CN115247562A - Foam muck improvement method suitable for shield construction of silty-fine sand stratum - Google Patents
Foam muck improvement method suitable for shield construction of silty-fine sand stratum Download PDFInfo
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- CN115247562A CN115247562A CN202210863966.2A CN202210863966A CN115247562A CN 115247562 A CN115247562 A CN 115247562A CN 202210863966 A CN202210863966 A CN 202210863966A CN 115247562 A CN115247562 A CN 115247562A
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- 239000006260 foam Substances 0.000 title claims abstract description 77
- 239000004576 sand Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 230000006872 improvement Effects 0.000 title claims abstract description 18
- 239000002689 soil Substances 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 230000005641 tunneling Effects 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 238000005192 partition Methods 0.000 claims abstract description 4
- 239000004088 foaming agent Substances 0.000 claims description 12
- 238000009412 basement excavation Methods 0.000 claims description 11
- 238000005187 foaming Methods 0.000 claims description 8
- 239000004604 Blowing Agent Substances 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 1
- 239000002893 slag Substances 0.000 abstract description 6
- 238000011156 evaluation Methods 0.000 abstract description 4
- 238000010079 rubber tapping Methods 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000326 densiometry Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Soil Sciences (AREA)
- Structural Engineering (AREA)
- Computational Mathematics (AREA)
- Architecture (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Evolutionary Computation (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention belongs to the technical field of shield construction, and provides a foam muck improvement method suitable for shield construction of a silty-fine sand stratum, which comprises the following steps: s1, injecting a certain amount of water into a shield soil bin to enable the moisture content of the muck to be within a preset range; s2, adding foam liquid prepared according to the moisture content of the muck through a soil bin partition plate and a nozzle on a cutter head; the adding rate of the foam liquid is determined according to the consistency value C and the slump value T when the muck is at the target water content, and the adding rate is the volume of the foam liquid which needs to be injected in each tunneling ring of the shield; s3, monitoring the state of the muck during tunneling in the fine sand stratum, and adjusting the injection ratio of the foam liquid according to the state of the muck; and when the foam residue soil parameter of the fine sand stratum shield meets a preset value, determining that the residue soil meets the improvement requirement. The consistency and the slump are used as evaluation indexes, so that the influence of the consistency and the slump in the construction of the silty-fine sand stratum is considered, and the problems of difficult shield slag tapping and serious cutter head and cutter wear can be effectively solved.
Description
Technical Field
The invention relates to the technical field of shield construction, in particular to a foam muck improvement method suitable for shield construction of a silty-fine sand stratum.
Background
With the acceleration of the urbanization process, urban subway facilities are rapidly developed as the key points for developing and utilizing underground spaces. The urban subway construction method is often an open excavation method and an underground excavation method, wherein the underground excavation method comprises a pipe jacking method and a shield method, and the shield method is widely used due to the fact that the construction speed is high, the influence on the surrounding environment is small, and the construction process is relatively simple. Due to the fact that sandy soil, silt and fine silt have the characteristics of large internal friction angle, poor flow plasticity and the like, when the shield tunnels in a fine silt stratum, the problems of difficulty in digging out soil, serious abrasion of a cutter head cutter and the like are often encountered, so that the thrust and torque fluctuation of the cutter head of the shield are large, the tunneling speed is slow, and meanwhile large disturbance is generated on surrounding soil bodies, so that soil body improvement is increasingly emphasized, and the fact that the soil body has good flow plasticity in construction is an important guarantee for smooth and efficient tunneling of a soil pressure balance shield.
