石灰、水泥对粉土的改良研究

Study of Modifying Silt by Lime and Cement

为进一步完善行业规范,促进施工工艺的标准化,降低高速公路建设成本,提高节能减排效益,文中针对京台高速公路北京段路基粉土保水性差、级配不良、塑性指数低、强度低的特点,用水泥、石灰进行改良,研究改良土的强度、压缩性和渗透性。由此得出如下结论：石灰、水泥改良土均得到较好的改良效果,水泥、石灰改良最佳配比在4%~6%范围;水泥对土体强度的提高明显优于石灰;二者对土样压缩性能的改善效果相差不大;石灰对土体渗透性的改善要优于水泥;对于强度较低的土样建议使用水泥来提高其强度特性,对于级配较差的土样建议采用石灰来提高其水稳性。

In order to further improve the industry standard, promote the standardization of construction technology, reduce the highway construction cost and improve the efficiency of the energy conservation and emissions reduction, in this paper, cement and lime were used to research the improvement to the embankment silt of Beijing Section of Beijing-Taibei Expressway that grading and water retention are poor, while strength and plasticity index are low. It can be concluded that., the improvement of soil with lime and cement are effectively, the best ratio of lime improvement is in the range of 4 % to 6% ; the improvement of soil strength improved by cement is superior to that improved by lime; while effectiveness of soil compression performance is similar, lime soil is better than cement improved soil when it comes to the permeability. It is suggested that cement improved soil is recommended to use to improve its strength properties for better strength, high graded and low intensity soil samples. And lime improved soil is suggested to improve water stability for poorly graded soil samples.