2 results about "Base line" patented technology

The invention discloses a base line-based subway tunnel horizontal displacement deformation monitoring method. The base line-based subway tunnel horizontal displacement deformation monitoring method comprises following steps: 1, erection of a total station is carried out, and the total station is used for acquiring two stage controlling point coordinate data; 2, two stage control base line vectors are calculated based on the two stage controlling point coordinates respectively; 3, a base line coordinate system is established based on the two stage control base line vectors; 4, the total station is used for acquiring two stage monitoring point plane coordinate data; 5, monitoring base line vectors are calculated based on controlling point coordinates and monitoring point coordinates; 6, projection of the monitoring base line vectors onto the base line coordinate system is carried out so as to obtain the components of the monitoring base line vectors in the X coordinate axis direction and the Y coordinate axis direction; and 7, the components of a same monitoring base line vector in two stages in the base line coordinate system are compared so as to obtain the deformation of the monitoring point in directions parallel to track and vertical to track in adjacent two stages. The base line-based subway tunnel horizontal displacement deformation monitoring method is capable of eliminating influences of errors caused by rendezvous and directional introduction, test process is simple and flexible, operation time is shortened greatly, and working efficiency is increased.