CN108981657B - Monitoring and analyzing method for peat soil soft soil roadbed settlement - Google Patents
Monitoring and analyzing method for peat soil soft soil roadbed settlement Download PDFInfo
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- CN108981657B CN108981657B CN201810743328.0A CN201810743328A CN108981657B CN 108981657 B CN108981657 B CN 108981657B CN 201810743328 A CN201810743328 A CN 201810743328A CN 108981657 B CN108981657 B CN 108981657B
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Abstract
The invention provides a method for monitoring and analyzing peat soil soft soil subgrade settlement, which comprises the following steps: step a: collecting settlement data of the roadbed by installing roadbed settlement observation equipment; step b: and analyzing the stability of the roadbed according to the relation between the settlement data and the monitoring time. The invention provides a method for monitoring and analyzing the settlement of a peat soil soft soil subgrade, which monitors subgrade settlement data by installing settlement plates and displacement piles in the subgrade, determines the frequency of monitoring the subgrade according to the settlement data of the subgrade, and analyzes the stability of the subgrade by utilizing the relationship between the settlement data and the subgrade detection frequency; the water pressure meter is arranged in the roadbed to monitor pore water pressure data in the roadbed, so that the stability of the roadbed is analyzed by utilizing the relation among settlement data, the pore water pressure data and detection frequency, the construction efficiency is improved, and the roadbed construction quality is improved.
Description
Technical Field
The invention relates to the technical field of roadbed engineering, in particular to a method for monitoring and analyzing settlement of a peat soil soft soil roadbed.
Background
At present, with the rapid development of social economy, the progress of urban construction and industrial construction in China is accelerated continuously, and it is necessary to strengthen the detection of the roadbed in order to ensure the stable and safe transportation. In road traffic construction engineering, the road bed is the part of infrastructure, and the construction quality of whole engineering is decided to a great extent moreover, and after holistic construction is accomplished, construction unit needs in time to the road matrix volume detect, in case find the problem, should in time reform transform the road bed, general road bed settlement monitoring method has: the cross section testing method and the layered settlement monitoring method are only suitable for filling of general roadbeds; however, for the peat soil soft soil foundation conditions, the geological conditions are complex, the settlement change is large, and an effective roadbed settlement observation method is not available.
Disclosure of Invention
In view of the above, the invention provides a method for monitoring and analyzing the settlement of a peat soil soft soil roadbed, aiming at effectively analyzing the stability of roadbed filling and improving the roadbed construction quality.
In one aspect, the invention provides a method for monitoring and analyzing peat soil soft soil subgrade settlement, which comprises the following steps: step a: collecting settlement data of the roadbed by installing roadbed settlement observation equipment; step b: and analyzing the stability of the roadbed according to the relation between the settlement data and the monitoring time.
Further, in the method for monitoring and analyzing the settlement of the peat soil soft soil subgrade, in the step a, the monitoring frequency of the subgrade settlement observation equipment is determined according to the settlement data.
Further, in the above method for monitoring and analyzing the settlement of the peat soil soft soil subgrade, in step a, the subgrade settlement observation device includes: the hydraulic pressure gauge, displacement stake, subside board and subside the nail.
Further, in the method for monitoring and analyzing the settlement of the peat soil soft soil subgrade, the method for installing the subgrade settlement observation device further comprises the following substeps: step a 1: arranging the settlement plates and the settlement observation equipment in the roadbed at intervals along the vertical direction; step a 2: installing the displacement piles below the original ground on two sides of the roadbed; step a 3: the settlement nails penetrate through the asphalt adhesive layer of the pavement.
Further, in the method for monitoring and analyzing the settlement of the peat soil soft soil roadbed, the settlement plate comprises an extension piece, a bottom plate and a fixing piece; wherein the extension member is mounted on the base plate through the fixing plate so as to measure a descending distance of the settlement plate; a protection tube is mounted on the outer side of the extending piece and used for protecting the extending piece.
Further, in the method for monitoring and analyzing the settlement of the peat soil soft soil roadbed, the top of the extension piece is at least 500mm higher than the ground.
Further, in the method for monitoring and analyzing the settlement of the peat soil soft soil roadbed, the method for analyzing the settlement of the peat soil soft soil roadbed in the step b comprises the following steps: asaoka sedimentation analysis method, hyperbolic analysis method, Matsuo stability analysis method, and Matsuo Kawamura analysis method.
Further, in the method for monitoring and analyzing the settlement of the peat soil soft soil roadbed, the roadbed settlement monitoring equipment continuously collects the settlement data.
