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Weathered rock or IGM (Intermediate Geo Materials) is still a controversy in designing bearing capacity of bored pile. At present, Vietnamese standards separately define the load capacity in soils and rocks. That leads to both underestimation and overestimation in case IGM assumed to be soil and rock respectively. In this paper, the calculation in a project in Central Vietnam was based on experienced equations. Furthermore, static load tests compression tests were conducted for bored piles with 0,8m in diameter which installed in the weathering rock. In these test, instruments were installed including the strut meter, straingage and extensometers which were distributed along bored piles to measure a side bearing capacity and tip capacity of the piles. Results can be used to corrected side resistance and tip resistance in case when pile is installed in IGM layer. Keywords: weathered rock; IGM; bearing capacity; static load test.

Đánh giá sức chịu tải cọc khoan nhồi trong lớp đá nứt nẻ từ kết quả thí nghiệm và mô hình phần tử hữu hạn