CN108343097A - A kind of monitoring method of foundation pit rotary churning pile to overhead high-speed rail construction effect - Google Patents

A kind of monitoring method of foundation pit rotary churning pile to overhead high-speed rail construction effect Download PDF

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Publication number
CN108343097A
CN108343097A CN201810077226.XA CN201810077226A CN108343097A CN 108343097 A CN108343097 A CN 108343097A CN 201810077226 A CN201810077226 A CN 201810077226A CN 108343097 A CN108343097 A CN 108343097A
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monitoring
construction
overhead
pressure
pile
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CN201810077226.XA
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CN108343097B (en
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李连祥
刘嘉典
谈从中
盛根来
白璐
陈天宇
成晓阳
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山东大学
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00Testing foundations or foundation structures

Abstract

The invention discloses a kind of monitoring methods of foundation pit jet grouting pile construction effect under overhead high iron wire, it solves the problems, such as monitoring that high-pressure rotary jet grouting pile formation of pile under the prior art influences overhead high-speed rail bridge basis not science, non-system, insufficient, advantageous effect with the trouble free service that can ensure that overhead high-speed rail bridge, scheme are as follows:A kind of foundation pit rotary churning pile includes the following steps the monitoring method of overhead high-speed rail construction effect:1) monitoring scheme of monitoring surrounding soil stress and displacement variation in formation of pile is monitored according to Construction of High Pressure Jet Grouting Pile solution formulation;2) monitoring scheme determined according to step 1) is monitored;3) monitoring data are arranged, grouting pressure is to the displacement field of surrounding soil and affecting laws, that is, Construction of High Pressure Jet Grouting Pile effect of stress field in analysis high-pressure rotary jet grouting pile formation of pile, and determines its influence to overhead high iron base;4) subsequent construction is instructed according to analysis gained Construction of High Pressure Jet Grouting Pile effect.

Description

A kind of monitoring method of foundation pit rotary churning pile to overhead high-speed rail construction effect
Technical field
The present invention relates to supporting fields, more particularly to a kind of foundation pit rotary churning pile to the monitoring side of overhead high-speed rail construction effect Method.
Background technology
High ferro station generally occupy on the outside of city, such as Jinan western station, Nanjing southern station etc..High ferro circuit more have it is overhead, As urban municipal road extends, the urban operating mechanisms such as some turnpike roads and its underground utilities generally require down to wear overhead high ferro, And form foundation pit under overhead high iron wire.Pit retaining monitoring has national standard at present《Building foundation pit supporting Specifications of Monitoring Technology (GB50597)》Lack the specific monitoring and requirement to support construction effect as concrete guide, but in specification.
Town road or the general depth of underground utilities foundation pit are limited under overhead high iron wire, but when level of ground water is shallower, usually It needs that high-pressure rotary-spray pile water stopping curtain is arranged.Huge injection can be generated in high-pressure rotary jet grouting pile formation of pile to surrounding soil to press Power, and foundation pit is often close apart from overhead high iron base under overhead high iron wire, thus high-pressure rotary jet grouting pile pile excessively in native around The change of body stress field will largely influence the stress on original high racks high-speed rail bridge basis thus it is made to be deformed, shadow Ring the safety that is open to traffic of high ferro circuit.Currently, either existing pit retaining monitoring specification or high ferro Line technology specification are for week The construction of the rotation spray stake of overhead high iron base is enclosed all without relevant monitoring flow, is usually used in the monitoring of excavation of foundation pit in construction Means have following defect to the monitoring of jet grouting pile construction effect:1. answering for grouting pressure generation is ignored in the monitoring for being confined to displacement The field of force, which changes, to be influenced 2. to be confined to overhead high iron base to the monitoring of displacement, 3. prison is commonly used in the effect that cannot give full play to monitoring Survey means, which are difficult to be applicable in, causes monitoring to lack systematicness, science.
