CN116792102B - High-precision detection and treatment method for granite spherical weathered body in construction stage - Google Patents
High-precision detection and treatment method for granite spherical weathered body in construction stage Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000010276 construction Methods 0.000 title claims abstract description 28
- 239000010438 granite Substances 0.000 title claims abstract description 27
- 238000011161 development Methods 0.000 claims abstract description 67
- 238000005422 blasting Methods 0.000 claims abstract description 52
- 238000011835 investigation Methods 0.000 claims abstract description 34
- 239000002360 explosive Substances 0.000 claims abstract description 21
- 230000005641 tunneling Effects 0.000 claims abstract description 19
- 238000012795 verification Methods 0.000 claims abstract description 18
- 238000013461 design Methods 0.000 claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 16
- 238000003708 edge detection Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000011435 rock Substances 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 230000009172 bursting Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000005474 detonation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013524 data verification Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000011850 initial investigation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention belongs to the technical field of shield tunnel engineering investigation design and construction in granite areas, and provides a high-precision detection and treatment method for spherical weathering of granite in a construction stage, which comprises the following steps: acquiring early-stage detailed investigation stage investigation result data, performing ground investigation in the range of the shield tunnel, and performing special boulder investigation by dividing the boulder development area by using the detection result in combination with ground surface geophysical prospecting; performing boulder edge detection investigation on the drill hole exposing boulders; performing special design on the boulder blasting treatment; then embedding PVC pipe, embedding detonator and explosive, and then blasting; and (5) drilling and coring verification is carried out on the blasting effect. The method can finely survey the development condition and the property of the boulder in the range of the shield tunnel, and the pre-bursting treatment of the boulder reduces the influence of the boulder on the shield tunneling, and has the advantages of reducing the frequency of the boulder in the shield warehouse-opening treatment, greatly reducing the construction risk and the investment cost and the like.
Description
Technical Field
The invention belongs to the technical field of shield tunnel engineering investigation design and construction in granite areas, and particularly relates to a high-precision detection and treatment method for spherical weathering of granite in a construction stage.
Background
Currently, with the rapid development of Chinese economy, the continuous expansion of urban scale and the fusion development of regional economy, large-scale urban rail transit, urban railways, comprehensive pipe galleries and other underground projects are greatly developed, and complex geological conditions and objective environmental factors bring great challenges to the investigation design and construction of projects. Especially in granite areas, the objective existence of spherical weathered bodies (commonly called as "boulders") of granite and the high strength and uneasy breaking property of the spherical weathered bodies bring technical challenges and difficulties to shield tunneling. The formation cause of the boulder is complex, the development scale is different, the distribution is random, no obvious regularity and continuity exist, and the engineering geological properties are difficult to find. Numerous scholars and engineering technicians have developed research and attempts at exploration means and methods. The Chinese patent of application publication No. CN102518442A discloses a method for processing a boulder group in a shield tunneling ditch region, wherein the method comprises the steps of firstly finding out a region where boulders possibly appear according to a geological survey report; arranging test holes in the longitudinal direction of a tunnel in an orphan area, placing PVC pipes in the test holes, arranging dense small holes on the walls of the PVC pipes, sealing the bottoms of the PVC pipes, filling water into the test holes, respectively placing electrodes in the PVC pipes in two adjacent holes, performing cross-hole detection by adopting a high-density resistivity meter, collecting data, and determining the orphan position; through blasting design optimization, the explosive package is accurately positioned by using the counterweight, and a row-by-row blasting mode is adopted after the space is generated by extruding peripheral holes of the boulder by blasting. As another example, chinese patent application publication No. CN110924956a discloses a method for tunneling tunnel shield including a fully weathered granite orphan development stratum and a bedrock protruding section, a targeted tunneling method is provided for the fully weathered granite orphan development stratum and the bedrock protruding section, the fully weathered granite orphan development stratum is constructed by adopting a construction method of detecting before processing, and the seabed bedrock protruding section is constructed by adopting a method of blasting in sea and grouting reinforcement. The existing investigation and disposal methods have poor effects, and particularly, under the condition that conventional geological drilling is difficult to implement aiming at a dense area of a building (structure), the existence of underground boulders brings great potential safety hazards to the shield tunneling of a tunnel.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention provides the high-precision detection and treatment method for the spherical weathering of granite in the construction stage, which can finely survey the development condition and the property of the boulder in the range of a shield tunnel, and reduce the influence of the boulder on shield tunneling through pre-bursting treatment of the boulder, and has the advantages of reducing the frequency of the boulder in shield warehouse opening treatment, greatly reducing construction risks and investment cost and the like.
