温度荷载下剑麻纤维-ECC地下侧墙抗裂性能

为研究地下侧墙采用优化后的剑麻纤维-ECC 作为浇筑材料的抗裂效果，利用经实际工程验证过准确性的普通地下侧墙ANSYS 有限元建模方法，分析在温度荷载作用下剑麻纤维-ECC 地下侧墙的温度场与应力场变化规律，并与建立的普通混凝土地下侧墙模型进行对比分析。 结果表明:与普通混凝土相比，剑麻纤维-ECC 地下侧墙温度峰值较普通混凝土地下侧墙的温度峰值高，且出现温度峰值的时间较普通混凝土侧墙滞后；将剑麻纤维-ECC 材料用于地下侧墙结构时，能够减小地下侧墙的开裂风险；在环境温度较低时，可通过降低入模温度的施工优化方法来减小地下侧墙的裂风险。

Anti-cracking performance of underground sidewall using sisal fiber-ECC under temperature load

The anti-cracking effect of underground sidewalls using optimized sisal fiber-ECC as the pouring material was investigated. Based on ANSYS, the finite element modeling of sisal fiber-ECC underground side wall was built using a modeling method that has been verified by actual engineering. The variation laws of the temperature field and stress field of the underground sidewall using sisal fiber-ECC under temperature load were analyzed, and they were compared with those of the model of ordinary concrete underground sidewalls. Results show that, compared with ordinary concrete underground sidewalls, the sisal fiber-ECC underground sidewall exhibits higher peak temperature, which shows up later than that of the ordinary concrete sidewall. When the sisal fiber-ECC material is used in the underground side wall structure, the risk of cracking of the underground side wall can be reduced. A method of lowering the pouring temperature can be adopted to reduce the risk of cracking of the underground side wall when the ambient temperature is low.