, the situation is different with sand. The inference is caused by two soil particles. Computer automatically collected by dynamic triaxial test stress-strain data, draw hysteresis loop, find the area of ??the depletion of energy of vibration times. On this basis, the boundaries of the Yunnan silt accumulated depletion of energy, dynamic strain and dynamic pore water pressure and discusses the relationship between cumulative depletion of energy, results showed that: 1) the boundaries of cumulative wear and tear there was a significant regression relationship between energy and destruction vibration times. 2) When the failure criterion is selected, the boundaries of accumulated depletion of energy and mean stress, the partial stress ratio and dynamic the better regression relationship between the stress. 3) pressure or anisotropic consolidation conditions, the development of Yunnan silt dynamic strain and dynamic pore water pressure is closely related to growth and cumulative depletion of energy, which were established strain and pore pressure increasing energy mode, taking into account the initial static stress and dynamic stress.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Various types of soil and foundation > Adhesion ( cohesive ) soil and foundation
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