CN108645997A - A kind of controlling groundwater level monitoring subgrade settlement rule test model and test method - Google Patents

A kind of controlling groundwater level monitoring subgrade settlement rule test model and test method Download PDF

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Publication number
CN108645997A
CN108645997A CN201810452844.8A CN201810452844A CN108645997A CN 108645997 A CN108645997 A CN 108645997A CN 201810452844 A CN201810452844 A CN 201810452844A CN 108645997 A CN108645997 A CN 108645997A
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China
Prior art keywords
roadbed
level
reading
test
water
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CN201810452844.8A
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Chinese (zh)
Inventor
肖桂元
李知翰
叶子明
韦桐忠
江廷荟
史建飞
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Guilin University of Technology
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Guilin University of Technology
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Priority to CN201810452844.8A priority Critical patent/CN108645997A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24Earth materials

Abstract

The present invention relates to a kind of controlling groundwater levels to monitor subgrade settlement rule test model, including model, it is cavity structure in the model, the cavity structure is divided into two parts by a vertical partition panel, a part is vertical well, another part bottom is equipped with one layer of blotter, is equipped with above blotter and constructs identical red clay roadbed with half range highway subgrade, has water level control system outside vertical water well section mould walls.The present invention also discloses the test methods of the model.The present invention can analyze the settlement law of red clay under different levels of ground water, and rational technological borrowing and theoretical direction are provided for roadbed filling and repair.

