Experimental Study on the Effect of Thermal Reinforcement on the Engineering Properties of Compacted Loess
In order to specific process of changing the physical,chemical and structural characteristics of soil by thermal reinforcement,and then affecting the engineering properties such as strength and water stability was clarified.The influence laws and action mechanisms of high temperature from 100℃ to 900℃ on the unconfined compressive strength and water-stability of compacted Yangling loess were discussed by four tests that are unconfined compressive strength,X-ray diffraction,mercury intrusion porosimetry and scanning electron microscopy.The results show that the unconfined compressive strength of samples treated after 900 ℃ was 1.15～5.26 MPa higher than that after 100 ℃;The samples had great water-stability when treatment temperature was not less than 500 ℃;The mineral contents of illite,montmorillonite,calcite and quartz changed under 500～900 ℃;The quantity of micro-pores (0.01 μm<d<0.1 μm),super micro-pores (d<0.01 μm) and pore fractal dimension of samples obviously decreased under 700～900 ℃;There are some high-temperature melting phenomena that promote the formation of some "dense structures" in soil particles;The soil particles are subjected to movement and rearrangement and forms some new compounds under the action of high temperature,which improves the compressive strength and water stability of samples.The research results can provide data and mechanism support for the application of thermal reinforcement method.
NETL
NSTL
万方数据
