CN102535479A - Design method for controlling deformation of deep foundation pit by using axial force servo system of steel support - Google Patents
Design method for controlling deformation of deep foundation pit by using axial force servo system of steel support Download PDFInfo
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Abstract
The invention discloses a design method for controlling the deformation of a deep foundation pit by using an axial force servo system of a steel support, comprising the following steps of: carrying out continuous medium finite-element analysis according to a deformation control value of a protected facility to obtain a lateral deformation control value of a space enclosing structure and an axial force control threshold value needing to be provided by a steel support; carrying out dynamic monitoring on the actual lateral deformation value of the space enclosing structure and the actual axial force output value of the steel support through detection elements and sending monitored results to an automatic control system; utilizing the automatic control system to carry out comparative analysis on the axial force control threshold value which is preset by advance computational analysis and the monitored results of all the detection elements; and controlling a hydraulic system to adjust support force of the steel support to the space enclosing structure. The design of the axial force of the steel support of the deep foundation pit is changed into an initiative pressurization regulating and controlling design from a passive stressed design so that the deformation of the space enclosing structure of the foundation pit is initiatively regulated and controlled according to control requirements of the deformation of the protected facility which is close to the deep foundation pit; and therefore, the protected facility which is close to the deep foundation pit is effectively protected.
Description
Technical field
The present invention relates to the deep foundation pit construction technical field, relate in particular to a kind of method for designing that adopts steel axial force of the supports servo-drive system control deformation of deep excavation.
Background technology
Along with the fast development that Shanghai Urban is built, the high factor of mistake crowded, the population density of the anxiety of urban centre land resources, traffic has restricted the sustainable development in city.Developing the underground space energetically then is to build the resource-saving city, walks an importance of sustainable development path.When developing urban underground space energetically, run into a large amount of deep-foundation pit engineerings again.These are positioned at the facilities such as all kinds of underground utilities, contiguous all kinds of buildings and subway tunnel that gather around deep foundation ditchs of down town.Because deep big foundation pit construction plant, down town is narrow and small, the construction period is tight, the excavation of foundation pit degree of depth is dark, execution conditions are complicated; The residing stratum of engineering is that saturated aqueous stream is moulded or soft plastic clay layer characteristics such as when compressibilty is big, shear strength is low for hole, sensitivity height basically in addition.Therefore, the distortion of deep foundation ditch will produce bigger variation and the surrounding enviroment facility will be brought influence its displacement field, stress field.
See also Fig. 1, shown in Figure 1 is deformation behaviour sketch map after the excavation of foundation pit unloading.Visible by Fig. 1; The excavation unloading of deep foundation ditch causes the stress field of foundation ditch and surrounding soil, displacement field to change; The result that move on foundation ditch and foundation ditch surrounding soil stratum shows as intuitively: the soil body protuberance b1 in the foundation ditch, the lateral deformation b2 and the ground settlement b3 in hole week of space enclosing structure.
And in the city of soft clay area deep pit excavation, except the intensity and safety and stability that satisfy deep foundation ditch itself, stratum sedimentation outside the hole of main is control distortion that deep pit digging brought and generation is to satisfy the protection requirement of surrounding enviroment.
Foundation ditch not occurrence of large-area percolating water, leak under the situation of mud, quicksand, the major influence factors of the ground settlement in hole week is the lateral displacement of space enclosing structure." the base pit engineering handbook (and Liu Jianhang, Hou Xueyuan, China Construction Industry Press, 1997.4:10-16) and measured data show the fillet foundation ditch hole week ground settlement and the correlation of space enclosing structure lateral deformation stronger.The outer face of land of fillet foundation ditch subsidence range is generally 1.5～2.0 times of cutting depths, and under the non-leakage situation of foundation pit enclosure structure, ground settlement maximum value δ vs is about 0.7 times of the maximum lateral deformation δ of space enclosing structure hs, i.e. δ vs=0.7 δ hs.
