Sub Sections:
1
2
3
4
5
6
7
8
9
10
11
12
Pages:
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
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
|
Driven Piles
JULY
1997
7-35
The previous method, as outlined, is quite comprehensive. This type of analysis would
normally be done only on a large project. Where this type of analysis has proven useful is as
follows. Piles were driven in Bay Mud type material. Take-up curves were developed using
the static load tests on test piles over a given period of time. These take-up curves measured
the gain in soil resistance realized over time. All of the information was put into a WAVE
analysis. The output predicted what the blow rate and stroke should be at the time of
driving for a particular driving system. What happened in the field is that the Engineer
accepted a pile driven to specific blow rates and stroke length. The accepted blow rate and
stroke were determined using the knowledge of the increased bearing value, over time,
characteristics of the piles. If the piles had been driven using only the ENR formula, the
Contractor might still be driving them. The WAVE program allowed the user to utilize the
take-up information to model the soil characteristics more accurately. In this case it save
the owner (Caltrans) lots of money.
The advantage of wave equation analysis over pile driving formulas is that it accounts for
the physical characteristics of the pile driving system and soil resistance. A WEAP analysis
has its greatest advantage over driving formulas where the pile is driven through layers of
soft soil and a significant portion of the pile capacity is derived from skin friction. Where a
pile is driven into firm strata or bedrock, the pile often derives most of its static capacity
from end bearing. For predominantly end bearing piles, WEAP analyses for the purpose of
generating penetration/capacity relationships may not be necessary. Nevertheless, a WEAP
analysis has the capability of being able to predict potential pile overstressing during hard
driving.
Where a pile is advanced through material which can not be relied on for contributing skin
resistance, WEAP analysis provides a means of establishing pile driving criteria consistent
with design procedures. Situations where this is a concern include river channels where
scourable material is present, and sites having down-drag or negative skin friction forces
generated by soil consolidation. Because the ENR formula predicts safe rather than ulti-
mate capacity, and has an unknown safety factor, it does not provide a logical means of
considering the driving resistance contributed by these layers. WEAP is based on ultimate
pile capacity and thereby provides this capability.
Manufacturer’s Energy Ratings
Generally each manufacturer publishes a catalog or brochure for their hammer. Within the
printed information they typically will outline operating specifications, including any
specific equipment which will be required. Specifications of importance to those involved in