Dissertation > Transportation > Road transport > Road works > Road construction materials

Study on the Triaxial Compression Experiment of the Metamorphic Soft Rock Filler in Shi-Tian Expressway, Western Section of AnKang

Author LiuYingJie
Tutor WangXiaoMou
School Chang'an University
Course Geotechnical Engineering
Keywords Metamorphic Soft Rock Large triaxial test Stress-strain relations Particle breakage
CLC U414
Type Master's thesis
Year 2011
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Metamorphic soft rock Qinling Mountains highway construction process, and if the metamorphic soft rock abandoned, then not only will destroy the surrounding ecological environment, but will also increase the cost of road construction and road construction in reducing costs, contrary to the protection of the ecological as well as new ideas in harmony with the surrounding environment. Metamorphic soft rock mining, however, has a strong degree of weathering, low strength, the nature of the filler with water prone to the wetting deformation and strength disadvantage and low, limiting its application in the construction of the highway embankment, therefore, this paper Shiyan - Tianshui Expressway well-being of the western part of relying through the indoor electron microscopy grinding test, point load strength test, swelling test, disintegration test, as well as large-scale triaxial shear test of metamorphic soft rock packing stress-strain characteristics expand obtained the following research: metamorphic soft rock electron microscopy grinding test metamorphic soft rock composed of the mineral composition and its in naming; metamorphic soft rock load test measurement of rock samples compressive strength to determine the metamorphic rocks belonging to the metamorphic soft rock; derived by metamorphic soft rock expansion test small expansion of the metamorphic soft rock to draw of the deterioration soft rock; metamorphic soft rock disintegration test belongs to the Higher the durability of the rock. 2 large triaxial test indoor packing metamorphic soft rock, metamorphic soft rock filler in the mechanical properties of different density and water for the metamorphic soft rock strength parameters of the filler. The tests showed that: With the confining pressure increasing stress-strain relationship tends to soften, the softening depends mainly on the size of the confining pressure; confining pressure is low, the metamorphic soft rock filler appear first volume contraction during shearing, With the increasing axial strain, volume contraction gradually into the body swelling. Dilatancy deformation gradually becomes smaller with increasing confining pressure, while the transition to full body shrink, but the body shrinkage gradually become smaller and stabilize; shear properties of the water filler metamorphic soft rock, mainly reduce shear strength parameters. 3 derived by metamorphic soft rock fill large triaxial shear test particles before and after the screening test, the metamorphic soft rock filler in lower stress levels prone to higher particle breakage phenomenon due to particle breakage of material shear expansion and shear strength of the impact, therefore, the analysis of the metamorphic soft rock particle breakage under shear.

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