CN111999178A - Tunnel sprayed concrete strength parameter in-situ test method and device - Google Patents
Tunnel sprayed concrete strength parameter in-situ test method and device Download PDFInfo
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- CN111999178A CN111999178A CN202010608836.5A CN202010608836A CN111999178A CN 111999178 A CN111999178 A CN 111999178A CN 202010608836 A CN202010608836 A CN 202010608836A CN 111999178 A CN111999178 A CN 111999178A
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- 239000011378 shotcrete Substances 0.000 title claims abstract description 164
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 21
- 238000010998 test method Methods 0.000 title claims abstract description 10
- 238000005553 drilling Methods 0.000 claims abstract description 191
- 238000012360 testing method Methods 0.000 claims abstract description 70
- 238000012423 maintenance Methods 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000004567 concrete Substances 0.000 claims abstract description 19
- 238000002474 experimental method Methods 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims 2
- 238000009472 formulation Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000011435 rock Substances 0.000 description 10
- 230000035515 penetration Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
An in-situ test method and a device for tunnel sprayed concrete strength parameters are provided, the method comprises the following steps: testing and obtaining the elastic modulus and the compressive strength of the sprayed concrete of different ages according to the specification under the condition of laboratory maintenance; drilling experiments are carried out on the sprayed concrete in different ages by adopting a drilling machine, and the drilling constant length L of the sprayed concrete in different ages is recorded0The drilling parameters of (a); establishing a relation curve of drilling parameters under the laboratory maintenance condition and the elastic modulus and the compressive strength of the sprayed concrete at different ages; the drilling test is started after the concrete is sprayed on site for a period of time, and the constant drilling length L is recorded0And recording drilling parameters per unit length along the depth direction of the drilled hole; and judging the elastic modulus and the compressive strength of the on-site sprayed concrete according to the on-site drilling parameters and the relation curve. The tunnel sprayed concrete strength parameter in-situ test method provided by the invention can be combined with experimentsThe accuracy of the room test result and the flexibility of the drilling test method.
Description
Technical Field
The invention relates to the field of tunnel engineering, in particular to an in-situ testing method for a strength parameter of tunnel sprayed concrete.
Background
The sprayed concrete support is widely applied to underground caverns such as traffic tunnels, hydraulic caverns and the like, is one of three large pillars of a 'new Austrian method', and plays a role in closing surrounding rocks in time, providing radial and tangential support force and improving the stress state of the surrounding rocks. Relevant regulations are made on early strength of sprayed concrete in relevant specifications such as railway tunnel design specification (TB10003-2016), parameters such as strength and elastic modulus of the sprayed concrete are generally tested under standard maintenance conditions of a laboratory at present, but environmental conditions in a tunnel are greatly changed, and particularly, underground water, temperature, humidity and the like have great influence on strength increase of the sprayed concrete. And the sprayed concrete is used as a supporting member, and bears the pressure of the surrounding rock from the spraying to the surrounding rock, and the early strength and the elastic modulus of the sprayed concrete have obvious influence on the stability, the deformation control and the increase characteristics of the pressure of the surrounding rock of the tunnel.
The existing resiliometer testing method cannot test the strength of concrete in the hardening process, and has large error; the pull-out method can only detect the strength of the concrete when the strength reaches more than 10 MPa; the result distortion of the sound wave testing means is serious in a severe environment; the field jack mounting method has the disadvantages of complex test process, poor timeliness and inconvenient test at the position with larger tunnel height. Therefore, special equipment and a special testing method need to be developed to carry out on-site rapid testing on the strength and the elastic modulus of the sprayed concrete so as to carry out all-around evaluation and study and judgment on the stress state of the tunnel surrounding rock and the structural support.
