CN109487772A - A kind of sound detecting pipe distribution method of air bubble mix light-textured soil roadbed - Google Patents
A kind of sound detecting pipe distribution method of air bubble mix light-textured soil roadbed Download PDFInfo
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- CN109487772A CN109487772A CN201811633279.1A CN201811633279A CN109487772A CN 109487772 A CN109487772 A CN 109487772A CN 201811633279 A CN201811633279 A CN 201811633279A CN 109487772 A CN109487772 A CN 109487772A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
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Abstract
The invention discloses a kind of sound detecting pipe distribution methods of air bubble mix light-textured soil roadbed；Sound detecting pipe vertically or is laterally buried according to field condition selection first, then the steel mesh in roadbed is searched for, confirmation judges steel mesh position, steel mesh is avoided to drill through the instrument connection of different spacing and bury sound detecting pipe progress ultrasound detection, suitable ranging is selected according to ultrasonic testing results, lays test point at a certain distance on roadbed, drills through 4 detection holes in " ten " font centered on test point, embedded sound detecting pipe is used for ultrasound detection, avoids steel mesh when drilling through detection hole.The present invention can lay sound detecting pipe in air bubble mix light-textured soil roadbed under the premise of not destroying pavement structure, quality for ultrasound detection roadbed, and execute-in-place is simple and fast, does not influence normally being open to traffic for road surface, moreover it is possible in the quality testing applied to the low-intensity roadbed filling of other types.
Description
Technical field
The invention belongs to civil engineering technical field of quality detection, and in particular to a kind of sound of air bubble mix light-textured soil roadbed
Test tube distribution method.
Background technique
Air bubble mix light-textured soil is usually used in the roadbed filling of some special road sections as a kind of novel rock-soil material, such as soft
Soil base section, end of the bridge transition section or in order to avoid causing valve pit subsidence to roll work without can be carried out existed building around
The section of industry.Air bubble mix light-textured soil has the characteristics that lightweight, high-strength, good fluidity, and being applied to have in embankment can be with
Soil body load is effectively reduced, reduces the advantages that subgrade settlement deformation and solving problem of vehicle bump at bridge head.Existing standard and technology rule
It in journey and do not set up the air bubble mix light-textured soil quality control of system, check and accept, evaluation index and system, it is light to affect bubble mixing
A kind of promotion and application of the matter soil as novel rock-soil material.
Ultrasonic detecting technology has many advantages, such as that equipment carrying portable, equipment price are low, easy to detect quick, has incited somebody to action both at home and abroad
It is widely used in concrete NDT, and achieves ideal achievement.Velocity of wave of the ultrasonic wave in concrete and its intensity it
Between have certain relevance, can by foundation " intensity-velocity of wave " curve be used to calculate concrete strength, this method is applied more
It is detected in pile measurement and concrete filled steel tube.Compared with concrete, the material of air bubble mix light-textured soil only has cement, influences ultrasound
The factor of detection is less, and testing result is more reliable.
Has the correlative study that ultrasound detection is applied to the quality testing of air bubble mix light-textured soil roadbed at present, such as specially
A kind of benefit --- air bubble mix light-textured soil embankment lossless detection method (publication number: 107870201A).The method that the patent uses
It is to bury sound detecting pipe in advance before air bubble mix light-textured soil roadbed pours, therefore it can not be to the air bubble mix light-textured soil road in operation
Base is detected.It is used to test gas there are also a kind of static pressure coring method (patent No.: ZL201410183350.6) in engineering construction
Steep mix light-textured soil intensity, due to operation in air bubble mix light-textured soil roadbed on the presence of the structures such as pavement structure, Wu Fajin
Row intensity detection.Therefore need to establish a kind of supersonic detection method of the air bubble mix light-textured soil roadbed in operation, and the detection
Method focus on how do not destroy roadbed or to roadbed damage very little in the case where lay sound detecting pipe.
Summary of the invention
The purpose of the present invention is to provide a kind of sound detecting pipe distribution methods of air bubble mix light-textured soil roadbed, solve existing gas
Steeping mix light-textured soil roadbed, inconvenience detects during operation and detection means damages larger technical problem to roadbed.
