CN105510178A - Density measuring equipment and method for measuring density of rockfill subgrade filler by adopting same - Google Patents
Density measuring equipment and method for measuring density of rockfill subgrade filler by adopting same Download PDFInfo
- Publication number
- CN105510178A CN105510178A CN201510915558.7A CN201510915558A CN105510178A CN 105510178 A CN105510178 A CN 105510178A CN 201510915558 A CN201510915558 A CN 201510915558A CN 105510178 A CN105510178 A CN 105510178A
- Authority
- CN
- China
- Prior art keywords
- casing
- soil pressure
- roadbed filler
- density
- row
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
- G01N2009/022—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids
- G01N2009/024—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids the volume being determined directly, e.g. by size of container
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention firstly aims to provide density measuring equipment, comprising a box body, a plurality of earth pressure cells, a tester and a weighing part, wherein the box body is not provided with an upper cover and is of a cube structure, the plurality of earth pressure cells are arranged at the inner wall of the bottom of the box body, the tester is arranged outside the box body and connected with all the earth pressure cells and is used for reading data from all the earth pressure cells, and the weighing part is arranged separately and is used for weighing. By using the density measuring equipment provided by the invention, the following effects are achieved: a, the whole structure is simplified; b, measurement precision is high; c, the density measuring equipment is suitable for a rockfill material of which the particle size is smaller than 50cm, can meet the real demand and has strong practicality. The invention secondly aims to provide a method for measuring density of rockfill subgrade filler by adopting the density measuring equipment, measurement procedures are simplified, damage on a subgrade does not occur in a measuring process, the accuracy of measurement is high and the practicability is strong.
Description
Technical field
The present invention relates to technical field of building construction, be specifically related to a kind of density measuring equipment and adopt the method for this measurement device rock-filling embankment packing density.
Background technology
In prior art, the material of roadbed adopts plastic of Rockfill mostly.Existing plastic of Rockfill derives from mostly abandons building stones by blasting excavation building stones out or other, and such plastic of Rockfill has the features such as particle diameter is large, shearing strength is high, water permeability is strong, voidage is large.The compaction theory of plastic of Rockfill is: after having paved, and the inside of plastic of Rockfill is comparatively loose; Under external forces, the internal stress state of plastic of Rockfill changes, thus cause the inner initial stress equilibrium state of plastic of Rockfill to be broken, in plastic of Rockfill, building stones particle overcomes intergranular friction power generation mobile (continuous compacted close and filling each other) mutually, thus the particle in plastic of Rockfill is reset, finally make roadbed have the feature that space is little and packing is large.
In order to determine that roadbed rolls the effect of compacting, the normal density of plastic of Rockfill that uses rolls the important indicator of consolidation effect as reaction, and the density of compactness and field measurement has close contacting.At present, the method for in-site measurement roadbed density mainly contains: (1) core cutter method: a kind of destructive method for measurement, and advantage is: equipment is simple, easy to use; Shortcoming is: the stress produced when cutting ring is squeezed in soil makes soil loosen, and the stress produced during wall thickness is larger; Be mainly used in measuring not containing the density of the cohesive soil of aggregate, and be not suitable for the measurement (operation easier is large) of Large stone rock-filling embankment; (2) sand replacement method: a kind of destructive method for measurement, it is applicable to the density measurement of fine grained soil, middle grain soil; (3) douche: first plastic sheeting is completed along ring set inwall and earth's surface, after injecting water, measure its volume and take the quality excavating filler in hole, calculate its density, the method is mainly applicable to on-site measurement coarse-grained soil and over coarse grained soil density, and need excavation to destroy existing roadbed structure, dig pit and to cheat wall stability after getting filler and be difficult to ensure, it is comparatively difficult that packing volume is got in follow-up measurement.
In sum, be badly in need of that a kind of apparatus structure is simplified, the measurement mechanism of easy to use and practical rock-filling embankment packing density and measuring method.
Summary of the invention
The first object of the present invention is to provide a kind of structure to simplify, measure precision density measuring equipment high and easy to use, and concrete technical scheme is as follows:
A kind of density measuring equipment, comprise without upper cover and for the casing of cube structure, the multiple soil pressure cells be arranged on described bottom half inwall, be arranged on described casing outer and be connected with all described soil pressure cells for reading the tester of all described soil pressure cell data and the independent weighing parts for taking weight arranged.
