CN104089817A - Reference bedding coefficient tester and indoor general testing method thereof - Google Patents
Reference bedding coefficient tester and indoor general testing method thereof Download PDFInfo
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Abstract
The invention relates to a reference bedding coefficient tester and an indoor general testing method thereof. Through comparative analysis of field and indoor measured data and on the basis of the equivalent relationship of a deformation modulus, an indoor test calculation formula can be deduced, and according to the deformation and time change rule of soil under the effect of uniformly distributed load, the indoor test control and calculation method is designed. Tests verify that the method has validity and reliability, and can accurately determine the reference bedding coefficient values of various fine grained soils under an in-situ state indoors. The tester provided by the invention has the advantages of simple structure, convenient use and short test period, the measured results are equivalent to those of in-situ K30 tests, and the test principle is accord with basic theories. The method for determination of the bedding coefficient is rapid, simple and accurate.
Description
Technical field
The present invention relates to ground field of measuring technique, specifically a kind of benchmark bedding value tester and indoor universal method of testing thereof.
Background technology
Bedding value is the key parameter of Winkler foundation model.Current is original position K for measuring the standard method of bedding value
30loading test, does not have the standard test method of measuring foundation bed coefficient indoor.Only in < < sub., track traffic rock engineering prospecting > > standard, available triaxial test has been proposed and consolidation test method is determined bedding value, but there is no concrete experimental technique standard and evaluation method, in practical operation, there is many uncertain factors, be difficult to carry out.Through practical implementations such as Yangtze River Tunnel, Tianjin Underground, institute's measured value and standard value differ 5-10 doubly, experiment boundary condition and the K of these two kinds of methods
30load test differs greatly, its measured value and K
30between standard value, be how associatedly also there is no so far an answer.
Along with scientific and technical high speed development, the engineerings such as building foundation pit, subway, tunnel are more and more, by load test, measure the restriction that bedding value is subject to factors, adopt shop experiment rapid and accurate determination benchmark bedding value to have larger practical value and economic worth.
Summary of the invention
The object of the invention is to develop a kind of benchmark bedding simple in structure, effective is that testing tool is at the indoor universal testing method of measuring fast and accurately all kinds of fine grained soil benchmark bedding values.
Benchmark bedding value tester of the present invention, comprising: frame 7, in frame 7, be provided with container 6, and frame 7 is by additional press box 3 fixed installation power sensors 18, and displacement transducer is fixed on power sensor 18 lower ends.
Described container 6, comprising: interior pressure transmission plate 8, unofficial biography pressing plate 9, guide ring 10, upper flange 11, cavity 13, lower flange, base 14; Between interior pressure transmission plate 8 and unofficial biography pressing plate 9, by built-in 4 groups of linear bearings, connect guiding; Cavity 13 inner wall sleeves have cylindric Emulsoid-film, are bolted sealing mineralization pressure chamber 16 with upper flange 11, lower flange; Cavity 13 both sides are provided with valve 1, valve 2 12; Valve one 15 Bonding pressure chamber 16 adjustment with volume pipe joints, valve 2 12 connects side pressure controller; Guide ring 10 is fixed by screws on upper flange 11.
Described frame 7, comprising: lever 1, lever 22, additional press box 3, in add handwheel 1, two handwheels 5 of adjustment (adjusting) lever 22 levels, the container holder of press box 4, adjustment (adjusting) lever one 1 levels; Inside add on press box 4 truck dead levers 1, on additional press box 3 truck dead levers 22.
Described power sensor 18, displacement transducer are connected with collector by wire, and collector is connected with computerized control system; The hydraulic cavities volume adjustment cylinder of side direction pressurization apparatus, Full Automatic Liquid pressure controller are connected with pressure chamber 16 by pipeline, valve respectively.