Therefore, it is necessary to carry out research and design to the monitoring method of overhead high-speed rail construction effect to a kind of foundation pit rotary churning pile.
Invention content
For overcome the deficiencies in the prior art, the present invention provides foundation pit jet grouting pile construction effects under a kind of overhead high iron wire Monitoring method, by Construction of High Pressure Jet Grouting Pile to the deep soil pressure in overhead high ferro biggest impact path, deep soil Position is moved, is monitored with surface subsidence, establishes high-pressure rotary jet grouting pile formation of pile surrounding soil stress field displacement field rule, clear High-pressure rotary jet grouting pile grouting pressure coverage discloses displacement and stressing influence of the grouting pressure to nearest high ferro multi-column pier foundation, really Protect the trouble free service of overhead high-speed rail bridge.
A kind of foundation pit rotary churning pile is as follows to the concrete scheme of the monitoring method of overhead high-speed rail construction effect:
A kind of foundation pit rotary churning pile includes the following steps the monitoring method of overhead high-speed rail construction effect:
1) surrounding soil stress field and displacement in high-pressure rotary jet grouting pile formation of pile are monitored according to jet grouting pile construction solution formulation The monitoring scheme of field variation, including soil mass displacement at the deep layer monitoring point, soil pressure monitoring point, surface subsidence monitoring point for displacement and water The layout scheme of quasi- basic point;
2) layout scheme determined according to step 1) is constructed, and is monitored;
3) monitoring data are arranged, analyzes displacement of the grouting pressure to surrounding soil in high-pressure rotary jet grouting pile formation of pile Affecting laws, that is, Construction of High Pressure Jet Grouting Pile effect of field and stress field, and determine its shadow to overhead high-speed rail bridge basis around It rings;
4) gained Construction of High Pressure Jet Grouting Pile effect is analyzed according to monitoring and subsequent construction is and guided to construction early warning.
Further, the distribution method of monitoring scheme is as follows in step 1):
1-1) determine benchmark layout scheme:Benchmark, which need to be laid in Construction of High Pressure Jet Grouting Pile, to be influenced outside distance, rotation Spray pile driving construction, which influences distance, to be determined by its construction depth, it influences the rotation that maximum distance does not exceed 3 times known to construction experience Spray pile driving construction depth.
1-2) determine that Construction of High Pressure Jet Grouting Pile influences maximum path to overhead high iron base:Construction of High Pressure Jet Grouting Pile is typically Extend along a direction and advance, this direction line is set to the construction line of high-pressure rotary jet grouting pile, it is overhead relative to Construction of High Pressure Jet Grouting Pile line High iron base may be assumed that for outside the construction line a bit, vertical line is most short between point, line, does Construction of High Pressure Jet Grouting Pile line and overhead height The vertical line at iron base center, path where the vertical line is Construction of High Pressure Jet Grouting Pile influences maximum path to overhead high ferro.Therefore, Soil mass displacement at the deep layer monitoring point and surface subsidence monitoring point for displacement should be all arranged on this path.
1-3) determine soil mass displacement at the deep layer monitoring point, soil pressure monitoring point and surface subsidence monitoring point for displacement in construction shadow Ring the layout scheme on maximum path:The used monitoring scheme of the present invention focuses on obtaining Construction of High Pressure Jet Grouting Pile effect in soil Propagation law in body and the influence to overhead high iron base, therefore the cloth of soil mass displacement at the deep layer monitoring point and pressure monitoring point If position wants substantially uniform, i.e., along construction infection maximum path, to be starting point on the outside of high-pressure rotary jet grouting pile every setpoint distance, simultaneously Soil pressure and monitoring point for displacement (including soil mass displacement at the deep layer monitoring point and Ground Subsidence Monitoring point) are laid, in high-pressure rotary jet grouting pile Longitudinal surface where construction influences maximum path to overhead high iron base, lays multiple rows of multiple row earth pressure gauge, and setting multiple row ground is heavy Monitoring point for displacement and multiple row soil mass displacement at the deep layer monitoring point are dropped, Construction of High Pressure Jet Grouting Pile effect is obtained and travels to setpoint distance to this Locate the influence of soil displacement field and stress field.