Preferred in above technical scheme, described casing is square or rectangular structure.
Preferred in above technical scheme, described soil pressure cell is 9 that are scattered in matrix pattern.
Preferred in above technical scheme, the quantity of described soil pressure cell is 5, and four described soil pressure cells are distributed on its surrounding with a described soil pressure cell for the center of circle, and the described soil pressure cell being in home position is arranged on the bottom centre position of described casing.
Preferred in above technical scheme, the quantity of described soil pressure cell is 10, all described soil pressure cells the first row arranged in parallel, the second row and the third line, and wherein said the first row and the third line are symmetrical arranged about the vertical plane at the second row place; Described the first row and described the third line comprise three described soil pressure cells respectively, and described second row comprises four described soil pressure cells, and all equal with the distance between adjacent rows with the distance between adjacent two the described soil pressure cells of a line.
Preferred in above technical scheme, the quantity of described soil pressure cell is 11, all described soil pressure cells the first row arranged in parallel, the second row and the third line, and wherein said the first row and the third line are symmetrical arranged about the vertical plane at the second row place; Described the first row and described the third line comprise four described soil pressure cells respectively, and described second row comprises three described soil pressure cells, and all equal with the distance between adjacent rows with the distance between adjacent two the described soil pressure cells of a line.
Preferred in above technical scheme, all described soil pressure cells are all connected with tester by electric wire, the inwall of described casing are also provided with the protection assembly for the protection of described electric wire.
Preferred in above technical scheme, described soil pressure cell is resistance-strain type soil pressure cell; Described weighing parts are weighbridge; The material of described casing is steel.
Apply technical scheme of the present invention, there is following beneficial effect:
(1) casing of the present invention comprise without upper cover and for the casing of cube structure, the multiple soil pressure cells be arranged on described bottom half inwall, be arranged on described casing outer and is connected with all described soil pressure cells for reading the tester of all described soil pressure cell data and the independent weighing parts for taking weight arranged.One-piece construction is simplified; By the volume of casing determination plastic of Rockfill, associated weight is obtained by weighing parts, earth pressure at rest value is obtained again by tester, relation curve between the density obtaining number of rolling and roadbed filler after calculating and the graph of relation between the density of roadbed filler and earth pressure at rest value, precision is high, without destructive, and the data of record facilitate consultation; The method is not subject to the restriction of plastic of Rockfill particle size, and the plastic of Rockfill that applicable particle diameter is less than 50 centimetres is practical.
(2) casing described in the present invention is square or rectangular structure, can meet the volume being convenient to determine casing, also can meet requirement easy to make simultaneously, practical.
(3) in the present invention, the arrangement of soil pressure cell in casing has multiple, preferably following several: the first, described soil pressure cell is 9 that are scattered in matrix pattern; The second, the quantity of described soil pressure cell is 5, and four described soil pressure cells are distributed on its surrounding with a described soil pressure cell for the center of circle, and the described soil pressure cell being in home position is arranged on the bottom centre position of described casing; 3rd, the quantity of described soil pressure cell is 10, all described soil pressure cells one-tenth the first row arranged in parallel, the second row and the third line, and wherein said the first row and the third line are symmetrical arranged about the vertical plane at the second row place; Described the first row and described the third line comprise three described soil pressure cells respectively, and described second row comprises four described soil pressure cells, and all equal with the distance between adjacent rows with the distance between adjacent two the described soil pressure cells of a line; 4th, the quantity of described soil pressure cell is 11, all described soil pressure cells one-tenth the first row arranged in parallel, the second row and the third line, and wherein said the first row and the third line are symmetrical arranged about the vertical plane at the second row place; Described the first row and described the third line comprise four described soil pressure cells respectively, and described second row comprises three described soil pressure cells, and all equal with the distance between adjacent rows with the distance between adjacent two the described soil pressure cells of a line.Installation and removal are convenient, and earth pressure at rest value precision measured when guaranteeing that different size casing adopts different arrangement mode is all very high, practical.
(4) in the present invention, all soil pressure cells are all connected with tester by electric wire, the inwall of described casing are also provided with the protection assembly for the protection of described electric wire; Described soil pressure cell is resistance-strain type soil pressure cell; The material of described casing is steel.Parts easily obtain, and the long service life of package unit.
