CN116988801A - Method for treating sudden boulder group in soft soil cutterhead slurry shield tunneling process - Google Patents
Method for treating sudden boulder group in soft soil cutterhead slurry shield tunneling process Download PDFInfo
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- CN116988801A CN116988801A CN202310932964.9A CN202310932964A CN116988801A CN 116988801 A CN116988801 A CN 116988801A CN 202310932964 A CN202310932964 A CN 202310932964A CN 116988801 A CN116988801 A CN 116988801A
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000002002 slurry Substances 0.000 title claims abstract description 44
- 230000005641 tunneling Effects 0.000 title claims abstract description 34
- 239000002689 soil Substances 0.000 title claims abstract description 23
- 239000004575 stone Substances 0.000 claims abstract description 32
- 238000010276 construction Methods 0.000 claims abstract description 18
- 238000009412 basement excavation Methods 0.000 claims abstract description 9
- 238000003672 processing method Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 238000005553 drilling Methods 0.000 claims description 14
- 239000000440 bentonite Substances 0.000 claims description 9
- 229910000278 bentonite Inorganic materials 0.000 claims description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 9
- 239000004570 mortar (masonry) Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 230000036346 tooth eruption Effects 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012790 confirmation Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a processing method of sudden boulders in the soft soil cutterhead slurry shield tunneling process, which adopts a geological survey confirmation range, digs holes in a rotary way to take out boulders, and the shield pushes the boulders clung to the cutterhead into a super-digging groove, so that the encountered boulders are thoroughly processed, the construction efficiency is high, the effect is good, and no omission exists; simultaneously, the structure and the function characteristics of the slurry shield are fully utilized, dense slurry is adopted to protect the wall to carry out rotary excavation treatment on the isolated stones close to the cutterhead, the first hole depth is overdrawn, the isolated stones close to the cutterhead are pushed into the overdrawn groove through shield micro-motion propulsion, and the problem that the isolated stones close to the cutterhead cannot be treated is solved.
Description
Technical Field
The invention relates to the field of shield tunnel engineering, in particular to a method for treating sudden boulders in the slurry shield tunneling process of a soft soil cutterhead.
Background
The existence of boulders in shield tunneling greatly affects the shield tunneling, and is a major technology facing the shield tunneling
The technical problem is that in the actual construction process, if ultra-large diameter boulders and large-scale boulders are encountered, the hard rock strength is extremely high, so that the construction difficulty is high, when a shield is driven in the boulders, the boulders roll randomly in the stratum, the cutter head is extremely easy to cause unbalanced load, the shield posture is difficult to control, under the condition, the driving is carried out, the cutter head penetration is extremely low, the peripheral soil body is greatly disturbed in the driving process, the bottom layer settlement exceeds the standard easily, the safety of peripheral construction (construction) is even endangered, and meanwhile, the phenomena of tipping, broken shafts, easy loosening of bolts and the like are easy to occur to cutters in the driving process, so that the influence on the shield driving construction is extremely large.
The boulder is a product of differential weathering of a rock mass under the action of long geology, is influenced by regional geological structures, is mostly remained in a strong weathering rock layer or a residual layer, has the characteristics of high strength and strong concealment, is more prominent in a granite region, has extremely serious problems of circulation delay discharge, cutter damage and the like in slurry shield construction of a soft soil cutter head, and needs to be stopped for processing, and mainly comprises a grouting reinforcement method, a punching crushing method, a deep hole blasting method and a silo opening method, but has the problems of difficult detection, long period, high cost, large risk or poor effect to different degrees, and particularly can not be processed when boulders adjacent to the cutter head suddenly meet the boulder group in the tunneling process, so the processing method for the boulder group in the slurry shield tunneling process of the soft soil cutter head is provided to solve the problems.
Disclosure of Invention
The invention mainly aims to provide a method for treating an abrupt boulder group in a soft soil cutterhead slurry shield tunneling process, which solves the problems of difficult detection, long period, high cost, large risk or poor effect in the prior art, and particularly solves the problem that the boulder close to the cutterhead cannot be treated after the boulder group is abruptly encountered in the tunneling process.
