A proposed building is to have three levels of underground parking, as shown in the figure below. To construct this building, it will be necessary to make a 10.0 m excavation, which will need to be temporarily dewatered. The natural and dewatered groundwater tables are shown, and the medium clay is normally consolidated. The dewatering of the area under the existing building caused an increase in vertical effective stress. 5 m | B y=19.5 kN/m -28 m- Existing building Natural Dewatered y dz Sand- (assume imcompressible) Medium clay 42m A Proposed 1.5 m building 8.5 m 2.5 m C/(1+eo)= 0.26 y = 16.5 kN/m³ Stiff soils (assume imcompressible) 10 m V 1.7 12.5 m- z 1.5 m Y=20.0 kN/m³. 10.3 m Unit weight of SAND above the water table is 19.5 KN/cum while that below the water table is 20 KN/cum. The unit weight of CLAY is 16.5 KN/cu.m. The chief engineer is concerned that this dewatering operation may cause excessive settlement in the adjacent building and has asked you to: Compute for the anticipated differential settlement across the width of this building (between A and B) (in mm). Compute the primary consolidation settlement of the clay layer below point A due to the dewatering process (in mm). Compute for the primary consolidation settlement of the clay layer below point B due to the dewatering process (in mm).
A proposed building is to have three levels of underground parking, as shown in the figure below. To construct this building, it will be necessary to make a 10.0 m excavation, which will need to be temporarily dewatered. The natural and dewatered groundwater tables are shown, and the medium clay is normally consolidated. The dewatering of the area under the existing building caused an increase in vertical effective stress. 5 m | B y=19.5 kN/m -28 m- Existing building Natural Dewatered y dz Sand- (assume imcompressible) Medium clay 42m A Proposed 1.5 m building 8.5 m 2.5 m C/(1+eo)= 0.26 y = 16.5 kN/m³ Stiff soils (assume imcompressible) 10 m V 1.7 12.5 m- z 1.5 m Y=20.0 kN/m³. 10.3 m Unit weight of SAND above the water table is 19.5 KN/cum while that below the water table is 20 KN/cum. The unit weight of CLAY is 16.5 KN/cu.m. The chief engineer is concerned that this dewatering operation may cause excessive settlement in the adjacent building and has asked you to: Compute for the anticipated differential settlement across the width of this building (between A and B) (in mm). Compute the primary consolidation settlement of the clay layer below point A due to the dewatering process (in mm). Compute for the primary consolidation settlement of the clay layer below point B due to the dewatering process (in mm).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A proposed building is to have three levels of underground parking, as shown in the figure below. To
construct this building, it will be necessary to make a 10.0 m excavation, which will need to be
temporarily dewatered. The natural and dewatered groundwater tables are shown, and the medium
clay is normally consolidated. The dewatering of the area under the existing building caused an increase
in vertical effective stress.
- 28 m -
Existing building
A
B
Proposed
1.5 m building
Natural y.
Dewatered
y = 19.5 kN/mª
5 m
1.51
8.5 m
10 m
12.5 m
Sand-
(assume imcompressible)
2.5 m
Fy= 20:0 kN/m.
Medium clay C(1+ eo) = 0.26
y = 16.5 kN/m³
10.3 m
Stiff soils (assume imcompressible)
Unit weight of SAND above the water table is 19.5 KN/cum while that below the water table is 20
KN/cuM. The unit weight of CLAY is 16.5 KN/cyM.
The chief engineer is concerned that this dewatering operation may cause excessive settlement in the
adjacent building and has asked you to:
Compute for the anticipated differential settlement across the width of this building (between A and B)
(in mm).
Compute the primary consolidation settlement of the clay layer below point A due to the dewatering
process (in mm).
Compute for the primary consolidation settlement of the clay layer below point B due to the dewatering
process (in mm).
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