5.5　Construction Investigation

5.5.1　The construction investigation shall be carried out in a real-time way on the premise that the detailed investigation has been done，according to the actual gedogical conditions exposed during construction excavation.

5.5.2　The construction investigation shall include the following tasks:

1　Draw gedogical maps of tunnels，shafts，and caverns，bedrock gedogical maps of cavern tops，walls，and floors，and water content figures of cavern-surrounding rocks；

2　Measure stresses of blasting relaxation zone and rock mass；

3　Carry out gedogical forecast；

4　Measure the cavern water inflow rate and predict the ground water table recovery after it is put into production；

5　Carry out an engineering gedogical study on complex gedogical problems，propose a construction plan，and if necessary，carry out a supplementary investigation；

6　Prepare the construction investigation report.