Disclosure of Invention
In view of the technical defects and technical drawbacks in the prior art, embodiments of the present invention provide an in-situ testing method and apparatus for tunnel shotcrete strength parameters, which overcome the above problems or at least partially solve the above problems, and the specific scheme is as follows:
as a first aspect of the present invention, there is provided an in-situ testing method for a strength parameter of tunnel shotcrete, the method including:
step 1, testing and obtaining the elastic modulus and the compressive strength of sprayed concrete of different ages according to specifications under the condition of laboratory maintenance;
step 2, drilling experiments are carried out on the sprayed concrete in different ages in the step 1 by adopting a drilling machine, and the drilling constant length L of the sprayed concrete in different ages is recorded0The drilling parameters of (a);
step 3, establishing a relation curve between the drilling parameters under the laboratory maintenance condition and the elastic modulus and the compressive strength of the sprayed concrete at different ages based on the elastic modulus, the compressive strength and the drilling parameters of the sprayed concrete at different ages obtained under the laboratory maintenance condition;
step 4, starting a drilling test after the concrete support is sprayed on site for a period of time, and recording the constant drilling length L0And recording drilling parameters per unit length along the depth direction of the drilled hole;
and 5, judging the elastic modulus and the compressive strength of the on-site sprayed concrete according to the on-site drilling parameters and the relation curves between the drilling parameters and the elastic modulus and the compressive strength of the sprayed concrete at different ages, which are established under the laboratory maintenance condition.
Further, the drilling parameters include a drilling time and/or an average drilling rate.
Further, step 1 specifically comprises:
according to a sprayed concrete formula and a sprayed concrete process of a construction site, a sprayed concrete test piece is obtained under a standard curing condition in a laboratory, and the elastic modulus E and the compressive strength R of the sprayed concrete in different ages are obtained by testing according to a testing method given in concrete structure design specifications (GB50010-2010) and geotechnical anchor rod and sprayed concrete support engineering specifications (GB 50086-2015).
Further, the drilling length is equal to the actual project sprayed concrete thickness of the construction site.
Further, the same drilling machine, drilling machine power, drilling machine pressure, drilling hole diameter and rotating speed are adopted for drilling the sprayed concrete in the laboratory and the construction site.
Further, the method further comprises: when the shotcrete is drilled, the diameter of a drill hole and the pressure of a drilling machine are selected according to the real-time strength of the shotcrete.
As a second aspect of the present invention, an in-situ testing apparatus for tunnel shotcrete strength parameters is provided, the apparatus includes a shotcrete parameter obtaining module, a first drilling parameter obtaining module, a relation curve obtaining module, a second drilling parameter obtaining module, and a field shotcrete parameter determining module;
the sprayed concrete parameter acquisition module is used for testing and acquiring the elastic modulus and the compressive strength of sprayed concrete of different ages according to specifications under the condition of laboratory maintenance;
the first drilling parameter acquisition module is used for performing drilling experiments on sprayed concrete of different ages under the laboratory maintenance condition by using a drilling machine and recording the drilling constant length L of the sprayed concrete of different ages0The drilling parameters of (a);
the relation curve acquisition module is used for establishing relation curves between the drilling parameters and the elastic modulus and the compressive strength of the sprayed concrete at different ages under the laboratory maintenance condition based on the elastic modulus, the compressive strength and the drilling parameters of the sprayed concrete at different ages obtained under the laboratory maintenance condition;
the second drilling parameter acquisition module is used for starting to perform drilling test after the concrete support is sprayed on site for a period of time and recording the constant drilling length L0And recording drilling parameters per unit length along the depth direction of the drilled hole;
and the field sprayed concrete parameter judgment module is used for judging the elastic modulus and the compressive strength of the field sprayed concrete according to the field drilling parameters and the relation curves between the drilling parameters established under the laboratory maintenance condition and the elastic modulus and the compressive strength of the sprayed concrete at different ages.
Further, the drilling parameters include a drilling time and/or an average drilling rate.
Further, the shotcrete parameter acquisition module is specifically used for acquiring a shotcrete test piece under a standard curing condition in a laboratory according to a shotcrete formula and a shotcrete process of a construction site, and testing and obtaining the elastic modulus E and the compressive strength R of shotcrete at different ages according to a testing method given in concrete structure design specifications (GB50010-2010) and geotechnical anchor rod and shotcrete support engineering technical specifications (GB 50086-2015).
Further, the same drilling machine, drilling machine power, drilling machine pressure, drilling hole diameter and rotating speed are adopted for drilling the sprayed concrete in the laboratory and the construction site.
The invention has the following beneficial effects:
the early strength of the sprayed concrete has very important influence on the stability, deformation control, surrounding rock pressure increase characteristics and the like of tunnel surrounding rocks, the existing technical means mainly comprise a resiliometer testing method, a pulling-out method, a sound wave testing method and a field jack mounting method, the existing resiliometer testing method cannot test the strength of the concrete in the hardening process, and the error is large; the pull-out method can only detect the strength of the concrete when the strength reaches more than 10 MPa; the result distortion of the sound wave testing means is serious in a severe environment; the field jack mounting method has complex test process and poor timeliness, and the test at the position with larger tunnel height is inconvenient; the intelligent drilling and testing technology provided by the invention can combine the advantages of the precision of the laboratory test result and the flexibility of the drilling and testing method.
