Pile Driving Questions and Answers with complete solution

Pile Driving Questions and Answers with complete solution Piles can be classified on the basis of either their use or the materials from which they are made. - True Sheet piles are used primarily to create a rigid barrier for earth and water. - True Load-bearing piles are used primarily to transmit structural loads. - True The friction pile transmits the load to the soil through the pile's lower tip. - False The end-bearing pile transmits the load to the soil through skin friction between the surface of the pile and the soil. - False Sheet piles are used for cutoff walls under dams, cofferdams, bulkheads, and trenching. - True If timber piles remain permanently wet they can have a very long service life. - True Untreated timber piles can have a very long service life. - False Square and octagonal concrete piles are cast in vertical forms. - False Precast concrete piles can be removed from the forms as soon as the concrete has a compressive strength of 3,500 psi. - True Concrete piles cure for 21 days or more to reach driving strengths. - True A way of reducing driving stresses on a pile is by inserting an adequate cushioning material between the pile driver's driving cap and the top of the concrete pile. - True Pile cushions are used on steel piles or timber piles. - False Driving stresses are not proportional to the ram impact velocity. - False When soil layers with low resistance are encountered, it is important to increase the ram velocity or stroke of the hammer to have a critical tensile stresses in the pile. - False For cylinder piles, it is important to prevent the soil plug inside the pile from rising to an elevation above the level of the existing soil on the outside of the piles, thus creating unequal stresses in the pile. - True Nondisplacement cast-in-place concrete piles require a shell or a pipe. - False Typical compressive strengths for the grout are 3,000 to 5,000 psi. - True Concrete piles are more suitable than any other type of piles for constructing foundations that require piles driven to great depths. - False Compared by pile length, concrete piles tend to be more costly than steel piles. - False Steel piles have a high load-carrying capacity for a given weight of pile than concrete piles. - True Compared with concrete piles, steel H piles have better driving characteristics and can be installed to great depth. - True Steel pipe piles can be susceptible to deflection on striking boulders, obstructions, or an inclined rock surface. - False