Benchmark bedding value tester indoor universal method of testing of the present invention, its concrete steps are as follows:
1. container is assembled by structural requirement, in hydraulic cavities volume adjustment cylinder, fill with degassed distilled water; Open water intaking valve, in pressure chamber, fill with de aerated water, get rid of whole bubbles; Standard correction test block (φ=100mm/150mm, h=150mm) is put into container; By 100KPa/min, apply step by step lateral pressure, until 800KPa, keep 800KPa press 10 minutes water-tight; Removal pressure, takes out correcting block;
2. prepare diameter 100mm or 150mm, high 140mm sample, two ends will be put down, 15～18 of the filter paper bars of saturated soft soil sample surrounding subsides width 5mm, and other sample does not paste filter paper bar; Get rid of gas in pipeline, on container base, put porous disc, filter paper and the sample preparing are placed on porous disc, put container cavity and lock with base, pressure transmission piston bush is placed on to sample top, fixed piston cover guide ring, and container is placed in frame, rotate handwheel and make lever one and lever two keep horizontality;
3. the pressure chamber adjustment with volume pipe joint height that raises, makes pressure chamber adjustment with volume pipe joint liquid level higher than sample end face 20cm left and right, when film and sample are adjacent to completely, and valve-off 1;
4. according to the size of sample original position gravity pressure to the sample stress state that sets back of exerting pressure, when pressing shallow-layer formula and convert, gravity pressure can all be added in (1:24) on lever one; When converting by deep layer formula, gravity pressure should be added in respectively on lever one (1:24) and lever two (1:12), the diameter of lever two corresponding pressing plates is 5cm, and the compression area of lever one correspondence is that external diameter is the annulus area that specimen finish, interior diameter are 5cm;
5. open intelligent hydraulic controller, open valve 2, observe real-time side pressure value and shift value, when shift value variable quantity per hour is not more than 0.005mm, according to side pressure currency (the side pressure value that also can calculate by Stationary side pressure coefficient), carry out voltage stabilizing;
6. when converting by deep layer formula, directly on the hanging scaffold of lever two, classification applies vertical load, guarantee has 2-3 level load before sample produces 0.2mm displacement, total progression is no less than 8 grades, the size of every grade of load increment is pressed the compression property of sample and is determined, when pressing the conversion of shallow-layer formula, should apply pressure at right angle by first removal, after hydraulic controller is again stable, on the hanging scaffold of lever two, classification applies vertical load, guarantee has 2-3 level load before sample produces 0.2mm displacement, total progression is no less than 8 grades, the size of every grade of load increment is pressed the compression property of sample and is determined,
7. the shift value that every grade of load is surveyed and read 0,10,20,30,60,90,120min is corresponding also applies next stage load, until sample destroys or predetermined load finishes test, the whole pressure of removal, takes out sample, cleaning container;
8. calculate and drawing
1) press and calculate the inverse that the average settlement speed of period is read in each survey of load following formula at different levels;
M＝T/△S
△S＝S
t-S
0
The inverse that in formula, M is settling velocity (h/mm); T is for surveying the duration (h) of read point; △ S is for surveying the absolute settlement amount (mm) of read point; S
0for the reading (mm) before certain grade of load loading; S
tfor certain surveys the reading (mm) of read point
2) take T/ △ S is ordinate, and T is that abscissa is drawn rectangular coordinates figure, and the slope A value that solves straight line with graphical method or one-variable linear regression is shown in Fig. 4;
3) calculate the final settlement △ S of certain grade of load
n
△S
n＝1/A
The slope that in formula, A is straight line (1/mm);
4) according to the order of loading by the final settlement △ S of loads at different levels
nadd up successively and amplify 6 α doubly (α is constant, α=0.930 when original position adopts diameter 30cm pressing plate to make benchmark), circular plate is made to 5.58 times of benchmark, obtain cumulative settling amount modified value, the cumulative settling amount modified value of take is ordinate, force value is that horizontal seat is drawn p-s curve, on this p-s curve, asks for and looks bedding value K
1;
5) calculate benchmark bedding value
Press shallow-layer and control test
K
30 gardens=K
1
K
30 gardensfor original position adopts diameter, it is the benchmark bedding value (MPam-1) that 30cm circular pressing plate records; K
1for looking bedding value K
1=P
1.25/ 1.25 or K
1=P
1/2/
s1/2or P-S curve the initial segment straight slope, P
1.25force value (kpa) for corresponding 1.25 millimeters of sedimentations in curve map; P
1/2for half force value (kpa) of critical edge pressure; S
1/2for half sedimentation value (mm) corresponding to force value of critical edge pressure;
By deep layer, control test
In formula, Z is the actual buried depth (m) of soil, and the minimum depth should not be less than 1m.
