The researchers conducted tests on soft clay under different stress conditions using a special apparatus. They studied how pore water pressure changes in the clay when the stress is rotated. The results showed that the pore water pressure in the clay goes up and down as the stress changes. The angle of the initial stress and another factor called the intermediate stress coefficient both affect how much the pore water pressure changes. The researchers found that the pore water pressure increases as the stress cycles increase, but the rate of increase slows down over time. The values of the stress angles and coefficients also play a role in how much the pressure changes.