Abstract:In the process of the roadbed construction of highway engineering in humid and rainy regions in the south of China

the high limit liquid soil is very widely used.The mechanical properties of high liquid limit soil directly affect the long-term stability of the roadbed.Because of the heavy rainfall

it is very difficult to fill the roadbed fill in the actual project

which affects the safety and stability of the roadbed.Therefore

in order to ensure the safety of the roadbed

it is significant to study physical properties of high liquid limit clay and engineering characteristics deeply

especially on the high liquid limit the safety and stability of roadbed.Moreover

there are few studies on the water stability

shear strength index and the change rule of the high liquid limit soil

so it is useful to study the influence factors of the strength of roadbed stability and slope stability In order to study the physical and mechanical properties of the high liquid limit soil of a highway roadbed

the change in mechanical properties of the high liquid limit soil with compaction degree and water content was analyzed by confined compression

rebound

triaxial shear strength tests of soils from two cross sections of the roadbed of a highway

The test results showed that the roadbed soil is moderate compressibility.For the same water content

cohesionc and internal friction angle φ

compression modulusEs

compression indexCcincrease with the increase of compaction degree

and rebound index Csincreases slightly with the increase of compaction degree.For the same compaction degree

the soil samples that their water content are greater than the optimum water content are tested.The compression modulus Es

compression indexCcand rebound index Csncrease with the increase of water content

cohesion c decrease with the increase of water content

the internal friction angle φhardly changes when the water content increases.