CN103982191A - Reserved soil column up-down-asynchronous and left-right-synchronous excavation method - Google Patents
Reserved soil column up-down-asynchronous and left-right-synchronous excavation method Download PDFInfo
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- CN103982191A CN103982191A CN201410247119.9A CN201410247119A CN103982191A CN 103982191 A CN103982191 A CN 103982191A CN 201410247119 A CN201410247119 A CN 201410247119A CN 103982191 A CN103982191 A CN 103982191A
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Abstract
The invention belongs to the technical field of tunnel engineering and underground engineering, and provides a method which is effectively used for construction of intensively-weathered and fully-weathered expansive rock and soil with high expandability and sand gravel loose soil field shallow-buried or ultra-shallow-buried large-section and extra-large-section tunnels with poor self-stability. According to the method, the supporting effect of a soil arch is taken into consideration, the soil arch is formed in surrounding rock in the tunnel excavation process, the anti-arch supporting effect of a temporary support and a permanent support is utilized, the large-section excavation is converted into the small-section multi-step excavation, and therefore excavation of the whole large-section tunnel is completed. The effective method for simplifying and facilitating engineering application is given, the up-down-asynchronous and left-right-synchronous excavation method can be adopted through tunnel reserved soil columns, the potential safety hazards of construction of the shallow-buried or ultra-shallow-buried large-section and extra-large-section tunnels are eliminated, and unnecessary economic waste is avoided.
Description
Technical field
The present invention relates to construction of tunnel field, subway engineering field, is a kind of construction that is effective to the loose soil site shallow embedding of the poor sand gravel of severely-weathered expansive rock, completely decomposed expansive rock, expansive soil and autostability that dilatancy is larger or the large section of super shallow embedding, extra-large cross-section tunnel excavation.
Technical background
Now, along with countries in the world high-speed railway, personal rapid transit special line, heavy haul railway, speedway, the great infrastructure construction such as city underground is fast-developing, get more and more and run into the severely-weathered expansive rock that dilatancy is larger, completely decomposed expansive rock, the loose soil site condition of sand gravel that expansive soil and autostability are poor, and carry out shallow embedding or the large section of super shallow embedding at this complex site, the artificial tunneling construction in extra-large cross-section tunnel, prop up gear difficulty large, problem is many, particularly often occur that a gear destroys, the serious problems such as inefficacy, causing that country rock frequently occurs extrudes, arch upward, landslide, the phenomenons such as roof fall, not only significantly affect construction speed, the extra engineering cost that increases, but also may bring out safe construction.In recent years, in the tunnel constructions such as China Express Railway, personal rapid transit special line, city underground, often there is above-mentioned engineering problem or accident, cause a series of larger life, production, property loss and existing building to destroy.Yet, lack reliable technological means both at home and abroad always, effectively solve the engineering roadblock of shallow embedding under above complex site condition or the large section of super shallow embedding, the artificial tunneling construction in extra-large cross-section tunnel.
Summary of the invention
A kind of reserved earth pillar that the present invention has provided shallow embedding or the large section of super shallow embedding, the artificial tunneling construction in extra-large cross-section tunnel is the synchronous digging construction method in substep left and right up and down.For the loose native complex site condition of the poor sand gravel of the larger severely-weathered expansive rock of dilatancy, completely decomposed expansive rock, expansive soil and autostability, consider the formation condition of soil arch, utilize the buttressing effect of soil arch, by becoming large cross section excavation, be light section step excavation, in excavation construction, country rock forms soil arch.And then, utilize the antiarch supporting role of temporary supporting and permanent support, avoid excavating top landslide, sidewall and bottom expansion and extrude.By becoming large span construction, into little span, construct, by little span is used continuously, be finally extended to large span.
The inventive method comprises three aspects: content, as follows:
(1) according to site condition, country rock performance, edpth of tunnel and tunnel cross-section etc., with country rock in excavation construction, can form nature soil arch is as the criterion, and meet the basic demand of < < railway tunnel work construction safety tecnical regulations > > (TB10304-2009), calculate the width of minimum reserved earth pillar top, middle part, bottom, see Fig. 1.
(2) 1., 3. working procedure shown in Fig. 1 forms shown in 1. reserved annular soil nuclear cross section be shown in Fig. 2, the benchmark of the enough safe support excavation face extrusion deformations of the native nuclear energy of take as calculating, meet the basic demand of < < railway tunnel work construction safety tecnical regulations > > (TB10304-2009), in being excavated, the minimum cross section of native core is long-pending simultaneously.
(3) for each excavating sequences, see in Fig. 1 that operation 1., 3., 6., 8., to guarantee that surrouding rock deformation is no more than allowable strain within the interval time of excavation and a gear, be as the criterion, allowable strain is directly determined by < < railway tunnel work construction safety tecnical regulations > > (TB10304-2009), calculates along tunnel the axially longest distance of driving.