Description

A kind of controlling groundwater level monitoring subgrade settlement rule test model and test method
Technical field
The present invention relates to a kind of brick or concrete duct, especially a kind of strength retrogression's subgrade deformation and variation of stress test mould Type and test method.
Background technology
China is that a monsoon climate is significantly national, and the season distribution of precipitation differs greatly, and precipitation in rain season accounts for about year 70% or so of total amount, general Used in Rainy Seasons of Southern Cities are the 4-9 months, and the north is the 6-9 months.In contrast dry season then drought, to make Decline at level of ground water, the soil body is caused to generate dry shrinkage and cracking, red clay is opened as a kind of its generation of the apparent soil body of shrinkage It splits destruction to become apparent from than general clay, destructive also bigger.It is carried out by early-stage study and to red clay area highway Live disease and geological condition investigation after find, moisture source is abundant, moisture changes place greatly and is susceptible to subgrade settlement Disease.This project is mainly carried out seasonal underground water and is analyzed the settlement influence of red clay roadbed.It is quick with high-speed railway Development and highway are continuously increased, and subgrade settlement caused by rainwater in the urgent need to address deforms disaster.
Invention content
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, provide red clay under a kind of different levels of ground water Settlement law test model and test method.
To achieve the above object, the present invention uses following technical proposals:
A kind of controlling groundwater level monitoring subgrade settlement rule test model, which is characterized in that including model, the mould It is cavity structure in type body, which is divided into two parts by a vertical partition panel, and a part is vertical well, another portion Point bottom is equipped with one layer of blotter, is equipped with above blotter and constructs identical red clay roadbed with half range highway subgrade, There is water level control system outside vertical water well section mould walls.
The slope gradient of the red clay roadbed is 1:1.5.
A kind of controlling groundwater level monitoring subgrade settlement rule test model test method, steps are as follows:
1) experiment roadbed fill and the installation of equipment and instrument with it is embedded;
2) acquisition of water level control and data is experimental field descended;
3) Data Management Analysis is carried out.
Experiment roadbed fills points 5 layers and fills in the step 1), includes the following steps:
A. first layer is blotter, filling-up thickness 10cm, smooth, one layer of upper berth geotextiles after having filled;
B. the second layer to layer 5 fills red clay, using electric shocking rammer compaction in layers, and detect every layer banket contain Water, density and compactness physical index;
C. simultaneously during roadbed filling, the different compacting passes to be banketed according to each layer pass through soil stiffness modulus test Instrument measures the elasticity modulus of compacted soil, establishes red clay compactness and the relationship of elasticity modulus.
The installation of equipment and instrument in the step 1) with it is embedded, be included in during roadbed filling and existed according to actual design The different location of roadbed buries detecting instrument, passes through the specific depth of measurement of the level Accurate Calibration instrument during detecting instrument is embedded Degree simultaneously, after the completion of roadbed filling, is arranged several displacement observation points in roadbed side slope middle section, is examined by steel ruler and spirit level Survey level and the vertical displacement of side slope.
Level of ground water control in the step 2) uses water level control system, specific level of ground water control and data to adopt Collection includes the following contents:
A. roadbed is created, after roadbed reaches final settlement after construction with controlling vertical well using level of ground water control system Lower water level is kept for the 20cm15 days time of level of ground water, then open discharge outlet and drained at distance model body bottom 20cm, is arranged 7 day time is kept after clean water, this is recycled for first time groundwater level, and during which acquisition, roadbed top surface and slope displacement are seen It is the elevation of measuring point, the horizontal displacement of slope displacement observation point to experimental tank, the reading of soil pressure cell, the reading of soil moisture meter, single The reading of horizontal displacement dial gauge, whole numbers in the reading of point sedimentometer, the reading of roadbed top surface dial gauge and monitoring side slope It is acquired according to computer reading mode is all made of;
B. the vertical well level of ground water of level of ground water control system control is reused after first time groundwater level cycle to exist At distance model body bottom 30cm, kept for the 30cm15 days time of level of ground water, then open discharge outlet and drained, drain water purification it 7 day time is kept afterwards, this is recycled for second of groundwater level, during which the height of acquisition, roadbed top surface and slope displacement observation point Journey, the horizontal displacement of slope displacement observation point to experimental tank, the reading of soil pressure cell, the reading of soil moisture meter, single-point sedimentometer Reading, the reading of roadbed top surface dial gauge and the reading of horizontal displacement dial gauge in monitoring side slope, total data is all made of Computer reading mode acquires;
Until off-test when groundwater level is recycled to distance model body bottom 80cm.
The cast material and size of the present invention
By consulting amount of literature data, due to the elasticity modulus very little of banketing of road engineering, it is difficult to according to elasticity modulus The similar material for finding replacement is often tried using undisturbed soil so in the large-scale relevant model test of road engineering It tests, so this experimental model is using the filler used in entity project.
Roadbed is banded structure object, and stress belongs to plane strain problems simultaneously, and common embankment is symmetric form, therefore Half range roadbed can be selected and carry out experimental study.This experimental model selects common road structure form and size (roadbed length 10m; Half range roadbed top surface width:8m;The depth of fill:8m;Slope gradient:1:1.5), according to 1:10 ratios, therefore, test model ruler It is very little to be:Roadbed length 1m;Half range roadbed top surface width:0.8m;The depth of fill:0.8m;Slope gradient:1:1.5.
