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Measuring method for monitoring soil mass layered settlement

A technology of soil stratification and measurement method, which is applied in the field of foundation soil survey, construction, infrastructure engineering, etc. Effect

Active Publication Date: 2013-10-23
深圳市城安物联科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The magnetic ring type layered sedimentation instrument measurement method currently used, when the sensor head is close to the magnetic ring and sounds an alarm, there will be a corresponding lag in the time of human judgment to stop the lowering of the sensor head, resulting in a certain reading error; at the same time, manual reading Taking the tape reading at the mouth of the settlement tube will also cause artificial reading errors, so this measurement method is not suitable for engineering projects that require high precision in settlement monitoring
In addition, this measurement method requires manual measurement of each measurement point on a regular basis, the measurement workload is large, and it does not have the characteristics of real-time monitoring, and its monitoring effect has a serious lag

Method used

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  • Measuring method for monitoring soil mass layered settlement

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment 1, a kind of measurement method of monitoring soil subsidence, drill holes on the foundation to be measured, the holes drilled are generally deeper than the installation depth, and its principle is 10 meters + 0.5 meters, 20 meters + 1 meter , and so on. After drilling to a predetermined depth, use clean water to change the slurry, and lift the drill after changing the slurry to form the required measurement hole 3 . Then backfill 20-40cm thick cement mortar to the bottom of the measuring hole 3, preferably 30cm thick cement mortar, then put the settlement tube 1 with the bottom end closed into the measuring hole 3, and insert the bottom end into the cement mortar for settlement The bottom end of pipe 1 is closed to prevent mud and sand from clogging. When the settling tube 1 is installed, if the buoyancy of the tube is too large, clear water can be injected into the settling tube 1 while the tube is lowered.

[0014] The settling tube 1 is provided with se...

Embodiment 2

[0019] Embodiment 2, with reference to figure 2 , in the measurement method of monitoring soil layer settlement described in embodiment 1, described fiber grating displacement gauge 7 comprises fiber grating displacement gauge body 11 and pull rod 10, and fiber grating displacement gauge body 11 is fixed on the settlement measuring tube 6 At the top, the lower end of the fiber grating displacement gauge body 11 is provided with a sleeve 8 set outside the pull rod 10, the pull rod 10 slides in the sleeve 8, and the inner wall of the sleeve is provided with two upper and lower annular grooves that cooperate with the pull rod 10. A corrosion-resistant O-ring 9 is installed in the groove, which can prevent the corrosive liquid from slipping through the pull rod 10 from entering the interior of the displacement gauge to corrode the grating.

Embodiment 3

[0020] Embodiment 3. In the measurement method for monitoring soil stratified settlement described in Embodiments 1 and 2, anti-corrosion coatings are provided on the outer surfaces of the fiber grating displacement gauge body 11 and the pull rod 10 . Some positions of the fiber grating displacement gauge 7 should be sealed with glass glue.

[0021] The present invention uses the current advanced fiber grating sensing technology, has strong measurement anti-interference ability, high measurement accuracy (measurement accuracy can reach 0.03mm), high data acquisition frequency (acquisition frequency can reach up to 100 Hz), and reduces manual measurement to the greatest extent Operation, reduce the error caused by human operation, and easy to realize automatic monitoring and safety early warning.

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Abstract

The invention provides a measuring method for monitoring soil mass layered settlement. A measuring hole is drilled in a foundation; then, the bottom of the measuring hole is backfilled with cement mortar; a settling pipe is placed in the middle of the measuring hole, and the bottom end of the settling pipe is inserted in the cement mortar; the distance between an outer circle of a settling ring and the wall of the measuring hole is larger than 2cm; then, a fiber bragg grating optical cable is used for connecting a fiber bragg grating displacement meter with a fiber bragg grating demodulation instrument; a gap between the measuring hole and the settling pipe is backfilled slowly, and the soil mass layered settlement can be measured after the gap is filled up; in the process of soil mass settlement, the settling ring on a settlement measuring pipe settles along with soil mass and pulls a pull rod on the lower portion of the fiber bragg grating displacement meter through a cross bar, therefore, a settlement signal is transmitted to the fiber bragg grating demodulation instrument through the fiber bragg grating optical cable, and the accurate value of the soil mass settlement is measured through the fiber bragg grating demodulation instrument.

Description

technical field [0001] The invention relates to a measurement method for monitoring layered settlement of soil bodies, in particular to a measurement method for monitoring layered settlement of soil bodies by using optical fiber gratings to monitor building foundations such as dam foundation soil and dredging fill soil. Background technique [0002] The foundation soil of reservoir dams, artificial island walls and other projects built on soft soil foundations such as dredger fill usually undergoes large settlement under the action of building loads, and there are generally problems such as long settlement process and uneven settlement , has a greater impact on the safety and stability of various engineering structures. Therefore, it is of great significance to monitor the settlement of engineering structure foundation soil, especially the layered settlement characteristics. At present, the method of monitoring the layered settlement of the foundation soil is mainly to use ...

Claims

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Application Information

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IPC IPC(8): E02D1/08
Inventor 张振东宗钟凌蒋德稳纪丹
Owner 深圳市城安物联科技有限公司
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