The technical scheme adopted by the invention is as follows: the high-precision detection and treatment method for the granite spherical weathered body in the construction stage comprises the following steps:
step one, acquiring early-stage detailed investigation result data, performing ground investigation in the range of a shield tunnel, and determining a ground surface geophysical prospecting detection area;
performing ground surface geophysical prospecting detection in the ground surface geophysical prospecting detection area to form geophysical prospecting results and delineating a geophysical prospecting abnormal area;
step three, drilling verification is carried out in the geophysical prospecting abnormal region, an orphan rock core is collected, and a saturated uniaxial compressive strength test is carried out on the orphan rock core to form a verification result;
step four, comparing and analyzing the verification result and the geophysical prospecting result, revising the geophysical prospecting result, dividing the orphan development area, and performing orphan special investigation;
fifthly, performing boulder detection and edge exploration on the drill holes exposing boulders in the boulder development area until the boulders are detected to the edge of the shield tunnel structure;
step six, performing special design on the boulder blasting treatment according to the boulder edge detection investigation result;
step seven, according to the special design of the boulder blasting treatment, embedding a PVC pipe in the drill hole exposing the boulder, embedding a detonator and an explosive in the PVC pipe, and then blasting;
and step eight, drilling and coring verification is carried out on the blasting effect, and if the requirement of normal tunneling of the shield tunneling machine is not met, the step seven and the step eight are carried out again.
Further, in the second step, the earth surface geophysical prospecting means that the geophysical prospecting line is arranged above the central line of the shield tunnel by using a micro-motion and transient electromagnetic method; the micro-motion detection measuring point adopts a point distance of 5m, and the transient electromagnetic measuring point adopts a point distance of 2.5 m.
Further, in the fourth step, revising the geophysical prospecting result according to the verification result; dividing an orphan development area according to the revised geophysical prospecting result, wherein the orphan development area is divided into an orphan strong development area, an orphan medium development area, an orphan weak development area and an orphan micro development area; arranging corresponding orphan special investigation schemes aiming at different orphan development areas: arranging a row of boulder encryption geological drill holes with the spacing of 5m, 5m and 10m above a tunnel central line for the boulder strong development area, the boulder medium development area and the boulder weak development area respectively for detail exploration; no additional geological drill holes are arranged for the boulder micro-development zone.
Further, in the fourth step, the basis for dividing the orphan development area according to the revised geophysical prospecting result is as follows:
the area ratio sigma=a/B of the segment boulders is calculated,
wherein A is the boulder area outlined in the geophysical prospecting result section; b is the area of granite residual soil, full weathering and soil-like strong weathering stratum in the geophysical prospecting result section;
when sigma is more than or equal to 3%, the plant is an boulder strong development area; when sigma is more than or equal to 1% and less than 3%, the plant is an orphan medium development area; when sigma is more than or equal to 0.5% and less than 1%, the plant is an boulder weak development area; sigma < 0.5%, is the boulder micro-development area.
Further, in the fifth step, 4 holes are respectively arranged along the shield tunnel trend and the vertical tunnel trend with the hole which reveals the boulder as the center, the distance between the hole and the center hole is 1m, boulder edge detection is performed, and the like until the edge of the tunnel structure is detected; and meanwhile, collecting an orphan core, and obtaining the strength of the orphan core.
Further, in the sixth step, the performing special design of the boulder blasting process is as follows: taking the drill hole exposing the boulder as a blast hole, calculating the length of the explosive charge of the blast hole according to the exposure condition of the boulder, loading the explosive and the detonator into a PVC pipe with the diameter of 75mm, and if water and a small amount of slurry in the blast hole influence the sinking of the explosive charge, properly weighting the explosive charge;
firstly blasting the blastholes at the edge, then blasting the free surface generated by extruding surrounding soil layers by using the blastholes at the edge, and then detonating the blastholes in the middle one by one;
when single blast hole single body blasting is performed, the charging length is the same as the thickness of the boulder; when a plurality of blast holes are singly blasted, two adjacent blast holes are filled, wherein one blast hole is filled to the bottom of the boulder, the top surface of the boulder is left for 10cm without filling, the bottom of the other blast hole is 10cm away from the bottom surface of the boulder, the other blast hole is filled to the bottom of the blast hole, and the top surface of the boulder is left for 10cm without filling;
before blasting operation, a sand bag and iron plate combined protection system is arranged at the hole opening of the blast hole.
