Abstract
This study investigates the seepage and deformation characteristics of carbonaceous mudstone coarse-grained soil embankment with different gradations under the action of dynamic load and rainfall. An indoor geotechnical test is conducted, and the mechanical parameters of carbonaceous mudstone coarse-grained soil with different gradations are analyzed. A numerical calculation model of seepage and dynamic characteristics of carbonaceous mudstone coarse-grained soil embankment is established on the basis of the test data. The different effects of rainfall infiltration and vehicle load are evaluated. The seepage, settlement, and slope stability evolution characteristics of graded carbonaceous mudstone coarse-grained soil embankment slope are studied. Results show that under the condition of the same rainfall time, the greater the nonuniformity coefficient, the faster the decrease in pore water pressure of the coarse-grained soil embankment at the same monitoring point. The seepage velocity vector in the embankment is concentrated below the soil shoulder. The smaller the saturated permeability coefficient and saturated water content, the larger the seepage velocity vector. The greater the nonuniformity coefficient, the larger the coarse-grained soil embankment under vehicle load. The smaller the embankment settlement, the lower the safety factor of embankment. The safety factor decreases slowly at first and then decreases rapidly in the whole study period under the effect of dynamic wetting. The research results provide a theoretical reference for the practical engineering application of carbonaceous mudstone coarse-grained soil embankment in rainy areas.
Highlights
Carbonaceous mudstone is widely distributed in southwest China [1, 2]
Considering this problem, scholars at home and abroad have conducted numerous research and considered that the influence of seepage and dynamic load on embankment is mainly reflected in the following aspects: (1) the change in matric suction of unsaturated soil is mainly caused by gradation [5]; (2) the seepage flow along the embankment slope direction during rainfall infiltration increases the overall sliding force of the slope [6, 7]; (3) the rainfall infiltration reduces the matric suction of unsaturated soil, and mass suction leads to the decrease in soil shear strength [8]
Erefore, the hydraulic and physical properties of carbonaceous mudstone coarse-grained soil embankment filling with different gradations are compared to investigate the deformation characteristics of carbonaceous mudstone filling with different gradations. is process can verify the feasibility of carbonaceous mudstone coarse-grained soil filling road and determine the feasibility of the project. e best graded carbonaceous mudstone coarse-grained soil embankment is determined in the project
Summary
Carbonaceous mudstone is widely distributed in southwest China [1, 2]. It was often discarded as bad filling material in highway construction in the past due to its strong water resistance, easy weathering, low strength, and large deformation. Erefore, the hydraulic and physical properties of carbonaceous mudstone coarse-grained soil embankment filling with different gradations are compared to investigate the deformation characteristics of carbonaceous mudstone filling with different gradations. Relevant scholars have conducted many studies on the mechanical properties of carbonaceous mudstone They only consider the influence of rainfall or static load. Few studies have been performed on the mechanical properties of carbonaceous mudstone coarse-grained soil embankment under the combined action of rainfall infiltration and dynamic load. E aim of this study is to study the influence of rainfall infiltration and vehicle load on the seepage field and dynamic characteristics of carbonaceous mudstone coarsegrained soil slope with different gradations using the GeoStudio and FLAC 3D software. Physical and Mechanical Parameters. e test data through the indoor geotechnical test of the soil sample prepared on the basis of the proposed gradation in the project are shown in Table 3. ese data provide accurate physical and mechanical parameters for the subsequent numerical simulation
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