Estimate settlement of a building due to nearby dewatering activities- 2021 GeoPrediction

The objective of the GeoPrediction competition is to develop an accurate
prediction of geotechnical behavior given information regarding
subsurface, boundary, and initial conditions, as well as the geotechnical/
structural/hydraulic loading. The GeoPrediction competition may involve
using available geotechnical software, empirical correlations, or developing a simple but accurate computer code for making this prediction.
For the 2021 GeoPrediction, the competing teams will develop the estimated settlement of a building due to nearby dewatering activities.

PROJECT DESCRIPTION
* Existing Conditions
An existing six-story building (existing building 1) is located at a site shown in Figure 1. This building is founded on a mat foundation. Construction of this building proceeded as follows:
1. First, approximately 5 feet of gravel fill was placed at the site extending significantly in all directions from the building footprint.
2. An approximately 10-foot excavation was made for the building.
3. The mat foundation and building were constructed.
4. The bearing pressure from the building at the mat foundation is approximately 1520 psf.
5. Settlement was measured over several decades at the edge of the building (shown in Figure 1).
6. At end of primary consolidation, 29.5 inches of settlement had occurred.
7. The current elevation of the mat foundation of the building is 228.0 feet.

*New Construction
A new building (many years after the construction of the existing building) is constructed adjacent to the existing building (Figure 1). The sequence of construction is as follows:
1. Borings B1, B2, and B3 were completed. Soil tests were completed on samples and are presented in Tables 2, 3, and 4.
2. A stable groundwater table was observed in borings B1, B2, and B3.
3. Excavation for the building began. Groundwater pumping (at the location shown in Figure 1) was started as the excavation progressed. It took 59 days for the excavation to reach the final level of the new building foundation at 220.0 feet.
4. For a period of time, the pumping lowered the groundwater table at the excavation a few feet below the excavation as shown in Table 4 and Figure 5.
5. The existing building was monitored for settlement as excavation and groundwater pumping took place.
6. At day ‘0’ shown in Table 4, the existing building had already settled 29.5 inches and the end of primary settlement had occurred.
Your task is to estimate how much settlement occurred at the measurement location in Figure 1 after 150 and 285 days of groundwater pumping at the adjacent site. Three borings are provided for your reference along with laboratory testing. High precision instruments placed along the excavation wall and between the excavation and building showed that vertical settlement of the existing building was not influenced by excavation activities and only resulted from a lowering of the water table.