भारी संरचनाओं के लिए उपयुक्त कठोर नींव (hard foundations) आमतौर पर किस प्रकार के मिट्टी क्षेत्र में उपलब्ध होती है?

As per IS 1904, structural distress and severe cracking in structural foundations are primarily caused by:

Two columns Ca and Cb spaced 3 m centre-to-centre are subjected to axial loads of 600 kN and 800 kN, respectively. If good soil for foundation with a safe bearing capacity of 200 kN/m 2 is available at 2 m depth below ground level, identify the type of foundation that is suitable and economical. Assume the width of the footing is restricted to 2 m.