侵蚀影响下水泥土的力学性质试验研究

发布时间：2018-05-05 03:25

  本文选题：水泥土 + 侵蚀　； 参考：《岩土力学》2014年12期

【摘要】：港珠澳大桥拱北隧道地处沿海地区,其地下水与海水相连,隧道基底采用粉体喷射搅拌法和高压喷射注浆法等方法进行加固,加固产生的水泥土在海水侵蚀性离子作用下其强度和稳定性会发生变化,从而对工程安全产生影响。根据上述两种施工工艺,制作内部含侵蚀物质和不含侵蚀物质的两种水泥土试块,配制多种不同浓度的单组分的化学溶液来模拟海水侵蚀环境,将制备的水泥土试块置于侵蚀溶液中进行预定时间的短时(≤28 d)浸泡,通过无侧限抗压试验、电镜扫描以及离子色谱测定,分别得到了单组分侵蚀溶液短时浸泡下水泥土试块无侧限抗压强度、微观结构随侵蚀溶液浓度和侵蚀时间的变化规律,以及侵蚀环境中离子浓度随侵蚀时间的变化规律。基于海水化学成分,配制多种不同浓度的双组分的化学溶液来模拟海水侵蚀环境,将制备的内部含侵蚀物质的淤泥质土水泥土试块置于侵蚀溶液中进行预定时间的长时(≥90 d)浸泡,通过无侧限抗压试验得到了双组分侵蚀溶液长时浸泡下水泥土试块无侧限抗压强度变化规律。试验结果可为临时性及长期性水泥土工程的设计及安全维护提供一定参考依据。
[Abstract]:The Gongbei Tunnel of Hongkong-Zhuhai-Macao Bridge is located in the coastal area, and its groundwater is connected with seawater. The foundation of the tunnel is strengthened by powder jet mixing method and high-pressure jet grouting method. The strength and stability of cement-soil under the action of seawater corrosive ions will change, which will affect the engineering safety. According to the above two construction techniques, two kinds of cement soil test blocks containing and without erosive substances are made, and a variety of chemical solutions of one component with different concentrations are prepared to simulate the environment of seawater erosion. The cement-soil samples were immersed in erosion solution for a short time (鈮，

本文编号：1845985