Further, in the sixth step, the blasting explosive amount per unit volume of the boulder is: q=k·q 0 In kg/m 3 Wherein q 0 The unit consumption for underwater drilling and blasting is q 0 =0.45+ (0.05 to 0.15) H, where H is water depth; k is a correction coefficient of the underground rock mass, and 1.0-2.0 is taken.
Further, in the sixth step, a continuous charging structure or a sectional and spaced charging structure is adopted according to the thickness and strength change of the boulder and the requirements of surface building and pipeline protection.
In the seventh step, the blasthole is detonated by adopting forward charge, the detonating primer is detonated by adopting a detonating tube primer or a detonating needle, and the detonating primer and the detonating needle belong to two non-electric detonating circuits respectively, and the two sets of the circuits are detonated after being connected in parallel.
Further, in the step eight, an engineering driller double-pipe coring mode is adopted to collect the orphan core of the blasting area, and when the block diameter of the orphan core is larger than 30cm, the step seven and the step eight are carried out again until the block diameter of the collected orphan core is not larger than 30 cm.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the combination means of 'construction diagram design stage investigation, regional geophysical prospecting and construction stage special investigation' to carry out fine investigation on the development condition of the boulder in the granite region, and mutual verification of detection results, thereby having the advantages of short construction time consumption, low labor intensity, high working efficiency, high investigation accuracy and the like.
2. The invention provides a method for improving the detection precision and the detection efficiency of spherical weathered bodies in granite areas, which further finds out the development scale, the size and the range of boulders in detail, provides geological basis for the special design of boulder blasting treatment, and reduces geological risks of shield tunneling construction.
3. The invention adopts the comprehensive geological investigation arrangement modes in the geophysical prospecting and drilling, early stage and construction process, can be mutually compared and contrasted, accurately divides the range of the orphan development area, then carries out orphan special investigation, pointedly improves the detection precision, and avoids the fund waste and the labor cost caused by blind exploration.
4. According to the invention, as the explosion treatment is carried out on the ascertained boulders in advance, the influence of the boulders on shield tunneling is reduced, the frequency of the shield warehouse-opening treatment of the boulders is reduced, and the construction risk and the investment cost are greatly reduced.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a longitudinal arrangement of a geophysical survey line according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a verification borehole layout in accordance with an embodiment of the present invention;
FIG. 4 is a schematic illustration of an orphan encrypted geological borehole layout according to an embodiment of the invention;
FIG. 5 is a schematic diagram of an orphan edge-detection drilling arrangement according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an orphan blasting process according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the specific embodiments, so that those skilled in the art can better understand the technical solutions of the present invention.
Embodiments of the present invention provide a high precision detection and treatment method for granite spherical weathered body at construction stage, as shown in FIG. 1, comprising the steps of:
step one, acquiring early-stage detailed investigation result data, performing ground investigation in the range of the shield tunnel, and determining a ground surface geophysical prospecting detection area. Specifically, the boreholes at the initial and detailed investigation stages are all arranged on the outer side of the shield tunnel, and the exposed boulders cannot truly reflect the boulder development condition in the shield tunnel range, so that a ground geophysical prospecting method and means with strong geological conditions and anti-interference capability suitable for a measured area are required to be selected according to the earlier investigation results and ground conditions.
And secondly, performing ground surface geophysical prospecting in the ground surface geophysical prospecting area to form a geophysical prospecting result and delineate a geophysical prospecting abnormal area. The earth surface geophysical prospecting is a method utilizing micro-motion and transient electromagnetic, as shown in fig. 2, and a geophysical prospecting line is arranged above the central line of the shield tunnel during the detection; the micro-motion detection measuring point adopts a point distance of 5m, and the transient electromagnetic measuring point adopts a point distance of 2.5 m. The method combines the early initial investigation and the detailed investigation of the investigation results, integrates the two geophysical prospecting methods, interprets the obtained geophysical prospecting results comprehensively, and defines the geophysical prospecting abnormal area.
