Experimental Study on the Physical and Mechanical Properties of Loess Reinforced by Consolid System
Research purposes:The use of modified materials(curing agent)is a common method of loess foundation reinforcement treatment,but there are certain problems with traditional modified materials,such as the lime-modified soil with relatively low strength and poor water resistance,cement-modified loess with large shrinkage,easy to crack,and certain impact on the environment.Therefore,it is important to seek environmentally friendly and high performance soil curing agents to solve the shortcomings of traditional modification materials to modify loess.This paper conducted an experimental study on the modification of loess by consoled system,and conducted a comparative analysis with cement and lime modified loess.The effects of curing agent dosing and curing age on the strength,water stability and microstructure of the loess were investigated by unconfined compressive strength,disintegration and SEM tests.Research conclusions:(1)The strength of the loess modified by consolid system increases with the increase of curing agent dosing and curing age.When the curing age is 28 d,the strength of the modified loess increases from 55 kPa to 95 kPa with the increase of curing agent dosing(1％～5％).The strength of the 5％modified loess is between cement-modified loess(370 kPa)and lime-modified loess(71 kPa).(2)The water stability coefficient and disintegration resistance of the modified loess increase with increasing amount of curing agent.With increasing amount of curing agent(1％～5％),the water stability coefficient of the modified loess increases from 0.13 to 0.36.The water stability of the 5％modified loess is between that of lime-modified loess(0)and cement-modified loess(0.75).(3)The consolid system significantly improves the water repellency of the soil.(4)With the increase of consolid system(1％～5％),the permeability coefficient of modified loess decreased from 0.63 × 10-6 cm/s to 0.36 × 10-6 cm/s.The permeability of 5％modified loess was between that of lime-modified loess(0.88 × 10-6 cm/s)and cement-modified loess(0.32 × 10-6cm/s).(5)SEM images show that with the increase of curing agent dosing,the large pores inside the soil are significantly reduced,and the connection between soil particles is tighter and more uniformly distributed.(6)The research results can provide a reference for foundation reinforcement treatment in loess areas.
loess modified by consolid systemunconfined compressive strengthwater stabilitymicro mechanism
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