CN110186787A - A kind of test and prediction technique for getting over soft clay pore pressure under the Subway Loading of river - Google Patents
A kind of test and prediction technique for getting over soft clay pore pressure under the Subway Loading of river Download PDFInfo
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- CN110186787A CN110186787A CN201910417794.4A CN201910417794A CN110186787A CN 110186787 A CN110186787 A CN 110186787A CN 201910417794 A CN201910417794 A CN 201910417794A CN 110186787 A CN110186787 A CN 110186787A
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- 239000011148 porous material Substances 0.000 title claims abstract description 56
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 238000011068 loading method Methods 0.000 title claims abstract description 29
- 239000004927 clay Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000002689 soil Substances 0.000 claims abstract description 23
- 238000007596 consolidation process Methods 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 238000010606 normalization Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 2
- 230000001737 promoting effect Effects 0.000 abstract 1
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007773 growth pattern Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
- G01N2203/0007—Low frequencies up to 100 Hz
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A kind of test and prediction technique for getting over soft clay pore water pressure under the Subway Loading of river, includes the next steps: (1) installing soil sample in two-way dynamic triaxial apparatus, open water discharging valve, set corresponding consolidation pressure and carry out discharging consolidation to clay sample；(2) confining pressure is adjusted after the completion of discharging consolidation to corresponding size, holding water discharging valve is opened, identical as back-pressure size to pore water pressure size；(3) water discharging valve is closed, applying frequency is the vertical to pulsating stress and horizontal direction pulsating stress of 1HZ；(4) size of soil body pore water pressure in different cycles is recorded during CYCLIC LOADING, cycle period acquires a data；(5) according to test data, the situation of change of soft clay pore water pressure under the Subway Loading of river is got over using quadratic logarithm Function Fitting.Test operation of the present invention is simple, and obtained result is succinct, convenient for promoting and using.
Description
Technical field
The present invention relates to the Dynamic Characteristics Test technical field of subway foundation soft clay more particularly to a kind of tests and prediction
The method of the Super-void Water Pressure force value of soft clay more under the Subway Loading of river.
Background technique
For the city for having rivers to pass through, the traffic jam issue for crossing river is always protruded, it is also desirable to more get over river subway
To alleviate traffic pressure.Therefore, at present China had more and more cities build in succession or be completed pass through weak soil area
Cross river subway tunnel.Since the variation of upper overburden layer and SEA LEVEL VARIATION are obvious, the more deformation of river subway tunnel is often bigger；Together
Requirement of the Shi Yuejiang subway for antiseepage is high, if the deformation in tunnel is excessive, will adversely affect to the safe operation of subway.
The consolidation settlement that pore water pressure dissipation generates under subway cyclic load causes more river subway settlement after construction
Key factor can be used for subway by the excess pore water pressure situation of change that test obtains soft clay under more river Subway Loading
The prediction of sedimentation.The dynamic pore water pressure test of soft clay generallys use dynamic triaxial tests instrument, and dynamic triaxial tests can be divided into again
Conventional one-way circulation load test and bidirectional circulating load test.Subway load is not only generated vertically in foundation soil to dynamic
Stress, while horizontal direction dynamic stress is also had, therefore using conventional one-way circulation load dynamic triaxial tests and actual load
Situation is not inconsistent；Existing bidirectional circulating load test test waveform, dynamic stress size, in terms of have nothing in common with each other,
Not yet be related to specifically for the more test of river subway load and pore water pressure force prediction method, thus obtained result often also without
Method reflection gets over river subway and acts on the lower true pore pressure development of soft clay.It would therefore be highly desirable to provide a kind of effective test measurement
The method of soft clay pore pressure characteristic overcomes drawbacks described above more under the Subway Loading of river.
Summary of the invention
In order to overcome the prior art can not efficiency test measurement get over river Subway Loading under soft clay pore pressure characteristic not
Foot, the present invention propose a kind of effective dynamic triaxial tests method, obtain the excess pore water of soft clay under more river Subway Loading
Pressure, and predict the case where it changes with the increase of CYCLIC LOADING number, to solve above-mentioned problems of the prior art.