And thirdly, drilling verification is carried out in the geophysical prospecting abnormal region, as shown in fig. 3, an orphan core is collected, and a saturated uniaxial compressive strength test is carried out on the orphan core to form a verification result.
And step four, comparing and analyzing the verification result and the geophysical prospecting result, revising the geophysical prospecting result, dividing the orphan development area, and performing orphan special investigation.
Specifically, revising the geophysical prospecting result obtained in the second step according to the verification result obtained in the third step; dividing an orphan development area according to the revised geophysical prospecting result, wherein the orphan development area is divided into an orphan strong development area, an orphan medium development area, an orphan weak development area and an orphan micro development area; arranging corresponding orphan special investigation schemes aiming at different orphan development areas: for the boulder strong development area, the boulder medium development area and the boulder weak development area, a row of boulder encryption geological drill holes with the spacing of 5m, 5m and 10m are respectively arranged above the central line of the tunnel for detailed exploration, as shown in fig. 4; no additional geological drill holes are arranged for the boulder micro-development zone.
The basis for dividing the boulder development area according to the revised geophysical prospecting result is as follows:
the area ratio sigma=a/B of the segment boulders is calculated,
wherein A is the boulder area outlined in the geophysical prospecting result section; b is the area of granite residual soil, full weathering and soil-like strong weathering stratum in the geophysical prospecting result section;
when sigma is more than or equal to 3%, the plant is an boulder strong development area; when sigma is more than or equal to 1% and less than 3%, the plant is an orphan medium development area; when sigma is more than or equal to 0.5% and less than 1%, the plant is an boulder weak development area; sigma < 0.5%, is the boulder micro-development area.
Fifthly, performing boulder edge detection exploration on the drill holes of the exposed boulders in the boulder development area until the boulders are detected to the side line of the shield tunnel structure, and further ascertaining the boulder size, the boulder range and the boulder depth. The disclosure of the drilling of the boulder refers to the drilling of the boulder core.
Specifically, 4 holes are respectively arranged along the shield tunnel trend and the vertical tunnel trend with the hole exposing the boulder as the center, as shown in fig. 5, the distances between the holes and the center hole are 1m, boulder edge detection is performed, and the like until the edge of the tunnel structure is detected; and meanwhile, collecting an orphan core, and obtaining the strength of the orphan core.
And step six, performing special design on the boulder blasting treatment according to the boulder edge detection investigation result.
The special design of the boulder blasting treatment is as follows: as shown in fig. 6, taking the drill hole exposing the boulder as a blast hole, calculating the length of the explosive charge of the blast hole according to the exposure condition of the boulder, loading the explosive and the detonator into a PVC pipe with the diameter of 75mm, and if water and a small amount of slurry in the blast hole influence the sinking of the explosive charge, properly weighting the explosive charge;
firstly blasting the blastholes at the edge, then blasting the free surface generated by extruding surrounding soil layers by using the blastholes at the edge, and then detonating the blastholes in the middle one by one;
when single blast hole single body blasting is performed, the charging length is the same as the thickness of the boulder; when a plurality of blast holes are singly blasted, two adjacent blast holes are filled, wherein one blast hole is filled to the bottom of the boulder, the top surface of the boulder is left for 10cm without filling, the bottom of the other blast hole is 10cm away from the bottom surface of the boulder, the other blast hole is filled to the bottom of the blast hole, and the top surface of the boulder is left for 10cm without filling;
before blasting operation, a sand bag and iron plate combined protection system is arranged at the hole opening of the blast hole.
Wherein, the explosive amount of the boulder in unit volume is as follows: q=k·q 0 In kg/m 3 Wherein q 0 The unit consumption for underwater drilling and blasting is q 0 =0.45+ (0.05 to 0.15) H, where H is water depth in m; k is the correction coefficient of the underground rock mass and is the lithologyThe coefficient related to the buried depth and the surrounding medium is 1.0-2.0. After the explosive amount is calculated by referring to the formula in the blasting operation process, the blasting parameters are adjusted according to the blasting vibration condition and the blasting effect. When in loading, a continuous loading structure or a sectional and spaced loading structure is adopted according to the thickness and strength change of the boulder and the requirements of surface building and pipeline protection.
