landslide case histories in bolivia gabriel rodriguez roca (er
TRANSCRIPT
Geohazards – Risk Assessment, Mitigation and Prevention
Landslide case histories in Bolivia
Gabriel Rodriguez Roca (ER)
GTUMSS-University of San Simon
GEO-RAMP Symposium, Barcelona October 2016
1. INTRODUCTION
2. URBAN LANDSLIDE: PAMPAHASI-CALLAPA (LA PAZ)
3. RURAL LANDSLIDE: LANDSLIDE EL SILLAR
4. CONCLUSIONS
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URBAN LANDSLIDE: PAMPAHASI-
CALLAPA (LA PAZ)
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• .
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AFFECTED AREA
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First event: Creek Papani, Chulluncani
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Second Event. Sector Valle de las Flores
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Thirth Event. East Slope. Low Pampahasi
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4ht Event. South-West slope. Cementry
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5th Event
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• .
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Situation after earth movenments
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19 drillholes
30 pits
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γ
[KN·m-3]
γ sat
[KN·m-3]
Modulo de
Poisson, [-]
Modulo de
deformación
[MPa]
C'
[KN·m-2]ɸ' [°]
C' residual
[KN·m-2]
ɸ' residual
[°]
K
[m·s-1]
UGT 1 21 23 0,28 125 27 33 0 255·10
-7
5·10-2
UGT 2 19 21 0,30 40 0 26 0 215·10
-8
5·10-4
UGT 3 20 22 0,29 100 15 30 0 255·10
-9
5·10-6
UGT 4 19 21 0,33 90 9 25 0 205·10
-10
5·10-4
UGT 5 22 24 0,28 120 61 37 0 325·10
-10
5·10-7
UGT 6 21 23 0,29 105 52 36 0 315·10
-9
5·10-6
UGT 7 20 22 0,30 30 12 21 0 165·10
-9
5·10-6
UGT 8 21 23 0,27 100 25 27 0 225·10
-8
5·10-2
UGT 9 20 22 0,34 85 27 30 0 255·10
-10
5·10-6
UGT 10 20 22 0,35 20 18 24 0 195·10
-10
5·10-5
UGT 11 18 20 0,30 50 0 32 0 275·10
-6
5·10-4
UGT 12 20 22 0,29 90 0 30 0 255·10
-8
5·10-5
Unidad
Geotécnica
PARÁMETROS
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Chuluncaqui
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0.9860.9860.986
W
W
0.9860.9860.986
Safety Factor
0.000
0.500
1.000
1.500
2.000
2.500
3.000
3.500
4.000
4.500
5.000
5.500
6.000+
37
00
36
50
36
00
35
50
0 50 100 150 200 250 300 350 400 450
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0.9780.9780.9780.978
MaterialName
ColorUnit Weight
(kN/m3)Strength Type
Cohesion(kN/m2)
Phi
UGT 1 21 Mohr-Coulomb 27 33
UGT 1
Safety Factor
0.000
0.500
1.000
1.500
2.000
2.500
3.000
3.500
4.000
4.500
5.000
5.500
6.000+
50
04
00
30
02
00
10
00
0 100 200 300 400 500 600 700 800 900 1000 1100
Back analysis. 3th Event
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1.216
1.880
1.360
2.137
1.216
W
W
1.216
1.880
1.360
2.137
1.216
UGT 8
UGT 1
UGT 6
UGT 3
UGT 4
UGT 9
UGT 10
UGT 5
UGT 7
Muro 29
Muro 30
Muro 31
Muro 32
Safety Factor
0.000
0.500
1.000
1.500
2.000
2.500
3.000
3.500
4.000
4.500
5.000
5.500
6.000+
42
00
40
00
38
00
36
00
0 200 400 600 800 1000 1200 1400 1600
0+260 con muros y abatimiento 10 m
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1.2041.204
W
W
1.2041.204
UGT 1
UGT 8
UGT 6
UGT 9
UGT 10
UGT 7
UGT 5
UGT 3
UGT 4
UGT 2
Safety Factor
0.000
0.500
1.000
1.500
2.000
2.500
3.000
3.500
4.000
4.500
5.000
5.500
6.000+
37
40
37
30
37
20
37
10
37
00
230 240 250 260 270 280 290 300 310 320 330
0+220 con tierra armada
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Section 3
Phase2 V8
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Section 5
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STABILIZATION WORKS
• Resloping
• Canalization creeck Chujlluncani
• Canalization river Irpavi
• Groundwater depletion (galleries and horizontal
drains)
• Instrumentation
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RURAL LANDSLIDE: LANDSLIDE EL SILLAR
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Geophysical survey
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Surface displacements
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Inclinometers and piezometers
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Petrography
X- refraction
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• Depósitos coluviales UT1.