Drawings
FIG. 1 is a flowchart of an in-situ testing method for strength parameters of tunnel shotcrete according to an embodiment of the present invention;
FIG. 2 is a graph of the relationship between drilling time and compressive strength provided by an embodiment of the present invention;
FIG. 3 is a graph of time to penetration versus modulus of elasticity provided by an embodiment of the present invention;
FIG. 4 is a graph of average rate of penetration versus compressive strength provided by an embodiment of the present invention;
FIG. 5 is a graph of average rate of penetration versus modulus of elasticity provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, as a first embodiment of the present invention, there is provided an in-situ testing method for a strength parameter of tunnel shotcrete, the method including:
step 1, testing and obtaining the elastic modulus and the compressive strength of sprayed concrete of different ages according to specifications under the condition of laboratory maintenance;
step 2, drilling experiments are carried out on the sprayed concrete in different ages in the step 1 by adopting a drilling machine, and the drilling constant length L of the sprayed concrete in different ages is recorded0The drilling parameters of (a);
step 3, establishing a relation curve between the drilling parameters under the laboratory maintenance condition and the elastic modulus and the compressive strength of the sprayed concrete at different ages based on the elastic modulus, the compressive strength and the drilling parameters of the sprayed concrete at different ages obtained under the laboratory maintenance condition;
step 4, starting a drilling test after the concrete support is sprayed on site for a period of time, and recording the constant drilling length L0And recording drilling parameters of each unit length along the depth direction of the drilled hole, wherein the drilling test is preferably started after the concrete support is sprayed on site for 1 hour;
and 5, judging the elastic modulus and the compressive strength of the on-site sprayed concrete according to the on-site drilling parameters and the relation curves between the drilling parameters and the elastic modulus and the compressive strength of the sprayed concrete at different ages, which are established under the laboratory maintenance condition.
Wherein the drilling parameters comprise drilling time and/or average drilling speed, the relation curve comprises a relation curve graph of the drilling time and the compressive strength, the relation curve graph of the drilling time and the elastic modulus is established by the drilling time of the drilling parameters obtained under the laboratory maintenance condition and the compressive strength of the sprayed concrete of different ages, the relation curve graph of the drilling time and the elastic modulus is established by the drilling time of the drilling parameters obtained under the laboratory maintenance condition and the elastic modulus of the sprayed concrete of different ages, the relation curve graph of the average drilling speed and the compressive strength is established by the average drilling speed of the drilling parameters obtained under the laboratory maintenance condition and the compressive strength of the sprayed concrete of different ages, the relation curve graph of the average drilling speed and the elastic modulus is established by the average drilling speed of the drilling parameters obtained under the laboratory maintenance condition and the elastic modulus of the sprayed concrete of different ages, as shown in fig. 2-5, the compressive strength and the elastic modulus corresponding to the time T1 and the speed V1 are found on the correlation curve by the drilling time T1 and/or the average drilling speed V1 recorded on the site, that is, the average strength and the average elastic modulus of the shotcrete on the site, and in addition, when the thickness of the shotcrete is larger, the compressive strength and the elastic modulus of the shotcrete at different depths of the same site can be judged according to the drilling time (or the drilling speed) along the unit length of the drilling depth, because the shotcrete at each site and the shotcrete at the same site are not performed at the same time.
Preferably, step 1 is specifically:
according to a sprayed concrete formula and a sprayed concrete process of a construction site, a sprayed concrete test piece is obtained under a standard curing condition in a laboratory, and the elastic modulus E and the compressive strength R of the sprayed concrete in different ages are obtained by testing according to a testing method given in concrete structure design specifications (GB50010-2010) and geotechnical anchor rod and sprayed concrete support engineering specifications (GB 50086-2015).
Preferably, the drilling length can be equal to the actual project sprayed concrete thickness of a construction site, and is generally about 10-30 cm.
