关键词: 塔克拉玛干沙漠, 风沙土, 腐蚀性, 沙危害, 不均匀沉降

Abstract: Aeolian sandy soil is a kind of specific soil formed in arid or semiarid area.It has specific engineering property.The engineering construction of desert area would suffer more severe environment because of the specific of environment in desert area and engineering properties of aeolian sandy soil.These specific properties could cause adverse engineering geologic problems such as salt corrosion,wind-sand erosion and deposition,unequal settlement of foundation soil.Aeolian sandy soil has high salt content,the eutectic salt content is 0.06%.The total mineralization of groundwater of Tazhong is 4~7 g·L^-1.Both the soil and ground water contain high SO₄^2-of concentration and have crystallization corrosive effect on concrete;they also contain high Cl^- concentration and have corrosive effect on steel.The main protective measures are using anti-sulfate cement and protective oil and film.The wind-sand drift mainly produce erosion and deposition to construction.The erosion could destroy the foundation of construction and debase the strength of the foundation and would made the foundation unequally settle and tilt.The main protective measure is engineering sand control system,straw checkerboard has good protection efficacy to sand erosion and deposition.The road foundation would unequally settle when bearing unequal loading and soil properties change(on spatially and temporally).The aeolian sandy soil is a very loose soil and has no cohension,it's unitary properties very low.The vehicles which rush through would give the base load and unload and produce vibration on the base,the elasticity wave which produced by vibration could transmit far distance and bring deep soil unequal settlement.The unequal settlement must be protected from the origin such as avoiding complex landform,foundation compacted by heavy road-roller,using geotextile.

Key words: Taklimakan Desert, aeolian sandy soil, corrosive property, hazard of sand, unequal settlement