Vibro compaction of granular soils 77
3.4 QUALITY CONTROL AND TESTING
Once the design of the vibro compaction project has determined the geometrical extent of the treatment, together with the probe spacing necessary
to obtain the required density using the method as described in Section 3.3.1,
a suitable quality assurance program needs to be developed. The aim is to
ensure that the operating parameters so obtained are observed when executing the works by repeating it for each vibro compaction probe. Such a program will have to include all elements that are essential for a well-organized
special foundation site. For the vibro compaction process, water management
is a very important issue. It has to be channeled away from the work position into settling ponds before it is released, normally without further treatment, into the available recipient. Similarly important is the well-organized
transportation of the backfill material to the working area and its stockpiling on-site, when necessary. Continuous measurement of the added material,
together with site surface level measurements before and after compaction,
will help to evaluate compaction success after its execution.
Volumetric strain ε
v (%)
Cyclic shear strain γ xy (%)
30
N 1 = 40
M = 7.5
20
10
15
5
1
10
−3
10
−2
10
−1
10
10 −1
1
10
−2
10
−3
Figure 3.32 Relationship between volumetric strain, shear strain, and penetration resistance for dry sands. (Redrawn from Tokimatsu, K. and Seed, H.B., J. Geotech.
Eng., ASCE, 113, 861, 1987.)
3.4 QUALITY CONTROL AND TESTING
Once the design of the vibro compaction project has determined the geometrical extent of the treatment, together with the probe spacing necessary
to obtain the required density using the method as described in Section 3.3.1,
a suitable quality assurance program needs to be developed. The aim is to
ensure that the operating parameters so obtained are observed when executing the works by repeating it for each vibro compaction probe. Such a program will have to include all elements that are essential for a well-organized
special foundation site. For the vibro compaction process, water management
is a very important issue. It has to be channeled away from the work position into settling ponds before it is released, normally without further treatment, into the available recipient. Similarly important is the well-organized
transportation of the backfill material to the working area and its stockpiling on-site, when necessary. Continuous measurement of the added material,
together with site surface level measurements before and after compaction,
will help to evaluate compaction success after its execution.
Volumetric strain ε
v (%)
Cyclic shear strain γ xy (%)
30
N 1 = 40
M = 7.5
20
10
15
5
1
10
−3
10
−2
10
−1
10
10 −1
1
10
−2
10
−3
Figure 3.32 Relationship between volumetric strain, shear strain, and penetration resistance for dry sands. (Redrawn from Tokimatsu, K. and Seed, H.B., J. Geotech.
Eng., ASCE, 113, 861, 1987.)