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北方地区存在冻融和干湿循环对土的破坏问题,为此完成了冻融和干湿循环条件下的SH固土剂联合石灰固化土、石灰固化土的抗压试验和两种固化土路用性能的现场试验。试验表明:土的抗压强度随固土剂掺量的增大而增大;随冻融次数和干湿循环次数的增加而减小;冻融6~8次或干湿循环4~7次时,强度降幅稳定;随固土剂掺量的增大,现场加州承载比和回弹模量增大,回弹弯沉量减小。电镜扫描显示:固土剂干燥后形成的胶膜包裹土颗粒,并形成弹性立体丝网;使得土的憎水性和胶结能力增强,同时约束了土的变形。这种固化方法可满足高地下水位和寒冷地区高等级路堤填筑的要求。
In northern China, there are problems of soil thawing under freeze-thaw cycles and wet-dry cycles. Therefore, the SH tests of freeze-thaw and wet-dry cycle combined with lime-stabilized soil, lime-cured soil and compression tests of two hardened soil Performance of the field test. The results show that the compressive strength of soil increases with the increase of dosage of soil-fixing agent, decreases with the number of freeze-thaw cycles and the number of wet-dry cycles; freeze-thaw cycles of 6 to 8 times or dry-wet cycles of 4 to 7 times , The decrease of strength was stable. With the increase of the dosage of the earth-fixing agent, the bearing ratio and the rebound modulus of California increased and the amount of rebound deflection decreased. Electron microscopy scanning showed that the film formed by the solidified agent after drying formed parcels of soil particles and formed elastic three-dimensional mesh, which enhanced the hydrophobicity and cementation ability of the soil and restrained the deformation of the soil. This curing method can meet the high groundwater level and cold embankment filling requirements.