Method for reinforcing rock-fill dam concrete face through ultra high toughness cementitious composites

Abstract

The invention discloses a method for reinforcing a rock-fill dam concrete face through ultra high toughness cementitious composites (UHTCC for short). The method comprises the steps that a three-dimensional finite element model of a concrete face rock-fill dam is built, and stress distribution of the concrete face under the design operation water level is calculated; on the basis of the finite element model calculation, an ultra high toughness cementitious composite reinforcing layer is added in the area where face concrete stress is larger than concrete cracking stress, the face concrete calculation stress is smaller than cracking stress by constantly adjusting the range and thickness of the reinforcing layer, and therefore the optimal reinforcing range and thickness of the ultra high toughness cementitious composites are determined; and after the reinforcing range of the face and the thickness of the reinforcing layer are calculated and determined, a jet technology is adopted for reinforcing the concrete face. The advanced calculation method and the jet reinforcing measure adopting the ultra high toughness cementitious composites are adopted, the cracking resistance of the composite face can be remarkably improved, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the fields of water conservancy engineering and new composite materials, and relates to a method for strengthening concrete panels of rockfill dams by using ultra-high toughness cement-based composite materials. Background technique [0002] Concrete face rockfill dam is a kind of dam type with rockfill body as supporting structure and concrete face as anti-seepage structure on its upstream face. The construction and development of concrete face rockfill dam has gone through more than a century. Since the 1990s, with the development of concrete dam technology, the dam height has been increasing, and a number of high concrete rockfill dam projects with a dam height greater than 150m have been designed and constructed at home and abroad. The number of face dams in my country accounts for more than 50% of the world, and the number of high concrete face rockfill dams accounts for about 60% of the world. High concrete face rockfill...

AI Technical Summary

Problems solved by technology

However, these existing methods have not changed the quasi-brittle material properties of concrete materials, that is, the ultimate tensile strain of concrete is very small, generally only 0.0001

Due to the quasi-brittleness of concrete, concrete panels and reinforcement materials can only bear small tensile stress and tensile strain. Therefore, the existing anti-cracking measures for concrete panels have limited improvement in crack resistance and fail to solve the problem of concrete-faced rockfill dams. panel cracking problem

Images