At present, in the fillet base pit engineering, the area, Shanghai adopts Φ 609 * 16 steel pipes to support as the main support form usually, and its assembling and disassembling is convenient.The setting of steel supporting base end portion can artificial be added with the flexible joint of a power, thereby can the braced cuts structure can satisfy the requirement of the quick excavation construction of foundation ditch again.But the steel of foundation ditch is supported on to support and can occurs the axle power that stress relaxation to a certain degree brings in the loading process inevitably and lose, and need be added with a power to it.Usually, brace pre axial force be added with the method for a power, be loaded on predetermined shaft power with hydraulic jack, insert then to strike and tightly carve piece locking steel bearing length and remove hydraulic jack again; When needs are added with again, reinstall hydraulic jack and load so circulation.Therefore, the work efficiency that manual work is added with a power is low, and is time-consuming many.For the foundation ditch that has tens steel to support;, construction is difficult to accomplish in time be added with a power when implementing; Therefore, the fillet deep foundation ditch that conventional steel supports is adopted in Shanghai at present, and its space enclosing structure lateral deformation generally all is difficult to satisfy the Deformation control standard of the 0.18H (one-level foundation ditch) of code requirement.Important in protection facility such as operated subway tunnel for the next-door neighbour, the distortion of its deep foundation ditch is difficult to satisfy the Deformation control requirement by the protection facility.
In sum, how the method for designing of the higher employing steel axial force of the supports servo-drive system control deformation of deep excavation of a kind of control efficiency being provided is the technical problem that those skilled in the art need to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of method for designing that adopts steel axial force of the supports servo-drive system control deformation of deep excavation; The axle power design that the deep foundation ditch steel is supported becomes initiatively pressurization regulation and control design by passive pressurized design; Thereby can be protected the Deformation control requirement of facility according to next-door neighbour's deep foundation ditch; Initiatively carry out the distortion regulation and control of foundation pit enclosure structure, thereby effectively protection next-door neighbour deep foundation ditch by the protection facility.
In order to reach above-mentioned purpose, the present invention adopts following technical scheme:
A kind of method for designing that adopts steel axial force of the supports servo-drive system control deformation of deep excavation,
Said steel axial force of the supports servo-drive system comprises automatic control system, hydraulic system and plurality of detection element; Said steel supports the side that is arranged on the space enclosing structure of foundation ditch at interval; Said hydraulic system is through the said space enclosing structure of steel supported; Said hydraulic system is connected with said automatic control system, and said detecting element is connected with said automatic control system respectively, the axle force control valve value that said automatic control system is set computational analysis in advance and compare analysis from the monitoring result of each detecting element; And through the support force of the said hydraulic system adjustment of control steel support to space enclosing structure
The method for designing of said employing steel axial force of the supports servo-drive system control deformation of deep excavation comprises the steps:
(1) according to the Deformation control value of being protected facility; Through the continuous media finite element analysis; Obtain by the relation of protection facility distortion with the space enclosing structure lateral deformation; Obtain the master control index and the grading control index of space enclosing structure lateral deformation, can further obtain the axle power value that steel support needs provide, with the axle force control valve value of this power value as steel axial force of the supports servo-drive system according to space enclosing structure lateral deformation index;
(2) the actual lateral deformation value of space enclosing structure and the actual axle power output valve of steel support are carried out dynamic monitoring and monitoring result is sent to automatic control system;
(3) automatic control system compares the actual lateral deformation value of the lateral deformation controlling value of space enclosing structure and space enclosing structure respectively and analyzes and axle force control valve value that computational analysis is in advance set is carried out analyzing and processing with the actual axle power output valve of steel support, and automatic control system is sent control instruction according to analysis result to hydraulic system;
(4) hydraulic system supports respectively each steel according to control instruction and loads in good time, makes the distortion of space enclosing structure in controlled scope, thereby satisfies by the Deformation control requirement of protection facility.