The second object of the present invention is to provide a kind of method adopting above-mentioned density measuring equipment to measure rock-filling embankment packing density, and concrete technical scheme is as follows:
Comprise the following steps:
Step one: the determination of number of rolling, is specially:
A, the casing in density measuring equipment be placed on test site central authorities and ensure that it is smooth;
B, by inserting roadbed filler in casing to the upper limb of roadbed filler upper surface higher than casing, utilize the elevation of total station survey roadbed filler upper surface;
C, carry out i-th time and roll, wherein, i be more than or equal to 1 natural number;
If d rolls the upper limb of rear roadbed filler upper surface lower than casing, empty casing and increase the consumption of roadbed filler, returning step b, and i is reset to 1;
If roll the upper limb of rear roadbed filler upper surface higher than casing, roll the elevation Hi in face for i-th time with total station survey and make a record;
When i-th time is rolled the elevation H in face
ithe elevation H in face is rolled with the i-th-1 time
i-1when difference is more than or equal to 5mm, i=i+1, repeats step c;
When i-th time is rolled the elevation H in face
ithe elevation H in face is rolled with the i-th-1 time
i-1difference stops rolling when being less than 5mm, and obtaining number of rolling is i;
Step 2: fill up roadbed filler by the empty van body arranging soil pressure cell, guarantee that roadbed filler and casing coboundary flush; Adopt and weigh parts and take the general assembly (TW) of casing and roadbed filler and read the initial reading of soil pressure cell and record, calculate the density record that roll front roadbed filler;
Step 3: increase a certain amount of roadbed filler, makes the upper surface of roadbed filler higher than the upper edge of casing;
Step 4: adopt street roller to carry out jth time to testing field and roll, wherein j is the natural number being more than or equal to 1 and being less than or equal to i; Roadbed filler unnecessary above removing casing ensures that in casing, roadbed filler and casing coboundary flush, record earth pressure at rest value, adopt and weigh the general assembly (TW) that parts take casing and its inner roadbed filler, calculate the density of the roadbed filler after rolling and record;
Step 5: j=j+1, repeats step 3;
Step 6: the relation curve between drafting number of rolling and the density of roadbed filler and the graph of relation between the density of roadbed filler and earth pressure at rest value.
Preferred in above technical scheme, also comprise preparation process before described step 2, described preparation process is specially: adopt and weigh the net weight that parts take casing, and is placed on by casing on the road bed that rolls after leveling; In casing, place multiple soil pressure cell, and all soil pressure cells are connected with the tester be arranged on outside casing; In described step 4, the casing that roadbed filler is housed first is placed on the central authorities at testing field by street roller before rolling testing field, then adopts roadbed filler to be filled to the equal height of roadbed filler in casing the surrounding of casing; Guarantee when street roller rolls testing field in described step 4 that the roadbed filler in casing and top is full and uniform to be rolled.
Apply method of the present invention, there is following effect: during (1) the inventive method measurement rock-filling embankment density, its place election does not need to excavate the embedding casing of existing roadbed, only need to select suitable area to place casing, then field compaction test can be carried out in the position that casing surrounding roadbed filling fills as filler in casing is contour, step is easy, be easy to operation, the test period is short, has easy construction, quick, safe, economic feature; (2) the inventive method finally acquires the graph of relation between the density of relation curve between the density of number of rolling and roadbed filler and roadbed filler and earth pressure at rest value, for determining that roller compaction construction parameter provides theoretical foundation, make only to need to have buried soil pressure cell underground in advance in measured position in follow-up work progress, by the reading of soil pressure cell, the density of this position can be obtained, easy to operate, practical.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the density measuring equipment of the preferred embodiment of the present invention 1;
Fig. 2 is soil pressure cell the first distribution schematic diagram on bottom half inwall in Fig. 1;
Fig. 3 is the second distribution schematic diagram of soil pressure cell on bottom half inwall in Fig. 1;
Fig. 4 is soil pressure cell the third distribution schematic diagram on bottom half inwall in Fig. 1;
Fig. 5 is the four kind distribution schematic diagram of soil pressure cell on bottom half inwall in Fig. 1;
Fig. 6 is the graph of relation between the density of number of rolling and roadbed filler in embodiment 1;
Fig. 7 is the graph of relation between the density of roadbed filler in embodiment 1 and earth pressure at rest value;
Fig. 8 is the graph of relation between the density of number of rolling and roadbed filler in embodiment 2;
Fig. 9 is the graph of relation between the density of roadbed filler in embodiment 2 and earth pressure at rest value;
Wherein, 1, casing, 11, fine sand protective seam, 12, cable protective tube, 2, soil pressure cell, 3, tester, 4, electric wire.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can limit according to claim and cover is implemented.
