Comprehensive treatment method for low-liquid-limit silt roadbed

Abstract

The invention discloses a comprehensive treatment method for a low-liquid-limit silt roadbed. The comprehensive treatment method is specifically implemented according to the following steps that 1, a pebble bed is replaced and filled; 2, a geotextile impermeable layer is arranged on the pebble bed in the step 1; 3, a silty soil embankment is arranged on the geotechnical cloth impermeable layer in the step 2, a pebble slope toe and a cement soil layer are arranged at the slope toe of the silty soil embankment, and the silty soil embankment is wrapped by geotechnical cloth; 4, a cement soil area is arranged on the silty soil embankment in the step 3; and step 5, arranging a road surface and a road shoulder on the cement soil area in the step 4. According to the comprehensive treatment method for the low-liquid-limit silt roadbed, the problem of treatment of the liquid-limit silt roadbed is solved.

Description

technical field [0001] The invention belongs to the technical field of roadbed construction, and in particular relates to a comprehensive treatment method for silt roadbed with low liquid limit. Background technique [0002] Silt is a kind of soil with more than half of the total mass and the particle size is not more than 0.075mm, and the plasticity index of silt is not more than 10. Generally speaking, dense silt can be used as a good material for foundations, but low liquid limit silt has low liquid limit and plastic index, and poor mechanical properties and water stability, so saturated low liquid limit silt is not suitable for earthquakes. It is easy to be liquefied by vibration, and the pore water pressure in the soil suddenly rises, so that the inter-particle stress of the soil is reduced to zero, and the shear strength is reduced, thereby losing the bearing capacity of the foundation and endangering the ground buildings. When planning the route design, try to ensure...

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Problems solved by technology

In order to strengthen the subgrade, mechanical methods such as rolling or dynamic compaction can be used to reduce the porosity of the soil and increase the compactness. However, the compaction of low liquid limit silt is difficult and it is easy to seep water when it encounters rainfall, so the effect of a single mechanical treatment is not ideal.

Or replace the subgrade material with rocky soil and sandy soil with better engineering properties through replacement. As far as excavation and replacement are concerned, on the one hand, it will take time and money to transport the replacement materials, and on the other hand, the disposal of the discarded party also occupy land resources

The foundation treatment of low liquid limit silt is a major problem in road construction at present. Due to the poor performance of low liquid limit silt, it cannot be used in high-standard roadbed construction, which restricts the use of low liquid limit silt in roadbed construction. application, which virtually increases the construction cost and affects the progress of the construction

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