In order to solve the technical problems, the invention adopts the following technical scheme: the method comprises the following steps:
s1, slightly backing the shield machine, opening a bin under pressure, checking and replacing damaged cutters;
s2, performing geological survey on the ground, confirming an approximate area of the boulder group, and arranging a plurality of rows of mutually meshed rotary digging pile hole sites in the area;
s3, sequentially carrying out specific survey on the rotary pile hole positions which are far from the cutter head of the shield machine and are close to each other, ascertaining the layer position and the thickness of the boulder of each rotary pile hole position, then carrying out rotary excavation on the rotary pile hole positions with the boulder by using a rotary excavator, digging out the boulder, and pouring inert mortar to an orifice by adopting a conduit method;
s4, before the construction of the rotary digging pile hole position closest to the first row of the cutter head of the shield machine, positioning guide wall construction is firstly carried out, then rotary digging construction is carried out on holes one by one, inert mortar recharging is not carried out in the process, the rotary digging depth is controlled to form a super digging groove below the bottom of the cutter head of the shield machine, and the depth of the super digging groove is larger than the boulder height;
s5, restoring tunneling of the shield machine by adopting a micro-speed mode, and pushing untreated boulders in a range in front of a cutter head into the first row of super-digging grooves;
s6, suspending tunneling, backfilling gravels on the ground into the super-digging groove to the bottom of the tunnel, and continuing to resume tunneling after depth measurement confirms backfilling elevation;
s7, after the cutter head of the shield machine completely passes through the first hole-discharging groove, backfilling sand on the first hole-discharging groove.
In the preferred scheme, the method for backing the shield machine adopts one of incision water pressure, telescopic hinging or bentonite injection around the shield body, the backing distance is five centimeters, and a mud film is established on the tunnel face.
In the preferred scheme, the depth of the geological survey exceeds one time of the hole diameter, the survey is firstly performed within the range of the tunnel along the longitudinal direction of the tunnel, and then the transverse survey is performed on the survey position with the boulder so as to confirm the approximate range of the boulder group;
the spacing between the hole site of the first row of rotary digging piles closest to the shield tunneling machine and the cutter head is controlled to be 30-40 cm.
In a preferred embodiment, the specific survey in step S3 is: and arranging a geological drilling hole on each rotary digging pile hole position, rotating the geological drilling hole by using a geological drilling machine, and ascertaining the horizon and the thickness of the boulder at each rotary digging pile hole position from far to near.
In a preferred embodiment, the specific manner of rotary digging in step S3 is as follows: and (3) performing rotary digging on all the rotary digging pile hole positions with the boulders and other four rotary digging pile hole positions engaged with the rotary digging pile hole positions, controlling the rotary digging depth to be at least 1m below the cutter head bottom, and filling wall protection slurry into the hole positions while rotary digging to prevent hole collapse.
In a preferred scheme, the inert mortar comprises the following components in percentage by weight: water, sand, fly ash, cement=240:700:450:15.
In the preferred scheme, before the construction is carried out on the rotary pile hole position of the third row closest to the cutter head of the shield machine, the mud water bin and the air cushion bin of the shield machine are replaced by full mud support, and the method specifically comprises the following steps: and (3) replacing the slurry in the slurry bin of the shield machine with high-viscosity bentonite slurry with the viscosity of more than 200S, and fully filling the air cushion bin of the shield machine with circulating slurry with lower viscosity to form a full slurry support.
In the preferred scheme, in the step S4, the positioning guide wall is Kong Hubi formed by high-viscosity bentonite slurry with viscosity above 60S, and the spin depth is controlled to be 50 cm higher than the boulder height below the cutter head bottom.
In a preferred scheme, the rotary digging step of the rotary digging machine comprises the following steps: firstly, using a soil taking barrel drill bit to dig a pile hole position to an orphan layer in a rotary way, then changing a rock crushing drill bit to dig the orphan layer in a rotary way, and finally changing a rock taking drill bit to take out the orphan;
the stone removing drill bit comprises a large boulder stone removing drill bit and a small boulder stone removing drill bit;
the large boulder stone-taking drill bit comprises a first cylindrical barrel with an opening at the lower end and a plurality of wedge-shaped blocks which are equidistantly arranged on the inner wall surface of the cylindrical barrel;
the small boulder stone-taking drill bit comprises a second cylindrical barrel with an opening at the lower end, an annular steel ring arranged at the center inside the second cylindrical barrel, and a plurality of connecting steel bars with ends tangent to the outer wall of the annular steel ring, wherein the other ends of the connecting steel bars are connected with the inner wall surface of the second cylindrical barrel, and the annular steel ring is higher than the connecting end of the connecting steel bars and the second cylindrical barrel to form a cone shape;
the open ends of the first cylinder and the second cylinder are provided with cutting teeth.