Embodiment 1:
See Fig. 1 and Fig. 2, a kind of density measuring equipment, comprise without upper cover and for the casing 1 of cube structure, the multiple soil pressure cells 2 be arranged in described casing 1 bottom interior wall, be arranged on described casing 1 outer and is connected with all described soil pressure cells 2 for reading the tester 3 of all described soil pressure cell 2 data and the independent weighing parts for taking weight arranged, described weighing parts generally adopt weighbridge.
Described casing 1 is cube structure (according to actual conditions, cabinet design can also be become rectangular structure), its long and wide 200cm that is, and it is highly 100cm; The quantity of described soil pressure cell 2 is 5, four described soil pressure cells 2 with a described soil pressure cell 2 for the center of circle is distributed on its surrounding (four soil pressure cells are 50cm to the minimum perpendicular distance of wall box), the described soil pressure cell 2 being in home position is arranged on the bottom centre position of described casing 1, refers to Fig. 2.
In addition, soil pressure cell can also be arranged into following several mode by technician in the bottom interior wall of casing:
(1) refer to Fig. 3, the quantity of described soil pressure cell 2 is 9, is scattered in matrix pattern (soil pressure cell that the sidewall of distance casing is nearest is 50cm to the distance of wall box and the distance of adjacent two soil pressure cells).
(2) refer to Fig. 4, the quantity of described soil pressure cell 2 is 10, all described soil pressure cells 2 one-tenth the first row arranged in parallel, the second row and the third line, and wherein said the first row and the third line are symmetrical arranged about the vertical plane at the second row place; Described the first row and described the third line comprise three described soil pressure cells 2 respectively, described second row comprises four described soil pressure cells 2, and with the distance all equal with the distance between adjacent rows (being 50cm) between adjacent two the described soil pressure cells 2 of a line, the distance being positioned at two described soil pressure cell distance cabinet walls of end in the second row is 25cm.
(3) refer to Fig. 5, the quantity of described soil pressure cell 2 is 11, all described soil pressure cells 2 one-tenth the first row arranged in parallel, the second row and the third line, and wherein said the first row and the third line are symmetrical arranged about the vertical plane at the second row place; Described the first row and described the third line comprise four described soil pressure cells 2 respectively, described second row comprises three described soil pressure cells 2, and with the distance all equal with the distance between adjacent rows (being 50cm) between adjacent two the described soil pressure cells 2 of a line.
Soil pressure cell adopts different arrangement modes on bottom half inwall, and reading all gets the mean value of all soil pressure cell readings each time, and therefore, four kinds of modes all can meet the accuracy requirements of reality.
All described soil pressure cells 2 are all connected with tester 3 by electric wire 4, the inwall of described casing 1 are also provided with the protection assembly for the protection of described electric wire.Described protection assembly comprises and is arranged on fine sand protective seam 11 on casing 1 inwall and vertically arranges and higher than the cable protective tube 12 of casing 1 height.
Described soil pressure cell 2 adopts resistance-strain type soil pressure cell; The material of described casing 1 is steel.