At present, the shield muck improvement technology is mainly focused on a sand-gravel layer and a clay layer, the research on a fine sand layer is less, and when a shield is tunneled in the fine sand layer, a series of problems that the water stop requirement cannot be met, the shield is difficult to slag, the sensitivity of the layer to the pressure of a soil bin during excavation is high, the abrasion to a cutter head cutter is serious and the like are caused due to the large internal friction angle, the large permeability coefficient, the low compressibility and the poor flow plasticity of the sand and the fine sand are adopted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a foam muck improvement method suitable for shield construction of a fine sand stratum, and aims to solve the problems that the shield of the fine sand stratum is difficult to slag, the stratum has high sensitivity to the pressure of a soil bin during excavation and a cutter head cutter is seriously abraded when shield construction is carried out due to the fact that the existing shield muck improvement method is mainly concentrated on sand pebble and clay strata and the fine sand stratum is lack of research on the fine sand stratum.
The invention provides a foam muck improvement method suitable for shield construction of a silty-fine sand stratum, which comprises the following steps:
s1, injecting a certain amount of water into a shield soil bin to enable the moisture content of the muck to be within a preset range;
s2, adding foam liquid prepared according to the moisture content of the muck through a soil bin partition plate and a nozzle on a cutter head; the adding rate of the foam liquid is determined according to the consistency value C and the slump value T when the muck is at the target water content, and the adding rate is the volume of the foam liquid required to be injected in each tunneling ring of the shield;
s3, monitoring the state of the muck during tunneling in the fine sand stratum, and adjusting the injection ratio of the foam liquid according to the state of the muck; and when the foam residue soil parameter of the fine sand stratum shield meets a preset value, determining that the residue soil meets the improvement requirement.
According to the technical scheme, the foam muck improvement method suitable for shield construction of the silty-fine sand stratum provided by the invention is characterized in that the consistency and the slump are used as evaluation indexes aiming at the characteristics of large internal friction angle and poor flow plasticity of the silty-fine sand stratum, so that the problems of difficult slag discharge of the shield and serious abrasion of a cutter head cutter can be effectively solved.
Optionally, in step S1, in order to keep the water content of the residue soil within a preset range, the water injection amount into the shield soil bin is determined according to the following formula, and m is L In order to inject water into the shield soil bin,
wherein m is s Is the mass of each ring of muck, w s The current moisture content of the residue soil is shown, and the w is the target moisture content of the improved residue soil.
Optionally, step S2 includes:
respectively establishing a relation model of the consistency value C, the muck water content w and the foam external doping amount FIR, and a relation model of the slump value T, the muck water content w and the foam external doping amount FIR;
acquiring a foam external admixture FIR (finite impulse response) when the consistency value C, the slump value T and the muck water content w are within preset ranges;
according to the foam external mixing amount FIR and the volume V of each ring of dregs s Determining the volume V of the foam liquid required to be added in each tunneling ring of the shield f 。
Optionally, the relational model expression of the consistency value C, the muck water content w and the foam external doping amount FIR is
C＝30.7FIR 2 -302.75w 2 +242.05w+10.96FIR-41.08；
The relational model expression of the slump value T, the residue soil water content w and the foam external doping amount FIR is
T＝86.8FIR 2 -1272.64w 2 +902.12w+20.28FIR-148.56；
Wherein C is a consistency value, T is a slump value, FIR is a foam external mixing amount, and w is a residue soil water content.
Optionally, the volume V of the foam liquid to be added for each tunneling ring of the shield f As determined by the following formula,
V f ＝V S ×FIR，
wherein the volume of each ring of dregs
D is the diameter/m of shield excavation, L is the width/m of each ring pipe piece, and epsilon is the loose coefficient of the residue soil.
Optionally, step S2 further includes:
according to the volume V of the foam liquid which needs to be added for each tunneling ring of the shield f Determining each diggingBlowing agent volume V required for one-ring blowing g (ii) a Wherein the content of the first and second substances,
w is the volume fraction of the foam liquid, and EFR' is the foaming ratio of the foaming agent under the soil bin pressure P.
Alternatively, the foaming ratio EFR' of the foaming agent at the soil bin pressure P is determined according to the following formula,
wherein FER is standard atmospheric pressure P 0 The following expansion ratio.
