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Experimental Study on the Properties and Mechanism of Solidified Saline Soil in Inshore with SH Agent and Lime for Construction of Road Embankment

Author: LiFang
Tutor: ChaiShouXi
School: Tianjin Institute of Urban Construction
Course: Geotechnical Engineering
Keywords: Coastal Saline Soil SH solid soil agent Lime solidified soil Road performance Mechanism of solid earth
CLC: U414
Type: Master's thesis
Year: 2007
Downloads: 267
Quote: 3
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Abstract


Coastal saline soil is widely distributed in the west coast of the Bohai Bay, construction projects need to be modified curing previously. Highway embankment, easy using lime cured saline soil moisture to soften and lose some of the intensity. Preliminary indoor research confirmed that the lime stabilized coastal saline soil added with certain SH solid soil agent can effectively improve the strength of solidified soil, water stability improved significantly stabilized soil. Field compaction tests completed in Hebei Province, the coastal highway typical sections (3.87%) of the soluble salt content, focusing on the suitability of the preliminary laboratory test results of the on-site construction; accordance with the rolling test the same curing materials and mixture ratio, over the same period has conducted laboratory experiments to explore the microscopic mechanism of SH solid earth agent; analysis of SH solid soil agent lime solidified saline soils in the curing effect of influencing factors. The main content and the results are as follows: (1) Select Fengnan County, Hebei Province, Hebei Province, the coastal highway T6 bid as a test sections, lime solidified saline soil, SH solid earth agent lime solidified saline soil for embankment filling Field Compaction Test. In the compacted embankment conservation to 1, 2, 3, 4-week-old, on-site sampling a large test block compressive strength test, direct shear fast shear test, compression and penetration tests. The results show that the incorporation of the agent SH solid soil improvement lime stabilized soil water stability, improve the of solidified soil strength and ability to resist compressive deformation. (2) Conservation of 6-week-old RCC test sections, the field testing of the compacted soil compaction, bearing ratio, resilient modulus and rebound deflection value indicators. Performance indicators have improved to varying degrees, the results confirm the SH solid soil agent lime solidified saline soil solidified saline soil than lime, and meet all regulatory requirements. Field compaction test to verify the suitability of the early indoor research in the on-site construction, SH solid soil agent can be applied to the west coast of the Bohai Bay coastal saline soil modified curing. (3) in accordance with the same rolling test curing materials and mixture ratio, indoors lime solidified saline soils and soil agent of SH solid lime stabilized coastal saline soil indoor bearing ratio of unconfined compressive strength test Law splitting tensile strength test, triaxial UU tests, compression and penetration tests. Test reveals agent SH solid soil mixed with lime stabilized soil can increase strength, reduce the stabilized soil infiltration capacity and deformation capacity. This results coincide with Field Compaction Test. (4) to study the microscopic mechanism of SH solid earth agent, taken through a scanning electron microscope lime solidified saline soil and SH solid soil agent lime solidified saline soil microstructure morphology and utilize the Leica QWin5000 graphics processing software of the SEM image for processing. The results showed that the SH solid soil agent parcels soil particles and pores between soil particles and the formation of the three-dimensional shape mesh-like coupling structure, improve the strength of the soil and enhance the soil's water-blocking performance. (5) combined with the early laboratory tests, Field compaction tests and laboratory test of the same period, the SH solid earth agent lime solidified saline soils curing effect factors.

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