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Prova 3 - Elaborazione di una prova di taglio diretto
I risultati di una prova di taglio diretto eseguita su tre provini dello stesso terreno sottoposte a tre
valori della tensione verticale sono di seguito riportati, l'area della sezione trasversale del provino è
di 3600 mm2.
a) Disegnare il grafico sforzi-deformazioni indicando il tipo di comportamento del terreno
b) Determinare i parametri di resistenza del terreno (c’ e ’).

Provini
Carico
assiale
(kN)
deformaz.
(%)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

1

2

3

0,2

0,4
Taglio
(N)
0
33
72
110
139
164
180
192
201
217
224
230
234
237
236

0,8

0
21
46
70
89
107
121
131
136
138
138
137
136

0
45
101
158
203
248
276
304
330
351
370
391
402
410
414
416
417
417
415
140
120

 (kPa)

100
80
60
40
20
0
0,00

5,00

10,00

15,00

 (% )

20,00

140
120

 (kPa)

100
80
60
40
20
0
0

50

100

150

200

250

 (kPa)

Suggerimenti:
calcolare le tensioni normali e tangenziali in kPa (kN/m2) : ad esempio per le tensioni normali
abbiamo:
 (kPa)

56

111

222

procedere poi con il calcolo delle tensioni tangenziali
per determinare i parametri di resistenza al taglio eseguire la regressione lineare dei tre punti a
rottura individuati nel piano (, ) nel piano (, )

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Elaborazione prova di taglio diretto

  • 1. Prova 3 - Elaborazione di una prova di taglio diretto I risultati di una prova di taglio diretto eseguita su tre provini dello stesso terreno sottoposte a tre valori della tensione verticale sono di seguito riportati, l'area della sezione trasversale del provino è di 3600 mm2. a) Disegnare il grafico sforzi-deformazioni indicando il tipo di comportamento del terreno b) Determinare i parametri di resistenza del terreno (c’ e ’). Provini Carico assiale (kN) deformaz. (%) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 0,2 0,4 Taglio (N) 0 33 72 110 139 164 180 192 201 217 224 230 234 237 236 0,8 0 21 46 70 89 107 121 131 136 138 138 137 136 0 45 101 158 203 248 276 304 330 351 370 391 402 410 414 416 417 417 415
  • 2. 140 120  (kPa) 100 80 60 40 20 0 0,00 5,00 10,00 15,00  (% ) 20,00 140 120  (kPa) 100 80 60 40 20 0 0 50 100 150 200 250  (kPa) Suggerimenti: calcolare le tensioni normali e tangenziali in kPa (kN/m2) : ad esempio per le tensioni normali abbiamo:  (kPa) 56 111 222 procedere poi con il calcolo delle tensioni tangenziali per determinare i parametri di resistenza al taglio eseguire la regressione lineare dei tre punti a rottura individuati nel piano (, ) nel piano (, )