The advantage of benchmark bedding value tester indoor universal method of testing of the present invention is: apparatus structure is simple, easy to use, test period is short, can effectively measure the benchmark bedding system that maximum grain is not more than 5mm soil, can press shallow-layer control method again can be by deep layer control method the benchmark bedding value value at all kinds of soil of indoor rapid and accurate determination.The benchmark bedding value value that adopts deep layer control method to measure does not need to carry out degree of depth correction.Adopt 150mm sample and adopt 100mm sample on not significantly impact of test result.Measured result and original position K
30test result equivalence; Test philosophy meets basic theories; Through actual contrast verification repeatedly, test result and K
30standard matches; This method is measured bedding value fast, simply, accurately.
Accompanying drawing explanation
Fig. 1 benchmark bedding value tester is faced structural representation.
Fig. 2 benchmark bedding value tester side-looking structural representation
Fig. 3 structure of container schematic diagram.
Fig. 4 regression curve illustration
Embodiment
Benchmark bedding value tester of the present invention, comprising: frame 7, in frame 7, be provided with container 6, and frame 7 is by additional press box 3 fixed installation power sensors 18, and displacement transducer is fixed on power sensor 18 lower ends.
Described container 6, comprising: interior pressure transmission plate 8, unofficial biography pressing plate 9, guide ring 10, upper flange 11, cavity 13, lower flange, base 14; Between interior pressure transmission plate 8 and unofficial biography pressing plate 9, by built-in 4 groups of linear bearings, connect guiding; Cavity 13 inner wall sleeves have cylindric Emulsoid-film, are bolted sealing mineralization pressure chamber 16 with upper flange 11, lower flange; Cavity 13 both sides are provided with valve 1, valve 2 12; Valve one 15 Bonding pressure chamber 16 adjustment with volume pipe joints, valve 2 12 connects side pressure controller; Guide ring 10 is fixed by screws on upper flange 11.
Described frame 7, comprising: lever 1, lever 22, additional press box 3, in add handwheel 1, two handwheels 5 of adjustment (adjusting) lever 22 levels, the container holder of press box 4, adjustment (adjusting) lever one 1 levels; Inside add on press box 4 truck dead levers 1, on additional press box 3 truck dead levers 22.
Described power sensor 18, displacement transducer are connected with collector by wire, and collector is connected with computerized control system; The hydraulic cavities volume adjustment cylinder of side direction pressurization apparatus, Full Automatic Liquid pressure controller are connected with pressure chamber 16 by pipeline, valve respectively.
Benchmark bedding value tester indoor universal method of testing of the present invention, its concrete steps are as follows:
1. container is assembled by structural requirement, in hydraulic cavities volume adjustment cylinder, fill with degassed distilled water; Open water intaking valve, in pressure chamber, fill with de aerated water, get rid of whole bubbles; Standard correction test block (φ=100mm/150mm, h=150mm) is put into container; By 100KPa/min, apply step by step lateral pressure, until 800KPa, keep 800KPa press 10 minutes water-tight; Removal pressure, takes out correcting block;
2. prepare diameter 100mm or 150mm, high 140mm sample, two ends will be put down, 15～18 of the filter paper bars of saturated soft soil sample surrounding subsides width 5mm, and other sample does not paste filter paper bar; Get rid of gas in pipeline, on container base, put porous disc, filter paper and the sample preparing are placed on porous disc, put container cavity and lock with base, pressure transmission piston bush is placed on to sample top, fixed piston cover guide ring, and container is placed in frame, rotate handwheel and make lever one and lever two keep horizontality;
3. the pressure chamber adjustment with volume pipe joint height that raises, makes pressure chamber adjustment with volume pipe joint liquid level higher than sample end face 20cm left and right, when film and sample are adjacent to completely, and valve-off 1;
4. according to the size of sample original position gravity pressure to the sample stress state that sets back of exerting pressure, when pressing shallow-layer formula and convert, gravity pressure can all be added in (1:24) on lever one; When converting by deep layer formula, it is upper with bar two (1:12) that gravity pressure should be added in respectively lever one (1:24), and the diameter of bar two corresponding pressing plates is 5cm, and the compression area of lever one correspondence is that external diameter is the annulus area that specimen finish, interior diameter are 5cm;