Beneficial effect of the present invention is following:
The method for designing of employing steel axial force of the supports servo-drive system control deformation of deep excavation provided by the invention; Through the continuous media finite element analysis; Obtain the lateral deformation controlling value of space enclosing structure and the axle power value that the steel support need provide; With the axle force control valve value of this power value as steel axial force of the supports servo-drive system, automatic control system is carried out analyzing and processing according to the actual lateral deformation value of axle force control valve value and space enclosing structure and the actual axle power output valve of steel support, adjusts accordingly automatically.The axle power design that the deep foundation ditch steel is supported becomes initiatively pressurization regulation and control design by passive pressurized design; Thereby can be protected the Deformation control requirement of facility according to next-door neighbour's deep foundation ditch; Initiatively carry out the distortion regulation and control of foundation pit enclosure structure, thereby effectively protection next-door neighbour deep foundation ditch by the protection facility.
Description of drawings
The method for designing of employing steel axial force of the supports servo-drive system control deformation of deep excavation of the present invention is provided by following embodiment and accompanying drawing.
Fig. 1 is the deformation behaviour sketch map after the excavation of foundation pit unloading;
Fig. 2 is the deep big foundation pit engineering general layout plan of the embodiment of the invention;
Fig. 3 is the deep big foundation pit engineering sectional drawing of the embodiment of the invention;
Fig. 4 is the structural representation of the steel axial force of the supports servo-drive system of the embodiment of the invention;
Fig. 5 is the fundamental diagram that the employing steel axial force of the supports servo-drive system of the embodiment of the invention is controlled the method for designing of deformation of deep excavation;
Fig. 6 is subway tunnel actual measurement subsidence curve figure;
Fig. 7 is foundation pit enclosure structure lateral deformation measured value and calculating discreet value comparison diagram.
The specific embodiment
Below will do further to describe in detail to the method for designing of employing steel axial force of the supports servo-drive system control deformation of deep excavation of the present invention.
Below with reference to accompanying drawings the present invention is described in more detail, has wherein represented the preferred embodiments of the present invention, should be appreciated that those skilled in the art can revise the present invention described here and still realize advantageous effects of the present invention.Therefore, following description is appreciated that extensively knowing to those skilled in the art, and not as limitation of the present invention.
For clear, whole characteristics of practical embodiments are not described.In following description, be not described in detail known function and structure, because they can make the present invention because unnecessary details and confusion.Will be understood that in the exploitation of any practical embodiments, must make a large amount of implementation details, for example, change into another embodiment by an embodiment according to relevant system or relevant commercial restriction to realize developer's specific objective.In addition, will be understood that this development possibly be complicated and time-consuming, but only be routine work to those skilled in the art.
For making the object of the invention, characteristic more obviously understandable, be further described below in conjunction with the accompanying drawing specific embodiments of the invention.What need explanation is, accompanying drawing all adopts the form of simplifying very much and all uses non-ratio accurately, only in order to convenient, the purpose of the aid illustration embodiment of the invention lucidly.
See also Fig. 2 and Fig. 3, wherein, shown in Figure 2 is the deep big foundation pit engineering general layout plan of the embodiment of the invention, and shown in Figure 3 is the base pit engineering sectional drawing of the embodiment of the invention.The north side of this foundation ditch is parallel to a subway tunnel, and this subway tunnel comprises subway tunnel uplink 1 and subway tunnel downlink 2.This engineering excavation of foundation pit degree of depth 17.5m～25.4m.
This engineering foundation ditch is surrounded by space enclosing structure 3, and its space enclosing structure 3 is 5.4m with the clear distance of subway tunnel uplink 1.Subway tunnel top buried depth is 8.5m, and this subway tunnel adopts shield method to build, and through seam assembling is adopted in the subway tunnel section of jurisdiction.Seam waterproof between the section of jurisdiction adopts elastic sealing strip.The deflection that opens of circumferential weld, longitudinal joint only allows for 3～5mm; Subway tunnel structure facility absolute settlement amount and horizontal distortion control requirement≤20mm (the final mean annual increment movement amount that comprises various loadings and unloading), 10mm control is pressed in the permission of operation tunnel distortion during the foundation pit construction; Radius of curvature R>=the 15000m of subway tunnel deformation curve; Crooked≤1/2500 relatively of subway tunnel distortion, the horizontal discrepancy in elevation＜4mm of operated subway tunnel two tracks.
