CN115492178B - Underground structure settlement deformation disease repairing process based on post-expansion bag - Google Patents
Underground structure settlement deformation disease repairing process based on post-expansion bag Download PDFInfo
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- CN115492178B CN115492178B CN202211443599.7A CN202211443599A CN115492178B CN 115492178 B CN115492178 B CN 115492178B CN 202211443599 A CN202211443599 A CN 202211443599A CN 115492178 B CN115492178 B CN 115492178B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/34—Foundations for sinking or earthquake territories
Abstract
The invention discloses an underground structure settlement deformation disease repairing process based on a post-expansion bag, which belongs to the technical field of underground structure disease prevention and control and comprises the following steps: laying a post-expansion bag containing a material A at the position of the disease predicted to be settled and deformed; carrying out construction of the underground structure main body and backfilling of peripheral soil bodies; monitoring the settlement deformation of the disease part with the predicted settlement deformation to obtain a settlement deformation value, comparing the settlement deformation value with a set settlement value, and judging whether to carry out restoration treatment or not; when the repair treatment is needed, the dosage of the filling material B is quantitatively determined; the post-expansion bag is filled with a material B, and the material A and the material B expand after being mixed, so that the main body of the underground structure at the part to be repaired generates jacking displacement upwards, the quantitative repair and the treatment of the settlement deformation diseases of the underground structure are realized, and the problems that the existing treatment mode of the settlement deformation diseases of the underground structure lags behind passively, an effective theoretical basis is lacked, and the scientific prevention, control and treatment of the disease part are difficult are solved.
Description
Technical Field
The invention belongs to the technical field of underground structure disease prevention and control, and particularly relates to an underground structure settlement deformation disease repairing process based on a post-expansion bag.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the increase of population and the gradual congestion of overground space, common underground projects such as subway stations, underground tunnels, underground comprehensive pipe galleries and the like become important directions for urban development at present. Because the underground engineering is buried underground, belongs to semi-concealed engineering, and is easily influenced by stratum conditions, underground water level amplitude change and near excavation disturbance to generate the problems of sedimentation deformation and the like. The reasons and the parts causing the underground structure settlement deformation diseases mainly have the following aspects:
(1) In some long and narrow underground structures, in order to alleviate the problems of structural cracks and settlement damages, deformation joints (which are the general term for expansion joints, settlement joints and quakeproof joints) are generally arranged at regular intervals in the design of the underground structures. Because the deformation joint allows certain settlement displacement, when the settlement deformation of the two sides of the deformation joint exceeds the limit, the problem of water leakage at the deformation joint can be caused, even the structure is cracked, and the safety and stability of the whole structure engineering are influenced;
(2) Because the underground structure is influenced by differential load, the positions such as the change of the self weight of the structure at the position where the section is changed or the change of the upper load are easy to generate differential settlement deformation;
(3) When the underground structure is positioned at a place where the lower lying soil layer is a soft soil layer or a stratum change part, such as a junction of mucky soil and crushed rocks, the settlement amplitude is large on the soft side of the soil layer and is easy to generate settlement deformation under the action of the earthing weight and the structure per se because the bearing capacity conditions of the foundations on the two sides are different;
(4) In some soft soil stratum, can adopt some ground reinforcement's mode to handle, when adopting miniature stake reinforcement ground in the part construction engineering, receive construction quality etc. and influence, appear some piles and do not squeeze into in the bearing layer or appear the stake skew phenomenon, also easily lead to the structure both sides to subside and warp inconsistent.
The above problems of various settlement diseases seriously affect the safe use function and durability of the underground structure, and are one of the important problems which puzzle the health, operation and maintenance of the underground structure. At present, the mode of treating the settlement deformation of the underground structure is not mature, effective means are few, and the underground structure is treated by jacking by grouting the stratum. The means are more effective reinforcement modes after settlement diseases occur, and because the underground structure is buried underground, drilling grouting can be performed to the bottom of the structure along the ground surface on one hand, and grouting can be performed to surrounding strata through the main body in the structure on the other hand.