And seventhly, embedding a PVC pipe with the diameter of 75mm into the drilled hole exposing the boulder according to the special design of the boulder blasting treatment, embedding a detonator and an explosive into the PVC pipe, and then performing the blasting treatment. The blast hole adopts forward charge for detonation, the detonating detonator adopts detonating tube detonator or detonating needle, and the detonating tube detonator or the detonating needle respectively belongs to two non-electric detonating circuits, and the two sets of circuits are connected in parallel for detonation.
And step eight, drilling and coring verification is carried out on the blasting effect so as to ensure that shield tunneling is carried out smoothly, and the frequency of shield under-pressure bin opening to treat boulders is reduced so as to ensure shield tunneling safety.
The method has the advantages that the double-pipe coring mode of the engineering driller is adopted, the boulder core of the blasting area is collected, when the block diameter is smaller than 30cm, the blasting effect is good, and the normal tunneling requirement of the shield tunneling machine can be met; and when the block diameter of the boulder core is larger than 30cm, the requirements of normal tunneling of the shield machine are not met, and the step seven and the step eight are carried out again until the block diameter of the acquired boulder core is not larger than 30 cm.
The invention pays attention to mutual verification of data of various methods and various stages in the reconnaissance process so as to ensure the accuracy of boulder detection, provide geological basis for the special design of boulder blasting, drill and core again after blasting is finished to verify blasting effect, eliminate the influence of boulder on shield tunneling, reduce the frequency of shield warehouse opening to treat boulder, and greatly reduce construction risk and investment cost.
The present invention has been described in detail by way of examples, but the description is merely exemplary of the invention and should not be construed as limiting the scope of the invention. The scope of the invention is defined by the claims. In the technical scheme of the invention, or under the inspired by the technical scheme of the invention, similar technical schemes are designed to achieve the technical effects, or equivalent changes and improvements to the application scope are still included in the protection scope of the patent coverage of the invention.
Claims (8)
1. The high-precision detection and treatment method for the granite spherical weathered body in the construction stage is characterized by comprising the following steps of:
step one, acquiring early-stage detailed investigation result data, performing ground investigation in the range of a shield tunnel, and determining a ground surface geophysical prospecting detection area;
performing ground surface geophysical prospecting detection in the ground surface geophysical prospecting detection area to form geophysical prospecting results and delineating a geophysical prospecting abnormal area;
step three, drilling verification is carried out in the geophysical prospecting abnormal region, an orphan rock core is collected, and a saturated uniaxial compressive strength test is carried out on the orphan rock core to form a verification result;
step four, comparing and analyzing the verification result and the geophysical prospecting result, revising the geophysical prospecting result, dividing the orphan development area, and performing orphan special investigation;
fifthly, performing boulder detection and edge exploration on the drill holes exposing boulders in the boulder development area until the boulders are detected to the edge of the shield tunnel structure;
step six, performing special design on the boulder blasting treatment according to the boulder edge detection investigation result;
step seven, according to the special design of the boulder blasting treatment, embedding a PVC pipe in the drill hole exposing the boulder, embedding a detonator and an explosive in the PVC pipe, and then blasting;
step eight, drilling and coring verification is carried out on the blasting effect, and if the requirement of normal tunneling of the shield tunneling machine is not met, the step seven and the step eight are carried out again;
in step four, revising the geophysical prospecting effort according to the verification effort; dividing an orphan development area according to the revised geophysical prospecting result, wherein the orphan development area is divided into an orphan strong development area, an orphan medium development area, an orphan weak development area and an orphan micro development area; arranging corresponding orphan special investigation schemes aiming at different orphan development areas: arranging a row of boulder encryption geological drill holes with the spacing of 5m, 5m and 10m above a tunnel central line for the boulder strong development area, the boulder medium development area and the boulder weak development area respectively for detail exploration; no additional geological drill holes are arranged for the boulder micro-development zone;
in the fourth step, the basis for dividing the boulder development area according to the revised geophysical prospecting result is as follows:
the area ratio sigma=a/B of the segment boulders is calculated,
wherein A is the boulder area outlined in the geophysical prospecting result section; b is the area of granite residual soil, full weathering and soil-like strong weathering stratum in the geophysical prospecting result section;
when sigma is more than or equal to 3%, the plant is an boulder strong development area; when sigma is more than or equal to 1% and less than 3%, the plant is an orphan medium development area; when sigma is more than or equal to 0.5% and less than 1%, the plant is an boulder weak development area; sigma < 0.5%, is the boulder micro-development area.