To solve the above-mentioned problems, the present invention adopts the following technical scheme that realization:
A kind of vertical distribution method of sound detecting pipe of air bubble mix light-textured soil roadbed, comprising the following steps:
Step 1: sample data is obtained；It is longitudinal for y-axis with roadbed, with roadbed laterally for x-axis, establish two-dimentional rectangular co-ordinate
System, determination is a little denoted as (x on roadbed0, y0), respectively with
Instrument connection sample, l are drilled through for the center of circlegDistance for reinforcing bar away from instrument connection center, wherein Δ s is a fixed range；
If using the coordinate of the i-th row jth column, as the center of circle, the drill bit of drilling machine when drilling through instrument connection is fallen on reinforcing bar, bar diameter
For 6mm~14mm, then distance l of the reinforcing bar away from instrument connection center is calculated by the power increment Δ P of drilling machinegij(i ∈ [0, m], j ∈
[0, n]), the l if not falling on reinforcing bargij=0, lgijFor the distance of the instrument connection centre distance reinforcing bar of the i-th row jth column；
Step 2: search common tangent；Respectively with
For the center of circle, with lgijIt draws and justifies for radius, search is tangential on three or more round common tangents；
Step 3: screening common tangent simultaneously establishes steel mesh coordinate；Screening is mutually perpendicular to and common tangent parallel to each other, rejecting
Remaining common tangent, the common tangent of reservation are in apparent reticular structure, and every common tangent is in the corresponding steel in the corresponding position of roadbed
Muscle infers the distribution coordinate of steel mesh in entire roadbed according to known reinforcement location；
Step 4: ranging is determined；The instrument connection of different spacing is drilled through in roadbed, sound detecting pipe is buried and carries out ultrasound detection, root
Suitable ranging, i.e. the laying spacing l of sound detecting pipe are selected according to ultrasonic testing resultsc；The sound detecting pipe is selected by PVC material system
The flexible sound detecting pipe of work can be such that sounding pipe outer wall fits closely with instrument connection inner wall by filling the water into sound detecting pipe pipe.
Step 5: test point is laid；According to the coordinate of steel mesh in step 3, test point is chosen, centered on test point
4 detection holes are drilled through in " ten " font, two opposite detection pitchs of holes are lc, sound detecting pipe is buried in detection hole.
Further, in step 1, judge that the position of reinforcing bar includes following methods by drilling machine power increment Delta P: working as brill
When machine drill head is fallen on reinforcing bar, as shown in Fig. 7, the contact area of drill bit and reinforcing bar is cl at this timeABAnd clDE, c is and reinforcing bar
The related constant of diameter, lABAnd lDEFor the length of AB, CD.Had according to power definition: power increment Δ P=Δ Fv, wherein for Δ
F frictional force increment, v are drilling machine revolving speed.And had according to frictional force definition: Δ F=k (lAB+lDE), wherein k is and c, reinforcing bar material
Matter, the related constant of drill bit material；
AnddznFor the drill bit internal diameter of drilling machine, dz
To test bore dia, that is, drilling machine outside diameter, lgDistance and l for reinforcing bar away from instrument connection centerg<dz.That is power increment:
Work as lgWhen being zero, the power increment Δ P defined at this time is power increment a reference value Δ P0, it may be assumed that
Distance l for arbitrary reinforcing bar away from instrument connection centerg(lg<dz) have:
Distance l of the reinforcing bar away from instrument connection center is calculated by above formulag。
Further, in step 1, bar diameter is 6mm~14mm.
Further, in step 1, the depth of vertical instrument connection reaches roadbed bottom or not less than 1m.
Further, in step 1, the sample data of instrument connection should be no less than 25.
Further, the slope in step 2, when searching for common tangent, by mathematical software, to the straight line y=kx for crossing origin
K is traversed, and the shortest distance of all circles away from straight line y=kx is calculated separately；Screening is there are 3 or more away from straight line y=kx's
The identical circle of the shortest distance, and then calculate under the slope k, justify tangent a beeline y=kx+b with these, which is required
Common tangent.
Further, in step 4, it is 30cm~150cm that sound detecting pipe, which buries spacing,.
Further, the fixed range Δ s is dz~1.8dz。
Further, the instrument connection and detection bore dia dzFor 30mm~60mm.
