Abstract
The thermal method is nowadays the only one that allows precise location of leaks in a shorings of a planned deep excavation, still before this excavation is made. It also allows to determine the leak intensity. As a consequence, it enables precise and early repair work, especially sealing. It allows to prevent or significantly reduce the serious consequences and losses resulting from a leaky excavation shoring. The paper presents the first in Poland case of the thermal detection of leaks in the excavation shoring at a construction site. This method has proven very effective in solving this complicated problem. The leaks were many and occurred in the diaphragm wall as well as under its lower edge. The depth of their occurrence reached over forty meters. The substrate‘s geology was highly heterogeneous. The method produced accurate details about the locations and intensity of the leaks.
Highlights
Numerous structures, especially buildings, are erected with deeply founded underground parts, in intensely urbanised agglomeration-like areas
Especially buildings, are erected with deeply founded underground parts, in intensely urbanised agglomeration-like areas. These underground parts foundations and structural elements are set in deep excavations very often below the groundwater level
The only method currently available for early and precise leak detection in the shoring of planned excavation made with diaphragm walls, sheet pile walls, or DSM walls, before this deep excavation execution is the thermal method
Summary
Especially buildings, are erected with deeply founded underground parts, in intensely urbanised agglomeration-like areas. The only method currently available for early and precise leak detection in the shoring of planned excavation made with diaphragm walls, sheet pile walls, or DSM walls, before this deep excavation execution is the thermal method. It detects zones of intense water flow in the ground, inside the future excavation's contour and in its surroundings alike. A detailed description of the thermal method's origins, development and current status, including the leak detection in deep excavations, is presented in [4] It presents the leakage and erosion processes development scenarios and patterns for deep excavations and discusses the relations between heat transport and the filtration and erosion processes.
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