The back analysis of comprehensive deformation modulus of expressway roadbed by finite element method
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Finally , the strain composed method to calculate the settlement of the composite foundation was put forward when the pile - soil deformation harmony is discussed in the process of analysis of deformation modulus
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Abstract : the strength of reinforced soil is much influenced by deformation modulus and reinforced direction . a research and analysis of theory for this two factors by experiment is made . and some reference value for the application of structure of reinforced soil is given
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Through a lot of test pile material , this essay concludes the vertical bearing capacity calculation formula of man - made pile with bulb shaped base by strength theory and relative deformation as control criterion . the method of defining pedestal pile foundation deformation modulus is especially discussed in this article , and it takes the mindlin solution as the starting point using mathematics method to get the poisson ' s ratio ( u ) which is the factor influencing foundation soil deformation modulus , and a deformation modulus calculating equation is finally determined
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In this paper , depending on the enormous 356 pile testing date detailed with soil and pile parameters and p ~ s curves , covering xi ' an and adjacent areas , we analyzed the load transmission mechanism of pile in loess foundation , and proposed a kind of hyperbolic load transmission function between pile and it ' s neighboring soil . meanwhile , we created a mathematical model to predict p ~ s curve and bearing capacity of single pile . by analyzing the compacting effect caused by pile - sinking of pressed pile in loess and it ' s influence on bearing capacity and settlement , two parameters , kc and ke are introduced to modify the soil cohesive c and deformation modulus es
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In this paper , a numerical simulation is conducted , which is based on the test data of the model experiment of sloping ground with the help of the marc program . when the bearing capacity characters of level ground and the foundations adjacent to or above slopes are analyzed , the effect is considered , which includes deformation moduli , density , poisson ratio , angle of internal friction , stress - strain relationship , slope angle , relative distance from the edge of slopes and relative depth of footings
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Based on the idea of the measured displacement can be divided into elastic and plastic parts , elastic parameters can back analyzed by the elastic displacement , which is the measured instant after blasting excavation . the strength parameter can be got by plastic deformation , which is the measured during the period of construction loop without blasting excavation . lastly , depending on fenner formula , a new and valid evaluating criterion for tunnel stability is presented and the effect of deformation modulus , cohesion , internal friction angle and overburden can be considered
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The settlement is analyzed by using the settlement calculation theory already existed and the pile deformation modulus is researched under the different test conditions . it results in the different pile modulus of deformation that the pile side constraint is different because of the different testing conditions , so the settlement calculation for composite foundation of stone columns must use different computing modes based on the testing conditions
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The experiential formula between kc and base resistance q from cpt and , the relationship between ke and c # ( strength of concrete ) are also created by fitting 94 pressed pile testing date . based on analyzing the compacting effects caused by driving pile in loess and it ' s influence on bearing capacity and settlement , another two disturbance parameters , c and e , are proposed for multiplying respectively the parameters of soil cohesive c and deformation modulus es to reflect this effect . by fitting 51 driven pile testing date , we created an experiential formula between the e and r ( the modulus ratio between pile and surrounding soil ) , also an experiential formula between the c and base friction resistance fs / pa from cpt of pile surrounding soil
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