In the preferred scheme, after the untreated boulder in the front range of the cutter head is pushed into the first row of super-digging hole slots in the step S5, if the condition that the boulder height exceeds the super-digging hole slots occurs, the stone-taking drill bit of the rotary digging machine is replaced, the diameter of the replaced stone-taking drill bit is smaller than that of the original stone-taking drill bit, and then the boulder part which exceeds the super-digging hole slots is taken out until the boulder height is smaller than the depth of the super-digging hole slots.
The invention provides a processing method of sudden boulders in the soft soil cutterhead slurry shield tunneling process, which adopts a geological survey confirmation range, digs holes in a rotary way to take out boulders, and the shield pushes the boulders clung to the cutterhead into a super-digging groove, so that the encountered boulders are thoroughly processed, the construction efficiency is high, the effect is good, and no omission exists; simultaneously, the structure and the function characteristics of the slurry shield are fully utilized, dense slurry is adopted to protect the wall to carry out rotary excavation treatment on the isolated stones close to the cutterhead, the first hole depth is overdrawn, the isolated stones close to the cutterhead are pushed into the overdrawn groove through shield micro-motion propulsion, and the problem that the isolated stones close to the cutterhead cannot be treated is solved.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of the layout of the hole site and the geological drilling plane of a rotary drilling pile according to the invention;
FIG. 2 is a schematic diagram of the rotary drilling process range of the rotary drilling pile hole according to the present invention;
FIG. 3 is a schematic view of a boulder treatment in longitudinal section according to the present invention;
FIG. 4 is a side cross-sectional view of the construction of the large boulder extraction bit of the present invention;
FIG. 5 is a cross-sectional view of a down-plane cross-sectional structure of the large boulder extraction bit of the present invention;
FIG. 6 is a side cross-sectional view of the construction of the small boulder extraction bit of the present invention;
FIG. 7 is a cross-sectional view of a pilot section of the small boulder extraction drill bit of the present invention;
FIG. 8 is a schematic illustration of a rotary dredger of the present invention;
in the figure: a shield machine 1; rotary digging pile hole positions 2; geological drilling 3; positioning guide walls 4; a rotary digging machine 5; a large boulder stone-taking drill bit 6; a first cylindrical drum 601; wedge 602; cutting teeth 603; a small boulder extraction bit 701; connecting rebar 702; an annular steel ring 703.
Detailed Description
Example 1
As shown in fig. 1-7, a method for treating a sudden boulder group in a soft soil cutterhead slurry shield tunneling process comprises the following steps:
s1, the whole shield machine 1 is retreated for 5 centimeters by improving the water pressure of a cut, expanding and hinging or injecting bentonite around a shield body, a mud film is built on a face, and a damaged cutter is checked and replaced by opening a bin under pressure;
s2, after the tool is replaced, performing geological survey on the ground, wherein the survey depth exceeds one time of the hole diameter, performing survey in the tunnel range along the longitudinal direction of the tunnel, and performing transverse survey on the position with the boulder survey to confirm the approximate range of the boulder group;
s3, arranging a plurality of rows of mutually meshed rotary digging pile hole positions 2 in the approximate range of a Fang Gudan group in front of a cutter head of the shield machine 1, wherein the distance between the edge of the first row of rotary digging pile hole positions 2 and the cutter head is controlled to be 30-40 cm, taking a row of rotary digging pile hole positions 2 closest to the shield machine 1 as a first row, sequentially arranging the first row, and designing 1 geological drilling hole 3 at the center of each rotary digging pile hole position 2;
s4, using a geological drilling machine to drill the geological drilling holes 3, and ascertaining the layer and thickness of the boulder of each rotary digging pile hole position 2 from far to near;
