It is proved that the stretching values with the wrest wrench are almost the same as those with the stress gauge monitoring method, but the former method is simpler and.

It is proved that the stretching values with the wrest wrench are almost the same as those with the stress gauge monitoring method, but the former method is simpler and more feasible.

In-situ stress measurements were made in a survey tunnel using the hollow inclusion stress gauge in order to gain knowledge of the present stress state of the Pushihe hydropower station.