辽西地区粗颗粒泥质砂岩水泥改良试验研究

An Experimental Study on the Improvement of Argillaceous Sandstone Cement in Western Liaoning

为探索辽西地区具有强膨胀性的粗颗粒泥质砂岩作为高速铁路路基填料的适用性,在常规试验方法受到局限的情况下,通过改进试验仪器,克服了粒径对试验方法的限制,对水泥改良后的粗颗粒泥质砂岩进行了无荷膨胀率试验、膨胀性试验、加州承载比(CBR)试验。结果表明:水泥的掺入对粗颗粒泥质砂岩的膨胀性有明显的抑制作用,且最佳水泥添加质量分数为6%,此时,路基填料的CBR值从原土样的2.6提高到11.2,改良后土样的强度约提高了331%。

This paper is to explore the applicability of coarse-grained argillaceous sandstone with strong expansibility as subgrade filler for high-speed railway in Western Liaoning Province. Under the condition that the conventional test method is limited, the limitation of the test method can be overcome by improving the test instrument, with the no-load expansion rate test, expansion test and California bearing ratio(CBR) test to be carried out for the coarse-grained argillaceous sandstone after the cement improvement. The results show that the addition of cement helps to obviously inhibit the expansion of coarse-grained argillaceous sandstone, with the optimal mass fraction of cement being 6%. Meanwhile, the CBR value of the subgrade filler increases from 2.6 of the original soil to 11.2 after improvement, with the strength increasing by about 331%.