A kind of sound detecting pipe transverse direction distribution method of air bubble mix light-textured soil roadbed, comprising the following steps:
Step 1: search steel mesh position；Groove is excavated in roadbed side, makes steel mesh exposure in air, directly sentences
Disconnected steel mesh position；
Step 2: ranging is determined；Instrument connection laterally is drilled through, the instrument connection of different spacing and embedded sounding are drilled through in roadbed
Pipe carries out ultrasound detection, selects suitable ranging, i.e. the laying spacing l of sound detecting pipe according to ultrasonic testing resultsc, instrument connection holding
Certain inclination angle theta；
Step 3: test point is laid；According to the position of steel mesh, test point is chosen, is in " ten " word centered on test point
Shape drills through 4 lateral detection holes, and two opposite detection pitchs of holes are lc, sound detecting pipe is buried in detection hole.
Further, the depth of transverse test hole and detection hole is not less than 1.5m.
Further, the inclination angle theta of the transverse test hole and detection hole is 7.6 °~20 °.
The utility model has the advantages that the present invention can under the premise of not destroying pavement structure in air bubble mix light-textured soil roadbed laying sound
Test tube, for the quality of ultrasound detection roadbed, and execute-in-place is simple and fast, does not influence normally being open to traffic for road surface, moreover it is possible to apply
In the quality testing of the low-intensity roadbed filling of other types.
Detailed description of the invention
Fig. 1 drills through vertical instrument connection for roadbed top surface and determines steel mesh coordinate schematic diagram；
Fig. 2 is that groove search steel mesh position view is excavated in roadbed side；
When Fig. 3 vertically lays sound detecting pipe, detection hole is in " ten " font arrangement schematic diagram；
When Fig. 4 vertically lays sound detecting pipe, detection hole arranges main view in " ten " font；
When Fig. 5 laterally lays sound detecting pipe, detection hole is in " ten " font arrangement schematic diagram；
When Fig. 6 laterally lays sound detecting pipe, detection hole arranges side view in " ten " font；
Schematic diagram when Fig. 7 drill bit of drilling machine is impact steel bar reinforced.
In figure: 1- air bubble mix light-textured soil roadbed, 2- steel mesh, the groove that 3- roadbed side is excavated, the vertical instrument connection of 4-
Or detection hole, 5- transverse test hole or detection hole, 6- test point, 7- horizontal plane, 8- reinforcing bar, 9- drill bit of drilling machine outside, 10- drilling machine
On the inside of drill bit.
Specific embodiment
Technical solution of the present invention is described in further detail below with reference to embodiment:
Certain engineering project builds a highway, in order to avoid causing valve pit subsidence to light rail cushion cap, the work along certain light rail
Foundation soil cannot be handled by the way of rolling operation in journey, therefore using air bubble mix light-textured soil as roadbed, bubble
It is 1.2m that mix light-textured soil, which pours height,.Wherein, cement is using conch board PO42.5 cement, and foaming agent is using Hua Tai
HTW-1 type composite foam agent, design mixture proportion are as follows: the ratio of mud 0.65, cement 365kg/m3, cement slurry mixing water 237kg/m3,
Foaming agent 0.933kg/m3, foaming agent thinned water 46.65kg/m3, the wet density of air bubble mix light-textured soil slurry is 6.5kN/
m3, design strength > 1.0MPa (28d), flow valuve 179mm, foam group's density 50kg/m3。
Embodiment 1:
As shown in Fig. 1~7,1- air bubble mix light-textured soil roadbed, 2- steel mesh, the groove that 3- roadbed side is excavated, 4- is perpendicular
To instrument connection or detection hole, 5- transverse test hole or detection hole, 6- test point, 7- horizontal plane, 8- reinforcing bar, outside 9- drill bit of drilling machine
Side, 10- drill bit of drilling machine inside；
Steel mesh is reticular structure made of being bound as reinforcing bar, and drilling machine can not run through reinforcing bar, but bar spacing is that 10cm is big
In vertically detection bore dia dz=5cm can judge the position of steel mesh by drilling machine power changes delta P, establish two-dimentional right angle and sit
Mark system, calculates the coordinate of steel mesh in entire roadbed.
Since there are two layers of steel meshes in roadbed, the coordinate of first layer steel mesh is first established, resettles second layer steel mesh
Coordinate, steps are as follows:
Step 1: obtain sample data, on roadbed determination be a little denoted as (0,0), respectively with
Instrument connection is drilled through for the center of circle.
