Sub Sections:
1
2
3
4
5
6
7
8
9
10
11
12
Pages:
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
Micro Piles |
Pressure Grouting |
Rock Anchors |
Permeation Grouting
Soil Nailing |
Compaction Grouting |
Micropiles |
Injection Grouting |
Chemical Grouting
Our
techniques apply when adding new structures:
especially
rock anchor,
microfine cement,
soil nailing,
micropile
installations for
foundation support.
We
specialize in
slope stabilization,
anchors,
permeation grouting,
foundation repair
and support,
grouting,
soil nails,
rock drilling,
micropile installations, and
sinkholes. We
use a
problem-solving approach geotechnical
architecture of buildings, bridges,
water plants, sewage plants, tunnels,
sinkholes,
caisson,
shoring,
underpinning,
agriculture, and
roads
construction. We
are experienced in these applications:
micro piles,
sinkhole repair,
permeation grouting, pressure
grout,
soil nails,
chemical grouting,
micropiles,
compaction grout, and
rock anchors.
Our specialties are
rock anchor,
acrylamide and
compaction grouting,
mini piles,
sinkhole repair,
micropiles,
acrylamide grouting, and
soil nailing.
We will continue to
dedicate ourselves to
excellence,
including
insurance mortgage, in our performance, in our
integrity, and in our relationships with our
customers. We will carefully weigh our
decisions, actions, and results to make sure
that we remain the most trusted name in the
geotechnical contracting industry. Please
visit our website
http://www.rembco.com/.
Add Concrete Construction URL
|
Footing Foundations
JULY
1997
4-21
Bottom of Excavation Stability
Heave and piping are problems associated with bottom of excavation stability.
Heave is the phenomena whereby the “head” of the surrounding material causes the
upward movement of the material in the bottom of the excavation with a corresponding
settlement of the surrounding material. Heave generally occurs in soft clays when the
hydrostatic head, 62.4(h + z), is greater than the weight of the overburden at the bottom of
the excavation,
.
z (Figure 4-16).
Figure 4-16: Bottom of Excavation Stability Problems due to Excess Hydro-
static Head Against an Impervious Layer
Piping is generally associated with pervious materials and can occur when an unbalanced
hydrostatic head exists. This unbalanced head may cause large upward flows of water into
the excavation, transporting material in the process, and may result in settlement of the
surrounding area. Review the Caltrans Trenching and Shoring Manual if instability
problems are suspected at the bottom of excavations.
Foundation Inspection
Inspection should include determination of the following:
1) Stability of slopes and sides of excavations conform with DOSH requirements.
2) Conformity of the foundation material with the Log of Test Borings (allowance should