CN113008736A - Method for testing gradual loss of fluidity of grouting slurry laminar flow cone - Google Patents
Method for testing gradual loss of fluidity of grouting slurry laminar flow cone Download PDFInfo
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
- G01N11/06—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by timing the outflow of a known quantity
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Abstract
The invention discloses a method for testing the loss of the laminar flow cone fluidity of grouting slurry with time, and relates to the field of shield construction methods. The method is suitable for detecting the loss of the laminar flow cone fluidity of the synchronous grouting large-fluidity slurry behind the subway shield wall with time. The method can better reflect the water retention performance and the flow performance loss of the characteristic of the synchronous grouting large-fluidity slurry behind the subway shield wall. The method has high detection result accuracy, and can be widely applied to detecting the mobility of the stratified fluid of the synchronous grouting slurry behind the shield segment in the fields of railway, highway, subway and other construction engineering.
Description
Technical Field
The invention relates to the field of shield construction methods, in particular to a method for testing the loss of the fluidity of a grouting slurry layered flow cone over time.
Background
At present, a shield construction method is a main construction method adopted for constructing underwater tunnels and underground tunnels. The synchronous grouting technology behind the shield segment is a key technology in the shield method tunnel construction, and the existing back grouting has two forms, namely, the synchronous grouting is carried out by adopting a grouting hole arranged on the outer surface of a rear shell and propelling the shield; the other method is to carry out grouting through reserved grouting holes on the pipe piece. When the shield method is adopted to excavate the tunnel, because the shield outer diameter is larger than the shield segment outer diameter, after the segment is installed at the shield tail, a building gap exists between the segment and the stratum, in the construction process, the segment is adopted to carry out back grouting to fill the building gap, and the back grouting mode of the segment can adopt synchronous grouting or instant grouting.
In the stratum capable of self-stabilizing, the grouting mode has little influence on the filling rate, but in the stratum incapable of self-stabilizing, synchronous grouting is needed to be adopted, so that the grouting quantity is ensured under normal grouting pressure, the building gap is filled, the stratum is prevented from moving towards the tunnel direction, and the ground surface settlement caused by stratum stress release is reduced or controlled.
The purpose of synchronous slip casting behind the shield segment mainly includes:
(1) the stratum is filled as early as possible, the foundation settlement is reduced, and the environmental safety is ensured;
(2) the early stability of the segment lining and the sealing performance of the gap are ensured, the segment is prevented from floating upwards, and segment dislocation is reduced;
(3) the waterproof wire is used as a 1 st waterproof line for shield segment lining, and provides a long-term, homogeneous and stable waterproof function;
(4) the reinforced layer of the tunnel segment lining structure has bearing capacity.
To achieve the desired purpose of synchronous grouting, a grouting material suitable for geology and shield types is selected first. The slurry property is determined according to the specific conditions of a construction site and geology, the fluidity is suitable for grouting equipment and pipeline conditions, the construction season, the temperature of the construction site and the like, and the requirements of conveying and slurry flowing and filling at the back of a shield segment lining are met.
The current standard layering detection method comprises the steps of firstly detecting the consistency of mortar by using a mortar consistency meter, then loading the mortar into the layering meter and standing for 30min, finally detecting the consistency of the mortar at the lower half part of the layering meter, and judging the state performance of layering segregation and consistency loss of the mortar along with the time according to two consistency changes. However, due to the characteristic of synchronously grouting the high-fluidity slurry behind the wall of the subway shield, the self buoyancy is great, so that a test cone of a mortar consistency instrument is suspended in the mortar after sinking, and the detection result deviates from the actual situation, so that the existing standard layering detection method is only suitable for the water retention performance of the mortar under the condition of small consistency and is not suitable for the characteristic of synchronously grouting the high-fluidity slurry behind the wall of the subway shield.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method for testing the loss of the laminar flow cone fluidity of grouting slurry with time so as to solve the technical problem.
The invention is realized by the following steps:
a test method for the loss of the laminar flow cone fluidity of grouting slurry with time comprises the following steps: firstly, using a flow cone fluidity tester to detect the flow cone fluidity S of the slurry to be tested1Then placing the slurry to be measured in a mortar stratification instrument, vibrating on a concrete vibrating table for 5-10S, then standing, leading out the slurry with the lower part of 100mm of the mortar stratification instrument into a flow cone fluidity tester after standing is finished, and measuring the layered flow cone fluidity S of the slurry after standing2According to S2And S1The difference value of the flow rate of the layered grouting slurry is obtained, and the flow rate of the layered flow cone is lost with time.
The invention provides a test method which is suitable for detecting the flow loss of the laminar flow cone of the synchronous grouting high-fluidity slurry behind the shield wall of the subway with time. The method can better reflect the water retention performance and the flow performance loss of the characteristic of the synchronous grouting large-fluidity slurry behind the subway shield wall.
