Monitoring method for shield breaking underground diaphragm wall construction deformation

The invention discloses a monitoring scheme for shield breaking of construction deformation of an underground diaphragm wall, two drill holes are formed in two sides of the top end of the underground diaphragm wall to be monitored, distributed optical fiber temperature strain sensors and reinforcing steel bars bundled by the optical fiber sensors are arranged in the drill holes, and concrete with the same grade as the concrete of the underground diaphragm wall is backfilled; and a static level gauge is arranged at the top of the underground diaphragm wall. The underground diaphragm wall is monitored when the shield breaks and passes through the underground diaphragm wall, the wall bodies before, during and after the shield is cut are monitored in an upper part and a lower part, data of internal deformation and external settlement of the underground diaphragm wall during construction can be collected in real time, deformation is predicted by using the collected data, safety guarantee is provided for constructi