s5, if the cutter head excavation range of the shield machine 1 detects boulders, performing rotary excavation treatment on the pile position and other 4 pile positions meshed with the pile position by using a rotary excavating machine 5, controlling the depth to be at least 1m below the bottom of a cutter head of the shield machine 1, pouring wall protection slurry into a hole site while rotary excavation to prevent hole collapse, pouring inert mortar to the hole site by adopting a conduit method after stone extraction is completed, wherein the inert mortar comprises water, sand, fly ash and cement=240:700:450:15, and if the development of boulders is not detected in the cutter head excavation range of the shield machine 1, performing rotary excavation treatment on the pile position;
s6, before construction of the third row of rotary digging pile hole sites 2, completely replacing slurry in a slurry bin of the shield machine 1 with high-viscosity bentonite slurry with the viscosity of more than 200S, and completely filling a gas cushion bin of the shield machine 1 with circulating slurry with lower viscosity to form a full slurry support;
s7, the first row of rotary digging pile hole sites 2 are constructed finally, because the rotary digging pile hole sites are closer to a cutter head, in order to prevent deviation of an orifice and collapse of the orifice, a positioning guide wall is adopted, the positioning guide wall extends from the ground surface to the inner wall of the first row of rotary digging pile hole sites 2, the positioning guide wall is Kong Hubi formed by high-viscosity bentonite slurry with viscosity more than 60S, then the first row of rotary digging pile hole sites 2 are dug out of the boulders one by one, the rotary digging depth is controlled to form a super digging groove below the bottom of a cutter disc of the shield machine 1, and the depth of the super digging groove is larger than the boulder height, and in the embodiment, the depth of the super digging groove is specifically 50 centimeters higher than the boulder height;
s8, adopting a micro-speed mode to restore tunneling of the shield machine 1, and pushing untreated boulders in the range of 30-40 centimeters in front of a cutter head to fall into the super-digging groove;
s9, suspending tunneling, filling broken stone into the super-digging groove to the bottom of the tunnel by ground backfilling, and continuing to resume tunneling after depth measurement confirms backfilling elevation;
s10, the cutter head of the shield machine 1 completely passes through more than 1m of the first row of hole grooves, and sand backfilling is carried out on the 1 st row of holes.
In a preferred embodiment, in step S5, the rotary digging step of the rotary digging machine 5 includes: firstly, using a soil taking barrel drill bit to dig a rotary digging pile hole site 2 to an orphan layer, then changing a rock crushing drill bit to dig the orphan layer in a rotary way, and finally changing a rock taking drill bit to take out the orphan;
the stone removing drill comprises a large orphan stone removing drill 6 and a small orphan stone removing drill 7;
the large boulder stone drill 6 includes a first cylindrical drum 601 with an opening at the lower end, and a plurality of wedge blocks 602 equidistantly disposed on the inner wall surface of the cylindrical drum 601, in this embodiment, the number of the wedge blocks 602 is three.
When the stone extractor is used, the stone can be clamped in the gaps of the three wedge blocks 602, and meanwhile, the wedge faces of the wedge blocks 602 are convenient to be better embedded into the stone extractor, so that the stone extractor is convenient to take out the stone extractor with a larger body shape from the rotary digging holes.
The small boulder stone drill 7 comprises a second cylindrical drum 701 with an opening at the lower end, an annular steel ring 703 arranged at the center inside the second cylindrical drum 701, and a plurality of connecting steel bars 702 with ends tangent to the outer wall of the annular steel ring 703, wherein the other ends of the connecting steel bars 702 are connected with the inner wall surface of the second cylindrical drum 701, and the annular steel ring 603 is higher than the connecting end of the connecting steel bars 702 and the second cylindrical drum 701 to form a cone shape;
in this embodiment, the number of the connecting bars 702 is six, and the six connecting bars 702 are equidistantly arranged outside the annular steel ring 703.
When in use, the conical shape formed between the connecting steel bars 702 and the annular steel rings 703 is convenient to use, and the edge of the small-sized boulder or the large boulder is taken out, so that the problem that the edge of the small-sized boulder or the large boulder is inconvenient to take out is solved.
The use of the large boulder extraction drill bit 6 and the small boulder extraction drill bit 7 is determined according to the boulder contacted by the rotary hole, and the large boulder extraction drill bit 6 and the small boulder extraction drill bit 7 may be used to extract the boulder in sequence.
