3486
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
reflect the
rent str
depths.
strength indicators of the diffe
atigraphic
If it can figure out the mechanism of the mechan
destruction of the foundation soil by the CPT test,
establishing the relationship of the CPT test foundation and
strength indicator, it will help to use the CPT data to a more
e numerical analysis method, it
selec
ical
thereby
rational extent.
In accordance with th
ts different soil strength indicators
to calculate the tip
resistance and lateral resistance, then the total penetration
resistance of CPT test is transfered. As to the comparison
between
s
p
~
data determined by the numerical analysis
and the empirical relationship proposed by the Chinese railway
specifications shown in Figure 19,
determined by the
numerical calculation is slightly larger than the value
recommended by railway specifications. After fitting
the
s
p
~
data by power function, they have good correlation
and the fitted empirical relationship is shown as follows:
0915 .0
352 .29
s
p
(8)
Fig.12 the fitting relationship of
s
p
1.5
Foundation settlement calculations based on
pressuremeter test and the static cone penetration test
parameters
With using the method motioned above, the initial tangent
modulus
along the depth can be determined by in-situ
e shear strength indicator along the depth
determ static cone penetration test. With the parameters
of tangent modulus method
，
we calculated the settlement of
each footing
based on tangent
modulus method, and compare with the measured results and
t modulus
lue
0
t
E
pressuremeter test, th
ined by
by layer-wise summation method
the calculated results of each plate by the tangen
method when average foundation inversely calculated va
0
t
E
=86MPa
，
=36°in the loading test, the result is good.
o
The result of 2# footing is showed as figure 13.
From the settlement of each plate, after using the simple
in-situ tests such as pressuremeter test and static cone
penetration test to determine the calculated parameters of each
foundation layer, the calculated settlement curves match well
with the measured curves, which indicates that it is feasible to
use pressuremeter test and static cone penetration test to
determine the tangent modulus parameters of each foundation
layer, thus calculating the nonlinear settlement of the
f undation. These ways are easier to be achieved than the plate
loading test, as well as easier to obtain the deep soil parameters.
Fig.13 2# footing(1.5m×1.5m)
2 CONCLUSIONS
By analyzing the nonlinear settlement results of five plate
loading tests by tangent modulus method on the sand foundation
in Riverside Campus, Texas A & M University, this paper
shows that the tangent modulus method can calculate the
nonlinear settlement of foundation in a better way. At the same
time, this paper also seeks more simple in-situ tests such as the
static cone penetration test and pressuremeter test to replace the
plate loading test to determine the foundation parameters
required in nonlinear settlement calculation, which achieves a
better effect. Therefore, this paper provides a more convenient
way to promote the use of the tangent modulus method to
calculate the nonlinear settlement of foundation, which is of
great significance to the improvement on the design level of the
foundation.
3 REFERENCES
[1] Schmertmann, J. H., Static cone to compute settlement over
sand, J. Soil Mech. Found. Div., ASCE, 96(8), 1011, 1970.
[2] YANG Guang-hua. The hyperbolic model for estimating
nonlinear
settlement
of
foundation[J].Ground
Improvement,1997(1):50-53. (in Chinese)
[3] YANG Guanghua. The simplified nonlinear settlement
computation method for soft foundation[J]. Guangdong
Water Resources and Hydropower,2001,(1):3–5.(in
Chinese)
[4] YANG Guang-hua. Nonlinear settlement computation of the
soil foundation with the undisturbed soil tangentmodulus
method[J]. Chinese Journal of Geotechnical Engineering,
2006, 28(11): 1927-1931. (in Chinese)
[5] Yang Guanghua, New computation method for soil
foundation settlements[J], Journal of Rock Mechanics and
Geotechnical Engineering, 2008, (4): 679-686. (in Chinese)
[6] Yang Guanghua, Wang Junhui, Application of undisturbed
soil tangent modulus method for computing nonlinear
settlement of soil foundation[J], Rock and Soil Mechanics,
2011, 32(S1): 33-37. (in Chinese)
[7] Nonlinear Settlement Computation of the Soil Foundation
Based on in-Situ Testing. Guangdong Water Resources
and Hydropower. no.7,2010. (in Chinese)
[8] American Society for Testing and Materials Committee on
Standard. Standard test method for prebored pressuremeter
testing in soils[S]. ASTM D4719, 2000