Wherein, it should not be too large every setpoint distance, otherwise gained construction effects rule is inaccurate, but also can not be too small Cause cost excessively high, while the jet grouting pile construction of piles with different diameter, institute's gauge from answering difference, therefore combine construction experience by institute every Spacing is set as one times of jet grouting pile construction stake diameter.In view of rotary churning pile to overhead high ferro basis distance also not necessarily stake diameter it is whole Multiple, therefore can be adjusted into line space, adjusting range is no more than half times of pilespacing.In addition, laying monitoring instrument at monitoring point needs The construction surface to be set, therefore laying can carry out distance fine regulation between all kinds of monitoring points of same position, general 10~20cm is applied When work conditions permit, Ground Subsidence Monitoring point may extend in foundation platform face.
Further, the step 2) is as follows:
2-1) spirit level is arranged in the benchmark, digging into ground in surface subsidence monitoring point for displacement selection sets The round end reinforcing bar with spirit level cooperation of depth, the sedimentation by observing reinforcing bar round end obtain the surface subsidence of monitoring point, are anti- Overhead high ferro foundation platform sedimentation situation is reflected, which is convenient for cushion cap buried depth, length of the round end reinforcing bar more than earth's surface Spirit level is observed;
The pre-buried inclinometer pipe with inclinometer cooperation, deviational survey length of tube 2-2) are distinguished at the soil mass displacement at the deep layer monitoring point Churning pile length is should be greater than, rotary churning pile entire depth range intrinsic displacement could be monitored, soil thickness is generally no greater than 1m, therefore supervises The certifiable displacement for measuring different depth soil layer of a data is surveyed every 1m along inclinometer pipe using inclinometer when survey, is passed through The setting of multiple row inclinometer pipe forms the soil mass displacement at the deep layer monitoring point of multiple row;
Alternatively, the inclinometer is connect with controller, controller is connect with alarm, and alarm is buzzer or alarm Lamp, controller are PLC controller, and when detecting that displacement is more than sets requirement, controller controls alarm equipment alarm;
2-3) the pre-buried earth pressure gauge at the soil pressure monitoring point:To monitor unified, soil pressure with soil mass displacement at the deep layer Power meter is configured every set depth, one is preferably arranged per 1m depth, step 2-3) in earth pressure gauge be set in supporting rack, Supporting rack includes two angle steel, and multiple rectangular steel plates setting up and down between two angle steel, rectangular steel plates are fixed with earth pressure gauge, prison This support frame structure is embedded in Monitoring on Earth Pressure point together with earth pressure gauge before surveying.
Wherein, above-mentioned earth pressure gauge is connect with controller respectively, and controller is programmable PLC controller, when soil when monitoring When the soil stress at the embedded place of pressure gauge changes, the variation of stress is experienced in earth pressure gauge tablet synchronization, and tablet will produce Change shape, and displacement transfer is transformed into the variation of vibratory string stress to vibratory string, to change the vibration frequency of vibratory string.Earth pressure gauge electromagnetism Coil exciting vibratory string simultaneously measures its vibration frequency, and frequency signal is through cable transmission to reading plotter, you can measures Monitoring on Earth Pressure Put the soil body value of compressive stress of each earth pressure gauge in the vertical direction.
