室内加速水环境温度PVC-P土工膜老化试验性研究 English Version
Experimental study on the accelerated aging of PVC-P geomembrane under controlled indoor water ambient temperature
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摘要: 增塑聚氯乙烯土工膜（PVC-P）作为主体防渗材料应用于面膜堆石坝和抽水蓄能电站库底防渗结构，针对运行期PVC-P土工膜水环境下耐久性是否满足工程服役周期要求问题，本文选用国内三种PVC-P土工膜展开室内加速水环境老化和轴向拉伸力学性能试验，探究了PVC-P土工膜断裂应变的衰减规律；运用阿伦尼乌斯公式构建了PVC-P土工膜水环境老化模型，分析并预测了试验用土工膜使用寿命，利用20℃试验温度自然老化最长时间180d试验数据验证了模型的准确性。研究表明PVC-P土工膜寿命周期与库水温度、增塑剂的含量以及材料厚度有关，20℃温度下材料A服役周期49.05年，材料B与材料C分别为153.76年和181.30年。Abstract: The plasticized polyvinyl chloride (PVC-P) geomembrane as the primary impermeable material is applied in membrane faced rockfill dams and pumped storage power stations. Whether its service life under hydrolysis meets the durability during the operation period, we conducted the accelerated aging test under hydrolysis and axial tensile mechanical properties test to investigate the attenuation of breaking strain using three PVC-P geomembranes. The hydrolysis aging model was constructed by Arrhenius formula, and the service life of geomembrane was analyzed and predicted. The accuracy of the model was verified using test data collected over 180 days at a temperature of 20℃. The research shows that the life cycle of PVC-P geomembrane is related to the temperature of reservoir water, the content of plasticizer and the thickness of membrane material. At 20 °C, the service cycle of material A is 49.05 years, material B and material C are 153.76 years and 181.30 years respectively.
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Keywords:
- PVC-P geomembrane /
- Aging test under hydrolysis /
- Arrhenius formula /
- Aging model /
- Service life
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