Abstract
The factors affecting the shear strength of sulfated saline soil are complex, and the variation law is difficult to explore. In order to determine the variation of shear strength of sulfate-based roadbed saline soil under different water content, compaction and confining pressure, the internal friction angle and cohesion, which are two important parameters of shear strength, were analyzed. The test results show that the stress-strain curve of sulfate-based saline soil is strain-softening type distribution, and the smaller the confining pressure, the more obvious the softening type; the shear strength increases with the increase in confining pressure and compaction. The cohesive force first increases and then decreases with the increase in water content, and the maximum cohesive force occurs near the optimal water content; the cohesive force increases slowly with the increase in compaction degree; the cohesive force increases most obviously when the water content is 10.8%. The internal friction angle decreases with the increase in water content, and the peak area is not obvious; the internal friction angle increases as the degree of compaction increases
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