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Q. Explain Strain compatibility in mini-piles?
In designing the axial capacity of mini-piles, grout can be taken into account in the contribution of axial load capacity. Though the total load capacity of min-piles can't be equivalent to the sum of individual capacity derived from grout and from steel H-section. Reason behind this is that vertical loads on mini-piles are shared among grout and steel sections based on their Young's modulus and areas. Essentially in order to comply with strain compatibility criterion, steel bars and grout will deform as a whole though they possess different stiffness. A case may occur in which the sharing of loads for grout can be too high that cracks the grout section and fails the mini-piles already before the whole pile section could obtain the full design load that is presumed to be the sum of individual capacities. Henceforth strain compatibility has to be checked in designing vertical capacity of min-piles.
The liquid limit and plastic limit of clay are 100% and 25%, respectively. From a hydrometer analysis it has been found that the clay soil having of 50% of particles smaller than 0
Question What are thought in determining whether casings have to be left in for mini-piles ? Answer Contrary to most of pile design, design of min-piles is controlled
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