To achieve the above object, technical solution of the present invention includes the following steps:
A kind of test and prediction technique for getting over soft clay pore pressure under the Subway Loading of river, comprising the following steps:
(1) soil sample is installed in two-way dynamic triaxial apparatus, is opened water discharging valve, is set corresponding consolidation pressure to clay sample
Carry out discharging consolidation；
(2) after the completion of sample discharging consolidation, adjustment effective confining pressure to corresponding size, effective confining pressure p ' must be according to getting over river
Overburden layer thickness carries out value on iron；It keeps water discharging valve to open, can carry out to pore water pressure size is identical as back-pressure size
Power load；
(3) water discharging valve is closed, difference is in the vertical direction 1HZ bias sine wave with application frequency in horizontal direction,
It is consistent vertically to the phase of pulsating stress and horizontal direction pulsating stress；
(4) variation of soil body pore water pressure is recorded during CYCLIC LOADING, data of circle collection, circulation is adopted every time
Collection setting number of data point is simultaneously averaged；
(5) according to test data, the case where variation using quadratic logarithm Function Fitting pore water pressure u with load number.
Further, in the step (1), used consolidation stress is Effective consolidation stress pc', Effective consolidation stress root
The soil body precosolidation stress progress value of more river subway tunnel crossing river bottom key horizon in report is surveyed according to ground.
Further, in the step (2), the confining pressure is the thickness of overburden layer on effective confining pressure p ', with more river subway
It spends related；It is rushed when value according to the riverbed and is determined in line, the upper overburden layer THICKNESS CALCULATION obtained according to siltation maximum value is most
Big confining pressure, according to the upper overburden layer THICKNESS CALCULATION minimum confining pressure washing away maximum value and obtaining；Between maximum confining pressure and minimum confining pressure
Choose 3~5 different confining pressures simulations get over covered on the subways of river punching in different operating conditions.
Further, it is erected in the step (3), is directly bias sine wave, wave to pulsating stress and horizontal direction pulsating stress
The schematic diagram difference of shape is as depicted in figs. 1 and 2.It is vertically 30kPa ± 20kPa, horizontal direction pulsating stress to pulsating stress size
Amplitude with take 0.8,0.5,0.2,0 respectively to the ratio between pulsating stress amplitude vertically, 0~2m below simulation underground railway track, 2~
Horizontal direction dynamic stress suffered by 4m, 4~8m and 8m or less the soil body.
In the step (4), interval 0.05s acquires 20 pore water pressures in each cycle；Excess pore water pressure is according to formula
ΔuN=uN-u0It is calculated, Δ uNFor the excess pore water pressure size in n-th period, uNFor 20 pore waters in the n-th period
The average value at number pressure strong point, u0For soil body pore water pressure size before CYCLIC LOADING.
In the step (5), using quadratic logarithm function to soft clay excess pore water pressure under more river Subway Loading
It is fitted with the situation of change of load number, functional relation used by being fitted isWherein A, B, C are respectively fitting parameter,For
Excess pore water press ratio after normalization, N are the number of CYCLIC LOADING, pc' for sample consolidation when effective confining pressure.
The invention has the benefit that carrying out two-way dynamic triaxial to more river soil in metro using two-way dynamic triaxial apparatus
Test obtains the changing rule for getting over soft clay pore water pressure under river subway cyclic load, and uses quadratic logarithm function
Predict the pore water pressure of foundation soil body when more river subway circulation with the growth pattern of CYCLIC LOADING number.The load item of test
Part, waveform, dynamic stress are chosen according to the feature of more river load, can relatively accurately reflect actual condition；Three are moved simultaneously
Axis instrument popularization degree is high, in practical projects using more convenient.
Detailed description of the invention
Fig. 1 is the present invention vertically to the waveform diagram of pulsating stress；
Fig. 2 is the waveform diagram of horizontal direction pulsating stress of the present invention；
Fig. 3 is implementation flow chart of the invention.
