DAM FAILURES and CONSTRUCTION INSPECTION
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1 DAM FAILURES and CONSTRUCTION INSPECTION by Hal Van Aller Maryland Dam Safety
2 Embankment Dam Schematic
3
4 Medford Quarry Wash Pond CMP failure
5 Velvet Hills sinkhole
6 Sinkhole in crest of new MD dam
7
8 WCC (Joe Kula) Testpit along pond CMP spillway
9 AACounty CMP with void
10 Loveton Dam Failure (1989) Breach
11 Anti-seep collars do not prevent seepage failures!
12 Loveton 78 CMP viewed from downstream 78 inch CMP viewed from downstream
13 Failed PVC pipe with anti-seep collar
14 Annap Mall collapsed CMP d.s. of Riser
15 Annap Mall u.s. view
16 What caused these failures? Design Construction Inspection All of the above??
17 Spillways are Confined Space
18 Ray Martin cave
19 Typical Problems schematic
20
21 Compaction in Haunches
22 Pipe Installation in Dam Flowable Fill Dam Embankment Pipe in vertical trench Filter Diaphragm
23
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25 Excavation through dam Side slopes must be 2(H):1(V) or flatter 15 ft
26
27
28 FILTER DIAPHRAGM
29 Centennial Park dam chimney drain construction
30 Filter Diaphragm flooding with water for compaction
31 Merkle Filter Diaphragm with vibrator
32
33 CONSTRUCTION Experienced contractor desired must realize that ponds are different from roads and utilities must work with design engineer compaction along spillway is critical-- don t construct embankment and then cut trench spillway joints must be watertight
34 Alternative Designs Avoid large diameter CMP User weir or drop box structure If pipes unavoidable, use: Concrete pressure pipe (min. ASTM C-361) Complete concrete cradle or flowable fill Watertight joints Filter diaphragm Avoid combining pond with road embankment
35 CHUTE SPILLWAYS SCHEMATIC
36
37 Concrete flumes on embankment have problems too
38
39 CMP spillway on steep slope through dam embankment
40 Tasker s Chance concrete weir
41 Crooksville, OHIO- COMPLETED WEIR
42 Parker Pond new sheet pile spillway
43 Do's and Don ts for Pond Design and Construction Don t use anti-seep collars to stop leakage Do use filter diaphragms Don t allow spillway installation in trench Do require watertight joints Do inspect each pipe joint as it is put together so it can be redone if necessary Do consider alternative spillway design that eliminates pipe through dam or foundation
44 Inspection More than just testing Compaction! Inspector should:! work for the design engineer, not the contractor! understand design assumptions and effects of unanticipated conditions! not allow deviation from design without design engineer s approval! observe and document: pipe mfg marks, joint type, gasket material and size, and installation procedure
45 Foundation Proof rolling Inspection by Geotechnical Engineer
46 Compaction Use STANDARD Proctor (ASTM D-698 or AASHTO T-99) Do Not use MODIFIED Proctor (ASTM D-1557 or AASHTO T-180) Nuclear gage readings need to be corrected to match lab moisture & density
47 Utility Conduits (water, sewer, gas) Pipes through the dam must meet spillway requirements No granular backfill for pipes parallel to the dam axis
48 Pre-cast riser structures
49 Movement Anchor Plates
50 Leaky Joints
51 Concrete Pipe Installation Pipe supports Clean and Lubricate joints Lubricate Gasket Tension Gasket Full concrete cradle, not just bedding If not o-ring gaskets then owner and engineer must approve
52
53
54
55 Prepare foundation and supports
56 Mudmat is a good idea
57 Clean joints
58 Lubricate joints
59 Lubricate o-ring
60 Tension o-ring with round-shaft screwdriver
61 Mis-aligned o-ring...
62 ...causes broken bell
63 Gaskets for Concrete Pipe Traditional O-ring joint Deep joint allows for substantial extensibility Symmetric design accommodates internal or external pressure
64 Newer Profile Gaskets Press-Seal Gasket Company states these advantages over o-rings: Stepped joint is cheaper to manufacture than groove for confined o-ring gasket Easier to install, less force needed to home joint Less bell breakage
65 Gaskets for Concrete Pipe New style Profile Joint Smaller joint separation allowance Designed for internal pressure
66 Gaskets for Concrete Pipe New style Profile Joint
67 Formed concrete cradle
68 Cradle poured against soil
69 Poor installation
70
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82 Take Pictures!
83 Dam on Soft Foundation
84 Spillway pipe at end of construction
85
86 Same pipe after excessive foundation settlement
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