The inventor finds that the following problems still exist in the conventional underground structure settlement deformation disease repair process, such as a grouting jacking mode, and need to be solved:
(1) The conventional means for treating the settlement deformation of the underground structure are all treatment after the settlement diseases are generated, certain hysteresis exists, and effective pretreatment measures are not available at present;
(2) When the settlement and deformation problems of the underground structure are treated by a traditional mode (such as grouting reinforcement), the design is usually carried out based on experience, and the repair treatment process lacks theoretical design basis;
(3) When the traditional grouting mode is adopted for treatment, the grouting is greatly influenced by stratum differences, and in some denser stratums, the grout is difficult to diffuse to all effective areas, so that the underground structure of a diseased part is difficult to effectively treat; on some loose strata, grouting slurry can be effectively diffused, but an effective grouting area for jacking treatment of an underground structure is difficult to accurately control; under the influence of stratum condition difference, how to determine reasonable grouting pressure becomes one of the difficulties in treatment;
(4) When the conventional mode carries out the slip casting to the stratum soil body on every side from underground structure is inside, need follow underground structure main part and execute and beat the slip casting hole, this can harm main structure and outside waterproof layer, easily produces the percolating water problem, influences holistic safety and stability and service function, and this technology is more difficult and waste time and energy.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a post-expansion bag-based underground structure settlement deformation disease restoration process, which effectively solves the problem of underground structure settlement disease treatment by a pretreatment mode, realizes quantitative control of underground structure settlement deformation displacement and guides scientific restoration treatment of the underground structure settlement disease according to a quantitative analysis method for the volume of an expandable material under a specific pressure state, and is different from the prior art that the treatment is carried out after the underground structure is settled.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention provides a post-expansion bag-based underground structure settlement deformation disease repair process, which comprises the following steps of:
after the excavation of the underground structure foundation pit is finished, laying a post-expansion bag containing a material A at the bottom of the foundation pit at the position of the predicted settlement deformation disease, and laying a filling pipeline to be communicated with the post-expansion bag;
constructing an underground structure main body and backfilling a peripheral soil body above the rear expansion bag;
after the soil body backfilling is finished, carrying out settlement deformation monitoring on the predicted settlement deformation disease part to obtain a settlement deformation value, comparing the settlement deformation value with a set settlement value, and judging whether restoration treatment is needed or not;
when the repair treatment is needed, the dosage of the filling material B is quantitatively determined;
the filling pipeline is used for quantitatively filling the material B into the post-expansion bag, and the material A and the material B expand after being mixed in the filling process, so that the underground structure main body of the part to be repaired is lifted upwards to generate displacement, and the quantitative repair and treatment of the settlement deformation disease of the underground structure are realized.
As a further technical scheme, the post-expansion bag has water-resisting property so as to prevent the material A in the post-expansion bag from generating contact reaction with the surrounding underground water.
As a further technical solution, the method for determining the amount of filling material B is: according to the settlement deformation value generated by the underground structure, the self weight of the underground structure and the burial depth of the underground structure, the filling amount function expression of the material B filled after the post-expansion capsular bag is quantitatively determined by an indoor loading test, and then the actual filling amount of the material B is determined.
