Soft foundation pore pressure meter embedding method

Abstract

The invention discloses a soft foundation pore pressure meter embedding method which comprises the steps that first, a drilling machine is used for drilling; second, a pore pressure meter placed at the lowest position is pressed into a hole, and the steps are that 1. a probe of the pore pressure meter is wrapped in a filter membrane sleeve where medium-coarse sand is placed, and the medium-coarse sand covers a water filtering stone of the probe; one end of a nylon rope is tied to the middle portion of the pore pressure meter, and the embedding depth position is marked on the nylon rope; 2. a drill pipe is taken out, a drill bit is detached, and a sleeve is refitted; 3. the pore pressure meter is inserted into the sleeve, and the nylon rope is used for upward tight lifting; 4. the drill pipe is put downwards, the pore pressure meter is pressed into the hole, and the nylon rope is fixed; and 5. the drill pipe is taken out, and the pore pressure meter is hung at the designed embedding depth position; third, the steps 1-5 are repeated by multiple times, and pressing in of all pore pressure meters is completed; and fourth, soft soil backfill is carried out, so that all the pore pressure meters placed at the designed embedding positions and soft soil around are compact. The poses of the pore pressure meters can be accurately guaranteed, and the smearing effect of the soft soil on the pore pressure meters can be lowered.

Description

technical field [0001] The invention relates to a method for embedding a piezometer, in particular to a method for embedding a piezometer on a soft foundation. Background technique [0002] In the soft ground monitoring project, it will encounter the problem of difficulty in embedding piezometers. The general requirement for the burial of piezometers in soft soil areas is to use direct pressing or drilling into soft soil. In the actual operation process, the direct press-in method cannot guarantee that the probe will maintain a vertical posture in the soil, and it will produce a smear effect on the surface of the probe. If the press-in method is used after drilling, touching the hole wall during the press-in process will also cause Smear effect, the probe will deviate from the designed embedding depth due to its own weight sinking to the bottom of the hole. According to practical experience, the above methods have poor stability and many unfavorable factors in the soft gro...

AI Technical Summary

Problems solved by technology

In the actual operation process, the direct press-in method cannot guarantee that the probe will maintain a vertical posture in the soil, and it will produce a smear effect on the surface of the probe. If the press-in method is used after drilling, touching the hole wall during the press-in process will also cause Smear effect, the probe will deviate from the designed embedding depth due to its own weight sinking to the bottom of the hole

According to practical experience, the above methods have poor stability and many unfavorable factors in the embedding of soft foundation piezometers. After embedding, the piezometer cannot accurately reflect the pore water pressure in the soil.

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