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Suelos residuales ( Grado VI)
UT2
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Muestra Material Parámetro determinado Valor obtenido Unidad
M137-1 Suelo Coluvial Suelo relleno, Suelo Sedimentario GM Grava Limosa con arena y bolones
--
Límite Líquido 36,7 %
Índice Plástico 11,84 %
% de arcilla 8,14 %
Contenido de Humedad 16,13 %
Peso unitario Seco, d 17,16 kN/m3
Peso unitario, 19,94 kN/m3
Ángulo de fricción Pico,´ 34 °
Cohesión Pico, c´ 14 kPa
Valor de velocidad, Vp 500 m/s
Módulo de elasticidad, E 100 MPa
Coeficiente de Poisson, 0,25 --
Geotechnical Model
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Muestra Material Parámetro determinado Valor obtenido Unidad
M137-2 Suelo residual (Zona de falla)
Arcilla restructurada CL arcilla magra arenosa
--
Límite Líquido 31,91 %
Índice Plástico 11,18 %
% de arcilla 25,18 %
Contenido de Humedad 19,2 %
Peso unitario Seco, d 17,87 kN/m3
Gravedad específica, Gs 2,76 --
Peso unitario, 21,3 kN/m3
Resistencia al corte no drenada, cu 72,30 kPa
Cohesión Pico, c 8 kPa
Ángulo de fricción Pico, 32 °
Cohesión Crítico, c 0 kPa
Ángulo de fricción Crítico, 28 °
Módulo de def. edométrica, Em 6,25 MPa
Coeficiente de consolidación, Cv 1,58E-5 cm3/s
Permeabilidad , k 3,83 E-12 m/s
Coeficiente Cs 0,042 --
Coeficiente Cc 0,175 --
Valor de velocidad, Vp 1000 m/s
Módulo de elasticidad, E 25 MPa
Coeficiente de Poisson, 0,25 --
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UT2
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• Muestra Material Parámetro determinado Valor obtenido Unidad
• M137-3 Roca Pizarra Gris medio oscuro --
• Peso unitario seco, d 22,29 (kN/m3)
• Contenido de Humedad 9,81 %
• Gravedad específica, Gs 2,74
• Porosidad efectiva, n 0,17
• Absorción, a 7,58 (%)
• Índice de durabilidad al desleimiento, d(2C) 89,17 %
• M137-4 Roca Pizarra Gris medio oscuro --
• Peso unitario seco, d 21,40 (kN/m3)
• Contenido de Humedad 9,81 %
• Gravedad específica, Gs 2,73
• Porosidad efectiva, n 0,2
• Absorción, a 9,23 (%)
• Índice de durabilidad al desleimiento, d(2) 89,17 %
• Índice de carga puntual, s(50) 1,1 MPa
• Resistencia a la Compresión Uniaxial, i 22 Mpa
• GSI=RMR-5 30
• Valor de velocidad, Vp 2000 m/s
• Índice de carga puntual 10,36 Is(50)
• Cohesión, c 0,072 MPa
• Ángulo de fricción, 32,61 °
• Módulo de elasticidad, Ei 2000 MPa
• Coeficiente de Poisson, 0,2 --
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UT3
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Modelo introducido al Plaxis (255 nodos y 254 elementos)
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Calculated desplacements
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CONCLUSIONS
- The geological conditions in the bolivian Andes require a good
geological “in situ” study ( mapping, pits, drillholes, instrumentation, etc)
- The comercial computer programms (Slide, Phase, Plaxis) is a
aceptable tool to carried out aproximated calculations. However, the
coupled models (v.g. Code Bright) will give a more realistic results.
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Thank you !!!!
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