As a further technical solution, the determination method of the filling dosage function expression of the filling material B is as follows:
placing a post-expansion bag containing a material A in an indoor pressure tester, and loading the post-expansion bag from the top under the condition of displacement constraint at the periphery;
at a certain corresponding loading pressure P i Keeping constant, expanding the bag backward to fill with material B, and monitoring and loading pressure P i Material B filling amount W j Corresponding jacking displacement U of post-expansion bag j I and j are continuous positive integers with the starting value of 1; obtaining the filling dosage W of the material B corresponding to a certain loading pressure state j And the jacking displacement U j Between fitting function expressions and corresponding function change rate k Pi ：
；
According to the function change rate values corresponding to a plurality of loading pressure states, the loading pressure P is obtained by utilizing mathematical function fitting i And the rate of change of function k Pi Fitting functional expression between:
；
the quantity W of filling material B required to establish a certain loading pressure state j The function expression:
。
as a further technical scheme, the total pressure of the upper part of the post-expansion bag is determined according to the buried depth, the dead weight and the weight of the overlying soil layer of the underground structure of the part to be repaired and treated
And combining the settlement deformation value of the part to be repaired
The actual filling amount of the required material B can be determined by calculating the formula of the filling material B amount function
Comprises the following steps:
。
as a further technical scheme, during loading, a series of loading pressures P are set i And ensure that the material B is quantitatively filled in the bag after the bag is expanded backwards under the constant loading pressure state; in the filling process, the jacking displacement change of the post-expansion bag is monitored, and after the displacement is stable, the pressure P is recorded and loaded i Material B filling amount W j Corresponding jacking displacement U j 。
As a further technical scheme, the material B is filled with the dosage W j And jacking displacement U j The process of obtaining the fitting function expression is as follows: drawing to obtain different loading pressures P i Filling amount W of material B in state j And the jacking displacement U j The data scatter plot of (a); according to the principle of a least square method, fitting a data scatter diagram by using a linear function to obtain the filling amount W of the material B corresponding to a certain loading pressure state j And jacking displacement U j Between fitting function expression and corresponding function change rate k Pi ：
。
The beneficial effects of the invention are as follows:
the underground structure settlement deformation disease repairing process provided by the invention has the advantages that the bag is expanded after the settlement position of the hidden danger of the underground structure is arranged in the construction stage (before the settlement deformation disease is generated), and meanwhile, the scientific judgment is carried out by combining the later monitoring data, so that the process belongs to the prevention and control measures of active pretreatment in advance. Compared with the conventional passive treatment mode after the settlement deformation disease is generated, the process can perform early warning and repair on the settlement deformation disease in time at the beginning of the generation of the settlement deformation disease, eliminate the adverse effect in advance and effectively realize scientific prevention and control of the whole life cycle of the operation and maintenance of the underground structure.
According to the process for repairing the settlement deformation disease of the underground structure, the influence of factors such as the dead weight and the burial depth of the underground structure is considered, a theoretical calculation formula and a design basis of the jacking displacement of the post-expansion bag and the usage of post-filling materials are given, a quantitative design method of the usage of the post-filling materials corresponding to the degree of the settlement deformation disease is formed, and the quantitative repair and treatment of the settlement deformation disease of the underground structure are realized.
The invention provides a treatment process for presetting repair of underground structure settlement deformation diseases by utilizing an expansion bag after pre-embedding in advance and a matched filling method, the process can effectively realize jacking repair treatment under the condition of not influencing the safety of the whole structure, can make up the defects of grouting parameter empirical design, slurry diffusion randomness, difficult guarantee of grouting pressure and the like in the traditional grouting reinforcement process, and provides theoretical and technical support for realizing the treatment of the underground structure settlement diseases.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of the process for repairing settlement deformation diseases of an underground structure according to the present invention;
FIG. 2 is a schematic view of the arrangement section of the expanding bladder after excavation of the foundation pit according to the present invention;
FIG. 3 is a schematic diagram of the completed construction of the underground structural body of the present invention;
FIG. 4 is a schematic diagram of the underground structure after backfilling of soil around the main body;
FIG. 5 is a schematic diagram of the underground structure of the present invention after settlement deformation damage has occurred;
FIG. 6 is a schematic diagram of the invention after the disease treatment of settlement deformation of the underground structure;
FIG. 7 is a plan view of the placement of post-dilation bladder at the bottom of the subterranean structure of the present invention;
FIG. 8 is a schematic illustration of an indoor loading test of the post-dilation balloon of the present invention;
FIG. 9 is a schematic diagram of a fit function between post-dilation bladder jacking displacement and fill volume of the present invention;
FIG. 10 is a graphical illustration of a fit function between the rate of change of the function and the loading pressure of FIG. 9.
