*3.4. Strain of the Steel Chassis*

The strain variations in the steel chassis, which bears the vertical loads of the whole mobile body, are collected by the strain gauges and automatically accessed by the computer in this case. Taking one strain gauge on each side of the chassis for the typical examples, their locations are presented in Figure S1, and the corresponding strain variations are shown in Figure 9, where SE, SW, SN, and SS denote the strain gauge attached on the east, west, north, and south steel chassis beams. During both the westward and northward movements, a good correlation in the strain variations can be found for the SE and SW curves, and also for the SN and SS curves, which indicates the synchronous moving process of the opposite steel beams and further provides a guarantee for maintaining the integrity and availability of the curtilage. The strains of the north and south beams are higher than those of the east and west beams in Figure 10a, which are induced by the horizontal pushing force provided by the push-in jack during the first westward monolithic movement stage. Moreover, the strains of the east and west beams are nearly zero, which proves that there is little or no deformation of them. Similarly, the higher strain of the north and south beams and the near-zero strain of the east and west beams are shown in Figure 10b during the northward stage. Furthermore, it is interesting to notice that, despite the reasonable amplitude of these curves, the strains for all the studied chassis beams are less than 0.04%, which is far less than the yield strain of the steel material, helping to confirm that steel chassis are keeping in the elastic range during moving to the new location.

**Figure 9.** (**a**) The distribution of the serious inclinometers; the displacements measured by: D01 along the (**b**)*Y*<sup>1</sup> and (**c**) *Z*<sup>1</sup> directions and D02 along the (**d**) *Y*<sup>2</sup> and (**e**) *Z*<sup>2</sup> directions.

**Figure 10.** Strain variations during the (**a**) westward and (**b**) northward movement.