Preferably, the shotcrete drilling apparatus has the following features: (1) the diameter of a drill rod of the intelligent shotcrete drilling equipment is about 5-15 mm, on the premise that the diameter of the drill rod on site is the same as that of a laboratory, the same or different drill hole diameters can be selected according to the real-time strength of the shotcrete, if the drill hole with the larger diameter is adopted when the strength is smaller, the drill hole with the smaller diameter is adopted when the strength is larger, and the same drill hole diameter can also be adopted; (2) low rotation speed, which is generally from several to several hundred revolutions per minute; (3) the power of the drilling machine is constant; (4) the pressure applied on the drill rod is constant, preferably, the pressure of the drilling machine is about 10-200N, and on the premise that the pressure of the on-site drilling machine is the same as that of a laboratory, the pressure of the drilling machine can be selected according to the real-time strength of the sprayed concrete, if the strength of the sprayed concrete is lower, smaller pressure can be adopted, and if the strength of the sprayed concrete is higher, larger pressure can be adopted; (5) various drilling parameters per unit drilling depth during the drilling process can be automatically stored and recorded.
As a second embodiment of the present invention, an in-situ testing apparatus for tunnel shotcrete strength parameters is provided, the apparatus includes a shotcrete parameter obtaining module, a first drilling parameter obtaining module, a relation curve obtaining module, a second drilling parameter obtaining module, and a field shotcrete parameter determining module;
the sprayed concrete parameter acquisition module is used for testing and acquiring the elastic modulus and the compressive strength of sprayed concrete of different ages according to specifications under the condition of laboratory maintenance;
the first drilling parameter acquisition module is used for performing drilling experiments on sprayed concrete of different ages under the laboratory maintenance condition by using a drilling machine and recording the drilling constant length L of the sprayed concrete of different ages0The drilling parameters of (a);
the relation curve acquisition module is used for establishing relation curves between the drilling parameters and the elastic modulus and the compressive strength of the sprayed concrete at different ages under the laboratory maintenance condition based on the elastic modulus, the compressive strength and the drilling parameters of the sprayed concrete at different ages obtained under the laboratory maintenance condition;
the second drilling parameter acquisition module is used for displayingStarting a drilling test after the field sprayed concrete is supported for a period of time, and recording the constant drilling length L0And recording drilling parameters per unit length along the depth direction of the drilled hole;
and the field sprayed concrete parameter judgment module is used for judging the elastic modulus and the compressive strength of the field sprayed concrete according to the field drilling parameters and the relation curves between the drilling parameters established under the laboratory maintenance condition and the elastic modulus and the compressive strength of the sprayed concrete at different ages.
Wherein the drilling parameters comprise drilling time and/or average drilling speed, the relation curve comprises a relation curve graph of the drilling time and the compressive strength, the relation curve graph of the drilling time and the elastic modulus is established by the drilling time of the drilling parameters obtained under the laboratory maintenance condition and the compressive strength of the sprayed concrete of different ages, the relation curve graph of the drilling time and the elastic modulus is established by the drilling time of the drilling parameters obtained under the laboratory maintenance condition and the elastic modulus of the sprayed concrete of different ages, the relation curve graph of the average drilling speed and the compressive strength is established by the average drilling speed of the drilling parameters obtained under the laboratory maintenance condition and the compressive strength of the sprayed concrete of different ages, the relation curve graph of the average drilling speed and the elastic modulus is established by the average drilling speed of the drilling parameters obtained under the laboratory maintenance condition and the elastic modulus of the sprayed concrete of different ages, as shown in fig. 2-5, the compressive strength and the elastic modulus corresponding to the time T1 and the speed V1 are found on the correlation curve by the drilling time T1 and/or the average drilling speed V1 recorded on the site, that is, the average strength and the average elastic modulus of the shotcrete on the site, and in addition, when the thickness of the shotcrete is larger, the compressive strength and the elastic modulus of the shotcrete at different depths of the same site can be judged according to the drilling time (or the drilling speed) along the unit length of the drilling depth, because the shotcrete at each site and the shotcrete at the same site are not performed at the same time.
Preferably, the shotcrete parameter acquisition module is specifically used for acquiring a shotcrete test piece under a standard curing condition in a laboratory according to a shotcrete formula and a shotcrete process of a construction site, and testing and obtaining the elastic modulus E and the compressive strength R of shotcrete at different ages according to a testing method given in concrete structure design specifications (GB50010-2010) and geotechnical anchor rod and shotcrete support engineering technical specifications (GB 50086-2015).
