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Abstract Two groups of in-situ tests with two testing piles in each group，which were part of testing engineering for Hong Kong-Zhuhai-Macao Bridge in China，were finished by Tomer-cell method(self-balanced method called in China). The side frictions of the testing piles in moderate weathered granite were analyzed by observing the axial force and the moving of pile toe，pile top and the pile section at top of moderate weathered granite during applying static axial compressive load through a group of jacks located in certain section in moderate weathered granite. The rock strength and integration level in location of each group were different but the load-settlement curve of each pile was all like a sudden-falling one. For the piles in the group located in broken rocks with lower strength，the side frictions of piles above the jacks were less than those under the jacks；but the side frictions of piles above and under the jacks were nearly the same for the other group located in little broken rocks with higher strength. The ratio of side friction to rock strength was higher when the rock strength was greater for the pile section above the jacks，but for the pile section under the jacks，such ratio was lower.
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Received: 03 May 2012
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2013, Vol. 32 
