National exhibition and convention center (NECC) is the largest single block building and exhibition complex constructed with large span structures in the world. The NECC, which has a footprint of more than 0.86 million square meters, involves nearly 0.35 million square meters ground improvement work. Depending on the soil properties, adjacent environmental condition, types of foundations, and floor loading as well as stress histories, different ground improvement techniques were adopted. Rigid pile composite foundation with a large pile spacing was adopted on huge indoor exhibition buildings for the first time in China, while the outdoor exhibition venues were improved by preloading. Considering the overconsolidation stress history and small floor loading, only soil replacement technique was adopted for the 35 kPa working load area. The monitoring results agree well with the calculated values. The ground achieved adequate overall bearing capacities as designed and the estimated ultimate ground settlement are within accepted values.
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