A sandstone bed with RQD 70 and 26 0 kN m 3 lies beneath 1 5 m of overburden soil A 2 0 m 2 0 m square foundation is to be placed on top of the sandstone rock (i e , at a 1 5 depth below the ground level) to carry a column load The unit weight of the soil is 18 0 kN m 3 Assuming the rock strength parameters from Problem 7 17, determine the maximum load that can be allowed on the foundation with the safety factor FS 3 The compressive strength f ' c of concrete is 30 0 MN m 2 Problem 7 17 A sandstone rock specimen has q uc 50 MN m 2 and ' 35 Find c '

Question: A sandstone bed with RQD = 70% and = 26.0 kN/m 3 lies beneath 1.5 m of overburden soil. A 2.0 m 2.0

A sandstone bed with RQD = 70% and γ = 26.0 kN/m³ lies beneath 1.5 m of overburden soil. A 2.0 m × 2.0 m square foundation is to be placed on top of the sandstone rock (i.e., at a 1.5 depth below the ground level) to carry a column load. The unit weight of the soil is 18.0 kN/m³. Assuming the rock strength parameters from Problem 7.17, determine the maximum load that can be allowed on the foundation with the safety factor FS = 3. The compressive strength f'_c of concrete is 30.0 MN/m².

Problem 7.17

A sandstone rock specimen has q_uc = 50 MN/m² and ϕ' = 35°. Find c'.

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