Further, in the method for monitoring and analyzing the settlement of the peat soil soft soil roadbed, the vulnerable area of the roadbed settlement monitoring equipment is protected by adopting a warning belt and a surrounding block.
Compared with the prior art, the method for monitoring and analyzing the settlement of the peat soil soft soil subgrade provided by the invention monitors the settlement data of the subgrade by installing the settlement plates and the displacement piles in the subgrade, and determines the frequency of monitoring the subgrade according to the settlement data of the subgrade, so that the stability of the subgrade is analyzed by utilizing the relationship between the settlement data and the detection frequency of the subgrade; the water pressure meter is arranged in the roadbed to monitor pore water pressure data in the roadbed, so that the stability of the roadbed is analyzed by utilizing the relation among settlement data, the pore water pressure data and detection frequency, the construction efficiency is improved, and the roadbed construction quality is improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a method for monitoring and analyzing peat soil soft soil subgrade settlement provided by an embodiment of the present invention;
FIG. 2 is a graph of Asaoka sedimentation analysis provided by an embodiment of the invention;
FIG. 3 is a hyperbolic analysis graph provided by an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the method for monitoring and analyzing the peat soil soft soil subgrade settlement provided by the embodiment of the invention comprises the following steps:
step S1: and collecting settlement data of the roadbed by installing roadbed settlement observation equipment.
Specifically, the method comprises the steps of monitoring subgrade settlement data by installing settlement plates, displacement piles and settlement nails in a subgrade, determining monitoring frequency of the subgrade through the subgrade settlement data, and monitoring pore water pressure data inside the subgrade by installing a water pressure gauge in the subgrade.
The above-mentioned settlement plate includes: the extension piece is arranged on the bottom plate through the fixing plate so as to measure the descending distance of the sedimentation plate; the protection tube is installed in the outside of extension for the protection extension, preferably, the model of the outside protection tube of extension is the PVC protection tube, should keep in the same direction as straight when the extension is installed, and the top of extension should be higher than former ground by at least 500mm, and the bottom plate is fixed and is installed smoothly, and the settlement plate increases along with the extension of road bed filling gradually, makes the record to the elevation of initial settlement plate.
The embedded depth of the displacement pile needs to be determined according to geological conditions, the embedded depth of the displacement pile on the original ground is 1500mm and 500mm higher than the original ground, the general displacement pile is made of wood materials, and preferably the displacement pile is 10 x 10 square timber.
The settlement nails are installed immediately after the construction of the asphalt adhesive layer on the road surface, preferably, the settlement nails are made of cement, the cement nails are low in price, and the settlement nails are more convenient to process.
The water pressure meter adopts a vertical tube type water pressure meter, and the vertical tube type water pressure meter comprises a filter tip and a lifting tube; the filter tip and the riser are installed inside the roadbed in a combined mode, the sea sand filter layer is filled around the filter tip, water in the pores inside the roadbed enters the riser through the sea sand filter layer, the water level of the riser is high and is the pressure of the water in the pores inside the roadbed, and the water level data of the riser is detected by the water pressure monitor.
As shown in fig. 2, the distribution states of the settlement plates, the settlement nails, the water pressure meters and the displacement piles in the roadbed are as follows: the settlement plates and the hydrostatic meters are distributed in the roadbed at intervals, the settlement plates are arranged below the original ground on two sides of the roadbed respectively, the settlement plates, the settlement nails, the hydrostatic meters and the displacement piles are installed in a pre-buried mode after soft foundation treatment and broken stone cushion treatment are finished, soil is filled around the settlement equipment, and small flat plates are used for compaction.
The concrete process of the roadbed filling comprises the steps of constructing a broken stone cushion layer, then installing roadbed observation equipment, carrying out primary observation and recording on the roadbed by utilizing the roadbed observation equipment to collect data, analyzing the settlement and stability of the roadbed through the data, determining the filling rate of the roadbed by utilizing the settlement observation data, filling the next layer of the roadbed when the filling rate is not more than 0.5m, then evaluating the settlement and stability of the roadbed, stopping the filling of the roadbed immediately when the settlement and stability rechecking of the roadbed do not meet the requirements, and adopting a necessary treatment scheme; when the settlement and stability recheck of the roadbed meet the requirements, checking whether the filling thickness of each layer of the roadbed can meet the requirements, when the filling thickness of each layer of the roadbed can not meet the requirements, continuously filling each layer of the roadbed, when the filling thickness of each layer of the roadbed can meet the requirements, installing roadbed settlement observation equipment again, pre-pressing the roadbed, observing the settlement of the roadbed by using the settlement observation equipment and detecting the pre-pressing height, when the settlement cannot meet the design requirements, filling extra soil layers in the roadbed and installing the settlement observation equipment, when the settlement equipment can meet the design requirements, protecting the settlement equipment and observing whether the expected settlement meets the requirements; and if the expected settlement does not meet the requirement, continuing loading the settlement observation equipment and filling the roadbed, if the expected settlement can meet the expected requirement, unloading the settlement equipment, constructing the pavement, installing the settlement nails and then entering a defect duty period.
