SH固化剂复配无机材料加固黄土抗侵蚀试验研究

Anti-erodibility of Loess Subgrade Slope Reinforced with SH-Polymer and Inorganic Material

在强降雨作用下,黄土路基边坡坡面土体易发生侵蚀,对道路工程和行车安全造成危害。为分析不同固化材料对黄土边坡抗侵蚀性能的改良效果,利用人工降雨模拟试验,对高分子材料SH、水泥和石灰3种固化剂掺入后坡体的抗侵蚀能力进行对比研究,采用产流时间、总产沙量和总径流量等指标进行定量评价,并分析了不同固化剂对黄土边坡抗侵蚀性能的影响机理。试验结果表明:SH固化剂能够降低边坡的产沙速率和产沙量,其浓度为8%时提升效果最佳,继续增加浓度后提升效果不明显;石灰、水泥在降低产沙速率和减少产沙量方面优于SH,但会大幅度降低坡体的渗透性能,导致产流时间提前和坡面径流量增加;将3种固化剂复合掺入后可以弥补单一固化剂的缺点,全面有效地提高黄土边坡的抗侵蚀能力。

Loess subgrade slope is subjected to erosion under heavy rain,which is detrimental to highway maintenance and driving safety. The anti-erodibility of loess slope reinforced by SH-polymer,cement,and lime,respectively,are examined comparatively through artificial rainfall test. Indicators inclusive of runoff start time,total sediment yield,and total runoff volume are quantitatively evaluated,and the effect of different soil stabilizers on anti-erodibility is analyzed. Results reveal that a 8% concentration of SH-polymer could reduce sediment yield and sediment yield rate to the optimum; yet increasing the concentration over 8% makes no further obvious contribution. Cement and lime are superior than SH-polymer in reducing sediment yield rate and sediment yield volume,but would also reduce the permeability of slope remarkably,bring about runoff in advance and larger runoff volume. By combining the three stabilizers,the shortcomings of each single stabilizer can be compensated,and the anti-erodibility of loess subgrade slope can be improved comprehensively.