Because the excavation of foundation pit depth 17.5m of this engineering Adjacent Metro Tunnels side, cutting depth has surpassed subway tunnel bottom 2.8m, and therefore the distortion stable and that produce of adjacent subway tunnel side deep pit digging threatens to the subway tunnel safety.For guaranteeing the safety of the subway tunnel in the operation, need the Extra-Deep Foundation Pit structure lateral deformation of strict control subway tunnel side, with in allowed limits with the subway tunnel Deformation control.
Please combine referring to Fig. 2 and Fig. 3; High building and podium according to construction project to be built are arranged; In the podium district of adjacent subway side foundation ditch, set up together interim compartment wall, deep big foundation pit is divided into two, be divided into the fillet foundation ditch (being Bei Keng) 5 that faces subway and away from the big foundation ditch (being Nan Keng) 4 of subway; Excavation excavates after big foundation ditch 4 basements are accomplished again and faces the fillet foundation ditch 5 of subway side away from the big foundation ditch 4 of subway earlier.
In the present embodiment,, adopts excavation the method for designing of employing steel axial force of the supports servo-drive system control deformation of deep excavation of the present invention when facing the fillet foundation ditch 5 (being Bei Keng) of subway tunnel side.
See also Fig. 2～Fig. 4, wherein, shown in Figure 4 is the structural representation of the steel axial force of the supports servo-drive system of the embodiment of the invention.Said steel axial force of the supports servo-drive system comprises automatic control system, hydraulic system and plurality of detection element.Said steel supports the side that 8 intervals are arranged on the space enclosing structure 3 of foundation ditch; Said hydraulic system supports 8 through steel and supports said space enclosing structure 3; Said hydraulic system is connected with said automatic control system; Said detecting element is connected with said automatic control system respectively; The axle force control valve value that said automatic control system is set computational analysis in advance and compare analysis from the monitoring result of each detecting element, and adjust the support force that said steel supports 8 pairs of space enclosing structures 3 through controlling said hydraulic system.In the present embodiment; Said hydraulic system comprises hydraulic power unit 11, hydraulic jack 12, ratio decompression pressure valve and proportional amplifier; Said hydraulic power unit 11 is connected with said hydraulic jack 12, proportional pressure-reducing valve and proportional amplifier respectively, and the output of said hydraulic jack 12 and corresponding steel support 8 and be connected.Said automatic control system comprises industrial computer (PC system) 13 and PLC switch board 13, and said industrial computer 11 is connected with said PLC switch board 13, and said PLC switch board 13 is connected with detecting element, proportional pressure-reducing valve and proportional amplifier respectively.
See also Fig. 2～Fig. 5, wherein, shown in Figure 5 is the fundamental diagram of method for designing of the employing steel axial force of the supports servo-drive system control deformation of deep excavation of the embodiment of the invention.The method for designing that this adopts steel axial force of the supports servo-drive system control deformation of deep excavation adopts aforesaid steel axial force of the supports servo-drive system, comprises the steps:
(1) according to the Deformation control value of being protected facility; Through the continuous media finite element analysis; Obtain by the relation of protection facility distortion with the space enclosing structure lateral deformation; Obtain the master control index and the grading control index of space enclosing structure lateral deformation thus, can further obtain the axle power value that steel support needs provide, with the axle force control valve value of this power value as steel axial force of the supports servo-drive system according to space enclosing structure lateral deformation index;
Particularly, in the present embodiment, before fillet foundation ditch 5 excavation constructions, because the excavation of big foundation ditch 4 has produced certain additional deformation influence to subway tunnel 1,2.Therefore, by the protection requirement of subway tunnel 1,2, this engineering fillet foundation ditch 5 excavations must be controlled in the 5mm the additional deformation that subway tunnel 1,2 produces.According to this requirement; Estimate analysis through the two and three dimensions FEM calculation; During fillet foundation ditch 5 excavations; The horizontal movement of fillet foundation ditch 5 adjacent subway gusset protection structures 3 must be controlled in the 13mm, and the Deformation control that could guarantee subway tunnel 1,2 satisfies subway tunnel 1,2 operation security requirements in 5mm.