In the figure: the space or size between each other is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein: 1-post expansion of the capsular bag; 2-a supporting structure; 3-a filling line; 4-underground structure; 5-backfilling; 6-deformation joint; 7-a pressure tester; 8-filling port; 9-material A; 10-a loading plate; 11-a constraint structure.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In a typical embodiment of the present invention, as shown in fig. 1, a process for repairing a settlement deformation disease of an underground structure based on a post-expansion capsular bag is provided, which comprises the following steps:
step 1: after excavation of the underground structure foundation pit is finished, laying a strip-shaped post-expansion bag 1 containing a material A9 inside at the bottom of the foundation pit at the position predicted to be settled and deformed, paying attention to the fact that the post-expansion bag 1 has water-resisting property and waterproof function so as to prevent the material A9 from reacting with underground water, and well laying a filling pipeline 3 related to the post-expansion bag 1, as shown in figures 2 and 7;
and 2, step: finishing the main body construction (shown in figure 3) of the underground structure 4 and the backfilling work (shown in figure 4) of the peripheral soil body above the post-expansion bag 1 according to the design requirements, wherein the post-expansion bag 1 is prevented from being damaged in the construction process in the step;
and 3, step 3: after the soil body backfilling is finished, carrying out settlement deformation monitoring on the predicted settlement deformation disease part to obtain a settlement deformation value, comparing the settlement deformation value with a set settlement value, and judging whether restoration treatment is needed or not;
and 4, step 4: when the settlement deformation value of the predicted settlement deformation disease part exceeds the set settlement value, namely, when restoration and treatment are needed, the actual filling amount of the material B to be filled is quantitatively determined by combining parameters such as the buried depth, the dead weight and the weight of the overlying soil layer of the underground structure 4 of the part to be restored and treated;
and 5: on the basis of the step 4, the material B is quantitatively filled into the post-expansion bag 1 by using the filling pipeline 3 laid in the step 1 at the position of the filling opening 8, the material A9 and the material B expand after being mixed in the filling process, so that the main body of the underground structure 4 at the part to be repaired is promoted to lift upwards to generate jacking displacement, and further the quantitative repair and treatment of the settlement and deformation diseases of the underground structure 4 at the part to be repaired and treated are realized, as shown in fig. 6.
Wherein, predicting the settlement deformation disease part comprises the following steps: the position of the underground structure 4 such as the position where the section size changes, the upper load changes, the position where the conditions of the underground layer change, the position disturbed by the adjacent construction, or the joint position of the underground structure 4 such as a deformation joint 6 and a construction joint. In the present embodiment, the deformation joint 6 of the underground structure 4 will be described as an example.
In this embodiment, in step 1, three strip-shaped post-expansion pockets 1 containing a material A9 therein are laid on both sides of a deformation joint 6 of an underground structure 4. And 3, monitoring the settlement deformation of the position of the deformation joint 6.
In the embodiment, in step 1, after excavation of the underground structure foundation pit is completed, the supporting structure 2 is arranged on the inner side wall of the foundation pit, the supporting structure 2 is vertically arranged, and the post-expansion bag 1 is laid at the bottom of the pit between the supporting structures 2 on the two side walls of the foundation pit.
The post-expansion bag 1 is communicated with the filling pipeline 3, and a filling port 8 of the filling pipeline 3 extends and is distributed to the ground surface.
In the step 2, the underground structure 4 is constructed on the top of the post-expansion bag 1, after the underground structure 4 is constructed, soil mass constructed on the top of the underground structure 4 is backfilled to be level with the ground surface, and backfilling soil 5 is formed on the top of the underground structure 4.
In the step 3, whether the repair and the treatment are needed or not can be determined by comparing the settlement deformation value of the predicted settlement deformation disease part with the set settlement value, and meanwhile, the part needing repair and the treatment can also be determined. In this embodiment, when the settlement deformation displacement occurs on both sides of the deformation joint 6 and needs to be repaired and treated (see fig. 5), the repair and treatment need to be performed on the deformation joint.
In step 4, the filling dosage function expression of the material B is determined quantitatively by an indoor loading test, and then the actual filling dosage of the material B is determined.
In this embodiment, the material A9 in the post-expanding pouch 1 may be expansive soil, polyurethane, or the like, and the material B may be water or other materials that can expand in volume after being mixed with the material A9. Of course, the materials A9 and B may be other materials that expand in volume after being mixed, and are not limited herein.