Further, it is as follows in the step 3):
Each Ground Subsidence Monitoring point data 3-1) is compiled, draws surface subsidence-away from high-pressure rotary jet grouting pile distance Curve Figure;
Each soil mass displacement at the deep layer data of monitoring point 3-2) is compiled, draws soil mass displacement at the deep layer-away from high-pressure rotary-spray pilespacing From curve graph;
Each soil pressure data of monitoring point 3-3) is compiled, it is bent away from high-pressure rotary jet grouting pile distance to draw deep soil pressure- Line chart;
3-4) according to step 3-1)-step 3-3) curve graph establish during Construction of High Pressure Jet Grouting Pile along it to overhead height Iron base influences the land movement on maximum path and pressure gauge, specifies the propagation law of Construction of High Pressure Jet Grouting Pile effect, judges Construction of High Pressure Jet Grouting Pile process determines it to overhead high metal bridge the coverage and size of surrounding soil displacement field and stress field The influence on beam basis.
Further, the earth pressure gauge is closed with native face paste is met.
Further, the step 4) is as follows:
4-1) determine construction early warning content:Early warning content includes overhead high ferro foundation settlement, overhead high ferro basis sidesway, height The high iron base institute bearing capacity of frame;
4-2) the influence according to step 3) mesohigh jet grouting pile construction effect to surrounding soil stress field, displacement field determines Whether early warning should be made, while to instruct subsequent construction.
Compared with prior art, the beneficial effects of the invention are as follows:
1) monitoring method provided by the invention, it may be determined that the shadow on overhead high-speed rail bridge basis during jet grouting pile construction It rings, this has most important theories meaning for the construction of rotary churning pile near nearly overhead high ferro, is conducive to the overhead normal operation of high ferro Important Project value is provided, reference is provided for the construction of follow-up correlation engineering, has for the jet grouting pile construction of nearly overhead high iron base There is most important theories meaning.
2) monitoring method of the present invention, application easy to spread can more fully play the effect of monitoring.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.
Fig. 1:Flow chart of the present invention;
Fig. 2:The horizontally disposed figure in monitoring point of the present invention;
Fig. 3:The present invention buries frame-type structure three-dimensional figure used in earth pressure gauge;
Fig. 4:The present invention arranges sectional view along monitoring trace monitor facility.
Wherein:1. overhead high iron base, 2. high-pressure rotary jet grouting piles, 3. benchmarks, 4. soil mass displacement at the deep layer monitoring points, 5. ground Face settlement monitoring point, 6. soil pressure monitoring points, 7. angle steel, 8. rectangular steel plates, 9. round end reinforcing bars, 10. inclinometer pipes, 11. soil pressures Power meter.
Specific implementation mode
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
As background technology is introduced, the deficiencies in the prior art, in order to solve technical problem as above, this Shen It please propose a kind of monitoring method of foundation pit rotary churning pile to overhead high-speed rail construction effect.
In a kind of typical embodiment of the application, as shown in Figure 1, foundation pit jet grouting pile construction under a kind of overhead high iron wire The monitoring method of effect, includes the following steps:
1) surrounding soil stress field and displacement in 1 formation of pile of high-pressure rotary jet grouting pile are monitored according to jet grouting pile construction solution formulation The monitoring scheme of field, including soil pressure monitoring point 6, soil mass displacement at the deep layer monitoring point 4, Ground Subsidence Monitoring point 5 and level base The layout scheme of point 3;
2) layout scheme determined according to step 1) is constructed, and is monitored;
3) monitoring data are arranged, position of the grouting pressure to surrounding soil in analysis 2 formation of pile of high-pressure rotary jet grouting pile Affecting laws, that is, Construction of High Pressure Jet Grouting Pile effect of field and stress field is moved, and determines it to overhead high-speed rail bridge basis 1 around It influences;
4) gained Construction of High Pressure Jet Grouting Pile effect is analyzed according to monitoring and subsequent construction is and guided to construction early warning.
Further, as shown in Fig. 2, the step 1) monitoring scheme specifically to lay formulating method as follows:
1-1) determine 3 layout scheme of benchmark:Benchmark 3, which need to be laid in Construction of High Pressure Jet Grouting Pile, to be influenced outside distance, Jet grouting pile construction, which influences distance L, to be determined by its construction depth H, its influence maximum distance does not exceed 3 times known to construction experience Pile body construction depth H.
