San Jacinto Monument Case History

The San Jacinto Monument was built in 1936 to commemorate the $100\text{-}\text{year}$ anniversary of the victory of the Texan army over the Mexican army. The victory at the battle of San Jacinto followed the defeat at the battle of the Alamo and secured the independence of Texas, as well as several other states along the Mexican border. The monument consists of a $176.5\text{-}\mathrm{m}$ -high column resting on a large square mat with each $\text{side}=37.8\mathrm{m}$ . The mat foundation was designed by Raymond Dawson who chose an average pressure of $223.8\mathrm{kPa}$ under the mat. Dawson had settlement points placed on the mat foundation together with benchmarks away from the monument. The settlement of the monument has been recorded over the last $70\text{years}$ and shows a total settlement to date of $0.329\mathrm{m}$ . The settlement appears to be almost complete. This remarkable case history is used to evaluate current practice of calculating consolidation settlement and a best approach is suggested for such structures. Other issues addressed include the depth of influence, the time rate of settlement, the elastic-modulus approach, and the ultimate bearing capacity.