Assuming that a material A9 in a post-expansion bag 1 embedded at the bottom of an underground structure 4 is expansive soil and a material B is water, wherein the dosage of the expansive soil is determined as a certain value, and a charging dosage function expression of the water is determined by a pressure tester 7, and the specific method is as follows:
step A: placing a post-expansion bag 1 containing a material A9 in an indoor pressure tester 7, wherein a loading plate 10 is arranged above the post-expansion bag 1, and a constraint structure 11 is arranged on the periphery of the post-expansion bag 1, so that the post-expansion bag 1 is loaded from the top under the condition of displacement constraint on the periphery, and the pressure tester 7 is used for loading the loading plate 10 by applying pressure to simulate the actual state of the post-expansion bag 1 at the bottom of an underground structure 4 on site, as shown in FIG. 8;
and B: by setting a series of loading pressures P i (i =1,2,3 \8230; 5), in which a loading pressure range is set to 100-500 kPa, and it is ensured that water is filled in a fixed amount into the backward expanding pouch 1 from the filling port 8 of the filling line 3 under a constant loading pressure;
and C: in the filling process, the jacking displacement change of the post-expansion bag 1 is monitored, and after the displacement is stable, the pressure P is recorded and loaded i Water filling amount W j (j =1,2,3 \8230; 10) corresponds to the lift-up displacement U j (j =1,2,3 \8230; 10), in the step, the water filling amount is set to be 1-10L, each 2L of water filling is carried out, and after the displacement is stabilized, the current jacking displacement value is recorded, and the specific data are shown in table 1;
TABLE 1 jacking Displacement Change of Material A under different pressures
Step D: according to the experimental monitoring data of the filling process, different loading pressures P are obtained by drawing i Water filling amount W in state j And the jacking displacement U j Fitting the data scatter plot with a linear function according to the principle of least squares, as shown in fig. 9; the jacking displacement values of different filling amounts under 100-500 kPa are given in FIG. 9, and the water filling amount W corresponding to a certain loading pressure state is obtained j And the jacking displacement U j Between fitting function expressions and corresponding function change rate k Pi Specifically, it can be represented as:
and E, step E: according to the multiple loading pressures in the step D and the corresponding function change rates thereof, obtaining the loading pressure P by mathematical function fitting i And rate of change of function k Pi Fitting functional expression therebetween
The function graph is shown in fig. 10; FIG. 10 shows k at 100-500 kPa Pi The value varies, k being greater with pressure Pi The slower the decline trend, the specific expression is as follows:
step F: according to the steps D and E, the filling amount W of water required for establishing a certain loading pressure state j Function expression
The method specifically comprises the following steps:
step G: repairing the underground structure 4 of the treatment part according to the needs, the burial depth, the self weight andthe weight of the overburden layer and other parameters are determined, and the total upper repeat pressure of the post-expansion bag 1 on site is determined
(ii) a And combining the settlement deformation value of the part to be repaired
(ii) a Substituting the water quantity into the functional expression of the water filling quantity in the step F, and calculating to determine the actual filling quantity of the required water
Is composed of
The method specifically comprises the following steps:
wherein, P 0 Is the sum of the dead weight of the main body of the structure, the dead weight of the overlying soil body and the surface pressure. The parameters of the underground structure 4, such as the buried depth, the self weight, the weight of the overburden, etc., can be determined according to on-site surveys of the underground structure 4, etc.
A-G steps give out a theoretical calculation formula and a design basis of the jacking displacement of the post-expansion bag 1, when the parameters of the underground structure 4 such as the burial depth, the dead weight, the weight of the overlying soil layer, the settlement displacement and the like are known, the filling amount of the material B can be obtained according to the formula, the quantitative application of the jacking treatment process of the underground structure 4 is realized, and a theoretical technical support is provided for the settlement deformation disease treatment of the underground structure.
