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Dynamic Behavior and Mechanism Analysis of Structural Clay under Traffic Loading

Author: JiangYan
Tutor: LeiHuaYang
School: Tianjin University
Course: Structural Engineering
Keywords: Structural soft soils Traffic load Structural strength Dynamic triaxial test Mercury test
CLC: U412.22
Type: Master's thesis
Year: 2007
Downloads: 296
Quote: 2
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Abstract


With the rapid development of China's urban transportation, traffic loads geotechnical problems caused by growing concern for people. Many scholars of saturated clay under traffic load strength properties and deformation characteristics of a lot of research, but often have stayed at the macro-mechanical point of view, for the cause macroscopic structural dynamic response of soft soil microstructure little studied. Therefore, to fully and accurately reflect the complex stress (initial stress cyclic loading) under the conditions of real dynamic characteristics of soft soil must be deep and detailed mechanical properties testing and observation, based on strengthening the meso group on soil structure and physical mechanism, strengthen the soil under cyclic loading and unloading volume contraction recoverable dilatancy studies to reveal the structure of soil meso group change its macroscopic mechanical response of the quantitative relationship between, revealing soil dilatancy, anisotropy and structural joint exists between the physical basis for the development of physical concepts correct mathematical formulation is simple, easy to measure the dynamic parameters of the constitutive model. In this paper, on the basis of previous studies, focusing on traffic loads to carry out structural clay Experimental study on dynamic characteristics, and from the microscopic point of view to be in-depth analysis, including the following aspects: 1. Physical and mechanical properties through the indoor test, analysis Tianjin Tanggu District typical silty clay static mechanical properties of the class focuses on the effects of soil structure, the use of mathematical models invert the value of its structural strength. (2) using half-sine shaped simulated traffic loads through dynamic triaxial tests to study the dynamic strength of structural soft soil characteristics determine the structural soft soils critical dynamic stress ratio and threshold dynamic stress ratio, got its dynamic strength indicators and their variation, while taking advantage of test results reflect the dynamics presents a characteristic pore pressure model. 3 using different stress paths dynamic triaxial tests simulate traffic load for the role of structural soft soils studied structural soft soil under different consolidation methods, different vibrational frequencies, different vibration waveform dynamic stress strain relation, study found that the dynamic structural soft soils meet the hyperbolic relationship between stress-strain curve obtained in the consolidation of the structural soft soils in different ways, different vibration frequency, vibration waveform different soil under dynamic loads maximum dynamic elastic modulus E < sub> max d and maximum dynamic shear modulus G maxd . 4 In response to these findings, the use of quantitative microstructural analysis revealed macroscopic mechanical behavior of the microscopic mechanism, using the test methods for the mercury test, through the structural soft soils before and after the destruction of the traffic load variation of pore size distribution analyzes structured soils under traffic load in dynamic characteristics of microscopic mechanism.

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CLC: > Transportation > Road transport > Road works > Planning, surveying and design > Survey > Soil,geological and geographical investigation
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