川西粉质黏土-衬砌接触面冻结强度规律研究

为揭示川西灌渠粉质黏土-衬砌接触面间冻结强度规律,针对川西地区灌渠渠基土开展了冻结作用下冻结温度、冻结时间、初始含水率、法向荷载4种影响因素在不同条件下的剪切试验。结果表明:接触面间峰值抗剪强度与冻结温度、初始含水率变化呈负相关,与冻结时间、法向荷载变化呈正相关。此外,利用正交分析,揭示了4种因素对峰值抗剪强度影响的显著性,结果显示:法向荷载对峰值抗剪强度影响最显著,初始含水率、冻结温度次之,冻结时间影响不显著。试验成果可为川西灌渠冻胀稳定性及相关工程研究提供依据。

Study on the freezing strength of silty clay-lining interface in western Sichuan

In order to reveal the law of freezing strength between silty clay and lining interface of irrigation canal in western Sichuan,shear tests were carried out on the foundation soil of irrigation canal in western Sichuan under different conditions,including freezing temperature,freezing time,initial moisture content and normal load.The results show that the peak shear strength between contact surfaces is negatively correlated with freezing temperature and initial moisture content,and positively correlated with freezing time and normal load.In addition,an orthogonal analysis was used to reveal the significant influence of the four factors on the peak shear strength.The results showed that the normal load had the most significant influence on the peak shear strength,followed by the initial moisture content and freezing temperature,and the freezing time had no significant influence.The experimental results can provide a basis for the study of frost heave stability and related engineering of irrigation channels in western Sichuan.