CN112576265A - Sedimentation control method for old villages penetrated by shield - Google Patents
Sedimentation control method for old villages penetrated by shield Download PDFInfo
- Publication number
- CN112576265A CN112576265A CN202011375637.0A CN202011375637A CN112576265A CN 112576265 A CN112576265 A CN 112576265A CN 202011375637 A CN202011375637 A CN 202011375637A CN 112576265 A CN112576265 A CN 112576265A
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- old
- settlement
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- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound 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CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000576 supplementary Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
Abstract
The invention relates to a method for controlling the settlement of an old village under a shield, which is used for carrying out geological survey and investigation on the old village to know the basic form, the structural form and the water well distribution condition of the old village so as to carry out risk assessment and identification on the old village. And determining the serious difficulty and risk points of the shield construction, and taking corresponding reinforcement measures. And designing tunneling parameters of the shield underpass building. Meanwhile, Midas GTS NX is used for simulating the influence of downward penetration of the shield on the old village, and settlement monitoring points are set and monitoring data are read. Finally, performing settlement analysis on the old village which is penetrated by the shield, wherein the simulation data of the settlement analysis is similar to the actual detection value and meets the relevant specifications and standards; the method for controlling the settlement of the old village under the shield can well reduce the uneven settlement and even collapse of the building caused by the old village under the shield.
Description
Technical Field
The invention belongs to the technical field of shield construction, and particularly relates to a method for controlling the settlement of old villages which are penetrated by a shield.
Background
In recent years, along with the continuous development of urban construction in China, the rapid development of rail transit construction in all parts of the country and the construction of a subway tunnel shield method are gradually improved. The shield method is one of the main construction methods for tunnel construction, and has the characteristics of high automation degree, high safety degree, high construction speed, excellent economy, environmental protection and the like. However, influences on the periphery of the tunnel are inevitable, and especially in the area section of the old village, the old village is mostly in a brick-concrete structure, so that uneven settlement and inclination of adjacent buildings are easily caused in the shield tunneling construction process, and great harm is caused. The light person causes house damage, the heavy person threatens life safety, and meanwhile, the severe social influence is caused.
Simultaneously, because old village house construction age is complicated, the foundation form is mostly brick foundation, and building structure is mostly brick structure, cast in situ concrete floor, and the roof is mostly tile or bungalow. When the shield is penetrated downwards, uneven settlement of a foundation, wall cracks and even collapse are easily caused. Meanwhile, in the tunneling range of the shield zone of the old village, dead wells or residual holes may exist, and in the shield construction process, the shield machine is difficult to propel, so that ground collapse and mechanical failure are caused.
In order to reduce the uneven settlement and even collapse of the building caused by the shield under the old village, a settlement control method which is safe in construction and high in economic benefit needs to be provided.
Disclosure of Invention
The invention relates to a method for controlling the settlement of an old village under a shield, which comprises the following steps:
1) carrying out geological survey and investigation on the old village;
2) performing risk assessment and identification on old villages;
3) determining the serious difficulty and risk points of shield construction, and taking reinforcement measures;
4) designing tunneling parameters of a shield underpass building;
5) performing settlement simulation and monitoring of the old village which is penetrated by the shield;
6) and (5) performing settlement analysis of the old village penetrated by the shield.
The method comprises the following steps of 1) carrying out geological survey and investigation on the old village, wherein the geological survey and investigation specifically comprises surveying soil layer distribution of a shield tunnel interval, investigating a building structure and a water well structure of the shield tunnel interval.
And 3) determining the serious difficulty and risk points of shield construction, and taking a reinforcing measure in the reinforcing measures to perform grouting treatment.
And 4) designing the tunneling parameters of the shield underpass building, including shield control pressure, grouting amount and secondary grouting range.
5) in the simulation of subsidence of passing old village under the shield and the monitoring, the simulation of subsidence when passing old village under the shield adopts Midas GTS NX to simulate the influence of passing the shield to old village under the shield, and the steps are as follows in sequence: generating a geometric model, inputting material properties, dividing and expanding grids, extracting structural units, setting boundary loads, defining construction stages, setting analysis working conditions and processing analysis results.
