U型混凝土渠道冻胀试验监测与抗冻拔力验证研究

Study on U-type Concrete Channel Frost Heaving Test Monitoring and Its Freezing Resistance Verification

为研究我国北方地区U型混凝土渠道是否满足要求,选址在内蒙古河套灌区进行试验,在U型断面上设置7个不同观测点,分别位于渠道阴坡、底部和阳坡,分别监测冻土深度、冻胀量和冻胀力3项指标,并通过公式验证了该断面的抗冻拔力是否满足要求,结果表明:渠道冻土深度随时间呈先增加后降低的二次抛物线趋势,且在1月20日附近达到最大值;冻土深度、冻胀量和冻胀力3项指标均表现为渠底>阴坡>阳坡;通过对渠道的抗冻拔力计算,结果表明,该断面形式可满足当地抗冻拔要求。

In order to study whether the U-shaped concrete channels in northern China meet the requirements, the site selection of Hetao Irrigation District in Inner Mongolia was conducted. Seven different observation points were set on the U-shaped sections, respectively on the shady, bottom and sunny slopes of the channels., The amount of frost heaving and the frost heaving force. The results show that the depth of permafrost ehannd first increases and then decreases with the passage of time. Reaching the maximum near January 20; the three indicators of frozen soil depth, amount of frost heaving and frost heaving showed bottom of channel〉 shady slope〉 sunny slope; through the calculation of anti-freezing force of channel, the results showed that the section form can meet the local anti-freeze pull requirements.