Preferably, the shotcrete drilling apparatus has the following features: (1) the diameter of a drill rod of the intelligent shotcrete drilling equipment is about 5-15 mm, on the premise that the diameter of the drill rod on site is the same as that of a laboratory, the same or different drill hole diameters can be selected according to the real-time strength of the shotcrete, if the drill hole with the larger diameter is adopted when the strength is smaller, the drill hole with the smaller diameter is adopted when the strength is larger, and the same drill hole diameter can also be adopted; (2) low rotation speed, which is generally from several to several hundred revolutions per minute; (3) the power of the drilling machine is constant; (4) the pressure applied on the drill rod is constant, preferably, the pressure of the drilling machine is about 10-200N, and on the premise that the pressure of the on-site drilling machine is the same as that of a laboratory, the pressure of the drilling machine can be selected according to the real-time strength of the sprayed concrete, if the strength of the sprayed concrete is lower, smaller pressure can be adopted, and if the strength of the sprayed concrete is higher, larger pressure can be adopted; (5) various drilling parameters per unit drilling depth during the drilling process can be automatically stored and recorded.
The early strength of the sprayed concrete has very important influence on the stability, deformation control, surrounding rock pressure increase characteristics and the like of tunnel surrounding rocks, the existing technical means mainly comprise a resiliometer testing method, a pulling-out method, a sound wave testing method and a field jack mounting method, the existing resiliometer testing method cannot test the strength of the concrete in the hardening process, and the error is large; the pull-out method can only detect the strength of the concrete when the strength reaches more than 10 MPa; the result distortion of the sound wave testing means is serious in a severe environment; the field jack mounting method has the disadvantages of complex test process, poor timeliness and inconvenient test at the position with larger tunnel height. The intelligent drilling and testing technology provided by the invention can combine the advantages of the precision of the laboratory test result and the flexibility of the drilling and testing method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An in-situ testing method for tunnel sprayed concrete strength parameters is characterized by comprising the following steps:
step 1, testing and obtaining the elastic modulus and the compressive strength of sprayed concrete of different ages according to specifications under the condition of laboratory maintenance;
step 2, drilling experiments are carried out on the sprayed concrete in different ages in the step 1 by adopting a drilling machine, and the drilling constant length L of the sprayed concrete in different ages is recorded0The drilling parameters of (a);
step 3, establishing a relation curve between the drilling parameters under the laboratory maintenance condition and the elastic modulus and the compressive strength of the sprayed concrete at different ages based on the elastic modulus, the compressive strength and the drilling parameters of the sprayed concrete at different ages obtained under the laboratory maintenance condition;
step 4, starting a drilling test after the concrete support is sprayed on site for a period of time, and recording the constant drilling length L0And recording drilling parameters per unit length along the depth direction of the drilled hole;
and 5, judging the elastic modulus and the compressive strength of the on-site sprayed concrete according to the on-site drilling parameters and the relation curves between the drilling parameters and the elastic modulus and the compressive strength of the sprayed concrete at different ages, which are established under the laboratory maintenance condition.
2. The in-situ testing method for tunnel shotcrete strength parameters of claim 1, wherein the drilling parameters include drilling time and/or average drilling rate.
3. The in-situ test method for the strength parameters of the tunnel shotcrete according to claim 1, wherein the step 1 specifically comprises:
according to a sprayed concrete formula and a sprayed concrete process of a construction site, a sprayed concrete test piece is obtained under a standard curing condition in a laboratory, and the elastic modulus E and the compressive strength R of sprayed concrete in different ages are obtained by testing according to a test method given in concrete structure design specifications and rock-soil anchor rod and sprayed concrete support engineering specifications.
4. The in-situ test method for the strength parameter of the tunnel shotcrete is characterized in that the drilling length is equal to the actual project shotcrete thickness of a construction site.
5. The in-situ test method for the strength parameters of the sprayed concrete in the tunnel according to claim 1, wherein the drilling of the sprayed concrete is carried out in a laboratory and a construction site by using the same drilling machine, drilling machine power, drilling machine pressure, drilling hole diameter and rotating speed.
6. The in-situ test method for the strength parameters of the tunnel shotcrete according to claim 1, further comprising: when the shotcrete is drilled, the diameter of a drill hole and the pressure of a drilling machine are selected according to the real-time strength of the shotcrete.