And 5) in the sedimentation simulation and monitoring of the old village which is penetrated under the shield, the monitoring items for carrying out sedimentation monitoring on the old village which is penetrated under the shield comprise farmland and civil house monitoring, earth surface sedimentation observation in a shield interval, underground pipeline monitoring and building sedimentation inclination.
The invention has the beneficial effects that: according to the method for controlling the settlement of the old village under the shield, provided by the invention, the geological survey and investigation are carried out on the old village, so that the basic form, the structural form and the water well distribution condition of the old village are known, and further the risk assessment and identification are carried out on the old village. And then, determining the serious difficulty and the risk point of the shield construction, and taking corresponding reinforcement measures. And then, designing tunneling parameters of the shield underpass building. Meanwhile, Midas GTS NX is used for simulating the influence of downward penetration of the shield on the old village, and settlement monitoring points are set and monitoring data are read. And finally, performing settlement analysis on the old village penetrated by the shield, wherein the simulation data of the settlement analysis is similar to the actual detection value and meets the relevant specifications and standards.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention.
Fig. 2 is a section view of the relationship between residential houses and tunnels.
FIG. 3 is a diagram of a method of monitoring an important underground utility.
Fig. 4 is a schematic diagram of shield tunnel monitoring point arrangement.
FIG. 5 is a schematic view of a building site layout.
Description of the drawings:
1. soil lamination stress measuring points; 2. measuring points of horizontal convergence displacement; 3. vault sinking measuring point; 4. measuring points on the ground; 5. a ground surface; 6. a strip foundation; 7. common settlement monitoring points; 8. a protective cover; 9. important pipeline monitoring points; 10. an important underground pipeline; 11. a midline tunnel; 12. building settlement monitoring points; 13. a wall body; 14. cement mortar; 15. and (6) measuring points for settlement.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "aligned", "overlapping", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example 1
The invention provides a method for controlling the settlement of old villages under a shield, which comprises the following steps:
1) carrying out geological survey and investigation on the old village;
2) performing risk assessment and identification on old villages;
3) determining the serious difficulty and risk points of shield construction, and taking reinforcement measures;
4) designing tunneling parameters of a shield underpass building;
5) performing settlement simulation and monitoring of the old village which is penetrated by the shield;
6) and (5) performing settlement analysis of the old village penetrated by the shield.
The method comprises the following steps that 1) geological survey and investigation are carried out on the old village, wherein the geological survey and investigation specifically comprise the steps of surveying soil layer distribution of a shield tunnel interval, investigating a building structure and a water well structure of the shield tunnel interval; thereby determining the distribution condition of the stratum, the basic form and the distribution condition of the water well. When the basic form is determined, the position relation between the basic form and the interval is noticed, and meanwhile, when the distribution condition of the water well is determined, whether water pumps, steel pipes and other objects are left in the well or not is noticed.
When risk assessment and identification are carried out on the old villages, risk assessment of the old villages along the line and identification of the appearances and structures of the old villages along the line are carried out, and meanwhile risk assessment is carried out on regions with high risks so as to determine the risk level.
And 3) determining the difficulty and risk points of shield construction, taking reinforcement measures in the reinforcement measures according to the preliminary preparation of 1) and 2), determining the difficulty and risk points in the construction, and making corresponding reinforcement measures, so that the construction uniformity and continuity of crossing the old village area are ensured, and the construction is ensured to be carried out smoothly.
And 4) designing the tunneling parameters of the shield underpass building, wherein the parameters comprise shield control pressure, including shield control pressure, grouting amount, secondary grouting range and the like. The reasonable soil bin pressure is one of important measures for ensuring the stability of the tunnel face by adopting a soil pressure balance tunneling mode. Thus, during the driving, a reasonable soil silo pressure is first determined. Wherein, when calculating the shield control pressure P, i.e. P ═ PSoil for soil+PWater (W)In (1)PWater (W)Hydrostatic pressure is used. When the soil pressure balance mode tunneling is carried out, the relationship between the tunneling speed and the soil output needs to be strictly controlled, so that the stability of the tunnel face is ensured. When the shield is driven, the gap position is filled by adopting a double-liquid synchronous grouting mode, so that the gap is timely filled fully, and the settlement of a soil layer on the top of the tunnel is reduced.
