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针对在降雨条件下,裸露的黄土边坡土体极易发生侵蚀,造成严重的水土流失问题,提出采用新型SH固化剂、木质素磺酸钙与水泥生态复合改性加固黄土的治理方法。通过单掺试验,初步确定了三种固化材料对黄土固化效果的影响规律与掺量范围;通过正交试验,确定了适宜黄土边坡植被护坡的复合改性配方的最优配比为0.5%掺量木质素磺酸钙、4%掺量SH和2%掺量水泥,在该配方下固化土的7 d无侧限抗压强度达到了2.43 MPa,满足护坡强度的要求,且耐水性能明显提高;利用扫描电镜试验,对比分析了复合改性前、后固化土的微观形貌结构变化,结果表明水泥水化产物填充孔隙与胶结土颗粒,木质素磺酸钙与黏土颗粒发生离子交换作用,SH高分子链搭接土颗粒且分子链间相互交联,三者共同促进土颗粒形成团聚结构,从而提高了土体的强度和水稳定性。该研究可为生态护坡工程中土壤的加固提供参考。
Abstract：The soil of exposed loess slope is highly prone to erosion under rainfall condition,which causes serious soil erosion.This paper proposes a treatment method of composite modification loess with SH curing agent,calcium lignosulfonate and cement.Through the single doping tests,the paper initially defines the effect law and adding range of three curing materials on modification effect of loess.Then based on orthogonal test,the paper further determines the optimal compound modified formula of slope vegetation for loess slope,which includes:0.5% of calcium lignosulfonate,4% of SH curing agent and 2% of cement.The unconfined compressive strength of stabilized soil can reach 2.43 MPa meeting the requirements of slope protection strength and the water resistance of the stabilized soil improves significantly after curing 7 days using the optimal formula.Finally by using scanning electronic microscope,the paper analyzes the microstructure of the stabilized soil before and after composite modification.The test results show that cement hydration products filling pores and cementing soil particles,ion-exchange action between calcium lignosulfonate and clay particles,and polymer chain of SH curing agent lapping soil particles contribute to the formation of agglomerate structure of soil particles,which improves the strength and water stability of stabilized loess.This study can provide a reference for soil reinforcement in ecological slope protection projects.
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基本信息:
DOI：10.13578/j.cnki.issn.1671-1556.2019.03.007
中图分类号:TU444
引用信息:
[1]王芮芮,项伟,王菁莪,等.生态复合改性黄土抗水蚀与强度特性试验研究[J].安全与环境工程,2019,26(03):44-49+55.DOI:10.13578/j.cnki.issn.1671-1556.2019.03.007.
基金信息:
国家自然科学基金项目(41672297)
2019-05-30
2019-05-30