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| Research on Soil Testing Data Influence by Different Drilling Methods in Beijing Area |
| LIU Zhen-Tian1, HOU Dong-LI2 |
| 1.The Third Survey and Design Institute of China Railway, Tianjin 300142, China; 2.Beijing Geotechnical Institute Beijing 100800, China |
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Abstract Research purposes: The aim of the research is to insure the collection of experimental data obtained with the methods of hammering core drilling and rotary drilling in Beijing area with high quality, to analyze the relation among different work methods and to provide reliable technical basis for the selection of substitute drilling method in allusion to the strata characteristics in Beijing area.
Research methods: The analysis which influences soil sample test indices with methods hammering core drilling and rotary drilling is quantitatively. And some test indices obtained from different geological units in Beijing area are selected and studied contrastively.
Research results: In accordance with the geological condition in Beijing area and geological properties along the purposed railway line, the hammering core drilling can be adopted as the primary work method in general geological layers. While in other strata, it can be one of the auxiliary methods.
Research conclusions: After the contrastive study of different samples with the two work methods, there is little influence in void ration, water content, liquid index. The compressive modulus is higher 15% in hammering core drilling. But, there is big influence index of soil testing in soft cohesive soil (IL≥0.75).
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Received: 08 June 2006
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林宗元.岩土工程勘察设计手册[M].沈阳:辽宁科技出版社,1994.
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2006, Vol. 23 
