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Control method for open caisson back soil deformation caused by pipe-jacking construction
The invention provides a control method for open caisson back soil deformation caused by pipe-jacking construction and belongs to the technical field of construction. The control method for open caisson back soil deformation caused by pipe-jacking construction comprises the steps that firstly, well point dewatering is executed on the periphery of an open caisson, the underground water level is lowered to be below the bottom face of the open caisson, and therefore the friction force between the wall and the bottom face of the open caisson and a soil layer is increased; anchorage of the bottom of the open caisson in the soil layer is reinforced, the overall rigidness of the open caisson is brought into play, and the space deformation harmony of the open caisson under the action of jacking force is improved; a jacking sequence is determined, and two parallel jacking pipes are used for simultaneous jacking; simplified three-dimensional finite element models of the open caisson and the back soil of the open caisson are established, and the most unfavorable combination value [Vi, Vj] of the jacking force of the two parallel jacking pipes is determined through a stability analysis method and used as the jacking force pre-control parameter of jacking construction; in jacking construction, a small duct advanced slip casting technology is adopted, a thixotropic fluid sleeve with good performance is formed between the outer walls of the jacking pipes and the soil layer, the functions of reducing friction and lowering resistance are achieved, and therefore the disturbance influence of the jacking force on the back soil is reduced; finally, according to the preset jacking sequence of the parallel jacking pipes, a monitoring scheme is made in a targeted mode, monitoring point arrangement and monitoring are conducted before jacking construction is conducted, a test instrument is installed in the back soil, information is fed back in time, and therefore construction parameters can be adjusted.
Control method for open caisson back soil deformation caused by pipe-jacking construction
The invention provides a control method for open caisson back soil deformation caused by pipe-jacking construction and belongs to the technical field of construction. The control method for open caisson back soil deformation caused by pipe-jacking construction comprises the steps that firstly, well point dewatering is executed on the periphery of an open caisson, the underground water level is lowered to be below the bottom face of the open caisson, and therefore the friction force between the wall and the bottom face of the open caisson and a soil layer is increased; anchorage of the bottom of the open caisson in the soil layer is reinforced, the overall rigidness of the open caisson is brought into play, and the space deformation harmony of the open caisson under the action of jacking force is improved; a jacking sequence is determined, and two parallel jacking pipes are used for simultaneous jacking; simplified three-dimensional finite element models of the open caisson and the back soil of the open caisson are established, and the most unfavorable combination value [Vi, Vj] of the jacking force of the two parallel jacking pipes is determined through a stability analysis method and used as the jacking force pre-control parameter of jacking construction; in jacking construction, a small duct advanced slip casting technology is adopted, a thixotropic fluid sleeve with good performance is formed between the outer walls of the jacking pipes and the soil layer, the functions of reducing friction and lowering resistance are achieved, and therefore the disturbance influence of the jacking force on the back soil is reduced; finally, according to the preset jacking sequence of the parallel jacking pipes, a monitoring scheme is made in a targeted mode, monitoring point arrangement and monitoring are conducted before jacking construction is conducted, a test instrument is installed in the back soil, information is fed back in time, and therefore construction parameters can be adjusted.
Control method for open caisson back soil deformation caused by pipe-jacking construction
FAN YAWEN (author) / ZHENG SHIBAO (author) / SUN YANG (author)
2015-09-30
Patent
Electronic Resource
English
IPC:
E02D
FOUNDATIONS
,
Gründungen
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