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Improved Isotropically Consolidated Undrained Triaxial Test Method for Non-Self-Supporting Materials

Wei ZhuRui WangJia ZuoCheng LinFanlu Min

出版	ASTM International, 2014
URL	http://books.google.com.hk/books?id=yil4zgEACAAJ&hl=&source=gbs_api

註釋The non-self-supporting materials that are often encountered in practice include shield tunnel grout, cement mortar, mine tailings, and dredged sludge. These materials typically have characteristics of high moisture content and high flowability. So far, a complete mechanical process (e.g., consolidation and shearing) of the non-self-supporting materials has not been well characterized because the materials of high flowability cannot be tested directly in conventional triaxial test equipment. This paper presents an improved triaxial test method capable of preparing the flowable specimens and testing them in a conventional triaxial apparatus. The procedure includes: (1) a flowable specimen prepared in the split mold and forced to be erective through a small confining pressure applied to the holes built in the split mold, (2) the split mold was detached from the specimen using the specially designed components and remained in the triaxial cell, and (3) the specimen was then subjected to the consolidation and shearing test. The improved triaxial test method was used to test the shield tunnel grout, dredged sludge, and the dry sand in an isotropically consolidated undrained shear condition. The test results indicated the improved triaxial method was used successfully to simulate the stress-strain behavior of the non-self-supporting materials in a holistic manner.