1-2) determine that the construction of high-pressure rotary jet grouting pile 2 influences maximum path to overhead high iron base:Jet grouting pile construction is typically edge One direction, which extends, advances, this direction line is set to the construction line of high-pressure rotary jet grouting pile 2, overhead relative to the construction line of high-pressure rotary jet grouting pile 2 High iron base 1 may be assumed that for outside the construction line a bit, vertical line is most short between point, line, do the construction line of high-pressure rotary jet grouting pile 2 with it is high The vertical line at high 1 center of iron base of frame, path where the vertical line is the construction of high-pressure rotary jet grouting pile 2 influences most main road to overhead high ferro Diameter.Therefore, soil pressure monitoring point 6 and soil mass displacement at the deep layer monitoring point 4, Ground Subsidence Monitoring point 5 all should be arranged in this all the way On diameter.
1-3) determine soil pressure monitoring point 6 with soil mass displacement at the deep layer monitoring point 4, Ground Subsidence Monitoring point 5 in construction shadow Ring the layout scheme of maximum path:It constructs propagation law of the effect in the soil body and to overhead height to obtain high-pressure rotary jet grouting pile 2 The influence of iron base 1, soil mass displacement at the deep layer monitoring point 4, Ground Subsidence Monitoring point 5 and deep layer pressure monitoring point 6 installation position It wants substantially uniform, i.e., along construction infection maximum path, to be starting point on the outside of high-pressure rotary jet grouting pile every setpoint distance, while laying soil Body pressure and surface subsidence monitoring point for displacement (including soil mass displacement at the deep layer monitoring point and Ground Subsidence Monitoring point), obtain high pressure rotation The spray construction effect of stake 2 travels to influence of the setpoint distance to soil displacement field at this and stress field.
Wherein, it should not be too large every setpoint distance, otherwise gained construction effects rule is inaccurate, but also can not be too small Cause cost excessively high, while the jet grouting pile construction of piles with different diameter, institute's gauge from answering difference, therefore combine construction experience by institute every Spacing is set as one times of jet grouting pile construction stake diameter d.In view of the distance also not necessarily stake diameter of rotary churning pile 2 to overhead high ferro basis 1 Integral multiple, therefore can be adjusted into line space, adjusting range is no more than 0.5d.In addition, laying monitoring instrument at monitoring point needs The construction surface to be set, therefore laying can carry out distance fine regulation, general 10~20cm between all kinds of monitoring points of same position.
As shown in Figure 3,4, the specific side that step 2) is constructed according to the layout scheme that step 1) determines, and is monitored Method is as follows:
2-1) spirit level is arranged in the benchmark 3, the round end of set depth is dug into the Ground Subsidence Monitoring point 5 Reinforcing bar 9, is observed with spirit level, and the sedimentation by observing reinforcing bar round end 9 obtains the surface subsidence of monitoring point, overhead to reflect 1 cushion cap of high iron base settles situation, which is convenient for level with cushion cap buried depth, length of the round end reinforcing bar 9 more than earth's surface Instrument is observed.High-pressure rotary jet grouting pile 2 measures the initial elevation H of each Ground Subsidence Monitoring point 5 before constructing0, in its work progress The elevation measured is Hc, then the size of height difference, that is, surface subsidence Δ H is Hc-H0
Pre-buried inclinometer pipe 10 2-2) is distinguished at the soil mass displacement at the deep layer monitoring point 4, length should be slightly bigger than high pressure rotation 2 length of stake is sprayed, soil thickness is generally higher than 1m, therefore surveys a data every 1m along inclinometer pipe 10 using inclinometer when monitoring It can guarantee the displacement for measuring different depth soil layer.
It is to utilize gravity pendulum always that wherein inclinometer respectively has a pair of of pulley, upper and lower wheelspan 500mm, operation principle up and down The property for keeping vertical direction, measures the inclination angle between instrument central axes and pendulum vertical line, and the variation at inclination angle can be turned by electric signal It changes and obtains, so as to know by the change in displacement value Δ L of geodesic structure;
Alternatively, the inclinometer is connect with controller, controller is connect with alarm.