By adopting the technical scheme, the application has the following beneficial effects:
according to the invention, aiming at the characteristics of large internal friction angle and poor flow plasticity of the silty-fine sand stratum, the consistency and the slump are used as evaluation indexes, and from two dimensions of the consistency and the slump, a relational model expression of foam external mixing amount FIR and a consistency value C and a relational model expression of the foam external mixing amount FIR and the slump value T are formed aiming at silty-fine sand stratum muck, so that the influence of the consistency and the slump during construction of the silty-fine sand stratum is considered, the flow plasticity of the muck is determined by the consistency, and the sensitivity of the stratum to the earth bin pressure during excavation is determined by the slump, and the problems of difficult shield slag tapping and serious abrasion of a cutter head cutter can be effectively solved.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 shows a flow chart of a foam muck improvement method suitable for shield construction of a silty-fine sand stratum according to an embodiment of the present invention;
fig. 2 shows a flow chart of a foam muck improvement method suitable for shield construction of a silty-fine sand stratum provided by the embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
The shield muck of the embodiment is taken from a shield interval of a No. 2 line of the Nantong city rail transit, the diameter D of a tunnel of the shield interval is 6.2m, the width L of each ring pipe sheet is 1.2m, the pressure P of a shield soil bin is about 1.5bar, the soil-taking stratum is a silt and sandy silt stratum, the natural water content is measured to be 25% by field sampling, and the uneven coefficient Cu and the curvature coefficient CC of the silt are respectively 2.39 and 0.99 by geotechnical tests such as a screening method, a densitometry method and the like. According to the geotechnical test regulations, the soil with good gradation is determined when the nonuniform coefficient Cu is more than or equal to 5 and the curvature coefficient CC is more than or equal to 1 and less than or equal to 3, and the soil with good gradation is determined when the nonuniform coefficient Cu is less than or equal to 3. According to the test result, the shield muck of the embodiment is determined to be poor-graded fine silt, so that the shield muck needs to be improved.
Fig. 1 shows a flow chart of a foam muck improving method suitable for shield construction of a silty-fine sand stratum according to an embodiment of the present invention. As shown in fig. 1, a method for improving foam muck suitable for shield construction of a fine sand stratum according to an embodiment of the present invention includes:
s1, injecting a certain amount of water into the shield soil bin to enable the moisture content of the muck to be within a preset range.
In step S1, in order to ensure that the water content of the muck is within a preset range, the water injection amount into the shield soil bin is determined according to the following formula, and m is L In order to inject water into the shield soil bin,
in the above formula, m s Is the mass of each ring of muck, w s The current moisture content of the muck, namely the natural moisture content is 25%, and w is the target moisture content of the improved muck, namely the optimal moisture content of the muck in the embodiment is predetermined to be 32.5%. Based on the formula, the water injection volume of 2.4m is further obtained by determining the water injection amount into the shield soil bin 3 。
S2, adding foam liquid prepared according to the moisture content of the muck through a soil bin partition plate and a nozzle on a cutter head; the adding rate of the foam liquid is determined according to the consistency value C and the slump value T when the muck is at the target water content, and the adding rate is the volume of the foam liquid which needs to be injected when the shield tunnels one ring.
As shown in fig. 2, step S2 specifically includes:
s201, respectively establishing a relation model of the consistency value C, the muck water content w and the foam external doping amount FIR, and a relation model of the slump value T, the muck water content w and the foam external doping amount FIR.
Specifically, the relational model expression of the density value C, the muck water content w and the foam external doping amount FIR is
C＝30.7FIR 2 -302.75w 2 +242.05w+10.96FIR-41.08；
The relational model expression of the slump value T, the residue soil water content w and the foam external mixing amount FIR is
T＝86.8FIR 2 -1272.64w 2 +902.12w+20.28FIR-148.56；
Wherein C is a consistency value, T is a slump value, FIR is a foam external mixing amount, and w is a residue soil water content.
S202, obtaining the foam external admixture FIR when the consistency value C, the slump value T and the muck water content w are within the preset range.