Apply the method that above-mentioned density measuring equipment measures a certain section of (being designated as P1) rock-filling embankment packing density in Guizhou mountainous area, specifically comprise the following steps:
Step one: the determination of number of rolling, refers to table 1, and concrete operations are:
A, the casing in density measuring equipment be placed on test site central authorities and ensure that it is smooth;
B, by inserting roadbed filler in casing to the upper limb of roadbed filler upper surface higher than casing, utilize the elevation (sea level elevation of roadbed filler upper surface) of total station survey roadbed filler upper surface;
C, carry out i-th time and roll, wherein, i be more than or equal to 1 natural number;
If d rolls the upper limb of rear roadbed filler upper surface lower than casing, empty casing and increase the consumption of roadbed filler, returning step b, and i is reset to 1;
If roll the upper limb of rear roadbed filler upper surface higher than casing, roll the elevation Hi in face for i-th time with total station survey and make a record;
When i-th time is rolled the elevation H in face
ithe elevation H in face is rolled with the i-th-1 time
i-1when difference is more than or equal to 5mm, i=i+1, repeats step c;
When i-th time is rolled the elevation H in face
ithe elevation H in face is rolled with the i-th-1 time
i-1difference stops rolling when being less than 5mm, and obtaining number of rolling is i, and in the present embodiment 1, number of rolling i is 8;
Statistics table when table 1P1 section number of rolling is determined
| Roll parameter | The roadbed elevation (m) of filler upper surface | Roll the difference (mm) of front and back roadbed filler upper surface elevation |
| Before rolling | 1593.431 | \ |
| 1 | 1593.418 | 13 |
| 2 | 1593.400 | 18 |
| 3 | 1593.389 | 11 |
| 4 | 1593.380 | 9 |
| 5 | 1593.373 | 7 |
| 6 | 1593.367 | 6 |
| 7 | 1593.362 | 5 |
| 8 | 1593.360 | 2 |
By test, the number of rolling that we record needs is 8 times;
Step 2: fill up roadbed filler by the casing arranging soil pressure cell, guarantee that roadbed filler and casing coboundary flush; The general assembly (TW) taking casing and roadbed filler and the initial reading reading all soil pressure cells record, calculate the density record that roll front roadbed filler, concrete data refer to shown in table 2 and table 3;
Also comprising preparation process before filling up roadbed filler in the casing arranging soil pressure cell, be specially: adopt and weigh the net weight (being 2 tons) that parts take casing, and casing is placed on the road bed that rolls after leveling, in casing, place five soil pressure cells, and all soil pressure cells are connected with the tester be arranged on outside casing;
Casing is placed on the road bed that rolls after leveling concrete in the following ways: the filler below bottom half first uses excavator smooth, coordinates and manually flattens; Mark out the position of density case needs placement with pulverized limestone after leveling; Then utilize loop wheel machine that density case is moved to assigned address;
Guarantee that roadbed filler and casing coboundary flush specifically in the following ways: utilize excavator to flatten; If particle diameter is excessive, excavator is utilized to carry out fragmentation; In work progress, pave top layer time can adopt the filler that particle is relatively little;
Step 3: increase a certain amount of roadbed filler, makes the coboundary of upper surface higher than casing of roadbed filler;
Step 4: adopt street roller (preferably selecting vibroll) to carry out jth to testing field and roll, wherein j be more than or equal to 1 and be less than or equal to 8 natural number; Roadbed filler unnecessary above removing casing ensures that in casing, roadbed filler and casing coboundary flush, record earth pressure at rest value, take the general assembly (TW) of casing and its inner roadbed filler, calculate the density of the roadbed filler after rolling and record, data record refers to table 2 and table 3;
Wherein, before rolling, first the casing that roadbed filler is housed is placed on the central authorities at testing field, then adopts roadbed filler to be filled to the equal height of roadbed filler in casing the surrounding of casing; Guarantee when rolling that casing roadbed filler that is interior and top is full and uniform to be rolled;
Step 5: j=j+1, repeats step 3;
Step 6: (related data according to table 1, table 2 and table 3 is drawn for the relation curve between drafting number of rolling and the density of roadbed filler and the graph of relation between the density of roadbed filler and earth pressure at rest value, can directly draw in excel form), refer to Fig. 6 and Fig. 7.
In the present embodiment computation process, the weight of soil pressure cell, fine sand protective seam, cable protective tube, electric wire is all ignored.
The density calculation formula adopted in the inventive method is: density=mass/volume.
Table 2P1 section field test data and result of calculation
Table 3P1 section field static soil pressure force value situation of change
Embodiment 2:
The density measuring equipment that applicating adn implementing example 1 is identical measures other one section of (being designated as P2) rock-filling embankment packing density in Guizhou mountainous area, and measuring process is with embodiment 1, and measurement data and result of calculation refer to table 4 and table 5 respectively.
