The consolidation of earth and rock dam foundations and its effect on stability is a key concern in water conservancy and water transportation projects. It is common to use the vacuum combined pre-pressure method to deal with soft ground foundation, where the reasonable selection of soil consolidation coefficient is one of the important factors to determine the success of the project. In this paper, numerical simulation is used to study the strength law of soil and rock dam foundation under different consolidation coefficients of soft ground, and the corresponding stability coefficients of soil and rock dam are obtained. On this basis, the reinforcement effect of an additional counter pressure platform is proposed and analyzed. The results show that the larger the consolidation coefficient of soft ground is, the more it is conducive to the growth of the strength of the soft soil layer and can effectively improve the stability coefficient of the earth and rock dam. At the same time, the additional counter-pressure platform has a certain effect on the overall stability enhancement of the earth and rock dam. The research results can provide a reference for the application of vacuum combined pre-pressure method to earth and rock dam projects.
aiming at the problem that along a special passenger railway line, the soft soil foundation is widely distributed and the thickness is generally quite deep, leading to diverse foundation reinforcement methods, and in order to ensure required stability and post-construction settlement of soft subgrade, field tests of surcharge pre-loading were carried out in concurrence with field observations. The generalized Kelvin rheological model was employed for foundation parameter inversion and numerical simulation on track-laying construction as well as post-construction settlement prediction were also performed. Results of numerical inversion showed that the foundation parameters were reasonable and reliable and the post-construction settlement was significantly reduced after three months of pre-loading. Several influential factors related to post-construction settlement are highlighted including standing time after roadbed completion, pre-loading height and pre-loading time. it shows that the longer the standing time, the smaller the settlement, and an increase in pre-loading height and time may accelerate the foundation consolidation, thus reducing post-construction settlement.
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