【Daily Question】Utilities – Civil Engineering – 20190826
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Which of the following statements is correct? ( ) A. Blasted expansion cast-in-place piles are suitable for use in soft soil and newly filled soil. B. Blasted expansion cast-in-place piles are easy to drill, require less labor, have low costs, and offer high bearing capacity. C. When the design elevations of the pile foundations differ, the order of piling should be from shallower to deeper levels. D. When the specifications of the piles vary, the order of piling should be from smaller to larger diameters, and from shorter to longer lengths. 【Answer】B 【Explanation】Blasted expansion cast-in-place piles are created by utilizing the rapid expansion of gases after an explosion, which compresses the surrounding soil and thus forms a pile hole; this increases the density of the soil surrounding the pile hole, thereby enhancing the pile’s bearing capacity. For soft soil and newly filled soil, their softness and high porosity result in poor compaction, inadequate blasting effects, and irregular hole shapes; therefore, they are not suitable for use in such materials, so option b is the correct choice.
A. Blasting-expanded cast-in-place piles are suitable for soft soil and newly filled soil
B. The explosive expansion pile drilling method is simple, labor-saving, cost-effective, and results in piles with high bearing capacity
B. The explosive expansion pile drilling method is simple, labor-saving, cost-effective, and results in piles with high bearing capacity
B. The explosive expansion pile drilling method is simple, labor-saving, cost-effective, and results in piles with high bearing capacity