The jacking treatment process for settlement deformation diseases of the deformation joint of the underground structure, which is provided by the embodiment, quantitatively describes the repair treatment, is a preset method for treating the settlement displacement of the underground structure, can effectively make up for the defects in the prior art, and provides a complete set of theoretical and technical support for the healthy operation and maintenance of the underground structure. The process adopts the filling material to controllably treat the settlement of the underground structure, realizes the effective prevention and control of the whole period of the underground structure, realizes the quantitative design and implementation of settlement repairing treatment parameters, and provides a theoretical and technical reference for the settlement diseases of the underground structure.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A process for repairing settlement deformation diseases of underground structures based on post-expansion sacks is characterized by comprising the following steps:
after the excavation of the underground structure foundation pit is finished, laying a post-expansion bag containing a material A at the bottom of the foundation pit at the position of the predicted settlement deformation disease, and laying a filling pipeline to be communicated with the post-expansion bag;
constructing an underground structure main body and backfilling a peripheral soil body above the rear expansion bag;
after the soil body backfilling is finished, carrying out settlement deformation monitoring on the predicted settlement deformation disease part to obtain a settlement deformation value, comparing the settlement deformation value with a set settlement value, and judging whether restoration treatment is needed or not;
when the repair treatment is needed, the dosage of the material B to be filled is quantitatively determined;
the method for determining the amount of the filling material B comprises the following steps: quantitatively determining a filling dosage function expression of the filling material B after expanding the capsular bag by an indoor loading test according to a settlement deformation value generated by the underground structure, the self weight of the underground structure and the burial depth of the underground structure, and then determining the actual filling dosage of the material B;
in an indoor loading test, a post-expansion bag containing a material A is placed in an indoor pressure tester, so that the post-expansion bag is loaded from the top under the condition of displacement constraint at the periphery; during loading, at a certain loading pressure P i Keeping constant, expanding the bag backward to fill the bag with a fixed amount of material B, and monitoring and loading the pressure P i Material B filling amount W j Corresponding post-expansion bladder jackingDisplacement U j I and j are continuous positive integers with the starting value of 1; obtaining the filling amount W of the material B corresponding to a certain loading pressure state j And jacking displacement U j Between fitting function expressions and corresponding function change rate k Pi ：
(ii) a According to the function change rate values corresponding to a plurality of loading pressure states, the loading pressure P is obtained by utilizing mathematical function fitting i And the rate of change of function k Pi Fitting functional expression between:
(ii) a The quantity W of filling material B required to establish a certain loading pressure state j The function expression:
；
and the material B is quantitatively filled in the post-expansion bag by using a filling pipeline, and the material A and the material B expand after being mixed in the filling process, so that the underground structure main body of the part to be repaired and treated is lifted upwards to generate displacement, and the quantitative repair and treatment of the settlement deformation disease of the underground structure are realized.
2. The process for remedying a settling deformation disease of an underground structure based on a post-expansion sac according to claim 1, wherein the post-expansion sac has a water barrier property so as to prevent the material A in the post-expansion sac from contacting and reacting with the surrounding underground water.
3. The post-dilation balloon-based subterranean structure settlement deformation disease remediation process of claim 1 wherein upon loading, by setting a series of loading pressures P i And ensuring that the bag is expanded backwards to be filled with the material B quantitatively under the constant loading pressure state; in the filling process, the jacking displacement change of the post-expansion bag is monitored, and after the displacement is stable, the pressure P is recorded and loaded i Material B filling amount W j Correspond to each otherJacking displacement U j 。
4. The process for repairing settlement deformation disease of underground structure based on post-expansion capsular bag as claimed in claim 1, wherein the filling amount W of material B j And jacking displacement U j The process of obtaining the fitting function expression is as follows: drawing to obtain different loading pressures P i Filling amount W of material B in state j And jacking displacement U j The data scatter plot of (a); according to the principle of a least square method, fitting a data scatter diagram by using a linear function to obtain the filling amount W of the material B corresponding to a certain loading pressure state j And the jacking displacement U j Between fitting function expression and corresponding function change rate k Pi ：
。
5. The post-expansion capsular bag based underground structure settlement deformation disease repair process as claimed in claim 1, wherein the total upper-portion repeat pressure of the post-expansion capsular bag is determined according to the buried depth, the self-weight and the weight of the overburden layer of the underground structure at the part to be repaired
And combining the settlement deformation value of the part to be repaired
Substituting the calculated value into the function expression of the filling material B amount to calculate and determine the actual filling amount of the required material B
Comprises the following steps:
。
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| CN112323853A (en) * | 2019-08-05 | 2021-02-05 | 张继红 | Self-adaptive linear underground engineering structure and transverse deformation control method thereof |
| CN113737624A (en) * | 2021-09-13 | 2021-12-03 | 天津大学 | Bridge head bump bag type grouting repair construction method |
| CN114293993A (en) * | 2021-12-09 | 2022-04-08 | 中国建筑第五工程局有限公司 | Vertical deformation repairing structure for construction of up-down overlapped tunnel and construction method |
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