Real-time detection instrument and method for shield tunneling machine unearthing density

Abstract

The invention discloses a real-time detection instrument and method for shield tunneling machine unearthed density, the real-time detection instrument comprises a first terahertz source, a second terahertz source and a coherent detection system, the coherent detection system is provided with a reference road inlet and a detection road inlet, the reference road inlet is communicated with the transmitting end of the first terahertz source through a metal pipe, and the detection road inlet is communicated with the transmitting end of the second terahertz source through a metal pipe; terahertz waves emitted by the first terahertz source enter the reference path inlet through the metal tube; the detection path inlet is opposite to the transmitting end of the second terahertz source, the muck sample is placed between the detection path inlet and the second terahertz source, and terahertz waves transmitted by the second terahertz source penetrate through the muck sample and enter the detection path inlet; terahertz waves emitted by the first terahertz source and the second terahertz source interfere with each other in the coherent detection system, and corresponding level change conditions are displayed. The real-time detection instrument and method for the unearthed density of the shield tunneling machine are high in measurement speed and accurate, do not involve harmful and radioactive rays, and are safe to operators.

Description

technical field [0001] The invention relates to the technical field of shield machine unearthed density measurement, in particular to a real-time detection instrument and method for shield machine unearthed density. Background technique [0002] Real-time monitoring of the density unearthed by the shield machine is of great significance to effectively guarantee the safety of tunnel excavation operations. The amount of excavation is inversely proportional to the pressure of the excavation face, which directly affects the uplift and subsidence of the ground at the excavation site, and plays a decisive role in construction safety and efficiency. Mastering the density of muck can effectively estimate the excavation volume of shield machine tunneling construction, and has an important guiding role in the adjustment of shield machine tunneling parameters, tunneling efficiency, and safety. [0003] At present, there are mainly two types of methods for measuring the density of muck...

AI Technical Summary

Problems solved by technology

[0008] The method of obtaining density based on the ratio of mass to standard volume has some defects: 1. The measured object is required to be evenly distributed and have a standard volume; 2. The error of volume and mass measurement is large and difficult to reduce; 3. Due to the requirement of static readings The value of the density cannot be obtained quickly and in real time

However, these three types of products have the following defects: vibrating density meters need to rely on the principle that the change in vibration frequency is proportional to the square root of density change, so when the density change is small, the change in vibration frequency is also small, not Conducive to precise testing requirements

[0010] Radioisotope-type detectors mainly contain a radioactive source, which may cause harm to the human body

[0011] The ultrasonic shape detector carries a certain amount of energy, which may change the shape of the measured object, and the measured results will be distorted

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