Pre-buried earth pressure gauge 11 2-3) is distinguished at the soil pressure monitoring point 6:It unites to be monitored with soil mass displacement at the deep layer One, earth pressure gauge 11 is equally arranged one every 1m depth, therefore earth pressure gauge is set to branch according to the interval earth pressure gauge of 1m In support, supporting rack includes two angle steel, multiple rectangular steel plates 8 setting up and down, rectangular steel plates 8 and soil pressure between two angle steel 7 Power meter 11 is fixed, this support frame structure is embedded in Monitoring on Earth Pressure point together with earth pressure gauge before monitoring, therefore rectangular steel plates 8 Spacing is the distance 1m between set earth pressure gauge 11.
Wherein, above-mentioned earth pressure gauge 11 can be connect with controller respectively, and controller is programmable PLC controller, when monitoring When the soil stress at the embedded place of earth pressure gauge changes, the variation of stress is experienced in earth pressure gauge tablet synchronization, and tablet will Deformation is will produce, displacement transfer is transformed into the variation of vibratory string stress to vibratory string, to change the vibration frequency of vibratory string.Earth pressure gauge Electromagnetic coil exciting vibratory string simultaneously measures its vibration frequency, and frequency signal is through cable transmission to reading plotter, you can measures deep soil The soil body value of compressive stress of each earth pressure gauge 11 in the vertical direction of pressure monitoring point 6, distance high-voltage rotary churning pile 0.1m-1m it Between, last row soil body is arranged between high ferro elevated bridge basis 0.1m-1m in setting first row soil pressure monitoring point Pressure monitoring point, each row are equipped with multiple rows of soil pressure monitoring point.
Further, monitoring data are arranged in the step 3), analyzes slip casting in 2 formation of pile of high-pressure rotary jet grouting pile The displacement field of the pressure against ambient soil body and the construction effect of affecting laws, that is, high-pressure rotary jet grouting pile 2 of stress field, and determine it to surrounding The specific method is as follows for overhead 1 influence of high-speed rail bridge basis:
Each 5 data of Ground Subsidence Monitoring point 3-1) are compiled, draw surface subsidence-away from high-pressure rotary jet grouting pile distance Curve Figure;
Each 6 data of soil mass displacement at the deep layer monitoring point 3-2) are compiled, draw soil mass displacement at the deep layer-away from high-pressure rotary jet grouting pile Distance Curve figure;
Each 4 data of soil pressure monitoring point 3-3) are compiled, draw deep soil pressure-away from high-pressure rotary jet grouting pile distance Curve graph;
3-4) being established in 2 work progress of high-pressure rotary jet grouting pile according to the above curve graph influences most overhead high iron base 1 along it Land movement on big path and pressure gauge specify the propagation law of the construction effect of high-pressure rotary jet grouting pile 2, judge high-pressure rotary jet grouting pile 2 Work progress determines its shadow to overhead high-speed rail bridge basis 1 to the coverage and size of surrounding soil displacement field and stress field It rings.
Construction of High Pressure Jet Grouting Pile influences the land movement on maximum path and pressure gauge along it on overhead high iron base
Further, after step 4) and guides construction early warning according to monitoring analysis gained high-pressure rotary jet grouting pile 2 construction effect The specific method is as follows for continuous construction:
4-1) determine construction early warning content:Early warning includes overhead high ferro foundation settlement, overhead high ferro basis sidesway, overhead height Iron base institute bearing capacity;
Wherein, the surface subsidence extended in land movement table in foundation platform face that is settled into of overhead high iron base 1 is supervised The sidesway of measuring point (away from high-pressure rotary jet grouting pile 5d) institute measured data, overhead high iron base is apart from the overhead high nearest deep soil of iron base Monitoring point for displacement (away from high-pressure rotary jet grouting pile 4d) institute measured data.Overhead high iron base institute bearing capacity is nearest apart from overhead high iron base Soil pressure monitoring point (away from high-pressure rotary jet grouting pile 4d) institute measured data.
