Short Answer (50 pts) Briefly describe the (two) primary advantages of using a h

Question

Short Answer (50 pts) Briefly describe the (two) primary advantages of using a hollow stem auger over a solid stem auger when drilling. 6. 7. Write Darcy's law in radial (cylindrical) coordinates. Define all terms. When using the Flow Net method to solve for heads, under what conditions would you expect flow lines and equipotentials to abruptly change directions. 8. 9. For each of the governing equations below, indicate (by letter) the assumptions that apply (a) Homogeneous (b) Heterogeneous (c) Isotropic (d) Anisotropic (e) Steady State (f) Transient (g) Horizontal Flow (h) Confined Aquifer (i) Unconfined Aquifer ca cr ah ah ?

Explanation / Answer

6)Hollow steam auger advantages over solid steam auger

It allows for uncontaminated sampling in formations of unconsolidated soils

Rapid drilling into clay-filled soils is easy and cost-effective as compared to solid steam auger

8)Conditions for net flow heads for flow direction change:

1)hydraulic uplift force under the structure

2)under steady state conditions and the shape of the material changes the net flow direction

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