Table 4P2 section field test data and result of calculation
Table 5P2 section field static soil pressure force value situation of change
Draw the graph of relation between the density of relation curve between number of rolling and the density of roadbed filler and roadbed filler and earth pressure at rest value according to the related data in table 4 and table 5, concrete accompanying drawing refers to Fig. 8 and Fig. 9.
By embodiment 1 and embodiment 2, known (Fig. 6 and Fig. 8 compares, Fig. 7 and Fig. 9 compares), when other condition is identical, relation curve between the density of the relation curve between number of rolling and the density of roadbed filler and roadbed filler and earth pressure at rest value is substantially identical, and applicability is strong.The method of measurement rock-filling embankment packing density provided by the present invention is a kind of novel and easy assay method, after test once, as long as needing the some position of density measurement to place soil pressure cell in advance in follow-up construction, namely this density gone out can be obtained according to this relation curve, practical.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a density measuring equipment, it is characterized in that, comprise without upper cover and for the casing (1) of cube structure, the multiple soil pressure cells (2) be arranged in described casing (1) bottom interior wall, be arranged on that described casing (1) is connected outward and with all described soil pressure cells (2) for the tester (3) that reads all described soil pressure cell (2) data and the weighing parts for taking weight arranged separately.
2. density measuring equipment according to claim 1, is characterized in that, described casing (1) is square or rectangular structure.
3. density measuring equipment according to claim 2, is characterized in that, described soil pressure cell (2) is for being scattered in 9 of matrix pattern.
4. density measuring equipment according to claim 2, it is characterized in that, the quantity of described soil pressure cell (2) is 5, four described soil pressure cells (2) are distributed on its surrounding with a described soil pressure cell (2) for the center of circle, and the described soil pressure cell (2) being in home position is arranged on the bottom centre position of described casing (1).
5. density measuring equipment according to claim 2, it is characterized in that, the quantity of described soil pressure cell (2) is 10, all described soil pressure cells (2) one-tenth the first row arranged in parallel, the second row and the third line, wherein said the first row and the third line are symmetrical arranged about the vertical plane at the second row place; Described the first row and described the third line comprise three described soil pressure cells (2) respectively, described second row comprises four described soil pressure cells (2), and all equal with the distance between adjacent rows with the distance between adjacent two the described soil pressure cells (2) of a line.
6. density measuring equipment according to claim 2, it is characterized in that, the quantity of described soil pressure cell (2) is 11, all described soil pressure cells (2) the first row arranged in parallel, the second row and the third line, wherein said the first row and the third line are symmetrical arranged about the vertical plane at the second row place; Described the first row and described the third line comprise four described soil pressure cells (2) respectively, described second row comprises three described soil pressure cells (2), and all equal with the distance between adjacent rows with the distance between adjacent two the described soil pressure cells (2) of a line.
7. the density measuring equipment according to any one of claim 1-6; it is characterized in that; all described soil pressure cells (2) are all connected with tester (3) by electric wire (4), the inwall of described casing (1) are also provided with the protection assembly for the protection of described electric wire (4).
8. density measuring equipment according to claim 7, is characterized in that, described soil pressure cell (2) is resistance-strain type soil pressure cell; Described weighing parts are weighbridge; The material of described casing (1) is steel.
9. adopt density measuring equipment as described in claim 1-8 any one to measure a method for rock-filling embankment packing density, it is characterized in that, comprise the following steps:
Step one: the determination of number of rolling, is specially:
A, the casing in density measuring equipment be placed on test site central authorities and ensure that it is smooth;
B, by inserting roadbed filler in casing to the upper limb of roadbed filler upper surface higher than casing, measure the elevation of roadbed filler upper surface;
C, carry out i-th time and roll, wherein, i be more than or equal to 1 natural number;
If d rolls the upper limb of rear roadbed filler upper surface lower than casing, empty casing and increase the consumption of roadbed filler, returning step b, and i is reset to 1;
If roll the upper limb of rear roadbed filler upper surface higher than casing, roll the elevation Hi in face for i-th time with measurement and make a record;
When i-th time is rolled the elevation H in face
ithe elevation H in face is rolled with the i-th-1 time
i-1when difference is more than or equal to 5mm, i=i+1, repeats step c;
When i-th time is rolled the elevation H in face
ithe elevation H in face is rolled with the i-th-1 time
i-1difference stops rolling when being less than 5mm, and obtaining number of rolling is i;
Step 2: fill up roadbed filler by the empty van body arranging soil pressure cell, guarantee that roadbed filler and casing coboundary flush; Adopt and weigh parts and take the general assembly (TW) of casing and roadbed filler and read the initial reading of soil pressure cell and record, calculate the density record that roll front roadbed filler;
Step 3: increase a certain amount of roadbed filler, makes the upper surface of roadbed filler higher than the upper edge of casing;
Step 4: adopt street roller to carry out jth time to testing field and roll, wherein j is the natural number being more than or equal to 1 and being less than or equal to i; Roadbed filler unnecessary above removing casing ensures that in casing, roadbed filler and casing coboundary flush, record earth pressure at rest value, adopt and weigh the general assembly (TW) that parts take casing and its inner roadbed filler, calculate the density of the roadbed filler after rolling and record;
Step 5: j=j+1, repeats step 3;
Step 6: the relation curve between drafting number of rolling and the density of roadbed filler and the graph of relation between the density of roadbed filler and earth pressure at rest value.