In the present embodiment, fillet foundation ditch slubbing supports and combines construction bridge to be set to concrete support 7, divides into four road steel and supports 8, confirms that according to aforementioned calculation each road steel supports 8 force control valve values.Second road, the 3rd road steel support 8 and adopt traditional brace pre axial force technology, and axle force control valve value is respectively 1400kN, 1700kN; The 4th road, the 5th road steel support 8 and adopt the steel back shaft to defeat servo-drive system, and axle force control valve value is respectively 2200kN, 2000kN.Under this axial force of the supports, the lateral deformation controlling value of space enclosing structure 3 is that maximum lateral displacement calculated value is 12.2mm.
(2) begin to excavate fillet foundation ditch 5; In fillet foundation ditch 5 digging processs, detecting element carries out dynamic monitoring and monitoring result is sent to automatic control system near the actual axle power output valve that is supported 8 by the actual lateral deformation value of the space enclosing structure of protection facility, steel fillet foundation ditch 5.
In the present embodiment; In fillet foundation ditch 5 work progresss, detecting element to water level, subway outside space enclosing structure 3 lateral deformations of adjacent subway tunnel 1,2 sides, axial force of the supports, subway tunnel distortion (vertical, level to, tunnel vertically reach the horizontal diameter convergence), the hole and the land movement between going along with sb. to guard him carried out monitoring, the monitoring of dynamic overall process.The 5 excavation construction implementation information constructions of fillet foundation ditch; Is foundation with every layer of earthwork and the space enclosing structure of support construction stage 3 with subway tunnel 1,2 Deformation control values; For referencial use with the monitored data in each stage in early stage with the same day, adjustment is formulated this layer and is reached one deck soil excavation and time and the measure of supporting construction down.Guarantee that foundation ditch, subway tunnel and surrounding enviroment deflection are controlled in the scope of estimating.
(3) automatic control system compares the actual lateral deformation value of the lateral deformation controlling value of space enclosing structure and space enclosing structure respectively and analyzes and axle force control valve value that computational analysis is in advance set is carried out analyzing and processing with the actual axle power output valve of steel support, and sends control instruction according to analysis result to hydraulic system.
(4) hydraulic system supports respectively each steel according to control instruction and loads in good time, makes the distortion of space enclosing structure in controlled scope, thereby satisfies by the Deformation control requirement of protection facility.
In the present embodiment, to the 4th, the 5th road totally 54 steel support 8, the work of the computer software control hydraulic system (it comprises 54 hydraulic jack 12 and hydraulic power unit 11) through automatic control system.In the pit earthwork digging process; Automatic control system promptly (compares the axle force control valve value of analysis and the setting of computational analysis in advance and the actual axle power output valve that steel supports to the lateral deformation controlling value of space enclosing structure and the actual lateral deformation value of space enclosing structure) according to design calculated value and monitoring deformation values; Load respectively through the hydraulic jack 12 of automatic control system hydraulic system in good time; Let steel support 8 and keep or adjust its force control valve value, make space enclosing structure 3 keep " zero distortion " state as far as possible.And then guarantee the safety of subway tunnel 1,2.For the cost that reduces steel axial force of the supports servo-drive system be convenient to control, ins conjunction with project situation 54 hydraulic jack are divided into 32 groups, wherein 18 groups is that individual event, 10 groups are that Double Tops, 4 groups are the axle power that steel support 8 is controlled on four tops respectively.
Present embodiment is accomplished from 5 excavation to the base plate constructions of fillet foundation ditch, and the maximum variable quantity of subway tunnel 1,2 horizontal movements is 3.5mm; The maximum variable quantity of subway tunnel 1,2 sedimentations is 1.7mm; The maximum variable quantity of subway tunnel 1,2 convergences is 4.0mm. Adjacent subway tunnel 1,2 gusset protection structures 3 actual measurement lateral deformation maximum values are 13.5mm, and measured data and computational analysis prediction data are identical basically.Please combine to consult Fig. 6 and Fig. 7, wherein, Fig. 6 is subway tunnel actual measurement subsidence curve figure, and Fig. 7 is foundation pit enclosure structure lateral deformation measured value and calculating discreet value comparison diagram.Lateral deformation among Fig. 7 in the dark scope of foundation ditch 11m surpasses calculates discreet value, and reason is that second, third road steel supports 8 and adopted traditional flexible joint technology, and steel supports 8 stress relaxations and causes a power loss bigger, and actual axle power is merely 50% of brace pre axial force.And the axial force of the supports servo-drive system has been adopted in the 4th, the 5th road steel support 8, and axle power is protected in the scope of lower deviation 10% on calculating setting shaft power value all the time.The following space enclosing structure 3 distortion measured values of the dark 11m of foundation ditch are identical basically with the calculating discreet value, thereby successfully controlled the bracing of foundation pit lateral deformation and the subway tunnel distortion of adjacent subway tunnel position.
