外文翻譯---軟土路基沉降計(jì)算問(wèn)題探討-其他專(zhuān)業(yè)(編輯修改稿)
2025-02-24 09:45 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 pressibility than soil nonlinear variation and gravity stress and other factors, a reasonable Terzaghi 1d consolidation theory. stress path method Lambe (1967) proposed with stress path method to calculate settlement sichuan. Soft soil after by load variable, often have two process: first is the deformation, the n is the volume change. Add lotus initial, pore water temporary too late eduction, pore water pressure rise, this is equivalent to the consolidated undrained process, its volume. Along with the pore water pressure lifts, and volume Compression, the effective method to stress increases, and partial stress is changeless, the equivalent of consolidation drainage process. Therefore, settlement can be divided into two parts by simulation calculation, the actual add lotus conditions, indoor consolidated undrained and consolidation drainage experiment measured respectively undrained strain and drainage strain, thus seek undrained settlement and consolidation drainage settlement. The stress path method to understanding subsidence mechanisms in the conventional calculation, analysis of possible error trend, are very beneficial. But the more troublesome, test technology used too high, has yet to be required by engineering. finite element method Finite element method can consider plex boundary conditions, soil stressstrain relationship nonlinear characteristics of stress, soil water and the skeleton history, the disaster of the stress field gather the effect, can simulate uploaded and lotus and processing super filling problem, can consider the lateral deformation, the influence of 3d seepage settlement of any time, and can seek settlement, the pore stress and horizontal displacement, effective stress changes, made putation ine total settlement quantity and sedimentation rate results such as getting closer to the measured results sichuan. Finite element analysis, will embankment and foundation as a whole grid, take into vertical displacement and stress, pore to displacement as basic level, the unknown variables are more strict theoretical than Mr Consolidation theory, in embankment loads, according to the soil strength degree and permeability, thus to establish equations solution pore pressure and displacement. Finite element is really a kind of relatively perfect method, but because its calculations, and need to pass triaxial test to determine, program for general plex engineering design personnel to accept, in practical projects don39。t get universal application, can only be used for important engineering, important section of embankment settlement calculation. In addition, the finite element it is hard to consider large deformation consolidation problem is the geometrical nonlinearity, often making the calculation results deviation is bigger. curvefitting method Based on the scene early measured settlement material, use curvefitting method which can predict the development regularity, settlement of calculates final subsidence and then define paving roadways time. Curvefitting method, a index curve GaoMuJun hyperbola method, the method of interface or have countries GaoMuJun corvee 1975 proposed dielectric improvement method, etc. Highway soft soil subgrade settlement over time with the relationship is generally hyperbola form diagram. But also somebody thinks hyperbolic equation itself did not reflect the consolidation of foundation soil, and subsidence rate speed with lack of the intrinsic relation and exponential curve method more appropriate fitting. Slaughter Mang think these methods are gold of the whole process of the settlement and to reflect the relationship, suggest using time prediction settlement curve poisson, but also is only applicable to the level 1 linear loading conditions. inversion analysis Inversion analysis is developed nearly ten years, a n
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