榆科分干渠混凝土衬砌的冻害分析

榆科分干渠是在原塑膜防渗基础上改用的混凝土衬砌。冻胀观测成果表明 ,原塑膜层阻隔渠道渗漏水的下渗 ,膜上基土含水量增大 ,致使衬砌块发生严重冻害 ,因此 ,应对原塑膜防渗层进行适当处理 ,消除其隔渗作用。对大型抛物线形渠道衬砌工程 ,必须做好防冻胀设计。

Analysis on Freezing Damage of Concrete of Yuke Sublateral Main Canal

The results of frost-heaving observation from Yuke sublateral main canal, lined with concrete on the base of original plastic membrane, demonstrate that the concrete Lining blocks of the canal are damaged seriously by freezing because seepage water is resisted by the original plastic membrane that should be treated to eliminate seepage risisting function. The design of frost-heaving protection must be made well for lining works of large parabolic canal.