Method for testing dynamic characteristics of pile foundation of nuclear power plant by adopting underground explosion means

Abstract

The invention relates to a method for testing dynamic characteristics of a pile foundation of a nuclear power plant by adopting an underground explosion means, which belongs to the technical field of civil engineering structures of nuclear power plants and comprises the following steps: S1, acquiring geological exploration data, and establishing a fine stratified soil model and a simplified stratified soil model; s2, calculating the maximum speed of each soil layer in the fine stratified soil model by taking an actual engineering earthquake as input; s3, calculating the vibration speed of each soil layer in the simplified soil layer model; s4, determining the explosive dosage, arrangement and detonation sequence; s5, determining arrangement of test piles; s6, determining the form of the test pile and the types and positions of an upper counterweight and a built-in sensor; s7, site construction is conducted, explosives are buried in a drilled hole, and a test pile is manufactured; and S8, starting the explosive, measuring the reaction of the test pile, and obtaining the dynamic characteristics of the test pile. According to the method provided by the invention, the propagation mode of seismic waves from bottom to top and the process of transmitting the seismic waves from soil to the pile body can be simulated, so that the dynamic characteristics of the pile foundation of the nuclear power plant in accordance with the actual seismic condition are obtained.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant civil structures, in particular to a method for testing the dynamic characteristics of nuclear power plant pile foundations by means of underground explosion. Background technique [0002] Nuclear power plants have high requirements for anti-seismic fortification. my country's nuclear power plants are generally located on hard bedrock, generally using flat raft foundations, coupled with the need for water cooling and the need to be close to economically developed areas, and are generally selected as coastal sites. As a result, suitable nuclear power plant sites are scarce. With the further development of nuclear power plant construction and the need for nuclear power to go global, nuclear power plants may be located on non-bedrock or even soft soil foundations. Pile foundations, which are deep foundations suitable for weaker ground, need to be applied. [0003] In terms of earthquake ...

AI Technical Summary

Problems solved by technology

These methods have many deficiencies in obtaining the dynamic characteristics of pile foundations that the nuclear power industry is more concerned about: First, because only the pile head exposed to the surface is subjected to force or vibration, only the upper part of the pile responds, and the characteristics of the pile-soil interaction in the lower part It is difficult to obtain, and thus it is impossible to simulate the main characteristics of seismic waves propagating from bottom to top; second, the vibration is generated on the pile body and propagates into the soil body, rather than the seismic wave propagating from the soil body causing the pile foundation to vibrate; third, the above method The vibration generated is often small, and it is impossible to simulate the situation when the soil enters into strong nonlinearity and the pile foundation has a large displacement

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