[Retracted] Application of Internet of Things Technology in the Construction of Bored Pile Foundation in a High Altitude Environment

Table 1

Analysis of the sonar reflection signal at the bottom of the pile.

Reflection coefficient R ＞ 0	Reflection coefficient R ＞ 0	Reflection coefficient R = 0 and the signal energy is strong	Reflection coefficient R = 0 and weak signal energy
The bedrock is soft and hard	There is a cave at the bottom of the pile	Bedrock intact	Bedrock broken