10. the method for measurement rock-filling embankment packing density according to claim 9, it is characterized in that, also comprise preparation process before described step 2, described preparation process is specially: adopt and weigh parts and take the net weight of casing, and is placed on by casing on the road bed that rolls after leveling; In casing, place multiple soil pressure cell, and all soil pressure cells are connected with the tester be arranged on outside casing; In described step 4, the casing that roadbed filler is housed first is placed on the central authorities at testing field by street roller before rolling testing field, then adopts roadbed filler to be filled to the equal height of roadbed filler in casing the surrounding of casing; Guarantee when street roller rolls testing field in described step 4 that the roadbed filler in casing and top is full and uniform to be rolled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510915558.7A CN105510178B (en) | 2015-12-10 | 2015-12-10 | Density measuring equipment and the method that rock-filling embankment packing density is measured using this device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510915558.7A CN105510178B (en) | 2015-12-10 | 2015-12-10 | Density measuring equipment and the method that rock-filling embankment packing density is measured using this device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105510178A true CN105510178A (en) | 2016-04-20 |
| CN105510178B CN105510178B (en) | 2019-07-23 |
Family
ID=55718319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510915558.7A Active CN105510178B (en) | 2015-12-10 | 2015-12-10 | Density measuring equipment and the method that rock-filling embankment packing density is measured using this device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105510178B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631988A (en) * | 2019-10-08 | 2019-12-31 | 苏州方正工程技术开发检测有限公司 | Method for measuring volume of large-grain-level compact inorganic binder compacted test piece |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100172696A1 (en) * | 2008-09-02 | 2010-07-08 | The Board Of Regents Of The University Of Oklahoma | Method and apparatus for compaction of roadway materials |
| CN102345285A (en) * | 2011-07-11 | 2012-02-08 | 湖南大学 | Soil and stone mixed filling roadbed compaction degree detecting method |
| CN202421009U (en) * | 2011-12-22 | 2012-09-05 | 攀枝花环业冶金渣开发有限责任公司 | Detecting device for measuring density of solid matter |
| CN102759491A (en) * | 2012-06-20 | 2012-10-31 | 中国水电顾问集团贵阳勘测设计研究院 | Rockfill compaction density measurement method and device |
| CN103592201A (en) * | 2013-10-18 | 2014-02-19 | 中国农业大学 | Volume substitution method for measuring soil grain density and equipment |
| CN203551428U (en) * | 2013-09-10 | 2014-04-16 | 江苏省建筑工程质量检测中心有限公司 | Detection device for rockfill material dry density of rolled earth-rock dam |
| CN103776724A (en) * | 2012-10-18 | 2014-05-07 | 明光市恒大棒粉厂 | Attapulgite soil density tester |
| CN205280535U (en) * | 2015-12-10 | 2016-06-01 | 贵州省公路工程集团有限公司 | Close measuring device |
-
2015
- 2015-12-10 CN CN201510915558.7A patent/CN105510178B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100172696A1 (en) * | 2008-09-02 | 2010-07-08 | The Board Of Regents Of The University Of Oklahoma | Method and apparatus for compaction of roadway materials |
| CN102345285A (en) * | 2011-07-11 | 2012-02-08 | 湖南大学 | Soil and stone mixed filling roadbed compaction degree detecting method |
| CN202421009U (en) * | 2011-12-22 | 2012-09-05 | 攀枝花环业冶金渣开发有限责任公司 | Detecting device for measuring density of solid matter |
| CN102759491A (en) * | 2012-06-20 | 2012-10-31 | 中国水电顾问集团贵阳勘测设计研究院 | Rockfill compaction density measurement method and device |
| CN103776724A (en) * | 2012-10-18 | 2014-05-07 | 明光市恒大棒粉厂 | Attapulgite soil density tester |