Model roadbed is using red clay placement in layers and tamps;For simulated groundwater rise phenomenon, the ground of model roadbed The blotter of 10cm is filled in beginning first, passes through the SEA LEVEL VARIATION of vertical well, the fluctuation of simulated groundwater position, to realize The variation of model roadbed different height water content.
Compared with prior art, the beneficial effects of the invention are as follows,
According to test model, scheme and technique, the sedimentation rule of red clay roadbed under the influence of different levels of ground water can be analyzed Rule, and level of ground water height can be precisely controlled by water level control system, reinforcing repair for roadbed filling provides rational skill Art is used for reference and theoretical direction.
Description of the drawings
Fig. 1 is model road structure schematic diagram of the present invention;
Fig. 2 (a) is test equipment plane of arrangement figure;
Fig. 2 (b) is test equipment arrangement sectional view;
Wherein 1. models, 2. vertical baffles, 3. vertical wells, 4. blotters, 5. red clay roadbeds, 6. water level controls System.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, a kind of controlling groundwater level monitors subgrade settlement rule test model, including model 1, the mould 1 inside of type body is cavity structure, which is divided into two parts by a vertical baffle 2, and a part is vertical well 3, separately A part of bottom is equipped with one layer of blotter 4, and blotter 4 is equipped with red clay roadbed identical with half range subgrade structure above 5, model is equipped with water level control system 6 outside.The slope gradient of red clay roadbed 5 is 1:1.5.
By consulting amount of literature data, due to the elasticity modulus very little of banketing of road engineering, it is difficult to according to elasticity modulus The similar material for finding replacement is often tried using undisturbed soil so in the large-scale relevant model test of road engineering It tests, so this experimental model is using the filler used in entity project.
Roadbed is banded structure object, and stress belongs to plane strain problems simultaneously, and common embankment is symmetric form, therefore Half range roadbed can be selected and carry out experimental study.This experimental model selects common road structure form and size (roadbed length 10m; Half range roadbed top surface width:8m;The depth of fill:8m;Slope gradient:1:1.5), according to 1:10 ratios, therefore, test model ruler It is very little to be:Roadbed length 1m;Half range roadbed top surface width:0.8m;The depth of fill:0.8m;Slope gradient:1:1.5.
Model roadbed is using red clay placement in layers and tamps;For simulated groundwater rise phenomenon, the ground of model roadbed The blotter of 10cm is filled in beginning first, passes through the SEA LEVEL VARIATION of vertical well, the fluctuation of simulated groundwater position, to realize The variation of model roadbed different height water content.
Test apparatus is arranged and test content
Test apparatus arrangement is as shown in Fig. 2 (a), Fig. 2 (b).
Testing content includes:The distribution of roadbed vertical pressure, the variation of the vertical moisture content of roadbed, roadbed vertical displacement change Change, the vertical pore water pressure distribution of roadbed.
The distribution of roadbed vertical pressure is measured by ZLK-YLH soil pressure cells, and the variation of the vertical moisture content of roadbed passes through NHSF48AR soil moisture sensors measure, and the variation of roadbed vertical displacement is measured by dial gauge, the vertical pore water pressure of roadbed The distribution of power is measured by ZLK.KXYL pore pressure gauges.
It is as follows that controlling groundwater level monitors subgrade settlement rule test model test method:
One, experiment roadbed fill and the installation of equipment and instrument with it is embedded:
Filling points 5 layers and filling for experiment roadbed, includes the following steps:
A. first layer is blotter, filling-up thickness 10cm, smooth, one layer of upper berth geotextiles after having filled;
B. the second layer to layer 5 fills red clay, using electric shocking rammer compaction in layers, and detect every layer banket contain Water, density and compactness physical index;
C. simultaneously during roadbed filling, the different compacting passes to be banketed according to each layer pass through soil stiffness modulus test Instrument measures the elasticity modulus of compacted soil, establishes red clay compactness and the relationship of elasticity modulus.
The installation of equipment and instrument with it is embedded, be included in during roadbed filling according to actual design roadbed different location Embedded detecting instrument, during detecting instrument is embedded simultaneously by the specific depth of measurement of the level Accurate Calibration instrument, roadbed is filled out After the completion of building, several displacement observation points are set in roadbed side slope middle section, the level of side slope is detected by steel ruler and spirit level And vertical displacement.
Two, the acquisition of water level control and data is experimental field descended;
Level of ground water control uses water level control system, and specific level of ground water control and data acquisition include in following Hold:
A. roadbed is created, after roadbed reaches final settlement after construction with controlling vertical well using level of ground water control system Lower water level is kept for the 20cm15 days time of level of ground water, then open discharge outlet and drained at distance model body bottom 20cm, is arranged 7 day time is kept after clean water, this is recycled for first time groundwater level, and during which acquisition, roadbed top surface and slope displacement are seen It is the elevation of measuring point, the horizontal displacement of slope displacement observation point to experimental tank, the reading of soil pressure cell, the reading of soil moisture meter, single The reading of horizontal displacement dial gauge, whole numbers in the reading of point sedimentometer, the reading of roadbed top surface dial gauge and monitoring side slope It is acquired according to computer reading mode is all made of;
B. the vertical well level of ground water of level of ground water control system control is reused after first time groundwater level cycle to exist At distance model body bottom 30cm, kept for the 30cm15 days time of level of ground water, then open discharge outlet and drained, drain water purification it 7 day time is kept afterwards, this is recycled for second of groundwater level, during which the height of acquisition, roadbed top surface and slope displacement observation point Journey, the horizontal displacement of slope displacement observation point to experimental tank, the reading of soil pressure cell, the reading of soil moisture meter, single-point sedimentometer Reading, the reading of roadbed top surface dial gauge and the reading of horizontal displacement dial gauge in monitoring side slope, total data is all made of Computer reading mode acquires;Until off-test when groundwater level is recycled to distance model body bottom 80cm.
Three, Data Management Analysis is carried out.

