Method of preventing galleries in high concrete dam from arching and preventing bottom plate from cracking

Abstract

The invention provides a method of preventing galleries in a high concrete dam from arching and preventing a bottom plate from cracking. The method comprises the steps that Step 1, the allowable tensile strength and a time-dependent process of the allowable tensile strength are determined; Step 2, the stress distribution and the yield region distribution of the gallery parts of the dam, and time-dependent rules of the stress distribution and the yield region distribution are acquired; Step 3, the ranges and depths of gallery arching and bottom plate concrete tensile stress, exceeding the allowable tensile strength, are acquired. Step 4, the position, depth and width of a prefabricated seam are determined; Step 5, the prefabricated seams are distributed, the stress distribution, the yield region distribution, and the time-dependent rules of the stress distribution and the yield region distribution after the prefabricated seams of the galleries parts of the dam are prefabricated are acquired; Step 6, whether an area exceeding the concrete allowable tensile strength exist is determined; and Step 7, the form of the final prefabricated seam is determined. Through the layout of the longitudinal prefabricated seams of the galleries, the cracking of the gallery concrete is avoided, and the working behavior of the dam is improved.

Description

technical field [0001] The invention relates to the field of concrete dam construction, in particular to a method for preventing cracking of the top arch and bottom plate of corridors in concrete dams. Background technique [0002] Concrete dams are one of the most important types of dams, widely distributed around the world, with a large number, and generally have a high dam height. Concrete dams play an important role in ensuring flood control safety, water supply safety, food safety, energy safety and ecological safety. Ensuring the safety of reservoir hydropower dams is extremely important to the country and the people. [0003] In concrete dams, especially high dams, in order to carry out foundation grouting, drainage, safety monitoring, inspection and maintenance, operation and dam traffic, etc., corridors are generally set up at different heights inside the dam, such as foundation grouting corridors , drainage corridors and traffic corridors, etc. At present, the hi...

AI Technical Summary

Problems solved by technology

The main reason for the cracks in the top arch and bottom plate of this corridor is that the self-weight pressure is too large, which makes the stress on the top and bottom of the opening part exceed the standard

[0005] Although longitudinal cracks in the top arch and floor of the corridor generally have little impact on structural safety, they still affect the local stress of the structure and reduce the durability of internal steel and concrete materials. In order to prevent cracks from developing deep and interpenetrating, it is necessary to carry out Chemical grouting treatment, resulting in time and economic waste, so it is necessary to take certain measures and methods to prevent the corridor from cracking

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