4-2) the influence according to step 3) mesohigh jet grouting pile construction effect to surrounding soil stress field, displacement field determines Whether early warning should be made, while to instruct subsequent construction.
According to high ferro circuit design specification, when surveyed overhead high iron base maximum settlement must not exceed 20mm, overhead high ferro The maximal displacement on basis must not exceed(l is overhead high-speed rail bridge span, and unit m) is opened according to the destruction of concrete Split feature, concrete bearing compressive force no more than its reference pressure value 70%.When all kinds of monitoring point institutes measured value is more than with the upper limit Value 70% when, need to unit in charge of construction's early warning, carry out overhead high ferro strengthening of foundation work.
Meanwhile by influencing the land movement on maximum path during Construction of High Pressure Jet Grouting Pile on overhead high iron base along it With pressure gauge, it is known that within the scope of 0~5d the soil body because high-pressure rotary jet grouting pile 2 construction generate displacement field, stress field change, can push away Survey soil displacement field in larger scope, stress field changes, i.e., under the conditions of the engineering soil property, the construction effect of high-pressure rotary jet grouting pile Propagation law, subsequent construction is instructed with this, on high-pressure rotary jet grouting pile subsequent construction influence remaining overhead high iron base size make Go out anticipation, the overhead high iron base for being in relatively hazardous position can be reinforced as early as possible in this way, and can be carried out more to easily there is Dangerous Place For monitoring.
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.

Claims (10)

1. a kind of foundation pit rotary churning pile is to the monitoring method of overhead high-speed rail construction effect, which is characterized in that include the following steps:
1) surrounding soil stress and displacement in high-pressure rotary jet grouting pile formation of pile is monitored according to jet grouting pile construction solution formulation to become The monitoring scheme of change, including soil mass displacement at the deep layer monitoring point, soil pressure monitoring point, surface subsidence monitoring point for displacement and level base The layout scheme of point;
2) monitoring is implemented according to the monitoring scheme that step 1) determines;
3) monitoring data are arranged, analyze in high-pressure rotary jet grouting pile formation of pile grouting pressure to the displacement field of surrounding soil with The affecting laws of stress field, that is, Construction of High Pressure Jet Grouting Pile effect, and determine its influence to overhead high-speed rail bridge basis around;
4) gained Construction of High Pressure Jet Grouting Pile effect is analyzed according to monitoring and subsequent construction is and guided to construction early warning.
2. a kind of foundation pit rotary churning pile according to claim 1 exists to the monitoring method of overhead high-speed rail construction effect, feature In the distribution method of monitoring scheme is as follows in the step 1):
1-1) determine benchmark layout scheme:Benchmark, which need to be laid in Construction of High Pressure Jet Grouting Pile, to be influenced outside distance;
1-2) determine that Construction of High Pressure Jet Grouting Pile influences maximum path to overhead high iron base:Do Construction of High Pressure Jet Grouting Pile line with it is overhead The vertical line of high ferro base center, path where the vertical line is Construction of High Pressure Jet Grouting Pile influences maximum path to overhead high ferro;
1-3) determine soil mass displacement at the deep layer monitoring point, soil pressure monitoring point and surface subsidence monitoring point for displacement construction infection most The layout scheme in big path.
3. a kind of foundation pit rotary churning pile according to claim 2 exists to the monitoring method of overhead high-speed rail construction effect, feature In the step 1-3) in determination soil pressure monitoring point, soil mass displacement at the deep layer monitoring point and surface subsidence monitoring point for displacement It is as follows in the layout scheme of construction infection maximum path:To be starting point on the outside of high-pressure rotary jet grouting pile every setpoint distance, lay simultaneously Soil pressure monitoring point, soil mass displacement at the deep layer monitoring point and surface subsidence monitoring point for displacement, in Construction of High Pressure Jet Grouting Pile to overhead Longitudinal surface where high iron base influences maximum path lays multiple rows of multiple row earth pressure gauge, and multiple row surface subsidence displacement monitoring is arranged Point and multiple row soil mass displacement at the deep layer monitoring point.