Fig. 4 is the pore water pressure matched curve that the present invention obtains.
Specific embodiment
Now in conjunction with attached drawing and specific embodiment, the present invention is described further.
Referring to Fig.1~Fig. 4, a kind of test and prediction technique for getting over soft clay pore pressure under the Subway Loading of river, including with
Lower step:
(1) soil sample is installed on two-way dynamic triaxial apparatus, opens water discharging valve, classification carries out back-pressure saturation to sample, to
The pore water pressure coefficient B value of the soil body is believed that soil body sample reaches saturation when reaching 0.97；Water discharging valve is kept it turned on, and is adopted
With Effective consolidation stress pc'=250kPa carries out etc. to consolidation sample.
(2) the back-pressure volume change for recording consolidation stage sample, the displacement to sample in 2 hours are less than 0.012cm3,
Terminate the discharging consolidation stage, according to riverbed punching in line, by the effective confining pressure of various sample be separately adjusted to angularly 150kPa, 200kPa and
250kPa is to simulate the operating condition that overburden layer on subway tunnel is respectively 8m, 13m and 18m, after confining pressure adjustment, to pore water pressure size
It is identical as back-pressure size to carry out power load；
(3) water discharging valve is closed, is arranged vertically to the parameter of pulsating stress and horizontal direction pulsating stress；Sample application is followed
Ring load, load number are 20000 times.
Further, which includes:
3.1) vertically to the pattern of pulsating stress as shown in Fig. 2, be frequency be 1HZ bias sine wave, pulsating stress
Size is between 10~50kPa, a reference value of pulsating stressFor 30kPa, the amplitude of pulsating stressFor 20kPa.
3.2) horizontal direction pulsating stress pattern as shown in figure 3, horizontal direction pulsating stress with vertically to pulsating stress phase
Frequency is equal；The amplitude of horizontal direction pulsating stress with vertically to the ratio between pulsating stress amplitude take respectively 0.8,0.5,0.2,0 with
Different depth soil body horizontal is simulated to dynamic stress situation, obtains various sample horizontal direction pulsating stress amplitudeRespectively 16kPa,
10kPa, 4kPa and 0kPa.
(4) size of soil body axial direction excess pore water pressure is recorded during CYCLIC LOADING, every 5 periods acquisition is primary,
Each cycle acquires 20 data points；Excess pore water pressure is according to formula Δ uN=uN-u0It is calculated, Δ uNFor surpassing for n-th period
Pore water pressure size, uNFor n-th period pore water pressure size, according to the 20 pore pressure numbers obtained in n-th when calculating
Strong point is averaged to obtain, u0For soil body pore water pressure size before CYCLIC LOADING.
(5) according to test data, pore water pressure is carried out with the rule of load number variation using quadratic logarithm function
Fitting.The step process is as follows:
Using functionTo more river subway cyclic load
The excess pore water pressure for acting on lower soft clay is fitted with the case where CYCLIC LOADING number growth；Wherein ruFor Super-void Water Pressure
Power ratio is the excess pore water pressure after normalization,
Using method of the invention, the silty clay of Hangzhou electromechanics Vocationl Technical College near the Qiantang River is taken to carry out power special
Property test, the loading method proposed according to the present invention simulates more river subway cyclic load, obtains the excess pore water of the soil body
Pressure, and result is fitted with data processing method proposed by the present invention, it is native under more river Subway Loading to predict
The growth pattern of body pore water pressure, obtained fitting parameter are shown in Table 1.Pore water pressure matched curve is as shown in Figure 4.
Table 1
The detection and prediction method of soft clay excess pore water pressure proposed by the present invention more under the Subway Loading of river, can be with
For getting over the prediction of river subway settlement after construction.This method is easy to operate, and dynamic triaxial tests instrument popularization degree is high, experimental data processing
Method is simple, and obtained pore pressure prediction formula is succinct, convenient for using in calculating, therefore has good promotion prospect.
