can someone point me in the right direction of how to design house piers in E class soils with AS2870? I have heard of people sleeving piers to create a "frictionless" surface between soil and pier to limit movement. Is this essential? Is the other option to make the piers deeper to effectively lock them in to the soil so their movement is limited? how do you calculate this? is there a pressure value based on the Iss or ys movement of the soil exerted on the pier, which you have to resist with an uplift calculation of the pier?
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