Claims (6)

1. a kind of controlling groundwater level monitors subgrade settlement rule test model, which is characterized in that including model, the model It is cavity structure in vivo, which is divided into two parts by a vertical partition panel, and a part is vertical well, another part Bottom is equipped with one layer of blotter, is equipped with above blotter and constructs identical red clay roadbed with half range highway subgrade, erected There is water level control system to outside water well section mould walls.
2. model according to claim 1, which is characterized in that the slope gradient of the red clay roadbed is 1:1.5.
3. a kind of controlling groundwater level monitors subgrade settlement rule test model test method, which is characterized in that steps are as follows:
1) experiment roadbed fill and the installation of equipment and instrument with it is embedded;
2) acquisition of water level control and data is experimental field descended;
3) Data Management Analysis is carried out.
4. according to the method described in claim 3, it is characterized in that, experiment roadbed fills points 5 layers and fills in the step 1), Include the following steps:
A. first layer is blotter, filling-up thickness 10cm, smooth, one layer of upper berth geotextiles after having filled;
B. the second layer to layer 5 fills red clay, using electric shocking rammer compaction in layers, and detect every layer of water content banketed, Density and compactness physical index;
C. simultaneously during roadbed filling, the different compacting passes to be banketed according to each layer are surveyed by soil stiffness modulus test instrument The elasticity modulus for measuring compacted soil, establishes silt compactness and the relationship of elasticity modulus.
5. according to the method described in claim, which is characterized in that the installation of the equipment and instrument in the step 1) and embedded, packet It includes and detecting instrument is buried in the different location of roadbed according to actual design during roadbed filling, during detecting instrument is embedded Pass through the specific depth of measurement of the level Accurate Calibration instrument.Meanwhile after the completion of roadbed filling, it is arranged in roadbed side slope middle section Several displacement observation points detect level and the vertical displacement of side slope by steel ruler and spirit level.
6. according to the method described in claim 3, it is characterized in that, the level of ground water control in the step 2) uses water level control System processed, specific level of ground water control and data acquisition include content:
A. roadbed is created, vertical well underground water is controlled using level of ground water control system after roadbed reaches final settlement after construction Position is kept for the 20cm15 days time of level of ground water, then open discharge outlet and drained, is discharged at distance model body bottom 20cm 7 day time is kept after water, this is recycled for first time groundwater level, during which acquisition, roadbed top surface and slope displacement observation point Elevation, the horizontal displacement of slope displacement observation point to experimental tank, the reading of soil pressure cell, the reading of soil moisture meter, single-point it is heavy The reading of instrument, the reading of roadbed top surface dial gauge and the reading for monitoring horizontal displacement dial gauge in side slope drop, and total data is equal It is acquired using computer reading mode;
B. level of ground water control system is reused after first time groundwater level cycle controls vertical well level of ground water in distance It at the 30cm of model bottom, is kept for the 30cm15 days time of level of ground water, then open discharge outlet and drained, drains guarantor after water purification 7 day time is held, this is recycled for second of groundwater level, during which elevation, the side of acquisition, roadbed top surface and slope displacement observation point Slope displacement observation point to the horizontal displacement of experimental tank, the reading of soil pressure cell, soil moisture meter reading, single-point sedimentometer reading The reading of horizontal displacement dial gauge, total data are all made of calculating in number, the reading of roadbed top surface dial gauge and monitoring side slope Machine reading mode acquires;Until off-test when groundwater level is recycled to distance model body bottom 80cm.
CN201810452844.8A 2018-05-13 2018-05-13 A kind of controlling groundwater level monitoring subgrade settlement rule test model and test method Pending CN108645997A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111896717A (en) * 2020-09-22 2020-11-06 兰州理工大学 Soil seepage-settlement testing method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102519811A (en) * 2011-12-16 2012-06-27 山东大学 Model and method for testing deformation and stress variation law of intensity attenuation roadbed
CN202421181U (en) * 2012-01-13 2012-09-05 山东大学 Salinity aggregation regulation test model for salinized soil roadbed
CN103233486A (en) * 2013-05-10 2013-08-07 山东大学 Testing device and testing method of anchor-tension type retaining wall model
CN205483956U (en) * 2016-03-07 2016-08-17 盐城工学院 Test device that simulation weak soil embankment soaks stability repeatedly and warp
CN105974088A (en) * 2016-05-04 2016-09-28 同济大学 Water level cycle rising and falling induced ground settlement test apparatus and test method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102519811A (en) * 2011-12-16 2012-06-27 山东大学 Model and method for testing deformation and stress variation law of intensity attenuation roadbed
CN202421181U (en) * 2012-01-13 2012-09-05 山东大学 Salinity aggregation regulation test model for salinized soil roadbed
CN103233486A (en) * 2013-05-10 2013-08-07 山东大学 Testing device and testing method of anchor-tension type retaining wall model
CN205483956U (en) * 2016-03-07 2016-08-17 盐城工学院 Test device that simulation weak soil embankment soaks stability repeatedly and warp
CN105974088A (en) * 2016-05-04 2016-09-28 同济大学 Water level cycle rising and falling induced ground settlement test apparatus and test method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111896717A (en) * 2020-09-22 2020-11-06 兰州理工大学 Soil seepage-settlement testing method
CN111896717B (en) * 2020-09-22 2021-04-30 兰州理工大学 Soil seepage-settlement testing method

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