Since a grouting experiment was planned within the LCS project which aims at investigating the hydrochemical and hydraulic changes induced due to rock grouting, a new removable packer system was designed (Figure 1).
Figure 1: New packer system designed for grouting experiment.
In order to test equipment and test procedures for grout injection, a test was carried out in one of the LCS boreholes (LCS 06-001). Figure 2 shows the field setup. Parallel to the test standard lab tests were performed to assure the quality of the grout material and to provide the necessary data for later modelling purposed.
Figure 2: Field setup of cement injection test.
The results of the groute tests are summarised in Figure 3.
Figure 3: Results of grouting test
The pre-test showed that the equipment developed for grout injection is applicable for the intended purpose. Furthermore, the fact that grout was observed in LCS07-02 (at about 8m) showed that grout penetration occurred over several meters – far more than what was expected.
Long-Term Cement Studies (LCS) Experiment