7. The in-situ testing device for the tunnel sprayed concrete strength parameters is characterized by comprising a sprayed concrete parameter obtaining module, a first drilling parameter obtaining module, a relation curve obtaining module, a second drilling parameter obtaining module and a field sprayed concrete parameter judging module;
the sprayed concrete parameter acquisition module is used for testing and acquiring the elastic modulus and the compressive strength of sprayed concrete of different ages according to specifications under the condition of laboratory maintenance;
the first drilling parameter acquisition module is used for performing drilling experiments on sprayed concrete of different ages under the laboratory maintenance condition by using a drilling machine and recording the drilling constant length L of the sprayed concrete of different ages0The drilling parameters of (a);
the relation curve acquisition module is used for establishing relation curves between the drilling parameters and the elastic modulus and the compressive strength of the sprayed concrete at different ages under the laboratory maintenance condition based on the elastic modulus, the compressive strength and the drilling parameters of the sprayed concrete at different ages obtained under the laboratory maintenance condition;
the second drilling parameter acquisition module is used for starting to perform drilling test after the concrete support is sprayed on site for a period of time and recording the constant drilling length L0And recording drilling parameters per unit length along the depth direction of the drilled hole;
and the field sprayed concrete parameter judgment module is used for judging the elastic modulus and the compressive strength of the field sprayed concrete according to the field drilling parameters and the relation curves between the drilling parameters established under the laboratory maintenance condition and the elastic modulus and the compressive strength of the sprayed concrete at different ages.
8. The in-situ testing device for the tunnel shotcrete strength parameter of claim 7, wherein the drilling parameters include a drilling time and/or an average drilling speed.
9. The in-situ testing device for the tunnel shotcrete strength parameter according to claim 7, wherein the shotcrete parameter acquiring module is specifically configured to acquire a shotcrete specimen under a standard laboratory curing condition according to a shotcrete formulation and a shotcrete process at a construction site, and test and obtain the elastic modulus E and the compressive strength R of shotcrete at different ages according to a testing method given in concrete structure design specifications and rock-soil anchor rod and shotcrete support engineering specifications.
10. The in-situ testing device for the strength parameters of the sprayed concrete in the tunnel according to claim 7, wherein the drilling machine, the drilling machine power, the drilling machine pressure, the drilling hole diameter and the rotating speed which are the same are adopted for drilling the sprayed concrete in a laboratory and a construction site.
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| CN202010608836.5A CN111999178A (en) | 2020-06-30 | 2020-06-30 | Tunnel sprayed concrete strength parameter in-situ test method and device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305740A (en) * | 2011-08-03 | 2012-01-04 | 安徽省（水利部淮河水利委员会）水利科学研究院 | Detection method of compression strength of concrete structure |
| JP2013124443A (en) * | 2011-12-13 | 2013-06-24 | Takenaka Doboku Co Ltd | Quality evaluation method for cement improvement ground |
| JP2014021050A (en) * | 2012-07-23 | 2014-02-03 | Nishimatsu Constr Co Ltd | Data acquisition device, strength measurement system, data acquisition method and strength measurement method |
| JP2015212637A (en) * | 2014-05-01 | 2015-11-26 | 株式会社ティ・エス・プランニング | Concrete strength estimation method and concrete strength estimation system |
| CN107941612A (en) * | 2017-11-14 | 2018-04-20 | 中国水利水电科学研究院 | A kind of method for measuring concrete early stage elasticity modulus |
-
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- 2020-06-30 CN CN202010608836.5A patent/CN111999178A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305740A (en) * | 2011-08-03 | 2012-01-04 | 安徽省（水利部淮河水利委员会）水利科学研究院 | Detection method of compression strength of concrete structure |
| JP2013124443A (en) * | 2011-12-13 | 2013-06-24 | Takenaka Doboku Co Ltd | Quality evaluation method for cement improvement ground |
| JP2014021050A (en) * | 2012-07-23 | 2014-02-03 | Nishimatsu Constr Co Ltd | Data acquisition device, strength measurement system, data acquisition method and strength measurement method |
| JP2015212637A (en) * | 2014-05-01 | 2015-11-26 | 株式会社ティ・エス・プランニング | Concrete strength estimation method and concrete strength estimation system |
| CN107941612A (en) * | 2017-11-14 | 2018-04-20 | 中国水利水电科学研究院 | A kind of method for measuring concrete early stage elasticity modulus |
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Application publication date: 20201127 |