The testing method for the fluidity loss of the grouting slurry laminar flow cone over time can be widely applied to the detection of the fluidity loss of the synchronous grouting slurry laminar flow behind the shield segment in the fields of railway, highway, subway and other construction engineering.
In a preferred embodiment of the present invention, the flow cone fluidity S of the slurry to be detected is detected1The method comprises the following steps: placing the slurry to be measured in a funnel of a flow cone fluidity tester until the liquid level in the funnel reaches 1725mL +/-5 mL of scales, opening a bottom opening of the funnel, and recording the time S for the slurry to be measured in the funnel to completely flow out1And the fluidity of the flow cone of the slurry to be measured is taken as the fluidity of the flow cone of the slurry to be measured.
And the standard for judging the total outflow of the slurry to be detected takes the transparent outlet of the inverted cone as the standard.
Recording the time S of the whole outflow of the slurry to be measured1To the nearest 0.01 s. The timer is preferably a stopwatch.
In a preferred embodiment of the present invention, the step of placing the slurry to be measured in front of the funnel of the flow cone fluidity tester further comprises the step of adjusting the funnel to be horizontal by using a level gauge.
In other embodiments, calibration of the flow cone fluidity meter may also be performed prior to the measurement, for example, by reference to conventional methods known in the art.
In a preferred embodiment of the invention, the time for the slurry to be measured to stand in the mortar stratification instrument is 30min +/-1 min; the vibration frequency of the concrete vibration table is 2500-.
In the preferred embodiment of the present invention, the above-mentioned stationary slurry laminar flow cone fluidity S is measured2The method comprises the following steps: firstly, placing slurry with the thickness of 100mm below a mortar delamination apparatus in a container for uniform mixing, then pouring the uniformly mixed slurry into a cone fluidity tester until the liquid level in a funnel reaches 1725mL +/-5 mL scale, opening the bottom opening of the funnel, and recording the time S for the slurry in the funnel to flow out completely2Namely the laminar flow cone fluidity of the slurry for 30 min.
In a preferred embodiment of the present invention, the slurry to be tested is a synchronous grouting slurry to be tested.
In a preferred embodiment of the application of the present invention, the synchronous grouting slurry to be tested is prepared by mixing the following raw materials in parts by weight:
150 portions of cement, 500 portions of fly ash, 80 portions to 120 portions of calcium bentonite, 950 portions of river sand and 480 portions of water.
In other embodiments, the slurry mixing ratio of the simultaneous grouting should be adjusted according to actual needs, and is not limited to the range of the mixing ratio provided by the present invention.
In a preferred embodiment of the present invention, the river sand is river sand or machine-made sand with a fineness modulus less than 3.0.
The cement is 42.5-strength-grade ordinary portland cement which meets the regulation of GB175-2007 and meets the relevant requirements in the standard.
The fly ash is the fly ash which is in accordance with the regulation of GB/T1596-2017 fly ash for concrete.
The bentonite is the bentonite which meets the regulations of GB/T20973-2007 Bentonite.
The river sand is river sand or machine-made sand with fineness modulus less than 3.0, which meets the requirement of GB/T14684-2011 construction sand.
Test method the test environment temperature is 20 + -2 deg.C. Test method the relative humidity of the test environment is greater than 50%.
The invention has the following beneficial effects:
the invention provides a method for testing the loss of the laminar flow cone fluidity of grouting slurry with time. The method is suitable for detecting the loss of the laminar flow cone fluidity of the synchronous grouting large-fluidity slurry behind the subway shield wall with time. The method can better reflect the water retention performance and the flow performance loss of the characteristic of the synchronous grouting large-fluidity slurry behind the subway shield wall. The method has high detection result accuracy, and can be widely applied to detecting the mobility of the stratified fluid of the synchronous grouting slurry behind the shield segment in the fields of railway, highway, subway and other construction engineering.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The features and properties of the present invention are described in further detail below with reference to examples.
Provides a method for testing the loss of the laminar flow cone fluidity of grouting slurry with time.
The test materials included:
cement: 42.5 strength grade ordinary portland cement which meets the regulation of GB175-2007 and meets the relevant requirements in the standard;
fly ash: the material meets the regulation of GB/T1596-2017 fly ash for concrete;
bentonite: conforms to the regulation of GB/T20973-2007 Bentonite;
river sand: river sand or machine-made sand with fineness modulus less than 3.0, which meets the requirement of GB/T14684-2011 construction sand;
water: clean fresh water.
The test apparatus includes:
a stopwatch;
a mortar mixer;
a mortar stratification instrument;
a flow cone fluidity tester;
concrete shaking table.
And (3) testing environmental conditions: 20 plus or minus 2 ℃ and relative humidity more than 50 percent.