And determining the monitoring frequency of the roadbed through the data of roadbed settlement. Specifically, when the roadbed is not constructed, the settlement rate of the settlement plate is less than 20mm every week, the settlement rate of the displacement pile is less than 20mm every week, and the hydraulic pressure meter is in a stable state, the roadbed is monitored once every two weeks; when the roadbed is under construction, the settlement rate of the settlement plates is less than 20mm every week, the settlement rate of the displacement piles is less than 20mm every week, the water pressure of gaps at the previous position is high, and the roadbed is monitored once every week; when the roadbed is under construction, the settlement rate of the settlement plates is greater than 20mm every week, and the settlement rate of the displacement piles is greater than 20mm every week, and the roadbed is monitored once every three days; when the position of a certain section of the roadbed is determined as an important section, the roadbed is monitored once a day.
Step S2: and analyzing the stability of the roadbed according to the relation between the settlement data and the monitoring time.
Specifically, the observation method of the subgrade settlement rate comprises the following steps: asaoka sedimentation analysis method, hyperbolic analysis method, Matsuo stability analysis method, and Matsuo Kawamura analysis method.
The Asaoka settlement analysis method is an equivalent table drawn by actual measurement time of settlement equipment and a subgrade settlement curve, as shown in figure 3, the abscissa is time, the ordinate is a subgrade settlement value, observation time is divided into a plurality of equal time intervals, each person time interval corresponds to a different settlement value, the Asaoka settlement analysis method is a calculation mode of subgrade settlement, systematic observation is carried out on the subgrade settlement in the construction process, and basis is provided for construction quality.
A hyperbolic analysis method is a table drawn by actual measurement time of settlement equipment and a subgrade settlement curve, the abscissa is time, the ordinate is subgrade settlement per second, and when the time approaches infinity, the reciprocal of the slope of a linear section can give a final settlement.
The Matsuo stability analysis method is used for analyzing the stability of the roadbed. The method specifically comprises the following steps: step S21: drawing a settlement curve at the center of the roadbed and a latest displacement settlement rate curve at the center of the roadbed; step S22: observing the development trend direction of the curve, and stopping roadbed filling when the trend line exceeds a damage line by 1.25; step S23: if the settlement displacement of the roadbed is less than 3.5mm per day, the roadbed is stable, and the roadbed filling can be continuously constructed; step S24: if the subgrade settlement displacement exceeds 4mm every day but does not exceed 5mm every day, subgrade filling needs to be stopped immediately, the observation frequency needs to be once every day, and the corresponding construction progress needs to be slowed down. Meanwhile, whether construction is carried out or not is determined according to a Matsuo Kawamura analysis method, and monitoring data of the water pressure of the ultra-pore space are also used for analysis; step S25: if the latest displacement exceeds 5mm every day, roadbed filling needs to be stopped immediately, the observation frequency needs to be once every day, whether construction is carried out or not needs to be determined according to a Matsuo Kawamura analysis method, the monitoring data of the ultra-pore water pressure is also used for analysis, if the original ground is fluctuated or the roadbed is observed to have cracks, stability measures need to be taken, and settlement observation needs to be carried out continuously so as to be convenient for confirming that the settlement quantity meets the construction technical requirements in the defect responsibility period.