In sum; The method for designing of employing steel axial force of the supports servo-drive system control deformation of deep excavation of the present invention; Hydraulic system, automatic control system and detecting element through steel axial force of the supports servo-drive system; Can the axle power design that the deep foundation ditch steel supports be become initiatively pressurization regulation and control design by passive pressurized design; Thereby can be protected the Deformation control requirement of facility according to next-door neighbour's deep foundation ditch, initiatively carried out the distortion regulation and control of foundation pit enclosure structure, protected the safety of facility normally to use thereby satisfy next-door neighbour's deep foundation ditch.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (1)
1. a method for designing that adopts steel axial force of the supports servo-drive system control deformation of deep excavation is characterized in that, said steel axial force of the supports servo-drive system comprises automatic control system, hydraulic system and plurality of detection unit
Part; Said steel supports the side that is arranged on the space enclosing structure of foundation ditch at interval, and said hydraulic system is through the said space enclosing structure of steel supported, and said hydraulic system is connected with said automatic control system; Said detecting element is connected with said automatic control system respectively; The axle force control valve value that said automatic control system is set computational analysis in advance and compare analysis from the monitoring result of each detecting element, and support support force to space enclosing structure through the said hydraulic system adjustment of control steel
The method for designing of said employing steel axial force of the supports servo-drive system control deformation of deep excavation comprises the steps:
(1) according to the Deformation control value of being protected facility; Through the continuous media finite element analysis; Obtain by the relation of protection facility distortion with the space enclosing structure lateral deformation; Obtain the master control index and the grading control index of space enclosing structure lateral deformation, further obtain the axle power value that steel support needs provide, with the axle force control valve value of this power value as steel axial force of the supports servo-drive system according to space enclosing structure lateral deformation index;
(2) the actual lateral deformation value of space enclosing structure and the actual axle power output valve of steel support are carried out dynamic monitoring and monitoring result is sent to automatic control system;
(3) automatic control system compares the actual lateral deformation value of the lateral deformation controlling value of space enclosing structure and space enclosing structure respectively and analyzes and axle force control valve value that computational analysis is in advance set is carried out analyzing and processing with the actual axle power output valve of steel support, and automatic control system is sent control instruction according to analysis result to hydraulic system;
(4) hydraulic system supports respectively each steel according to control instruction and loads in good time, makes the distortion of space enclosing structure in controlled scope, thereby satisfies by the Deformation control requirement of protection facility.
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| CN112813988A (en) * | 2020-12-31 | 2021-05-18 | 广西建工集团第五建筑工程有限责任公司 | Concrete foundation pit supporting and monitoring construction technology based on axial force servo system |
| CN113155052A (en) * | 2021-01-05 | 2021-07-23 | 上海建工装备工程有限公司 | Intelligent pre-control and 3D visualization method for foundation pit deformation |
| CN114059550A (en) * | 2021-11-24 | 2022-02-18 | 上海建工集团股份有限公司 | Axial force checking and regulating system and method for foundation pit servo steel support system |
| CN114164835A (en) * | 2021-12-09 | 2022-03-11 | 中铁十五局集团城市轨道交通工程有限公司 | Supporting structure of foundation pit adjacent to existing building and foundation pit construction method |
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| CN114657999A (en) * | 2022-03-07 | 2022-06-24 | 中冶集团武汉勘察研究院有限公司 | Combined pile supporting structure for cylindrical foundation pit and construction method |
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