The test method comprises the following steps:
(1) firstly, the funnel of the flow cone fluidity tester is adjusted to be horizontal, the bottom opening is sealed, and the uniformly stirred slurry to be tested is uniformly poured into the funnel until the liquid level in the funnel reaches 1725mL +/-5 mL volume scale. Opening the bottom opening of the funnel to enable the slurry to freely flow out, and recording the time S for the slurry to completely flow out1Namely the slurry flow cone fluidity of the grouting slurry is accurate to 0.01S.
(2) And (2) filling the slurry flowing out freely in the step (1) into a mortar stratification instrument, vibrating on a concrete vibrating table for 5-10s, and then standing for 30 min. The vibration frequency of the concrete vibration table is 2860 times/minute, the amplitude is 0.3-0.6mm, the vibrator power of the concrete vibration table is 0.55kw, the table top size of the concrete vibration table is 500 x 500mm, the voltage is 220V/380V, and the larger load is 100 kg.
(3) Pouring 100mm of slurry below a mortar delamination apparatus into a container, rapidly stirring uniformly with a small spoon, rapidly pouring into a cone fluidity tester, opening the bottom opening of a funnel to allow the slurry to freely flow out, and recording the total outflow time S of the slurry2Namely the laminar flow cone fluidity of the grouting slurry is 30min, and the accuracy is 0.01S.
The calculation formula of the laminar flow cone fluidity (T) is that T is S2-S1To the nearest 0.01 s.
In the formula:
t-the flow degree of the grouting slurry layer flow cone is lost with time, and the precision is 0.01S;
S1grouting slurry flow cone fluidity is accurate to 0.01S;
S2grouting slurry for 30min, and accurately obtaining the laminar flow cone fluidity of 0.01S.
Example 1
The slurry was prepared in accordance with the blend ratio of the simultaneous grouting slurry shown in Table 1, and the initial grouting slurry flow rate S was measured by a flow rate cone meter1And then, filling the slurry into a mortar stratification instrument, vibrating on a concrete vibrating table for 5s, and then standing for 30 min. The vibration frequency of the concrete vibration table is 2860 times/minute, the amplitude is 0.3-0.6mm, the vibrator power of the concrete vibration table is 0.55kw, the table top size of the concrete vibration table is 500 x 500mm, the voltage is 220V/380V, and the larger load is 100 kg. Pouring 100mm of slurry below the mortar stratification instrument into a container, rapidly stirring uniformly with a small spoon, rapidly pouring into a cone fluidity tester, and measuring the laminar cone fluidity S of the grouting slurry for 30min2。
And calculating the time loss T of the laminar flow cone fluidity. Referring to table 2, the laminar cone flow loss over time is 0.56 s.
Table 1 slurry blend ratio for simultaneous grouting in example 1.
| Cement kg | Coal ash kg | Kg of calcium bentonite | River sand kg with fineness modulus of 1.6 | Kg of water |
| 120 | 500 | 80 | 950 | 450 |
Table 2 statistical table of flow cone fluidity and loss over time in example 1.
Example 2
The slurry was prepared at the synchronous grouting slurry mixing ratio shown in Table 3, and the initial grouting slurry fluidity S was measured by a fluidity cone fluidity measuring instrument1And then, filling the slurry into a mortar stratification instrument, vibrating on a concrete vibrating table for 10s, and then standing for 30 min. The vibration frequency of the concrete vibration table is 2860 times/minute, the amplitude is 0.3-0.6mm, the vibrator power of the concrete vibration table is 0.55kw, the table top size of the concrete vibration table is 500 x 500mm, the voltage is 220V/380V, and the larger load is 100 kg. Pouring 100mm of slurry below the mortar stratification instrument into a container, quickly stirring uniformly by a small spoon, quickly pouring into a cone fluidity tester, and measuring the laminar cone fluidity S of the grouting slurry for 30min2。
And calculating the time loss T of the laminar flow cone fluidity. Referring to table 4, the laminar cone flow loss over time is 0.54 s.
Table 3 slurry mix ratio for simultaneous grouting in example 2.
Table 4 statistical table of flow cone fluidity and loss over time in example 2.
Comparative example 1
In this example, a slurry was prepared by a conventional standard method for measuring the degree of delamination at the synchronous slip casting slurry mixing ratio shown in table 1.
The detection method comprises the following steps:
(1) firstly, the mortar consistometer is placed horizontally, and then the uniformly stirred slurry to be measured is uniformly poured into a container until the liquid level reaches 1cm from the top surface. And loosening the brake screw, moving the slide rod downwards, and when the tip of the test cone is just contacted with the surface of the mortar, tightening the brake screw to enable the lower end of the rack side rod to just contact the upper end of the slide rod, and reading the reading (accurate to 1mm) on the dial. And (3) loosening the brake screw, simultaneously timing, immediately screwing the screw at 10s, contacting the lower end of the rack measuring rod with the upper end of the sliding rod, reading the sinking depth (accurate to 1mm) from the dial, and obtaining the difference value of the secondary reading, namely the slurry consistency value 1, accurate to 1 mm.