5) in the simulation of subsidence of passing old village under the shield and the monitoring, the subsidence simulation when the shield is passed to old village under the shield adopts Midas GTS NX to simulate the influence of the shield to pass under the old village, and the steps of setting up the actual engineering settlement monitoring point and monitoring the actual data are sequentially as follows: generating a geometric model, inputting material properties, dividing and expanding grids, extracting structural units, setting boundary loads, defining construction stages, setting analysis working conditions and processing analysis results.
And 5) in the sedimentation simulation and monitoring of the old village which is penetrated under the shield, the monitoring items for carrying out sedimentation monitoring on the old village which is penetrated under the shield comprise farmland and civil house monitoring, earth surface sedimentation observation in a shield interval, underground pipeline monitoring and building sedimentation inclination.
Example 2
With reference to fig. 1 to 4 and a practical situation of the inventor, in the embodiment of the present invention, the steps of the method for controlling the settlement of the old village under the shield to pass through are described as follows.
(1) Surveying and geological surveying old villages, wherein soil layer distribution of the shield tunnel interval is 29% of pebbles, 34% of medium sand, 35% of silty clay and 2% of round gravels; the foundation form is mostly brick foundation, two-layer brick structure, cast-in-place concrete floor, roof for tile or bungalow; through repeated visiting and checking, the water well adopts the well windlass to take water during the use period, the water well does not adopt the condition of taking water by a steel pipe well wall and a water pump, no water pump, steel pipe and other objects are left in the well, and the underground condition is better.
(2) The old village is subjected to risk assessment and identification, and an example village 1 is selected for description. The resident house generally adopts the bar basis, and the basis buries deeply about 2m, is 1 ~ 3 layers of intensive brick-concrete structure or soil building, and resident house and tunnel section relation are shown as figure 2, probably take place the uneven settlement of basis, wall body crack and even collapse and cause personnel's damage and property loss during the shield is worn down, and the risk level is III level. Dead wells or left holes may exist in a part of tunneling range of the shield region, difficulty in propelling the shield machine may be caused in the shield construction process, ground collapse and mechanical failure are caused, and the risk level is IV level.
(3) And determining the heavy difficulty and the risk points of the shield construction, and taking corresponding reinforcement measures for the heavy difficulty and the risk points of the shield construction according to the early-stage investigation work. The civil building is poor in self condition and not enough to resist differential settlement caused by shield construction, so that the civil building is reinforced. The existing condition of the construction section is combined, self-reinforcing measures of the building are adopted, and grouting treatment is mainly adopted. Meanwhile, in order to ensure the safety of the building, sleeve valve pipes can be pre-embedded in advance, grouting is not performed temporarily, whether grouting is performed or not is determined according to monitoring data, cement slurry is adopted for grouting, and the water cement ratio is 1: 1, adopting cement paste and water glass double-liquid paste if necessary.
(4) And combining the existing situation, geological survey data of the old village, construction difficulty and risk points to further determine initial data and data of the old village under the shield.
(5) And designing the tunneling parameters of the shield underpass building according to the initial data and the data of the shield underpass old village, wherein the parameters comprise shield control pressure, grouting amount, secondary grouting range and the like. Shield control pressure in operationForce P, i.e. P ═ PSoil for soil+PWater (W)In (1) PWater (W)Hydrostatic pressure is used. Meanwhile, the synchronous grouting and the secondary supplementary grouting are strictly controlled, and the grouting amount and the grouting pressure of the synchronous grouting are adjusted at any time according to the ground subsidence monitoring condition, so that the overlarge ground subsidence caused by pressure loss and slurry loss at the cavity position is prevented. In the shield tunneling process, duct piece back grouting is carried out in time, multiple times of grouting can be adopted if necessary, and the grouting filling rate is required to be more than 180%.
(6) The method is used for carrying out the settlement simulation of the old village when the shield is worn downwards, and comprises the following steps in sequence: generating a geometric model, inputting material properties, dividing and expanding grids, extracting structural units, setting boundary loads, defining construction stages, setting analysis working conditions and processing analysis results. When the constitutive model is built, the correlation between the rigidity of the soil body and the stress is considered, and a modified Morel-Coulomb constitutive model is adopted.