Through the prior measurement, the range of the consistency value C is 8-10cm, the range of the slump value T is 15-20cm, so that the measured foam external mixing amount FIR and the predetermined improved muck target water content w are 32.5%, and the determined target foam external mixing amount FIR is 15%.
S203, according to the foam external mixing amount FIR and the volume V of each ring of dregs s Determining shield tunnelingThe volume V of the foam liquid needing to be added in one cycle f 。
Based on the determined target foam external doping amount FIR, the volume V of the foam liquid which needs to be added every time the shield tunnels one ring f As determined by the following formula,
V f ＝V S ×FIR，
wherein the volume of each ring of dregs
D is the diameter/m of shield excavation, L is the width/m of each circular pipe sheet, and epsilon is the loose coefficient of the muck. In this embodiment, the volume V of dregs per ring s Is 40.56m 3 The volume V of the foam liquid which needs to be added every time the shield tunnels one ring f Is 6.08m 3 The loose coefficient epsilon of the residue soil is 1.12.
According to the embodiment, aiming at the characteristics of large internal friction angle and poor fluidity and plasticity of the silty-fine sand stratum, the consistency and the slump are used as evaluation indexes, from two dimensions of the consistency and the slump, a relational model expression of the foam external mixing amount FIR and the consistency value C and the foam external mixing amount FIR and the slump value T is formed for silty-fine sand stratum muck, the influence of the consistency and the slump during construction of the silty-fine sand stratum is considered, the fluidity and plasticity of the muck are determined by the consistency, the sensitivity of the stratum to the pressure of a soil bin during excavation is determined by the slump, and through the two indexes, the problems of difficult slag discharging of the shield and serious abrasion of a cutter head cutter can be effectively solved.
In one possible embodiment, step S2 further includes:
according to the volume V of the foam liquid which needs to be added for each tunneling ring of the shield f Determining the volume V of blowing agent required for one ring per tunnelling g (ii) a Wherein, the first and the second end of the pipe are connected with each other,
w is the volume fraction of the foaming agent in the foam liquid, and EFR' is the foaming ratio of the foaming agent at the soil bin pressure P.
Alternatively, the expansion ratio EFR' of the foaming agent at the soil bin pressure P is determined according to the following formula,
wherein FER is standard atmospheric pressure P 0 The following expansion ratio.
Volume fraction W of foaming agent in foam liquid and standard atmospheric pressure P 0 The foaming ratio FER of the lower foaming agent depends on the properties of the foaming agent, the volume fraction W =3% in the embodiment, the foaming ratio EFR' is 11.5 when the current soil bin pressure P is 1.5bar, and the volume V of the foaming agent required by each tunneling ring is g Is 1.59X 10 -2 m 3 。
S3, monitoring the state of the muck during tunneling in the fine sand stratum, and adjusting the injection ratio of the foam liquid according to the state of the muck; and when the foam residue soil parameter of the fine sand stratum shield meets a preset value, determining that the residue soil meets the improvement requirement.
Based on the method of the embodiment, the optimal foam muck improvement parameters of the fine sand stratum shield in the current construction environment are as follows: the water content w of the muck is =32.5%, the foam admixture amount FIR is =15%, the foaming ratio of the foaming agent is maintained at about 12 times, the half-life period is about 10min, the slump value of the improved muck is about 16.5cm, the requirement of a section of 15-20cm is met, and when no water and foam separation phenomenon occurs, the muck has good flow plasticity and can well meet the shield construction requirement.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A foam muck improvement method suitable for shield construction of a silty-fine sand stratum is characterized by comprising the following steps:
s1, injecting a certain amount of water into a shield soil bin to enable the moisture content of the muck to be within a preset range;
s2, adding foam liquid prepared according to the moisture content of the muck through a soil bin partition plate and a nozzle on a cutter head; the adding rate of the foam liquid is determined according to the consistency value C and the slump value T when the muck is at the target water content, and the adding rate is the volume of the foam liquid which needs to be injected when the shield tunnels one ring;
s3, monitoring the state of the muck during tunneling in the fine sand stratum, and adjusting the injection ratio of the foam liquid according to the state of the muck; and when the foam residue soil parameter of the fine sand stratum shield meets a preset value, determining that the residue soil meets the improvement requirement.
