科研之友
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摘要
The publication of the 2015 supplement for the German VOB 2012 standard will result in major changes for the ground investigation for geotechnical engineering. This relates not only to the concept of geotechnical "homogeneous areas" but also to the rock and soil properties to be determined. In the field of abrasivity investigation of soil and rock the supplement dated from 2015 sets "standards" in Germany. The "CERCHAR test" referred to for hardrock application represents a valuable, reproducible and economical procedure with an extensive background of national and international experiences. However, for application in hard rock, further development could include the application of mineralogical-petrographical approaches for abrasivity assessment. In contrary, the "LCPC-test" referred to for soil application features highly simplified testing conditions that may imply a number of new testing related problems. For instance, clay, silt, and sand fractioned soils generally cannot be analysed by this method, if the referred standard is applied. Additionally, a variety of quite relevant wear-related soil parameters are neglected or changed significantly during sampling and sample preparation. These aspects give rise to the question, whether the objective of a reliable determination of the abrasiveness of soils has already been achieved by referring to the LCPC testing procedure. For application in soils a significant advance could be a focus on geological and geotechnical approaches and indices based on conventional "intrinsic" soil properties.
- 出版日期2016-5