4. a kind of foundation pit rotary churning pile according to claim 1 exists to the monitoring method of overhead high-speed rail construction effect, feature In the step 2) is as follows:
2-1) spirit level is arranged in the benchmark, ground set depth is dug into surface subsidence monitoring point for displacement selection With spirit level cooperation round end reinforcing bar;
The pre-buried inclinometer pipe with inclinometer cooperation 2-2) is distinguished at the soil mass displacement at the deep layer monitoring point;
Alternatively, the inclinometer is connect with controller, controller is connect with alarm;
2-3) the pre-buried earth pressure gauge at the soil pressure monitoring point.
5. a kind of foundation pit rotary churning pile according to claim 4 exists to the monitoring method of overhead high-speed rail construction effect, feature In step 2-3) described in earth pressure gauge be set in supporting rack, supporting rack includes two angle steel, setting up and down between two angle steel Multiple rectangular steel plates, rectangular steel plates are fixed with earth pressure gauge.
6. a kind of foundation pit rotary churning pile according to claim 4 exists to the monitoring method of overhead high-speed rail construction effect, feature In the step 2-3) described in earth pressure gauge be configured every set depth.
7. a kind of foundation pit rotary churning pile according to claim 1 exists to the monitoring method of overhead high-speed rail construction effect, feature In in the step 1) between the overhead high iron base 0.1m-1m of distance, the last one soil pressure monitoring point is arranged.
8. a kind of foundation pit rotary churning pile according to claim 1 exists to the monitoring method of overhead high-speed rail construction effect, feature In the step 3) is as follows:
Each Ground Subsidence Monitoring point data 3-1) is compiled, draws surface subsidence-away from high-pressure rotary jet grouting pile distance Curve figure;
Each soil mass displacement at the deep layer data of monitoring point 3-2) is compiled, it is bent away from high-pressure rotary jet grouting pile distance to draw soil mass displacement at the deep layer- Line chart;
Each soil pressure data of monitoring point 3-3) is compiled, draws deep soil pressure-away from high-pressure rotary jet grouting pile distance Curve Figure;
3-4) according to step 3-1)-step 3-3) curve graph establish during Construction of High Pressure Jet Grouting Pile along it to overhead high iron-based Plinth influences the land movement on maximum path and pressure gauge, specifies the propagation law of Construction of High Pressure Jet Grouting Pile effect, judges high pressure Jet grouting pile construction process determines it to overhead high-speed rail bridge base the coverage and size of surrounding soil displacement field and stress field The influence of plinth.
9. a kind of foundation pit rotary churning pile according to claim 4 exists to the monitoring method of overhead high-speed rail construction effect, feature In the earth pressure gauge is closed with native face paste is met.
10. a kind of foundation pit rotary churning pile according to claim 1 exists to the monitoring method of overhead high-speed rail construction effect, feature In the step 4) is as follows:
4-1) determine construction early warning content:Early warning content includes overhead high ferro foundation settlement, overhead high ferro basis sidesway, overhead height Iron base institute bearing capacity;
4-2) the influence according to step 3) mesohigh jet grouting pile construction effect to surrounding soil stress field, displacement field, decides whether Early warning should be made, while to instruct subsequent construction.
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JP2012158953A (en) * 2011-02-02 2012-08-23 Central Japan Railway Co Structure of earthen slope, and method for determining degree of saturation of moisture
CN203008000U (en) * 2012-04-27 2013-06-19 上海隧道工程股份有限公司 Construction monitoring device for high pressure jet grouting pile
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