CTI provides tunnel monitoring services related to engineering site monitoring and measurement. "The monitoring and measurement plan should be comprehensively selected based on the surrounding rock conditions, surrounding environment, tunnel depth, section size, excavation method and design requirements. Monitoring and measurement are divided into necessary There are two types of test items and selective test items. The required test items are the daily monitoring and measurement items that should be carried out in the tunnel engineering; the selected test items are the monitoring and measurement items to meet the special requirements of design and construction. The geological sketch is carried out in time after the tunnel excavation And digital imaging, and physical mechanics tests if necessary."