2. The method for high-precision detection and treatment of granite spherical weathered body in construction stage according to claim 1, wherein in the second step, the earth surface geophysical prospecting means that a geophysical prospecting line is arranged above the center line of a shield tunnel by using a micro-motion and transient electromagnetic method; the micro-motion detection measuring point adopts a point distance of 5m, and the transient electromagnetic measuring point adopts a point distance of 2.5 m.
3. The method for high-precision detection and treatment of granite spherical weathered body in construction stage according to claim 1, wherein in the fifth step, 4 holes are respectively arranged along the shield tunnel trend and the vertical tunnel trend with the hole exposing the boulder as the center, the distance between the 4 holes and the center hole is 1m, boulder edge detection is performed, and so on until the tunnel structure edge is detected; and meanwhile, collecting an orphan core, and obtaining the strength of the orphan core.
4. The method for high-precision detection and treatment of spherical weathering of granite at the construction stage according to claim 1, wherein in step six, the boulder blasting treatment is specially designed for: taking the drill hole exposing the boulder as a blast hole, calculating the length of the explosive charge of the blast hole according to the exposure condition of the boulder, loading the explosive and the detonator into a PVC pipe with the diameter of 75mm, and if water and a small amount of slurry in the blast hole influence the sinking of the explosive charge, properly weighting the explosive charge;
firstly blasting the blastholes at the edge, then blasting the free surface generated by extruding surrounding soil layers by using the blastholes at the edge, and then detonating the blastholes in the middle one by one;
when single blast hole single body blasting is performed, the charging length is the same as the thickness of the boulder; when a plurality of blast holes are singly blasted, two adjacent blast holes are filled, wherein one blast hole is filled to the bottom of the boulder, the top surface of the boulder is left for 10cm without filling, the bottom of the other blast hole is 10cm away from the bottom surface of the boulder, the other blast hole is filled to the bottom of the blast hole, and the top surface of the boulder is left for 10cm without filling;
before blasting operation, a sand bag and iron plate combined protection system is arranged at the hole opening of the blast hole.
5. The method for high-precision detection and treatment of granite spherical weathered body at construction stage according to claim 4, wherein in step six, the amount of blasting explosive per unit volume of boulder is: q=k·q 0 In kg/m 3 Wherein q 0 The unit consumption for underwater drilling and blasting is q 0 =0.45+ (0.05 to 0.15) H, where H is water depth; k is a correction coefficient of the underground rock mass, and 1.0-2.0 is taken.
6. The method for high-precision detection and treatment of granite spherical weathered body in construction stage according to claim 4, wherein in step six, a continuous charging structure or a segmented and spaced charging structure is adopted according to the thickness and strength change of the boulder and the requirements of surface building and pipeline protection.
7. The method for high-precision detection and disposal of granite spherical weathered body in construction stage according to claim 1, wherein in the seventh step, the blasthole is detonated by adopting forward charge, the detonating detonator is detonated by adopting detonating tube detonator or detonating needle, and the detonating detonator and the detonating needle belong to two non-electric detonating circuits respectively, and the two sets of circuits are detonated after being connected in parallel.
8. The method for high-precision detection and treatment of granite spherical weathered body in construction stage according to claim 1, wherein in the step eight, an isolated rock core of a blasting area is collected by adopting a double-pipe coring mode of an engineering drilling machine, and when the block diameter of the isolated rock core is larger than 30cm, the steps seven and eight are repeated until the block diameter of the collected isolated rock core is not larger than 30 cm.
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| CN106371142A (en) * | 2016-08-18 | 2017-02-01 | 安徽惠洲地质安全研究院股份有限公司 | Coil for transient electromagnetic explorations and the application method thereof |
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| CN110513114A (en) * | 2019-08-08 | 2019-11-29 | 中国建筑第四工程局有限公司 | A kind of shield-tunneling construction passes through the construction of high-strength boulder group |
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