(7) The tunnel shield zone is mainly used for monitoring the settlement of the earth surface, the underground pipelines, the building settlement inclination and other monitoring items. In the process of monitoring surface settlement and underground pipeline settlement, a field hardening concrete surface is required to penetrate, then a reinforcing steel bar measuring point with the diameter of 16mm and the length of 80-100 cm is driven according to the thickness of a concrete layer of a pavement, cement mortar is used for backfilling to be compact, and a sleeve is used for isolating when the reinforcing steel bar penetrates through the surface of the concrete pavement, so that the reinforcing steel bar is solidified with a soil body at the lower part and is separated from the upper pavement. The measuring point can be 2-5 mm higher than the ground under the condition of not influencing traffic. The point under the road must be drilled to core through the pavement structure layer and the lower protective sleeve. And marking the periphery of the measuring point by using red paint, and numbering the measuring point by using the red paint. In the important underground pipeline monitoring method, a pilot pit is preferably adopted to expose the pipeline, and then measuring points are arranged on the pipeline, as shown in fig. 3. When the shield is tunneled to about 5m away from the building, the monitoring points are buried, the settlement value of the building is recorded, and the overall settlement of the building and the condition of the ground nearby are observed at any time, which is shown in detail in fig. 4. Monitoring points in a civil house are arranged, a percussion drill is used for drilling holes in the foundation or wall of a building, then semicircular head bent steel bars with the length of 200-300 mm and the diameter of 20-30 mm are placed, and the periphery of the semicircular head bent steel bars is filled with cement mortar, as shown in figure 5.
(8) And finally, comparing the data of the old village subsidence penetrated under the simulated shield with the actual monitoring value, and finding that the value is close to the actual monitoring value and meets the shield tunnel construction and acceptance criteria (GB 50446-2017).
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A method for controlling settlement of old villages under shield tunneling is characterized by comprising the following steps:
1) carrying out geological survey and investigation on the old village;
2) performing risk assessment and identification on old villages;
3) determining the serious difficulty and risk points of shield construction, and taking reinforcement measures;
4) designing tunneling parameters of a shield underpass building;
5) performing settlement simulation and monitoring of the old village which is penetrated by the shield;
6) and (5) performing settlement analysis of the old village penetrated by the shield.
2. The method for controlling the settlement of the old village penetrated by the shield under the shield as claimed in claim 1, wherein: the method comprises the following steps of 1) carrying out geological survey and investigation on the old village, wherein the geological survey and investigation specifically comprises surveying soil layer distribution of a shield tunnel interval, investigating a building structure and a water well structure of the shield tunnel interval.
3. The method for controlling the settlement of the old village penetrated by the shield under the shield as claimed in claim 1, wherein: and 3) determining the serious difficulty and risk points of shield construction, and taking a reinforcing measure in the reinforcing measures to perform grouting treatment.
4. The method for controlling the settlement of the old village penetrated by the shield under the shield as claimed in claim 1, wherein: and 4) designing the tunneling parameters of the shield underpass building, including shield control pressure, grouting amount and secondary grouting range.
5. The method for controlling the settlement of the old village penetrated by the shield under the shield as claimed in claim 1, wherein: 5) in the simulation of subsidence of passing old village under the shield and the monitoring, the simulation of subsidence when passing old village under the shield adopts Midas GTS NX to simulate the influence of passing the shield to old village under the shield, and the steps are as follows in sequence: generating a geometric model, inputting material properties, dividing and expanding grids, extracting structural units, setting boundary loads, defining construction stages, setting analysis working conditions and processing analysis results.
6. The method for controlling the settlement of the old village penetrated by the shield under the shield as claimed in claim 1, wherein: and 5) in the sedimentation simulation and monitoring of the old village which is penetrated under the shield, the monitoring items for carrying out sedimentation monitoring on the old village which is penetrated under the shield comprise farmland and civil house monitoring, earth surface sedimentation observation in a shield interval, underground pipeline monitoring and building sedimentation inclination.
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| CN113775346A (en) * | 2021-11-10 | 2021-12-10 | 北京城建集团有限责任公司 | Soil pressure balance shield construction stratum vertical displacement space-time grading control method |
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