The open ends of the first cylinder 601 and the second cylinder 701 are provided with cutting teeth 604, so that the stone extraction efficiency is improved.
In the preferred scheme, if step S8 is performed, after the unprocessed boulder is pushed into the super-digging groove, the condition that the height of the boulder exceeds the super-digging groove occurs, the stone picking drill bit of the rotary digging machine 5 is replaced, the diameter of the replaced stone picking drill bit is smaller than that of the original stone picking drill bit, and then the boulder part which exceeds the super-digging groove is taken out until the height of the boulder is smaller than the depth of the super-digging groove, in this embodiment, the diameter of the replaced stone picking drill bit is smaller than that of the original stone picking drill bit by 30 cm;
in the preferred scheme, as shown in fig. 8, in step S5, when the existing part of the boulder exceeds the rotary pile hole site 2 and the other four rotary pile hole sites 2 engaged with the rotary pile hole site, the drill rod of the rotary excavator 5 can be adjusted to be inclined appropriately within the range of five rotary pile hole sites, so as to accurately excavate the boulder of the residual part.
The above embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (10)
1. The processing method of the sudden boulder group in the soft soil cutterhead slurry shield tunneling process is characterized by comprising the following steps: the method comprises the following steps:
s1, slightly backing the shield machine (1), opening a bin under pressure, checking and replacing damaged cutters;
s2, performing geological survey on the ground, confirming an approximate area of the boulder group, and arranging a plurality of rows of mutually meshed rotary digging pile hole positions (2) in the area;
s3, sequentially carrying out specific survey on rotary pile hole positions which are far from a cutter head of the shield machine (1) from far to near, ascertaining the layer position and the thickness of the boulder of each rotary pile hole position (2), then carrying out rotary excavation on the rotary pile hole positions (2) with the boulder by utilizing a rotary excavator (5), digging out the boulder, and pouring inert mortar to an orifice by adopting a conduit method;
s4, before the construction of the rotary digging pile hole position (2) closest to the first row of the cutter head of the shield machine (1), firstly constructing a positioning guide wall (4), then carrying out rotary digging construction on holes one by one, and in the process, carrying out no inert mortar recharging, wherein the rotary digging depth is controlled to be less than the bottom of the cutter head of the shield machine (1) to form a super digging groove, and the depth of the super digging groove is greater than the height of the boulder;
s5, adopting a micro-speed mode to restore tunneling of the shield machine (1), and pushing untreated boulders in the front range of the cutterhead into the first row of ultra-digging grooves;
s6, suspending tunneling, backfilling gravels on the ground into the super-digging groove to the bottom of the tunnel, and continuing to resume tunneling after depth measurement confirms backfilling elevation;
s7, after the cutterhead of the shield machine (1) completely passes through the first hole-discharging groove, backfilling sand on the first hole-discharging groove.
2. The method for treating the sudden boulder group in the soft soil cutterhead slurry shield tunneling process according to claim 1, which is characterized in that: the method for backing the shield machine (1) adopts one of incision water pressure, telescopic hinging or bentonite injection around the shield body, the backing distance is five centimeters, and a mud film is established on the face.
3. The method for treating the sudden boulder group in the soft soil cutterhead slurry shield tunneling process according to claim 1, which is characterized in that: the depth of the geological survey exceeds one time of the hole diameter, the survey is firstly performed in the tunnel range along the tunnel longitudinal direction, and then the transverse survey is performed on the survey position with the boulders so as to confirm the approximate range of the boulders;
the distance between the first row of rotary digging pile holes (2) closest to the shield tunneling machine (1) and the cutter head is controlled to be 30-40 cm.
4. The method for treating the sudden boulder group in the soft soil cutterhead slurry shield tunneling process according to claim 1, which is characterized in that: the specific survey in step S3 is: and arranging a geological drilling hole (3) on each rotary pile hole (2), and rotating the geological drilling hole (3) by using a geological drilling machine to ascertain the layer position and the thickness of the boulder of each rotary pile hole (2) from far to near.
5. The method for treating the sudden boulder group in the soft soil cutterhead slurry shield tunneling process according to claim 4, which is characterized in that: the concrete method of the rotary digging in the step S3 is as follows: the rotary digging pile hole position (2) with the boulder and other four rotary digging pile hole positions (2) engaged with the rotary digging pile hole position are all subjected to rotary digging, the rotary digging depth is controlled to be at least 1m below the cutter head bottom, and wall protection slurry is poured into the hole positions during rotary digging, so that hole collapse is prevented.
6. The method for treating the sudden boulder group in the soft soil cutterhead slurry shield tunneling process according to claim 1, which is characterized in that: the proportion of the inert mortar is as follows: water, sand, fly ash, cement=240:700:450:15.
7. The method for treating the sudden boulder group in the soft soil cutterhead slurry shield tunneling process according to claim 1, which is characterized in that: before the construction of a third row of rotary digging pile hole positions (2) closest to a cutter head of a shield machine (1), replacing a mud water bin and an air cushion bin of the shield machine (1) with full mud support, wherein the method specifically comprises the following steps: the slurry in the slurry sump of the shield machine (1) is replaced by high-viscosity bentonite slurry with the viscosity of more than 200S, and the air cushion sump of the shield machine (1) is filled with circulating slurry with lower viscosity to form a full slurry support.
8. The method for treating the sudden boulder group in the soft soil cutterhead slurry shield tunneling process according to claim 1, which is characterized in that: in the step S4, the positioning guide wall (4) is Kong Hubi formed by high-viscosity bentonite slurry with the viscosity of more than 60S, and the spin depth is controlled to be 50 cm higher than the boulder height below the cutter head bottom.
9. The method for treating the sudden boulder group in the soft soil cutterhead slurry shield tunneling process according to claim 5, which is characterized in that: the rotary digging step of the rotary digging machine (5) comprises the following steps: firstly, using a soil taking barrel drill bit to dig a pile hole position (2) to an orphan layer in a rotary way, then replacing a rock crushing drill bit to dig the orphan layer in a rotary way, and finally replacing the rock taking drill bit to take out the orphan;
the stone taking drill comprises a large orphan stone taking drill (6) and a small orphan stone taking drill (7);
the large boulder stone drill (6) comprises a first cylindrical barrel (601) with an opening at the lower end and a plurality of wedge-shaped blocks (602) which are equidistantly arranged on the inner wall surface of the cylindrical barrel (601);
the small boulder stone drill (7) comprises a second cylindrical barrel (701) with an opening at the lower end, an annular steel ring (703) arranged at the inner center of the second cylindrical barrel (701), and a plurality of connecting steel bars (702) with ends tangent to the outer wall of the annular steel ring (703), wherein the other ends of the connecting steel bars (702) are connected with the inner wall surface of the second cylindrical barrel (701), and the annular steel ring (603) is higher than the connecting end of the connecting steel bars (702) and the second cylindrical barrel (701) to form a cone shape;
the open ends of the first cylinder (601) and the second cylinder (701) are provided with cutting teeth (604).
10. The method for treating the sudden boulder group in the soft soil cutterhead slurry shield tunneling process according to claim 9, which is characterized in that: in the step S5, after the untreated boulder in the front range of the cutter head is pushed into the first row of super-digging hole slots, if the condition that the boulder height exceeds the super-digging hole slots occurs, replacing the stone-taking drill bit of the rotary digging machine (5), wherein the diameter of the replaced stone-taking drill bit is smaller than that of the original stone-taking drill bit, and then taking out the boulder part which exceeds the super-digging hole slots until the boulder height is smaller than the depth of the super-digging hole slots.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310932964.9A CN116988801A (en) | 2023-07-27 | 2023-07-27 | Method for treating sudden boulder group in soft soil cutterhead slurry shield tunneling process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310932964.9A CN116988801A (en) | 2023-07-27 | 2023-07-27 | Method for treating sudden boulder group in soft soil cutterhead slurry shield tunneling process |
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| Publication Number | Publication Date |
|---|---|
| CN116988801A true CN116988801A (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310932964.9A Pending CN116988801A (en) | 2023-07-27 | 2023-07-27 | Method for treating sudden boulder group in soft soil cutterhead slurry shield tunneling process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116988801A (en) |
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2023
- 2023-07-27 CN CN202310932964.9A patent/CN116988801A/en active Pending
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