5. open intelligent hydraulic controller, open valve 2, observe real-time side pressure value and shift value, when shift value variable quantity per hour is not more than 0.005mm, according to side pressure currency (the side pressure value that also can calculate by Stationary side pressure coefficient), carry out voltage stabilizing;
6. when converting by deep layer formula, directly on the hanging scaffold of lever two, classification applies vertical load, guarantee has 2-3 level load before sample produces 0.2mm displacement, total progression is no less than 8 grades, the size of every grade of load increment is pressed the compression property of sample and is determined, when pressing the conversion of shallow-layer formula, should apply pressure at right angle by first removal, after hydraulic controller is again stable, on the hanging scaffold of lever two, classification applies vertical load, guarantee has 2-3 level load before sample produces 0.2mm displacement, total progression is no less than 8 grades, the size of every grade of load increment is pressed the compression property of sample and is determined,
7. the shift value that every grade of load is surveyed and read 0,10,20,30,60,90,120min is corresponding also applies next stage load, until sample destroys or predetermined load finishes test, the whole pressure of removal, takes out sample, cleaning container;
8. calculate and drawing
1) be calculated as follows the inverse that the average settlement speed of period is read in each survey under loads at different levels;
M＝T/△S
△S＝S
t-S
0
The inverse that in formula, M is settling velocity (h/mm); T is for surveying the duration (h) of read point; △ S is for surveying the absolute settlement amount (mm) of read point; S
0for the reading (mm) before certain grade of load loading; S
tfor certain surveys the reading (mm) of read point
2) take T/ △ S is ordinate, and T is that abscissa is drawn rectangular coordinates figure, and the slope A value that solves straight line with graphical method or one-variable linear regression is shown in Fig. 4;
3) calculate the final settlement △ S of certain grade of load
n
△S
n＝1/A
The slope that in formula, A is straight line (1/mm);
4) according to the order of loading by the final settlement △ S of loads at different levels
nadd up successively and amplify 6 α doubly (α is constant, α=0.930 when original position adopts diameter 30cm pressing plate to make benchmark), circular plate is made to 5.58 times of benchmark, obtain cumulative settling amount modified value, the cumulative settling amount modified value of take is ordinate, force value is that horizontal seat is drawn p-s curve, on this p-s curve, asks for and looks bedding value K
1;
5) calculate benchmark bedding value
Press shallow-layer and control test
K
30 gardens=K
1
K
30 gardensfor original position adopts diameter, it is the benchmark bedding value (MPam-1) that 30cm circular pressing plate records; K
1for looking bedding value K
1=P
1.25/ 1.25 or K
1=P
1/2/
s1/2or P-S curve the initial segment straight slope, P
1.25force value (kpa) for corresponding 1.25 millimeters of sedimentations in curve map; P
1/2for half force value (kpa) of critical edge pressure; S
1/2for half sedimentation value (mm) corresponding to force value of critical edge pressure;
By deep layer, control test
In formula, Z is the actual buried depth (m) of soil, and the minimum depth should not be less than 1m.
Verification experimental verification
The correctness of analyzing for check test and the reliability of indoor test and computing method, carry out original position and indoor to compare experimental study be unique reliable means.In order to obtain high accuracy in-situ test data, designed and produced a set of original position k
30test macro.Pressure system adopts accurate pneumaticpiston to load, 2 tons of maximum output, and range 100mm, displacement adopts high accuracy displacement sensor (resolution 0.001mm) Real-time Collection automatically.Successively in weak soil place and unsaturated soil place, carried out contrast test twice.Its bedding value end result table is in Table (table 1,2,3).
Verify a bedding base system achievement contrast table 1
Verify two in-situ test outcome table tables 2
Verify two shop experiment achievement summary sheet tables 3
The inverse of (prerupture) the average settlement speed under twice demonstration test load at different levels and the duration linear regression related coefficient of experience, all more than 0.99, are the linear relationship of height.The original position k of 7 measuring points
30test α value under 63 grades of loads between 0.90-0.98, the α value of general first order load is more than 0.96, the α value of 1 to 2 load that approaches failing load 0.90 with left and right, other α value is between 0.90-0.95, average 0.932 is very close with research value 0.930, and it is reliable that α value gets 0.930.
The in-situ test of checking 1 is the different dark mensuration respectively of testing pits, and shop experiment sample gathers with hole wall in hole, specimen finish 15cm, and its corresponding bedding value value is very close, and all within the scope of specification recommends value.