| CN203551428U (en) * | 2013-09-10 | 2014-04-16 | 江苏省建筑工程质量检测中心有限公司 | Detection device for rockfill material dry density of rolled earth-rock dam |
| CN103592201A (en) * | 2013-10-18 | 2014-02-19 | 中国农业大学 | Volume substitution method for measuring soil grain density and equipment |
| CN205280535U (en) * | 2015-12-10 | 2016-06-01 | 贵州省公路工程集团有限公司 | Close measuring device |
Non-Patent Citations (4)
| Title |
|---|
| 张蓓等: "无核密度仪 (PQI) 在沥青路面施工质量控制中的应用", 《公路交通科技应用技术版》 * |
| 杨钰: "浅谈土压力盒的埋置方法", 《山西建筑》 * |
| 程珺等: "用加权平均密度法检测土石混填路基压实度", 《科学之友》 * |
| 陈春红等: "土压力盒的标定", 《中国农村水利水电》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631988A (en) * | 2019-10-08 | 2019-12-31 | 苏州方正工程技术开发检测有限公司 | Method for measuring volume of large-grain-level compact inorganic binder compacted test piece |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105510178B (en) | 2019-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102094432B (en) | Model for causing ground setting due to engineering environment effect and test method thereof | |
| CN103882894B (en) | Prestressed concrete pipe pile horizontal bearing characteristic test model and test method | |
| Bergado et al. | Full scale load test of granular piles with different densities and different proportions of gravel and sand on soft Bangkok clay | |
| Kim et al. | Deformation characteristics during construction and after impoundment of the CFRD-type Daegok Dam, Korea | |
| CN105353105B (en) | Piled Embankments midplane soil arching effect and multilayer reinforcing body membrane effect study experimental rig | |
| CN107761708A (en) | The processing method that big thickness Collapsible Loess District Subway station groundwork is reinforced | |
| CN102519811B (en) | Model and method for testing deformation and stress variation law of intensity attenuation roadbed | |
| CN102312449A (en) | Simulation long board-peg work centrifugal model and test unit and method thereof | |
| CN113463699A (en) | Vibroflotation gravel pile compactness testing device and intelligent inversion analysis method | |
| CN108535451A (en) | It a kind of box culvert-type subway station and closes on surface infrastructure and crosses over ground fissure experimental system and method | |
| CN103898929B (en) | Prestressed concrete pipe pile horizontal bearing attribute testing model and data test method | |
| CN103898930B (en) | Prestressed concrete pipe pile horizontal bearing attribute testing model and modeling method | |
| CN106592653B (en) | A kind of ponding loading test method of strip footing model | |
| CN106702999B (en) | The method of road composite foundation static load test anticipation settlement after construction | |
| CN103352482A (en) | Pile type reinforced embankment plane soil arch effect testing device | |
| CN202372418U (en) | Testing model for strength weakening roadbed deformation and stress change law | |
| CN105908690A (en) | Method for determining compaction degree of heavy tamped area and common tamped area of embankment through tamping settlement | |
| CN105510178A (en) | Density measuring equipment and method for measuring density of rockfill subgrade filler by adopting same | |
| CN205280535U (en) | Close measuring device | |
| CN101819105B (en) | Drainage test system by low-path embankment and method thereof | |
| CN111289346A (en) | Three-dimensional model test method for deformation and damage of tunnel surrounding rock containing fault fracture zone | |
| CN108645997A (en) | A kind of controlling groundwater level monitoring subgrade settlement rule test model and test method | |
| CN113742961B (en) | Construction process for taking engineering pile as supporting pile | |
| Salim et al. | The impact of driving and loading piles on existing tunnel | |
| CN114518292A (en) | Model test device and test method for high-speed railway roadbed of inclined crossing karez |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |