干湿循环对建筑废弃物改良膨胀土的力学性能试验研究

田 富新¹, 何 韬²
1、广州市第二市政工程有限公司
2、长沙理工大学交通运输工程学院;长沙理工大学公路养护技术国家工程研究中心

摘要

针对干湿循环作用下膨胀土路基稳定及耐久性服役问题,提出在膨胀土中掺入建筑废弃物进行物理改良,并通过系列室内性能试验确定建筑废弃物对膨胀土工程性能与膨胀性能的影响规律｡然后,通过回弹模量试验､破坏强度试验､永久变形试验定性､定量分析干湿循环次数和建筑废弃物掺入率对混合土样力学性能的耦合影响｡结果表明:建筑废弃物对膨胀土工程性能和膨胀性能存在可行改良性和有效抑制性;回弹模量､破坏强度同干湿循环次数成负相关关系,永久变形终值同干湿循环次数成正相关关系;随着建筑废弃物掺入率的提高,回弹模量､破坏强度呈先增大后减小趋势,永久变形终值呈先减小后增大趋势｡基于试验结果建立永久变形预估模型,以期为改良建筑废弃物-膨胀土在路基建设中的实际应用提供有益参考｡

关键词

路基;改良建筑废弃物-膨胀土;干湿循环;力学性能;预估模型

参考

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