The in-situ test of checking 2 is at a 50m
2carry out in weak soil place, and indoor sample is taked with rig with 102mm thin-wall sampler, and indoor result and specification recommends value match.Its large value and in-site detecting value basic to, its mean value is less than normal than original position mean value.On-the-spot in-situ test and results of drilling show within the scope of the 1-5 rice of place to be silt clay, Muddy Bottoms sub-prime clay folder thin layer flour sand and silt, original position k
30reaction be the integrated value within the scope of 60cm under pressing plate, indoor sample only has 13-14cm high, relative homogeneous, when sample approaches with former place value during containing interlayer, while not containing thin layer flour sand with silt interlayer test result less than normal than former place value be a kind of normal phenomenon.When practical engineering application, should take respectively sample to test at different depth, thereby determine the typical value on this stratum.
Checking conclusion
1. particulate soil in-situ load test the soil body do not occur to shear broken before, the inverse of average settlement speed under loads at different levels and the duration of experience are property line relation highly; When adopt continuous two hours settlement increments per hour be not more than 0.1mm as relatively stable target stationary value with the ratio (α value) of the terminal sedimentation value of theoretical calculating at the corresponding levels between 0.90-0.98, it is reliable that α value gets 0.930.
2. fine grained soil lab simulation load test is before sample generation shear failure, the inverse of the average settlement speed under loads at different levels is linear relationship highly with corresponding duration, test findings has fully proved that indoor test method and formula proving are effectively, meet theoretical requirement.
3. one between original position bedding value test value, indoor test value and specification recommends value three, to property, absolutely proves that it is all effectively to saturated soil and unsaturated soil that indoor test is controlled with computing method, reliable test result.
Claims (5)
1. a benchmark bedding value tester, it is characterized in that: comprising: frame (7), in frame (7), be provided with container (6), frame (7) is by additional press box (3) fixed installation power sensor (18), and displacement transducer is fixed on power sensor (18) lower end.
2. a kind of benchmark bedding value tester according to claim 1, is characterized in that: described container (6), comprising: interior pressure transmission plate (8), unofficial biography pressing plate (9), guide ring (10), upper flange (11), cavity (13), lower flange, base (14); Between interior pressure transmission plate (8) and unofficial biography pressing plate (9), by built-in (4) group linear bearing, connect guiding; Cavity (13) inner wall sleeve has cylindric Emulsoid-film, is bolted sealing mineralization pressure chamber (16) with upper flange (11), lower flange; Cavity (13) both sides are provided with valve one (15), valve two (12); Valve one (15) Bonding pressure chamber (16) adjustment with volume pipe joint, valve two (12) connects side pressure controller; Guide ring (10) is fixed by screws on upper flange (11).
3. a kind of benchmark bedding value tester according to claim 1, it is characterized in that: described frame (7), comprising: lever one (1), lever two (2), additional press box (3), in add the handwheel one (17) of press box (4), adjustment (adjusting) lever one (1) level, two handwheels (5), the container holder of adjustment (adjusting) lever two (2) levels; Inside add press box (4) truck dead lever one (1) upper, on additional press box (3) truck dead lever two (2).
4. a kind of benchmark bedding value tester according to claim 1, is characterized in that: described power sensor (18), displacement transducer are connected with collector by wire, and collector is connected with computerized control system; The hydraulic cavities volume adjustment cylinder of side direction pressurization apparatus, Full Automatic Liquid pressure controller are connected with pressure chamber (16) by pipeline, valve respectively.
