To provide an estimating method for accurately estimating the existence of a risk of the occurrence of water leakage and a position thereof by confirming the soundness of an earth retaining wall before starting excavation, and to provide a ground excavation method for safe and efficient excavation after previously taking necessary countermeasures, based on the estimation.
The water leakage position estimating method for the earth retaining wall includes calculating a transmissibility coefficient T and a radius R of influence through an initial water pumping test, performing a confirmation water pumping test before starting excavation into an excavation region 2 inside an earth retaining wall 1 to measure a water pumping amount Q and a ground water level reduction amount s in each observation hole, calculating a distance r from each observation hole 4 to a temporary sump water point, based on these values, and estimating a water leakage site 5, based on the distance r. The distance r is calculated, based on a Thiem's steady well theoretical formula. When the occurrence of water leakage is assumed by the above method after starting excavation, repairing work for the water leakage site 5 is previously performed and the confirmation water pumping test is performed again as required, and then excavation is started after no occurrence of the water leakage is estimated.
KUBO MASAAKI
YANAGI HIDEMI
| JP2010007450A | 2010-01-14 | |||
| JPH05149820A | 1993-06-15 | |||
| JPH04223244A | 1992-08-13 | |||
| JPH08311852A | 1996-11-26 |
志賀 正武
渡邊 隆
高橋 詔男