文档介绍：第 14 卷 第 3 期 南 水 北 调 与 水 利 科 技 V N o. 3
20a;
2. Gansu P rov ince H ighw ay Construction M anagement Group Co . L td. , L anz hou 730030, China;
3. Schoo l of Civil E ngineering and A rchitecture , H enan University , K aif eng 475004, Chi na)
Abstract: T he microstructure and mineral compositio n of the ex pansiv e soil alo ng Shiy an to T ianshui ex pressway in L ongnan
District were analyzed thoug h scanning elect ron micro sco pe ( SEM ) experiments and X2ra y diff ractio n( XRD ) experiments, and
the ex pansio n pro perties of ex pansiv e so il in this district w ere analyzed. A cco rding to the ex periment result s, the ex pansiv e soil
particles basically presented as lam inas w ith or witho ut bending , w hich show ed the properties of montmo rillo nite mineral part i2
cles o r mix ed2 layer mineral particles o f montmorillonite and illite; L amellifo rm mineral particles were contact ed surface to sur2
face, and there w ere small ga ps amo ng the mineral particles; T he mineral composition o f this expansive so il was analyzed qualita2
tively and quantitativ ely , w hich show ed small pro perty of montmorillonit e and large pro pert y of illite, kaolinite and quartz. Based
on the ex periment results above, the ex pansive soil along Shiyan to T ianshui ex pr