花岗岩全风化层及其改良土的试验研究

Experimental Study of the Granitic Regolith and Improved Soil

研究目的:高速客运专线对路基变形要求非常严格。虽然针对全风化花岗岩及其改良土的公路路用性能目前研究较多,但能否用于高速铁路基床底层或路基本体填料的研究国内外尚不多见。基于此,本文通过大量的土工试验和理论分析,研究了花岗岩全风化层及其改良土的强度机理、压缩特性、水稳定性以及干湿循环强度衰减特性等。研究结论:通过对花岗岩全风化层及其改良土的试验研究,得出:(1)对于水泥改良土,其塑性指数随水泥剂量增加而降低;(2)随水泥量的掺加,最优含水量变化不大,花岗岩全风化层化学改良土的力学指标均有所增大;(3)经过改良之后的花岗岩全风化层能用于高速铁路基床底层或路基本体填料,这为高速客运专线花岗岩全风化层路基填料的选择和应用提供了理论依据,具有重要的理论价值和工程实用意义。

Research purposes： High speed passenger dedicated lines have strict requirements to roadbed deformation. Although fully weathered granite and its improved soil has been widely used in highway projects, however, it is still rare that the fully weathered granite and its improved soil used for high - speed railway at home and abroad. Therefore, the strength mechanism, compression feature, the water stability and the attenuation of shear strength of the granitic regofith and its improved soil are studied in this paper. Research conclusions：From the experimental study of the granitic regolith and its improved soil , it is concluded that the plastic index decreases with the increasing of the cement; the optimum water content shows little change, however, mechanical properties of granitic regolith are increased with the increasing of the cement. The fully weathered granite and its improved soil can be used for high - speed railway, which provides a reference to the similar engineering, and there is an important theoretical value and engineering practical significance.