Groundwater control to the rescue: two case histories

1979 ◽  
Vol 16 (4) ◽  
pp. 716-733
Author(s):  
J. L. Seychuk ◽  
L. R. Lahti
Keyword(s):  
Granular Material ◽  
Groundwater Level ◽  
Steel Sheet ◽  
Pumping Test ◽  
Sheet Pile ◽  
Case Histories ◽  
Mine Shaft ◽  
Local Depression ◽  
First Case ◽  
Groundwater Lowering

Two case histories are discussed where groundwater lowering was used to permit completion of excavations that experienced problems because of the lack of groundwater control.The first case involved a 4.1 m diameter tunnel, some 26 m below grade, within a clay stratum sandwiched between two water-bearing, granular deposits. Several collapses of the tunnel roof occurred because of a local depression in the surface of the clay stratum, allowing the upper, water-charged granular material to flow into the tunnel. Subsequent investigations indicated the feasibility of lowering the groundwater level by means of an eductor well system, allowing completion of the tunnel in relatively dry conditions.The second case describes groundwater problems associated with the sinking of a 21 m deep exploratory mine shaft through water-bearing silts and sands. Three attempts at sinking the shaft without groundwater control had failed. Therefore, based on the results of a pumping test, eductor wells were installed around a steel sheet pile cofferdam to permit the successful sinking of the shaft to bedrock.

scholarly journals Fundamental Study on Seismic Resistant Behavior of Caisson Type Breakwater Foundation Reinforced by Steel Sheet Pile and Gabion

2016 ◽  
Vol 16 (1) ◽  
pp. 1_184-1_204 ◽  
Author(s):  
Hemanta HAZARIKA ◽  
Tadashi HARA ◽  
Kengo NISHIMURA ◽  
Naoya YAMASAKI ◽  
Naoya MONJI ◽  
...  
Keyword(s):  
Steel Sheet ◽  
Sheet Pile ◽  
Fundamental Study ◽  
Seismic Resistant

scholarly journals EVALUATION OF BENDING BEHAVIOR OF STEEL SHEET PILE WITH CONCRETE COATING

2013 ◽  
Vol 67 (1) ◽  
pp. 521-528
Author(s):  
Yasuhiro NAGASAKI ◽  
Tetsuya SUZUKI ◽  
Shuichi KOBAYASHI ◽  
Koki SATOH
Keyword(s):  
Steel Sheet ◽  
Sheet Pile ◽  
Concrete Coating ◽  
Bending Behavior

Reduced Modulus Action in U-Section Steel Sheet Pile Retaining Walls

2010 ◽  
Vol 136 (3) ◽  
pp. 439-444 ◽  
Author(s):  
R. W. Mawer ◽  
M. P. Byfield
Keyword(s):  
Steel Sheet ◽  
Retaining Walls ◽  
Sheet Pile ◽  
Reduced Modulus

Application of Incremental Method in Design & Construction of Steel Sheet-Pile Cofferdam

2012 ◽  
Vol 18 (3) ◽  
pp. 1766-1772
Author(s):  
Zheng Zhi Xia ◽  
Guang Song Guo ◽  
Guo Ming Li
Keyword(s):  
Steel Sheet ◽  
Sheet Pile ◽  
Incremental Method ◽  
Design Construction

Optimized Design of Larsen Steel Sheet Pile Supporting Structure Based on Parameter Sensitivity

2014 ◽  
Vol 501-504 ◽  
pp. 770-776 ◽  
Author(s):  
Jin Rong Xie ◽  
Ba Tong Li ◽  
Pi Hui Chen ◽  
Yu Qiong Zhuang
Keyword(s):  
Steel Sheet ◽  
Three Dimensional ◽  
Horizontal Displacement ◽  
Optimized Design ◽  
Sheet Pile ◽  
Supporting Structure ◽  
Geological Conditions ◽  
Key Factor ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Based on the transformation project of rain and sewage diversion in a city, the optimized design of Larsen steel sheet pile supporting structure in pipe-pit excavation was made. Using three-dimensional finite element method to analyze the retaining characteristics of Larsen steel sheet pile, soil deformation of adjacent transverse brace in the middle position and surface subsidence were regarded as design control indicators; through numerical analysis of the geological conditions, load, pile length, horizontal interval of transverse brace and other factors on the sensitivity of the design control indicators, horizontal displacement of brace was regarded as a key factor in the optimal design, and accordingly, related optimized program was proposed. The implementation results show that the optimized scheme can improve the efficiency of construction, protect the safety of construction, and provide a reference for the design and construction of similar projects.

Severe Pre-Eclampsia in Multiparous Women: Indication of an Environmental Triggering Agent?

1987 ◽  
Vol 32 (1) ◽  
pp. 8-10 ◽  
Author(s):  
D.C. Kilpatrick ◽  
E.C. Jazwinska ◽  
W.A. Liston ◽  
G.E. Smart
Keyword(s):  
Laboratory Data ◽  
Infectious Agent ◽  
Clinical Syndrome ◽  
Case Histories ◽  
First Case ◽  
Multiparous Women ◽  
History Of ◽  
Maternal Immune Response ◽  
First Time ◽  
Normotensive Pregnancy

Two case histories are described with conflicting implications for the etiopathogenesis of pre-eclampsia. In both, typical proteinuric pre-eclampsia developed despite a history of previous normotensive pregnancy. In the first case, the disease was associated with a change of husband, consistent with the view that pre-eclampsia arises from an inadequate maternal immune response to paternal antigens inherited by the fetus. The second case, however, concerned a woman who developed pre-eclampsia for the first time in her third pregnancy by the same reproductive partner. We conclude that either more than one underlying cause can result in the clinical syndrome of pre-eclampsia, or that pre-eclampsia is caused by an environmental factor. The possibility that pre-eclampsia may be initiated by an infectious agent is briefly explored in the light of the clinical histories described and well-established epidemiological, clinical and laboratory data.

Sign in / Sign up

Export Citation Format

Share Document