Compared with the prior art, the method for monitoring and analyzing the settlement of the peat soil soft soil subgrade provided by the invention monitors the settlement data of the subgrade by installing the settlement plates and the displacement piles in the subgrade, and determines the frequency of monitoring the subgrade according to the settlement data of the subgrade, so that the stability of the subgrade is analyzed by utilizing the relationship between the settlement data and the detection frequency of the subgrade; the water pressure meter is arranged in the roadbed to monitor pore water pressure data in the roadbed, so that the stability of the roadbed is analyzed by utilizing the relation among settlement data, the pore water pressure data and detection frequency, the construction efficiency is improved, and the roadbed construction quality is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A monitoring and analyzing method for peat soil soft soil subgrade settlement is characterized by comprising the following steps:
step a: collecting settlement data of a roadbed by installing roadbed settlement observation equipment, the roadbed settlement observation equipment comprising: the device comprises water pressure meters, displacement piles, settlement plates and settlement nails, wherein the settlement plates and the water pressure meters are distributed in the roadbed at intervals, the displacement piles are arranged below the original ground on the two sides of the roadbed to construct a broken stone cushion layer, then roadbed settlement observation equipment is arranged, the roadbed settlement observation equipment is used for carrying out primary observation and recording on the roadbed so as to collect data, the settlement and stability of the roadbed are analyzed through the data, the data are used for determining the filling rate of the roadbed, then the next layer of the roadbed is filled, then the settlement and stability of the roadbed are evaluated, and when the settlement and stability rechecking of the roadbed do not meet the requirements, the filling of the roadbed needs to be stopped immediately; when the settlement and stability rechecking of the roadbed meet the requirements, checking whether the filling thickness of each layer of the roadbed can meet the requirements, when the filling thickness of each layer of the roadbed can not meet the requirements, continuously filling each layer of the roadbed, when the filling thickness of each layer of the roadbed can meet the requirements, installing the roadbed settlement observation equipment again, pre-pressing the roadbed, observing the settlement of the roadbed by using the roadbed settlement observation equipment and detecting the pre-pressing height, when the settlement cannot meet the design requirements, filling additional soil layers in the roadbed and installing the roadbed settlement observation equipment, when the settlement can meet the design requirements, protecting the roadbed settlement observation equipment and observing whether the expected settlement meets the requirements; when the roadbed is not constructed, the settlement rate of the settlement plates is less than 20mm every week, the settlement rate of the displacement piles is less than 20mm every week, and the hydraulic pressure meter is in a stable state, the roadbed is monitored once every two weeks; when the roadbed is under construction, the settlement rate of the settlement plates is less than 20mm every week, the settlement rate of the displacement piles is less than 20mm every week, the water pressure of gaps at the previous positions is high, and the roadbed is monitored once every week; when the roadbed is under construction, the settlement rate of the settlement plates is greater than 20mm every week, and the settlement rate of the displacement piles is greater than 20mm every week, and the roadbed is monitored once every three days; when the position of a certain section of the roadbed is determined as an important section, the roadbed is monitored once every day;
step b: and analyzing the stability of the roadbed according to the relation between the settlement data and the monitoring time.
2. The method according to claim 1, wherein in the step a, the monitoring frequency of the subgrade settlement observation device is determined according to the settlement data.
3. The method for monitoring and analyzing the settlement of the peat soil soft soil roadbed according to claim 1, wherein the method for installing the roadbed settlement observation equipment further comprises the following substeps:
step a 1: arranging the settlement plate and the water pressure meter in the roadbed along the vertical direction;
step a 2: installing the displacement piles below the original ground on two sides of the roadbed;
step a 3: the settlement nails penetrate through the asphalt adhesive layer of the pavement.
4. The method according to claim 3, wherein the settlement plate comprises an extension member, a bottom plate and a fixing plate; wherein the extension member is mounted on the bottom plate through the fixing plate so as to measure a descending distance of the settling plate; a protection tube is mounted on the outer side of the extending piece and used for protecting the extending piece.
5. A method of monitoring and analysing the settlement of a peat soil soft soil subgrade according to claim 4, characterised in that the top of the extension is at least 500mm above the ground.
6. The method for monitoring and analyzing the subsidence of the peat soil soft soil roadbed according to claim 1, wherein the method for analyzing the subsidence of the peat soil soft soil roadbed in the step b comprises the following steps: asaoka sedimentation analysis method, hyperbolic analysis method, Matsuo stability analysis method, and MatsuoKawamura analysis method.
7. The method for monitoring and analyzing peat soil soft soil subgrade settlement according to claim 3, wherein in the step a, the subgrade settlement observation equipment continuously collects the settlement data.
8. The method for monitoring and analyzing the settlement of the peat soil soft soil roadbed according to claim 3, wherein the area which is vulnerable to roadbed settlement observation equipment is protected by adopting a warning belt and a barrier.
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| CN201810743328.0A CN108981657B (en) | 2018-07-09 | 2018-07-09 | Monitoring and analyzing method for peat soil soft soil roadbed settlement |
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| CN112683233B (en) * | 2020-12-15 | 2021-10-26 | 温州鼎玛建筑技术有限公司 | Building settlement detection method |
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| CN103487022B (en) * | 2013-09-17 | 2015-12-23 | 河海大学 | A kind of Freeway Soft the Settlement Observation rope device |
| CN105354629A (en) * | 2015-10-20 | 2016-02-24 | 中冶交通建设集团有限公司 | Prediction system for roadbed settlement of expressway in soft soil area |
| CN205280057U (en) * | 2016-01-13 | 2016-06-01 | 曹云修 | Highway subgrade settlement observation device |
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