(2) And (3) placing the slurry flowing out freely in the step (1) into a mortar stratification instrument for standing for 30 min.
(3) And (3) guiding the part of the slurry with the thickness of 100mm at the lower half part of the mortar consistometer into a small stirring pot, quickly and uniformly stirring by using a small spoon, and repeating the step (1) to obtain the slurry thickness value of 2, wherein the accuracy is 1 mm.
The loss of slurry consistency is 1-2, accurate to 1 mm.
The comparative example judges the state performance of layering segregation and consistency loss of the mortar along with the time according to the two consistency changes, and calculates the consistency loss. Referring to Table 6, the consistency loss was 5 mm.
Table 5 statistical table of consistency and loss of consistency in comparative example 1.
Comparative example 2
In this example, a slurry was prepared by a conventional standard method for measuring the degree of delamination at the synchronous slip casting slurry mixing ratio shown in table 3. The consistency loss was calculated according to the test method of comparative example 1. The results are shown in Table 6, with a consistency loss of 2 mm.
Table 6 statistical table of consistency and loss of consistency for comparative example 2.
According to the test data, the test result of the grouting slurry laminar flow cone fluidity loss test method is more accurate.
The invention provides a method for testing the loss of the laminar flow cone fluidity of grouting slurry with time. The method is suitable for detecting the loss of the laminar flow cone fluidity of the synchronous grouting large-fluidity slurry behind the subway shield wall with time. The method can better reflect the water retention performance and the flow performance loss of the characteristic of the synchronous grouting large-fluidity slurry behind the subway shield wall. The method has high detection result accuracy, and can be widely applied to detecting the mobility of the stratified fluid of the synchronous grouting slurry behind the shield segment in the fields of railway, highway, subway and other construction engineering.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A test method for the loss of the laminar flow cone fluidity of grouting slurry with time is characterized by comprising the following steps: firstly, using a flow cone fluidity tester to detect the flow cone fluidity S of the slurry to be tested1Then placing the slurry to be measured in a mortar stratification instrument, vibrating on a concrete vibrating table for 5-10S, then standing, leading out the slurry with the lower part of 100mm of the mortar stratification instrument into a flow cone fluidity tester after standing is finished, and measuring the layered flow cone fluidity S of the slurry after standing2According to S1And S2The difference value of the flow rate of the layered grouting slurry is obtained, and the flow rate of the layered flow cone is lost with time.
2. The test method according to claim 1, wherein the flow cone fluidity S of the slurry to be tested is detected1The method comprises the following steps: placing the slurry to be measured in a funnel of a flow cone fluidity tester until the liquid level in the funnel reaches 1725mL +/-5 mL of scales, opening a bottom opening of the funnel, and recording the time S for the slurry to be measured in the funnel to completely flow out1And the fluidity of the flow cone of the slurry to be measured is taken as the fluidity of the flow cone of the slurry to be measured.
3. The test method of claim 2, wherein the slurry to be tested is placed in front of the funnel of the flow cone fluidity tester, and further comprising adjusting the funnel to the level with a level gauge.
4. The test method according to claim 2, wherein the determination of the slurry laminar flow cone fluidity S after standing is carried out2The method comprises the following steps: firstly, placing slurry with the thickness of 100mm below the mortar delamination apparatus in a container for uniform mixing, then pouring the uniformly mixed slurry into a cone fluidity tester until the liquid level in the funnel reaches 1725mL +/-5 mL scale, opening the bottom opening of the funnel, and recording the time S for the slurry in the funnel to flow out completely2Namely the laminar flow cone fluidity of the slurry for 30 min.
5. The test method according to claim 1, wherein the time for the slurry to be tested to stand in the mortar stratification instrument is 30min ± 1 min; the vibration frequency of the concrete vibration table is 2500-.
6. The testing method according to claim 1, wherein the slurry to be tested is a simultaneous grouting slurry to be tested.
7. The test method as claimed in claim 6, wherein the synchronous grouting slurry to be tested is prepared by mixing the following raw materials in parts by weight:
150 portions of cement, 500 portions of fly ash, 80 portions to 120 portions of calcium bentonite, 950 portions of river sand and 480 portions of water.
8. The test method according to claim 7, wherein the river sand is river sand or machine-made sand having a fineness modulus of less than 3.0.
9. The assay method of claim 1, wherein the assay ambient temperature of the assay method is 20 ± 2 ℃.
10. The test method of claim 9, wherein the test environment relative humidity of the test method is greater than 50%.
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