If drill through the instrument connection of the i-th row jth column, drill bit of drilling machine is fallen on reinforcing bar, then passes through the power increment meter of drilling machine
Calculate distance l of the reinforcing bar away from instrument connection centergij(i ∈ [1, n+1], j ∈ [1, m+1]), the l if not falling on reinforcing bargij=0.For
It avoids drill bit of drilling machine from falling on second layer steel mesh, interferes the calculating of the coordinate of first layer steel mesh, if test hole depth is greater than
Drill bit of drilling machine is just fallen on reinforcing bar when 0.6m, remembers lgij=0.The position for wherein judging reinforcing bar by drilling machine power increment Delta P includes
Following methods determine power increment a reference value Δ P0, using road-trend as y-axis, using subgrade cross section as x-axis, it is straight to establish two dimension
Angular coordinate system.
When drill bit of drilling machine is fallen on reinforcing bar, power increment:
In formula, Δ P is power increment, and k is constant, and v is drilling machine revolving speed, the drill bit internal diameter d of drilling machinezn=0.048m is surveyed
Prospect hole diameter, that is, drilling machine outside diameter dz=0.05m, lgIt is reinforcing bar away from the distance and l for surveying instrument connection centerg<0.05m。
Work as lgWhen being zero, the power increment Δ P defined at this time is power increment a reference value Δ P0, it may be assumed that
Distance l for arbitrary reinforcing bar away from instrument connection centerg(lg< 0.05m) have:
Distance l of a plurality of reinforcing bar away from instrument connection center is calculated by above formulag。
It is computed, lgijIt is as shown in the table:
Step 2: search common tangent, respectively with
For the center of circle, with lgijDraw and justify for radius, be at least by the search of matlab mathematical software and meanwhile be tangential on three it is round
Common tangent obtains:
Y=0.773x-0.138 and 4 circles for taking (0.3,0), (0.4,0), (0.7,0.3) and (0.8,0.3) as the center of circle
It is tangent；
Y=0.773x-0.012 with (0.1,0), (0.2,0.1), (0.5,0.4), (0.6,0.4) and (0.9,0.7) be
5 circles in the center of circle are tangent；
Y=0.773x+0.114 with (0,0.2), (0.3,0.5) and (0.4,0.5) for the center of circle 3 circles it is tangent；
Y=0.773x+0.240 with (0,0.5), (0.1,0.6) and (0.2,0.6) for the center of circle 3 circles it is tangent；
Y=-1.294x+0.323 and 4 with (0,0.6), (0.3,0.3), (0.4,0.2) and (0.4,0.1) for the center of circle
Circle is tangent；
Y=-1.294x+0.487 with (0.4,0.5), (0.4,0.4), (0.5,0.3), (0.7,0.1) and (0.8,0)
It is tangent for 5 circles in the center of circle；
Y=-1.294x+0.651 with (0.5,0.7), (0.6,0.6), (0.6,0.5), (0.8,0.3), (0.8,0.2)
(0.9,0) tangent for 6 circles in the center of circle.
Step 3: screening common tangent and establish the coordinate of first layer steel mesh, 7 common tangents searched in step 2 are in bright
Aobvious reticular structure infers the distribution of first layer steel mesh in entire roadbed according to known reinforcing bar coordinate position, it may be assumed that y=
0.773+0.114+0.126n, y=-1.294+0.159+0.164m, n and m are integer.
Step 4: determining ranging, vertically drill through the instrument connection that spacing is 0.4m~1.2m and embedded sound detecting pipe in roadbed top surface
Ultrasound detection is carried out, the first layer steel mesh coordinate established when drilling through instrument connection according to step 3 avoids first layer reinforcing bar, instrument connection
Depth is 0.6m, and according to ultrasonic testing results, detection effect is best when ranging is 0.8m, i.e. the laying spacing l of sound detecting pipec=
0.8m；
Step 5: repeating step 1~3, establish the coordinate system of second layer steel mesh；In step 1, to avoid drill bit of drilling machine
It falls on first layer steel mesh, interferes the calculating of the coordinate of second layer steel mesh, if drilling machine bores when test hole depth is less than 0.6m
Head is just fallen on reinforcing bar, remembers lgij=0.
