砾状煤系土改良性能的试验研究

针对广梧高速公路沿线的砾状煤系土不能满足路基填料要求的问题，采用室内试验的方法，对其提出了分别掺加生石灰和水泥两种改良方案并进行改良试验对比研究。研究结果表明：经水泥改良后的砾状煤系土的压实性能、承载比和水稳性等方面效果明显优于经石灰改良的；经水泥改良后的抗剪性能、无侧限抗压强度和抗变形能力均有较大程度的提高；在影响砾状煤系土强度的因素中，水泥掺入比的影响最显著，其次是龄期和含水率，并根据无侧限抗压强度试验结果提出了多因素影响拟合公式。砾状煤系土掺加约3%水泥改良后直接作为路基填料可满足要求，为煤系土地区路基处理提供借鉴依据。

Experimental study of improvement properties of rudaceous coal-bearing soil

In light of the problem that the rudaceous coal-bearing soil which ranges along with Guangzhou-Wuzhou Expressway can’t content for soil subgrade filler claim,two improvement schemes of the soil by respectively mixing quicklime and cement are put forward and improvement tests are accordingly taken for contrasting study according to the results of test in laboratory.The result indicated that the effect by mixing cement is evidently better than that by mixing quicklime of the rudaceous coal-bearing including consolidation properties,California bearing ratio(CBR),water stability,etc.;its shear strength properties,unconfined compressive strength and resistance deformability are all evidently increased by mixing cement;in factors effecting strength of the rudaceous coal-bearing soil,cement mixing ratio is the most salient,followed by age and water content,and a fitted formula which is affected by multi-factors is put forward according to the test result of unconfined compressive strength.The rudaceous coal-soil which is mixed with about 3 percent cement is entirely able to meet the claim for subgrade filler,which offers useful reference to roadbed treatment in coal-bearing soil region.