2. The method according to claim 1, wherein the water injection amount into the shield soil silo in step S1 is determined according to the following formula in order to keep the water content of the muck within a preset range, and m is L In order to inject water into the shield soil bin,
wherein m is s Is the mass of each ring of muck, w s The current moisture content of the residue soil is shown, and the w is the target moisture content of the improved residue soil.
3. The method according to claim 1, wherein step S2 comprises:
respectively establishing a relation model of the consistency value C, the muck water content w and the foam external doping amount FIR, and a relation model of the slump value T, the muck water content w and the foam external doping amount FIR;
acquiring a foam external admixture FIR (finite impulse response) when the consistency value C, the slump value T and the muck water content w are within preset ranges;
according to the foam external mixing amount FIR and the volume V of each ring of dregs s Determining the volume V of the foam liquid required to be added in each tunneling ring of the shield f 。
4. The method as claimed in claim 3, wherein the relational model expression of the consistency value C, the muck water content w and the foam external doping amount FIR is
C＝30.7FIR 2 -302.75w 2 +242.05w+10.96FIR-41.08；
The relational model expression of the slump value T, the residue soil water content w and the foam external doping amount FIR is
T＝86.8FIR 2 -1272.64w 2 +902.12w+20.28FIR-148.56；
Wherein C is a consistency value, T is a slump value, FIR is a foam external mixing amount, and w is a residue soil water content.
5. The method of claim 3 wherein the shield is constructed to add a volume V of foam concentrate for each ring of excavation f As determined by the following formula,
V f ＝V S ×FIR，
wherein the volume of each ring of dregs
D is the diameter/m of shield excavation, L is the width/m of each circular pipe sheet, and epsilon is the loose coefficient of the muck.
6. The method of claim 5, wherein step S2 further comprises:
according to the volume V of the foam liquid which needs to be added for each tunneling ring of the shield f Determining the volume V of blowing agent required for one ring per tunnelling g (ii) a Wherein the content of the first and second substances,
w is the volume fraction of the foam liquid, and EFR' is the foaming ratio of the foaming agent under the soil bin pressure P.
7. The method according to claim 6, wherein the foaming ratio EFR' of the foaming agent at the soil bin pressure P is determined according to the following formula,
wherein FER is standard atmospheric pressure P 0 The following expansion ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210863966.2A CN115247562A (en) | 2022-07-21 | 2022-07-21 | Foam muck improvement method suitable for shield construction of silty-fine sand stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210863966.2A CN115247562A (en) | 2022-07-21 | 2022-07-21 | Foam muck improvement method suitable for shield construction of silty-fine sand stratum |
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| CN115247562A true CN115247562A (en) | 2022-10-28 |
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| CN202210863966.2A Pending CN115247562A (en) | 2022-07-21 | 2022-07-21 | Foam muck improvement method suitable for shield construction of silty-fine sand stratum |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116698624A (en) * | 2023-07-20 | 2023-09-05 | 山东大学 | Test method and system for improving internal friction angle and cohesive force of soil by foam |
| CN116698624B (en) * | 2023-07-20 | 2024-05-31 | 山东大学 | Test method and system for improving internal friction angle and cohesive force of soil by foam |
-
2022
- 2022-07-21 CN CN202210863966.2A patent/CN115247562A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116698624A (en) * | 2023-07-20 | 2023-09-05 | 山东大学 | Test method and system for improving internal friction angle and cohesive force of soil by foam |
| CN116698624B (en) * | 2023-07-20 | 2024-05-31 | 山东大学 | Test method and system for improving internal friction angle and cohesive force of soil by foam |
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