According to the excavation object, it can be divided into three types:
(1). Active excavation is carried out to solve academic problems and requires strict examination and approval and discussion. The time is uncertain, and it is mined by the approval area.
(2) With the infrastructure excavation, we don't intend to excavate at first, so we need to build roads and bridges to connect the building with the subway. In order to prevent irreparable damage to cultural relics, excavation must be carried out and the time is limited.
(3) Rescue excavation is often an emergency measure after the ruins are destroyed, which is miserable and rough.
Author: strategist Sun
Link:/question/68464040/answer/263542850
Source: Zhihu.
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3. Under the premise that technology cannot protect cultural relics, only the above three situations will be excavated (it is unlikely to be excavated in one's lifetime).