Presentation is loading. Please wait.

Presentation is loading. Please wait.

LAND SUBSIDENCE AND EARTH FISSURES IN ARIZONA Ching Sheng, Seah (ID 4147549) ‏ Melanie Poller (ID 2106795) ‏ Nhu Quynh Thi Nguyen(ID 4112793) ‏

Similar presentations


Presentation on theme: "LAND SUBSIDENCE AND EARTH FISSURES IN ARIZONA Ching Sheng, Seah (ID 4147549) ‏ Melanie Poller (ID 2106795) ‏ Nhu Quynh Thi Nguyen(ID 4112793) ‏"— Presentation transcript:

1 LAND SUBSIDENCE AND EARTH FISSURES IN ARIZONA Ching Sheng, Seah (ID ) ‏ Melanie Poller (ID ) ‏ Nhu Quynh Thi Nguyen(ID ) ‏

2 Content Problems Geological Aspects Solutions

3 Earth fissure damage to residence in Nevada (photo by John Bell) ‏

4 Fissure gully near Picacho, Arizona (Photo by S.R. Anderson, USGS)

5 Fissure gully crossing below above- grade pipe at a mine facility in Nevada (photo by AMEC presented in 2004 ADOT workshop) ‏ Central Main Lateral Canal of the CAP crossing the Picacho earth fissure (photo by Michael Carpenter) ‏

6 SUMMARY OF THE PROBLEMS Increasing of all water use Warming climate RESULTS: Cracking of buildings Damage to roads, railway, storm sewers, underground pipelines,canals, etc. Cracks without advance warning

7 SUBSIDENCE Groundwater withdraw from aquifers in sedimentary basin Bowl-shaped depression EARTH FISSURES AND FISSURE GULLIES Cracks, seams or separations The sediment properties and stresses results in a subsurface rupture or separation Fissure Gullies: erosive forces move sediment downward

8 CRACK FORMATION Withdrawal of groundwater in the center Clay beds and other formations -thickest in the center - thinner toward the edges Overlying alluvium rotate (Herman Bouwer - Land Subsidence and Cracking Due to Ground – Water Depletion) SUBSIDENCE A B E F COMPRESSION D C

9 CRACK FORMATION Groundwater withdrawal - ridge - alluvial materials - thicker Linearly increasing subsidence Overlying slabs rotate (Herman Bouwer - Land Subsidence and Cracking Due to Ground – Water Depletion) COMPRESSIBLE BEDS COMPRESSION SUBSIDENCE CRACK

10 MONITORING AND POST CONSTRUCTION REMEDIAL ACTION Solution:

11 SUBSIDENCE MONITORING G eographic I nformation S ystem ( GIS ) + Close Range Photogrammetric System

12 G lobal P ositioning S ystem ( GPS ) Management tool S chedule I dentify E valuate

13 POST CONSTRUCTION REMEDIAL ACTION K eep W ater P ath A way from earth fissures Sealing of surface earth fissures + Diversion of Drainage Prevent erosion of surface flows -large gullies Solution: Clay + Bentonite mixed with soil + Soil cement (Good in treating Enlarged fissures) Filling with Gravel (less succesfull)

14 Using Cutoff Wall: Sheet Piling Cutoff Walls Water Path – Earth Fissure – deep – stability (Successful but hairline cracks developed) Geotextile Cutoff Barriers

15 THANK YOU!!


Download ppt "LAND SUBSIDENCE AND EARTH FISSURES IN ARIZONA Ching Sheng, Seah (ID 4147549) ‏ Melanie Poller (ID 2106795) ‏ Nhu Quynh Thi Nguyen(ID 4112793) ‏"

Similar presentations


Ads by Google