Step: 6: arrangement test point chooses 1 test point every 20m on roadbed, and test point is randomly arranged in away from roadbed
At edge 1.0m and roadbed central location drills through 4 detection holes, root when drilling through detection hole in " ten " font centered on test point
According to the coordinate of the first layer established in above-mentioned steps and second of steel mesh, reinforcement location is avoided.Between two opposite detection holes
Away from for 0.8m, flexibility sound detecting pipe is buried in detection hole.
Embodiment 2:
Step 1: search steel mesh.A groove is excavated in roadbed side, makes steel mesh exposure in air, directly judges steel
Muscle net position, according to excavate groove the case where, steel mesh is located at roadbed height 40cm and 80cm.
Step 2: determining ranging.The instrument connection that spacing is 0.4m~1.2m is drilled through in roadbed side and embedded sound detecting pipe carries out
Ultrasound detection, the aperture in transverse test hole is 5cm, inclination angle theta is 12 °, and according to ultrasonic testing results, ranging is 0.8m testing result
Preferably, i.e. the laying spacing l of sound detecting pipec=0.8m；
Step 3: test point, which is laid, in roadbed side chooses 1 test point every 20m with short transverse along its length, with
Four detection holes are drilled through in " ten " font centered on test point, the inclination angle theta of detection hole is 12 °, opposite two lateral detection holes
Spacing is 0.8m, and flexibility sound detecting pipe is buried in detection hole.
Claims (10)
1. a kind of vertical distribution method of sound detecting pipe of air bubble mix light-textured soil roadbed, which comprises the following steps:
Step 1: sample data is obtained；It is longitudinal for y-axis with roadbed, with roadbed laterally for x-axis, two-dimensional Cartesian coordinate system is established,
Determination is a little denoted as (x on roadbed0, y0), respectively with
Instrument connection sample, l are drilled through for the center of circlegDistance for reinforcing bar away from instrument connection center, wherein Δ s is a fixed range；
If using the coordinate of the i-th row jth column, as the center of circle, the drill bit of drilling machine when drilling through instrument connection is fallen on reinforcing bar, passes through drilling machine
Power increment Δ P calculates distance l of the reinforcing bar away from instrument connection centergij(i ∈ [0, m], j ∈ [0, n]), if not falling on reinforcing bar
lgij=0, lgijFor the distance of the instrument connection centre distance reinforcing bar of the i-th row jth column；
Step 2: search common tangent；Respectively with
For the center of circle, with lgijIt draws and justifies for radius, search is tangential on three or more round common tangents；
Step 3: screening common tangent simultaneously establishes steel mesh coordinate；Screening be mutually perpendicular to common tangent parallel to each other, reject remaining
Common tangent, the common tangent of reservation are in apparent reticular structure, and every common tangent is in the corresponding reinforcing bar in the corresponding position of roadbed, root
The distribution coordinate of steel mesh in entire roadbed is inferred according to known reinforcement location；
Step 4: ranging is determined；According to the coordinate of steel mesh in step 3, the instrument connection of different spacing is drilled through in roadbed, is buried
If sound detecting pipe carries out ultrasound detection, suitable ranging, i.e. the laying spacing l of sound detecting pipe are selected according to ultrasonic testing resultsc；
Step 5: test point is laid；According to the coordinate of steel mesh in step 3, test point is chosen, is in centered on test point
" ten " font drills through 4 vertical detection holes, and two opposite detection pitchs of holes are lc, sound detecting pipe is buried in detection hole.
2. a kind of vertical distribution method of sound detecting pipe of air bubble mix light-textured soil roadbed according to claim 1, feature exist
In judging that the position of reinforcing bar includes following methods by drilling machine power increment Delta P, when drill bit of drilling machine falls in reinforcing bar in step 1
When upper, power increment:
Wherein Δ P is power increment, and k is constant, and v is drilling machine revolving speed, dznFor the drill bit internal diameter of drilling machine, dzIt is for test bore dia
The outside diameter of drilling machine, lgDistance and l for reinforcing bar away from instrument connection centerg<dz；Work as lgWhen being zero, power increment at this time is defined
Δ P is power increment a reference value Δ P0, it may be assumed that
Distance l for arbitrary reinforcing bar away from instrument connection centerg(lg<dz) have:
Distance l of the reinforcing bar away from instrument connection center is calculated by above formulag。
3. a kind of vertical distribution method of sound detecting pipe of air bubble mix light-textured soil roadbed according to claim 1, feature exist
In in step 1, the depth of vertical instrument connection reaches roadbed bottom or not less than 1m.
