Mounting method of pore water manometer in soft foundation zone
A technology of pore water pressure and installation method, which is applied in the field of foundation soil survey, basic structure engineering, construction, etc., and can solve the problem that pore water pressure gauges are easily damaged, affect the stability of roadbeds and slopes, and cannot obtain monitoring data, etc. question
Active Publication Date: 2019-01-11
CHINA MCC20 GRP CORP
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Problems solved by technology
[0003] Generally, pore water pressure gauges are mostly installed by laying pipes or directly burying and backfilling them. For soft ground areas, if conventional installation methods are used, the pore water pressure gauges are very easy to be damaged, and effective monitoring data is often not obtained, which affects the Judgment of roadbed and slope stability
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[0021] Example figure 1 and figure 2 As shown, the installation method of the pore water pressure gauge in the soft ground area of the present invention comprises the following steps:
[0022] Step 1: Use a standard penetration test to detect the position and depth of the soft soil layer 2 at the position where the pore water pressure gauge 1 is installed, and the pore water pressure gauge 1 needs to be placed in the middle of the soft soil layer 2;
[0023] Step 2: Drill holes by means of water flushing drilling, and put the sleeve 3 with a PVC cover 31 at the bottom to form a hole, and the drilling depth is 1m greater than the bottom depth of the pore water pressure gauge 1;
[0024] Step 3: Clean the inside of the sleeve 3 with water and use a water pump to drain the accumulated water in the sleeve 3, insert a high-pressure water pipe into the bottom of the sleeve 3, and pour cement mortar 4 into the bottom of the sleeve 3 through the high-pressure water pipe with a thi...
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The invention discloses a mounting method of a pore water manometer in a soft foundation zone. The mounting method comprises the steps that the position and depth of a soft soil layer are detected firstly, drilling is conducted, a sleeve is put to form a hole, the interior of the sleeve is cleaned with water, accumulated water is pumped out, and cement mortar is poured to the bottom of the sleevethrough a high-pressure water pipe; the bottom of the pore water manometer is fixed through a pipe cap, the top end of the pore water manometer is connected with a variable-diameter joint, the variable-diameter joint is connected with a PVC pipe, a plurality of small holes are drilled in the circumference surface of the pore water manometer and wrapped with nonwoven geotextile, the pore water manometer is put into the middle of the soft soil layer along the sleeve, and the PVC pipe stretches out of the ground; the sleeve is filled with rubble to the depth of the soft soil layer, and a rubber plug is plugged in the top face of the rubble, then the top of the sleeve is filled with cement mortar, and the PVC pipe exposed out of the ground is covered; and the sleeve is taken out, a concrete protecting device is placed on the top face, and thus mounting of the pore water manometer is completed. According to the mounting method of the pore water manometer in the soft foundation zone, the fault rate of the pore water manometer is effectively decreased, the accuracy of monitored data is improved, and thus the effect of soft foundation treatment and the stability of a roadbed are accuratelyevaluated.
Description
technical field [0001] The invention relates to an installation method of a pore water pressure gauge in a soft ground area. Background technique [0002] Pore pressure gauges are mainly used in groundwater pressure monitoring in engineering fields such as landslides, water conservancy dams, foundation pits, reservoirs, roadbeds, soft foundations, and ports. During expressway construction, when crossing soft ground areas such as swamps, most of the roadbed sections are located in deep peat soil areas, and the peat soil thickness in some sections exceeds 10m. Therefore, a large number of water pressure gauges need to be installed to ensure the safety of roadbeds and slopes Monitoring is carried out to evaluate the effect of soft foundation treatment, the stability of roadbed, etc. [0003] Generally, pore water pressure gauges are mostly installed by laying pipes or directly burying and backfilling them. For soft ground areas, if conventional installation methods are used,...
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IPC IPC(8): E02D1/02
CPCE02D1/027
Inventor 朱松马国志崔松明张智博唐春乐
Owner CHINA MCC20 GRP CORP