A method for determining the lofting parameters of squeeze sidewall construction

Abstract

The invention discloses a method for determining the lofting parameters of the extrusion side wall construction, which comprises the following steps: step 1, obtaining material parameters through a triaxial test; 2, establishing a finite element model according to that material parameter obtained in the step 1; 3, performing layered fill solution through that model established in the step 2; 4, obtaining deformation parameters of that extrude side wall at different construction heights and section positions; 5, according to the parameters obtained in the step 4, reserving deformation margin ofthe squeezed side wall during the construction period, and determining actual lofting parameters. The invention determines reasonable extrusion sidewall construction lofting parameters before use, and the treatment method is simple and reliable.

Description

technical field [0001] The invention relates to a numerical simulation method, in particular to a method for determining lofting parameters in extrusion side wall construction. Background technique [0002] In the construction of face sand gravel-rockfill dam project, extrusion side wall technology has been developed rapidly and widely used as a new construction technology; after adopting extrusion side wall technology, the concrete face is in direct contact with the extrusion side wall, and the pad The layer materials are different, and the extrusion of the side wall will produce a certain rigid constraint on the panel; if the deformation of the two is not coordinated, the panel will be voided, and in severe cases, it may cause cracking of the panel and endanger the safety of the dam; at the same time, extrusion of the side wall during construction The deformation of the dam body continues to accumulate as the filling rises. If the extruded side wall is constructed accordin...

AI Technical Summary

Problems solved by technology

However, Shuibuya, Gongboxia and other face sand and gravel dams have serious cracks in the face during the construction period; existing treatment methods such as the "concrete extrusion side wall chiseling method of face dams" invented by the Yellow River Survey Planning and Design Co., Ltd. "(CN2014101522047); By cutting off two-stage trapezoidal grooves on the extruded side wall and backfilling the cushion material, the stress-strain state of the face plate can be improved; "a concrete face rockfill dam" invented by East China Survey and Design Research Institute Co., Ltd. (CN2014205260867), using a similar method to dig out trapezoidal grooves on the extruded side walls and backfill the surface of the cushion material to smear mortar and other methods; Guiyang Survey and Design Research Institute Co., Ltd. invented "a concrete panel to prevent panel voiding Dam upstream surface structure and construction method" (CN2014107633594); by opening several grooves in the extruded side wall, and burying backfill grouting pipes in the grooves, grouting the potential empty panels; Nanjing Institute of Hydraulic Sciences invented " Airbag-type automatic protection device and design method for rockfill dam face voiding (CN2017101420066), when the voiding of the face plate exceeds the safe value, the protection device is automatically activated to support the face plate to improve the unfavorable stress-strain state; now Some processing methods are mainly through certain processing of the extruded side walls that have been constructed, such as cutting off, opening trenches, arranging backfill grouting pipes, arranging protection devices, etc.; the processing methods have complex structures, many processes, and influence The construction period and fraud are relatively high, and the additional workload is increased, which is not easy to construct and may bring potential additional risks

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