Question 7.5: Dynamic compaction To prepare the subgrade for a section of ...
Dynamic compaction
To prepare the subgrade for a section of Interstate 65 in Alabama, dynamic deep compaction was selected to improve cone penetration values, q_{c} from values as low as 25 kg/m² to greater than 100 kg/m² . A conventional crawler crane was used to drop a 20 ton circular weight (diameter = 3 m) from a height of 18.3 m. Estimate the depth of influence, assuming the subsurface is granular and free-draining.
Using Equation (7.21) (see Table 7.4), we have:
D_{e} = 0.5 [W_{x} h_{x}]^{0.5 } (7.21)
D_{e} =0.5\sqrt{W_{x} h_{x} } =0.5\sqrt{\left(20 ton\right)\left(18.3 m\right) } =9.6| Table 7.4 Summary of effective depth equations | ||
| a | Menard and Broise Method (1975) | |
| D_{e} = [W_{x} h_{x}]^{0.5} | (7.20) | |
| b | Leonards–Cutter–Holtz Method (1980) | |
| D_{e} = 0.5 [W_{x} h_{x}]^{0.5 } | (7.21) | |
| c | Lukas Method (1980) | |
| D_{e} = (0.65–0.80) [W_{x} h_{x}]^{0.5 } | (7.22) | |
| d | Charles–Burford–Watts Method (1981) | |
| D_{e} = 0.4d [(E/A) (1/d) (1/s)]^{0.5} | (7.23) | |
| e | Fang and Ellis Method (1995) | |
| D_{e} = \Psi [W_{x} h_{x}]^{0.5} | (7.24) | |
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