噴射注入工法による地中管路の地震時液状化対策に関する研究

Abstract

Damages of buried pipelines in liquefied grounds are caused by uplift andsinking of grounds as well as lateral flow. Hear, CCP (Cement Churning Pile)method is proposed as countermeasures to these damages. Buried pipelines can befixed in any arbitrary shape to adopt the features of CCP method. On the otherhand, the method has the possibility that dynamic strains due to wave propagationwill become larger than the case with no-countermeasures. So experiments andtheoretical analyses were performed. Experimental and theoretical results aresummarized as follows:1. Experimental results: Uplift static strain of pipes with the countermeasureswas shown to be 50% smaller than that of no-countermeasures and dynamic strainwas only 1/3-1/9 as large as uplift static strain.2. Theoretical results: Beam theory was used in the response analysis ofexperimental model. Analytical results showed that dynamic strain is much smallercompared with static strain.