4. a kind of vertical distribution method of sound detecting pipe of air bubble mix light-textured soil roadbed according to claim 1, feature exist
In in step 1, the sample data of instrument connection should be no less than 25.
5. a kind of vertical distribution method of sound detecting pipe of air bubble mix light-textured soil roadbed according to claim 1, feature exist
In in step 4, it is 30cm~150cm that sound detecting pipe, which buries spacing,.
6. a kind of vertical distribution method of sound detecting pipe of air bubble mix light-textured soil roadbed according to claim 2, feature exist
In the fixed range Δ s is dz~1.8dz。
7. a kind of vertical distribution method of sound detecting pipe of air bubble mix light-textured soil roadbed according to claim 2, feature exist
In the instrument connection or detection bore dia dzFor 30mm~60mm.
8. a kind of sound detecting pipe transverse direction distribution method of air bubble mix light-textured soil roadbed, which comprises the following steps:
Step 1: search steel mesh position；Groove is excavated in roadbed side, makes steel mesh exposure in air, directly judges steel
Muscle net position；
Step 2: ranging is determined；Laterally drill through instrument connection, the instrument connection of different spacing is drilled through in roadbed and embedded sound detecting pipe into
Row ultrasound detection selects suitable ranging, i.e. the laying spacing l of sound detecting pipe according to ultrasonic testing resultsc, instrument connection holding is centainly
Inclination angle theta；
Step 3: test point is laid；According to the position of steel mesh, test point is chosen, is bored centered on test point in " ten " font
4 lateral detection holes are taken, two opposite detection pitchs of holes are lc, sound detecting pipe is buried in detection hole.
9. a kind of sound detecting pipe transverse direction distribution method of air bubble mix light-textured soil roadbed according to claim 8, feature exist
In the depth of transverse test hole and detection hole is not less than 1.5m.
10. a kind of sound detecting pipe transverse direction distribution method of air bubble mix light-textured soil roadbed according to claim 8, feature exist
In the inclination angle theta of the transverse test hole and detection hole is 7.6 °~20 °.
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| CN201811633279.1A CN109487772B (en) | 2018-12-29 | 2018-12-29 | Acoustic pipe laying method for bubble mixed light soil subgrade |
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| CN201811633279.1A CN109487772B (en) | 2018-12-29 | 2018-12-29 | Acoustic pipe laying method for bubble mixed light soil subgrade |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004069367A (en) * | 2002-08-02 | 2004-03-04 | Mitsubishi Heavy Ind Ltd | Reinforcing structure, reinforcing structure evaluation system and reinforcing method |
| KR101432069B1 (en) * | 2014-07-15 | 2014-08-21 | 주식회사 혜안지반 | Apparatus and methode for measuring in-situ stress of rock using overcoring |
| CN107870201A (en) * | 2017-11-10 | 2018-04-03 | 河海大学 | A kind of air bubble mix light-textured soil embankment lossless detection method |
| CN207760837U (en) * | 2017-12-21 | 2018-08-24 | 中铁第四勘察设计院集团有限公司 | A kind of device measuring the sedimentation of highway filled-up ground |
| CN108978740A (en) * | 2018-08-28 | 2018-12-11 | 大连理工大学 | Drilled pile quality determining method based on distributed ultrasound wave sensor |
-
2018
- 2018-12-29 CN CN201811633279.1A patent/CN109487772B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004069367A (en) * | 2002-08-02 | 2004-03-04 | Mitsubishi Heavy Ind Ltd | Reinforcing structure, reinforcing structure evaluation system and reinforcing method |
| KR101432069B1 (en) * | 2014-07-15 | 2014-08-21 | 주식회사 혜안지반 | Apparatus and methode for measuring in-situ stress of rock using overcoring |
| CN107870201A (en) * | 2017-11-10 | 2018-04-03 | 河海大学 | A kind of air bubble mix light-textured soil embankment lossless detection method |
| CN207760837U (en) * | 2017-12-21 | 2018-08-24 | 中铁第四勘察设计院集团有限公司 | A kind of device measuring the sedimentation of highway filled-up ground |
| CN108978740A (en) * | 2018-08-28 | 2018-12-11 | 大连理工大学 | Drilled pile quality determining method based on distributed ultrasound wave sensor |
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