Claims (6)
1. the test and prediction technique of soft clay dynamic characteristics under a kind of more river Subway Loading, which is characterized in that the side
Method the following steps are included:
(1) soil sample is installed in two-way dynamic triaxial apparatus, opens water discharging valve, sets corresponding consolidation pressure and clay sample is carried out
Discharging consolidation；
(2) after the completion of discharging consolidation, adjustment effective confining pressure to corresponding size, effective confining pressure p ' must be according to earthing on more river subway
Thickness degree carries out value；It keeps water discharging valve to open, power can be carried out when pore water pressure size is identical as back-pressure size and added
It carries；
(3) water discharging valve is closed, is erected in the vertical direction with the bias sine wave that application frequency is 1HZ in horizontal direction respectively
It directly must be consistent to the phase of pulsating stress and horizontal direction pulsating stress；
(4) numerical value of soil body pore water pressure, data of circle collection, each cycle period are recorded during CYCLIC LOADING
Acquisition setting number of data point, is averaged to obtain the period pore water pressure to number of data point is set in a cycle
uNSize；
(5) according to test data, using quadratic logarithm Function Fitting pore water pressure with the rule of load number variation.
2. method as described in claim 1, which is characterized in that in the step (1), used consolidation stress is effective
Consolidation stress p 'c, Effective consolidation stress base area survey report in more river subway tunnel crossing river bottom key horizon the soil body it is earlier
Consolidation stress carries out value.
3. method according to claim 1 or 2, which is characterized in that in the step (2), the effective confining pressure p ' and more river
The thickness of overburden layer is related on subway；It is rushed when value according to the riverbed and is determined in line, obtained according to siltation maximum value upper
Overburden layer THICKNESS CALCULATION maximum confining pressure, according to the upper overburden layer THICKNESS CALCULATION minimum confining pressure washing away maximum value and obtaining；It is enclosed in maximum
Chosen between pressure and minimum confining pressure 3~5 different confining pressures simulations get over covered on the subways of river punching in different operating conditions.
4. method according to claim 1 or 2, which is characterized in that in the step (3), vertically to the size of pulsating stress
Between 10~50kPa, a reference valueFor 30kPa, the amplitude of pulsating stressFor 20kPa.Various sample horizontal direction circulation is answered
The amplitude of power and take 0.8,0.5,0.2,0 respectively to the ratio between stress amplitude vertically, 0~2m, 2~4m, 4 below simulation underground railway track
Horizontal direction dynamic stress suffered by~8m and 8m or less the soil body.
5. method according to claim 1 or 2, which is characterized in that in the step (4), 0.05s acquisition in interval in each cycle
20 pore water pressures；Excess pore water pressure is according to formula Δ uN=uN-u0It is calculated, Δ uNFor the excess pore water in n-th period
Pressure size, uNFor the average value of 20 pore water pressure data points in the n-th period, u0For soil body pore water before CYCLIC LOADING
Pressure size.
6. method according to claim 1 or 2, which is characterized in that in the step (5), using quadratic logarithm function to more
Soft clay excess pore water pressure is fitted with the situation of change of load number under the Subway Loading of river, letter used by being fitted
Counting relational expression isWherein A, B, C are respectively fitting parameter,For the excess pore water press ratio after normalization, N is the number of CYCLIC LOADING, p 'cEffectively enclosing when being consolidated for sample
Pressure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111458273A (en) * | 2020-04-16 | 2020-07-28 | 四川大学 | Model and method for discriminating hydraulic pressure lifting of porous medium under chemical reaction |
| US12000820B2 (en) | 2020-02-26 | 2024-06-04 | The Hong Kong University Of Science And Technology | Multifunctional and modular geotechnical testing device |
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| US20140137660A1 (en) * | 2009-10-28 | 2014-05-22 | Halliburton Energy Services, Inc. | Cement Testing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12000820B2 (en) | 2020-02-26 | 2024-06-04 | The Hong Kong University Of Science And Technology | Multifunctional and modular geotechnical testing device |
| CN111458273A (en) * | 2020-04-16 | 2020-07-28 | 四川大学 | Model and method for discriminating hydraulic pressure lifting of porous medium under chemical reaction |
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