石灰硅灰固化粉砂土的抗剪强度试验研究
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摘要
针对粉砂土在动载作用下易液化破坏的缺点,以宁夏银川西夏区市政道路路基用粉砂土为研究对象,分别采用3%,6%掺量的石灰和1%,3%,5%掺量的硅灰对粉砂土进行改良,进行了龄期为28,90 d的三轴试验研究。结果表明,石灰有效激发了硅灰的活性,石灰固化粉砂土的内摩擦角随着硅灰掺量的增加变化不显著;石灰固化粉砂土黏聚力随着硅灰掺量的增加变化非常显著,最高可以增加6.82倍。考虑工程的经济性,可以采用低掺量石灰和高掺量硅灰固化粉砂土,提高其力学性能。
In order to overcome the liquefiable destruction of silty soil under dynamic load, the silty soil is improved by adding lime(3%, 6%) and silica fume(1%, 3%, 5%) chosen Ningxia Yinchuan Xixia district as an experimental subject.The shear strengths of solidified soil at the age of 28 and 90 days are studied, using three axial shear strength tests. The results show that the activity of silica fume is effectively stimulated by the lime. The change of internal friction angle of lime solidified silty sand is not obvious with the addition of silica fume. The increase of cohesive strength of lime solidified silty sand is remarkable with the addition of silica fume content, and the maximum can be increased by 6.82 times. Low dosage lime and high content silica fume can be used in solidify silty sand to improve its mechanical properties, considering the economy project.
In order to overcome the liquefiable destruction of silty soil under dynamic load, the silty soil is improved by adding lime(3%, 6%) and silica fume(1%, 3%, 5%) chosen Ningxia Yinchuan Xixia district as an experimental subject.The shear strengths of solidified soil at the age of 28 and 90 days are studied, using three axial shear strength tests. The results show that the activity of silica fume is effectively stimulated by the lime. The change of internal friction angle of lime solidified silty sand is not obvious with the addition of silica fume. The increase of cohesive strength of lime solidified silty sand is remarkable with the addition of silica fume content, and the maximum can be increased by 6.82 times. Low dosage lime and high content silica fume can be used in solidify silty sand to improve its mechanical properties, considering the economy project.
引文
[1]张刚,李宏波.水泥硅灰粉砂土抗剪强度实验研究[J].宁夏大学学报:自然科学版,2014,35(4):339-342.
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[2]王勃,李宏波,田帅.纤维水泥粉砂土耐久性试验研究[J].铁道建筑,2011(9):92-94.
[3]朱辉,杜明芳,袁二键,等.水泥石灰改良土在粉砂土路基处理中的应用[J].建筑技术,2014,45(7):608-611.
[4]刘国柱,邢洁,王飞,等.固化剂粉煤灰稳定粉砂土应用研究[J].粉煤灰综合利用,2013(3):44-46.
[5]王彦勇,王小亚.水泥石灰稳定粉砂土路基的应用研究[J].北方交通,2016(8):55-58.
[6]袁二键.水泥石灰稳定处治粉砂土路基的应用技术研究[D].郑州:河南工业大学,2011.
[7]马超,常亚洲.浅谈水泥稳定粉砂土施工技术在公路施工中的应用[J].黑龙江科技信息,2012(13):268-268.
[8]李希明,叶为民,冯守中.Soilfix改良粉砂土路用性能试验研究[J].低温建筑技术,2012,34(12):99-101.
[9]张鹏,许庆虎.水泥石灰稳定粉砂土的实验研究[J].安徽建筑,2011,18(5):189-190.
[10]曹兴国,刘文荣,解建光,等.改性淤泥质粉砂土用于路基填筑的试验[J].江苏航空,2009(S1):112-114.