5. a benchmark bedding value tester indoor universal method of testing, is characterized in that: its step is as follows:
1. container is assembled by structural requirement, in hydraulic cavities volume adjustment cylinder, fill with degassed distilled water; Open water intaking valve, in pressure chamber, fill with de aerated water, get rid of whole bubbles; By standard correction test block, φ=100mm/150 mm, h=150mm, put into container; By 100KPa/min, apply step by step lateral pressure, until 800 KPa, keep 800KPa press 10 minutes water-tight; Removal pressure, takes out correcting block;
2. prepare diameter 100mm or 150mm, high 140mm sample, two ends will be put down, 15～18 of the filter paper bars of saturated soft soil sample surrounding subsides width 5mm, and other sample does not paste filter paper bar; Get rid of gas in pipeline, on container base, put porous disc, filter paper and the sample preparing are placed on porous disc, put container cavity and lock with base, pressure transmission piston bush is placed on to sample top, fixed piston cover guide ring, and container is placed in frame, rotate handwheel and make lever one and lever two keep horizontality;
3. the pressure chamber adjustment with volume pipe joint height that raises, makes pressure chamber adjustment with volume pipe joint liquid level higher than sample end face 20cm left and right, when film and sample are adjacent to completely, and valve-off 1;
4. according to the size of sample original position gravity pressure to the sample stress state that sets back of exerting pressure, when pressing shallow-layer formula and convert, gravity pressure can all be added on lever one 1:24; When converting by deep layer formula, gravity pressure should be added in respectively lever one 1:24 and lever two 1:12 are upper, and the diameter of lever two corresponding pressing plates is 5cm, and the compression area of lever one correspondence is that external diameter is the annulus area that specimen finish, interior diameter are 5cm;
5. open intelligent hydraulic controller, open valve 2, observe real-time side pressure value and shift value, when shift value variable quantity per hour is not more than 0.005mm, according to side pressure currency, the side pressure value that also can calculate by Stationary side pressure coefficient is carried out voltage stabilizing;
6. when converting by deep layer formula, directly on the hanging scaffold of lever two, classification applies vertical load, guarantee has 2-3 level load before sample produces 0.2mm displacement, total progression is no less than 8 grades, the size of every grade of load increment is pressed the compression property of sample and is determined, when pressing the conversion of shallow-layer formula, should apply pressure at right angle by first removal, after hydraulic controller is again stable, on the hanging scaffold of lever two, classification applies vertical load, guarantee has 2-3 level load before sample produces 0.2mm displacement, total progression is no less than 8 grades, the size of every grade of load increment is pressed the compression property of sample and is determined,
7. the shift value that every grade of load is surveyed and read 0,10,20,30,60,90,120min is corresponding also applies next stage load, until sample destroys or predetermined load finishes test, the whole pressure of removal, takes out sample, cleaning container;
8. calculate and drawing
1) be calculated as follows the inverse that the average settlement speed of period is read in each survey under loads at different levels;
M=T/△S
△S=S
t-S
0
The h/mm reciprocal that in formula, M is settling velocity; T is for surveying the duration h of read point; △ S is for surveying the absolute settlement amount of read point, and unit is mm; S0 is the reading before certain grade of load loads, and unit is mm; S
tfor certain reading of surveying read point, unit is mm;
2) take T/ △ S is ordinate, and T is that abscissa is drawn rectangular coordinates figure, solves the slope A value of straight line with graphical method or one-variable linear regression;
3) calculate the final settlement △ S of certain grade of load
n
△S
n?=1/A
The slope 1/mm that in formula, A is straight line;
4) according to the order of loading by the final settlement △ S of loads at different levels
nadd up successively and amplify 6 α doubly, α is constant, α=0.930 when original position adopts diameter 30cm pressing plate to make benchmark, circular plate is made to 5.58 times of benchmark, obtain cumulative settling amount modified value, the cumulative settling amount modified value of take is ordinate, and force value is that horizontal seat is drawn p-s curve, on this p-s curve, asks for and looks bedding value K
1;
5) calculate benchmark bedding value
Press shallow-layer and control test
K
30 gardens=K
1
K
30 gardensfor original position adopts diameter, be the benchmark bedding value that 30cm circular pressing plate records, MPam-1; K
1for looking bedding value K
1=P
1.25/ 1.25 or K
1=P
1/2/
s1/2or P-S curve the initial segment straight slope, P
1.25for the force value of corresponding 1.25 millimeters of sedimentations in curve map, unit is kpa; P
1/2for half force value of critical edge pressure, unit is kpa; S
1/2for half sedimentation value corresponding to force value of critical edge pressure, unit is mm;
By deep layer, control test
In formula, Z is the actual buried depth (m) of soil, and the minimum depth should not be less than 1m.
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| CN104594323A (en) * | 2015-02-11 | 2015-05-06 | 浙江省工程勘察院 | Test device for coefficients of horizontal-reference foundation bed and test method using device |
| CN106644738A (en) * | 2017-01-20 | 2017-05-10 | 宁波冶金勘察设计研究股份有限公司 | Measurement device and method of subgrade coefficient of soil body |
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| CN106644738A (en) * | 2017-01-20 | 2017-05-10 | 宁波冶金勘察设计研究股份有限公司 | Measurement device and method of subgrade coefficient of soil body |
| CN106644738B (en) * | 2017-01-20 | 2023-10-13 | 宁波冶金勘察设计研究股份有限公司 | Soil foundation bed coefficient measuring device and measuring method |
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