论文部分内容阅读
抗疏力土壤固化剂是一种化学加固材料,在国际上得到了广泛的运用,改良效果明显,但在我国黄土地区运用较少。利用抗疏力土壤固化剂对甘肃庆阳地区以及甘肃兰州地区的黄土进行化学改性试验,探讨抗疏力固化剂在我国黄土地区运用的可行性。对不同配比的抗疏力固化黄土进行界限含水率试验、击实试验、单轴抗压试验、膨胀试验以及干缩试验。试验结果表明,添加抗疏力固化剂之后改性黄土的液限、塑限及塑性指数增大;最大干密度减小,最优含水率增大,抗压强度增大,线性干缩率先减小后增大,线性膨胀率减小。通过和黄土5%水泥改性土、5%石灰改性土比较可知,抗疏力固化剂的最佳配比在2.0%~2.5%范围。掺量为2.5%的抗疏力固化黄土的改良效果介于水泥改性土和石灰改性土之间,在甘肃黄土地区具有一定的使用价值。
Anti-sparse soil curing agent is a chemical strengthening material, has been widely used in the international community, the improvement effect is obvious, but less used in the loess area in China. The chemical modification of loess in Qingyang region of Gansu and Lanzhou region of Gansu province was carried out by using the anti-loophole soil curing agent to explore the feasibility of using the anti-sparing agent hardener in the loess region of China. The tests of confining moisture content, compaction test, uniaxial compression test, expansion test and shrinkage test were conducted on the different proportion of sparsely-solidified loess. The results show that the liquid limit, plastic limit and plasticity index of modified loess increase with the addition of the anti-sclerotic curing agent; the maximum dry density decreases, the optimum moisture content increases, the compressive strength increases, the linear shrinkage decreases first After the small increase, the linear expansion rate decreases. Through the comparison of 5% cement-modified soil and 5% lime-modified soil with loess, the best proportion of anti-sparing agent is 2.0% -2.5%. The improvement effect of the content of 2.5% anti-sparse solidified loess is between cement-modified soil and lime-modified soil, and has certain value in loess area of Gansu Province.