海洋环境下玄武岩纤维加筋砂土抗液化性能的试验研究  

Experimental Study on Liquefaction Resistance of Basalt Fiber Reinforced Sand in Marine Environment

作　　者：杨易 许成顺[1] 杨钰荣[1] 岳冲 YANG Yi;XU Chengshun;YANG Yurong;YUE Chong(Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Department of Urban Construction,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京工业大学城市建设学部,北京100124

出　　处：《海洋技术学报》2022年第6期110-118,共9页Journal of Ocean Technology

基　　金：国家自然科学基金资助项目(51722801)。

摘　　要：历史资料表明,海域砂土液化引起的场地失效是造成震害的重要原因之一。本文围绕海洋腐蚀环境下的砂土抗液化性能的提升需求,通过室内试验探讨了玄武岩纤维加筋砂土在海洋环境下的抗液化特征:研究了纤维含量对波浪荷载作用下饱和砂土抗液化强度、超静孔隙水压力,以及应力—应变发展特征的影响。试验结果表明:纤维的掺入能够有效提高砂土在海洋环境下的抗液化强度,但存在纤维含量的阈值,纤维加筋增强法不会改变砂土的液化模式,在波浪低频荷载作用下,砂土呈现出了明显的剪胀特征,纤维含量对临界状态应力比具有显著影响,对相转换状态应力比影响较小,研究成果为海洋工程中纤维加筋土的推广应用提供了有价值的参考。Historical data show that site failure caused by liquefaction of sand in the sea area is one of the important causes of earthquake damage.In this paper,the liquefaction resistance characteristics of basalt fiber reinforced sand in marine environment are discussed through indoor experiments,focusing on the demand for improving the liquefaction resistance of sand in marine corrosion environment:the influence of fiber content on the liquefaction strength,superstatic pore water pressure,and stress-strain development characteristics of saturated sand under wave load is studied.The test results show that the incorporation of fiber can effectively improve the liquefaction resistance of sand in marine environment,but there is a threshold of fiber content,fiber reinforcement method will not change the liquefaction mode of sand,under the action of wave low-frequency load,the sand shows obvious shear expansion characteristics,fiber content has a significant influence on the critical state stress ratio,and has little effect on the phase transition state stress ratio,and the research results provide a valuable reference for the promotion and application of fiber reinforced soil in marine engineering.

关 键 词：海洋工程 饱和砂土液化 玄武岩纤维加筋土 超静孔隙水压力 动强度曲线 

分 类 号：TU34[建筑科学—结构工程]