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。
Abstract
Loess subgrade slope is subjected to erosion under heavy rain,which is detrimental to highway mainte-nance 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.
关键词
路基边坡 /
黄土 /
土壤侵蚀 /
SH固化剂 /
复合材料 /
人工降雨试验 /
抗侵蚀试验
Key words
subgrade slope /
loess /
soil erosion /
SH-Polymer /
composite material /
artificial rainfall test /
anti-erodibility test
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参考文献
[1] LENTZ R D, SOJKA R E, CATER D L, et al. Preventing Irrigation Furrow Erosion with Small Applications of Polymers[J]. Soil Science Society of America Journal, 1992, 56(6): 1926-1932.
[2] MILLER G A, ZAMAN M. Field and Laboratory Evaluation of Cement Kiln Dust as a Soil Stabilizer[J]. Transportation Research Record, 2000, 1714(1): 25-32.
[3] 王菁莪.高分子固化剂治理黄土水蚀破坏试验研究[D].武汉:中国地质大学, 2009.
[4] 程佳明.新型固化剂加固黄土边坡技术试验研究[D]. 太原:太原理工大学, 2014.
[5] 张 姝.复合改性黄土力学特性试验研究[D].武汉:中国地质大学, 2015.
[6] 单志杰.EN_1离子固化剂加固黄土边坡机理研究[D].北京:中国科学院, 2010.
[7] 汪益敏.路基边坡坡面冲刷特性与加固材料性能研究[D].广州:华南理工大学, 2003.
[8] 赵春红.坡面侵蚀性降雨径流水动力学特性及其对输沙的影响[D].杨凌:西北农林科技大学, 2014.
[9] 武彩萍.人工降雨条件下黄土边坡的室内模型试验研究[D].杨凌:西北农林科技大学, 2013.
[10]蒋顺清,陈 雯.用水泥土浆材作防渗材料的试验研究[J].长江科学院院报, 1995, 12(2): 55-68.
[11]胡汉兵,胡胜刚,刘 芳.粉细砂水泥土力学与渗透特性试验研究[J].长江科学院院报,2013,30(10):48-53.
[12]周建基,梁收运,张帆宇,等.石灰改良黄土的工程特性试验研究[J].铁道建筑, 2014, (9): 105-108.
[13]马学宁,梁 波.水泥改良黄土力学特性试验研究[J].岩土工程技术, 2005, 19(5):241-244.
[14]赵红华,龚壁卫,赵春吉,等.石灰加固膨胀土机理研究综述和展望[J].长江科学院院报, 2015, 32(4): 65-70.
[15]王银梅,杨重存,谌文武,等.新型高分子材料SH加固黄土强度及机理探讨[J].岩石力学与工程学报, 2005, 24(14): 2554-2559.
基金
国家自然科学基金项目(41672297,41572286)
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