(4) carry out the construction of i iron permanent support, i iron temporary supporting, meet the basic demand of < < railway tunnel work construction safety tecnical regulations > > (TB10304-2009), and then according to the operation shown in circle numeral in Fig. 1, carry out artificial tunneling and a gear construction, wherein operation 1., 3. foundation figure (2) adopts reserved earth pillar Ring Cutting engineering method to carry out excavation construction.
(5) in excavation construction whole process, requirement according to < < railway tunnel work construction safety tecnical regulations > > (TB10304-2009), key position is done to construction monitoring, Contents for Monitoring comprises stress, distortion, the displacement of distortion, soil pressure and the retaining structure of country rock, guarantees safe smooth construction.
The present invention has following beneficial effect:
For the loose native complex site condition of the poor sand gravel of the larger severely-weathered expansive rock of dilatancy, completely decomposed expansive rock, expansive soil and autostability, in order to guarantee the safe smooth construction of shallow embedding or the large section of super shallow embedding, the artificial tunneling in extra-large cross-section tunnel, utilize the temporary supporting effect of reserved earth pillar, avoid excavating top landslide, simultaneously, the antiarch supporting role of application temporary supporting and permanent support, avoids excavating top landslide, sidewall and bottom expansion and extrudes.In addition, become large span construction into little span construction, by little span is used continuously, be finally extended to whole span constructing tunnel.A kind of reserved earth pillar that is effective to shallow embedding or the large section of super shallow embedding, extra-large cross-section tunnel proposing is the synchronous digging construction method in substep left and right up and down, effectively instruct constructing tunnel design under complex site condition, and carry out engineering method optimization and constructure scheme and rationally determine, guarantee reserved earth pillar science and the reasonability of the synchronous digging construction method in substep left and right up and down.
Accompanying drawing explanation
Fig. 1 is the reserved earth pillar that relates in the present invention design type and the construction process of the synchronous digging construction method in substep left and right up and down.
Fig. 2 is the reserved native nuclear ring shape excavation method relating in the present invention.
The specific embodiment
Invention gives the reserved earth pillar in the tunnel implementation step of the synchronous excavation method in substep left and right up and down, as follows.
(1), according to site condition, country rock performance, edpth of tunnel, tunnel cross-section etc., obtain top, the middle part of reserved earth pillar, the minimum widith of bottom.
(2) minimum cross section of determining reserved annular native core is amassed.
(3) calculate along tunnel the axially maximum length of driving.
(4) carry out i iron permanent support, i iron temporary supporting checking of bearing capacity and design.
(5), according to Fig. 1 operation, reserve earth pillar loop tunnel excavation construction.
Claims (3)
1. a reserved earth pillar synchronous digging construction method in substep left and right up and down, consider the formation condition of soil arch, the bearing capacity (buttressing effect) that utilizes soil arch, is characterized in that: first calculate basal area, each excavating sequences axially length of driving, i iron permanent support and i iron temporary supporting require along tunnel size and the bearing capacity of reserving native core in the width of each portion of earth pillar, reserved native nuclear ring shape digging construction method; Then carry out artificial tunneling and a gear construction, both sides adopt " reserved earth pillar Ring Cutting engineering method " to carry out excavation construction; Excavation construction whole process is done construction monitoring to key position.
2. the reserved earth pillar according to claim 1 synchronous digging construction method in about substep up and down, is characterized in that take in excavation construction that it is the benchmark calculating that country rock can form nature soil arch, calculates top, the middle part of reserved earth pillar, the width of bottom.
3. the reserved earth pillar according to claim 1 synchronous digging construction method in about substep up and down, is characterized in that take that the enough safe support excavation face extrusion deformations of native nuclear energy are the benchmark calculating, and calculates the basal area of native core in reserved native nuclear ring shape digging construction method; Take and guarantee that in the interval time between excavation and a gear, the benchmark of excessive extrusion deformation as calculating do not occur country rock, determine the length of each excavating sequences axial driving along tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410247119.9A CN103982191A (en) | 2014-06-05 | 2014-06-05 | Reserved soil column up-down-asynchronous and left-right-synchronous excavation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410247119.9A CN103982191A (en) | 2014-06-05 | 2014-06-05 | Reserved soil column up-down-asynchronous and left-right-synchronous excavation method |
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| CN103982191A true CN103982191A (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410247119.9A Pending CN103982191A (en) | 2014-06-05 | 2014-06-05 | Reserved soil column up-down-asynchronous and left-right-synchronous excavation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154326A (en) * | 2014-08-14 | 2014-11-19 | 中石化第十建设有限公司 | Rigid sleeve head for desert and silt geology jacking pipe and jacking pipe construction method thereof |
| CN106988757A (en) * | 2017-04-14 | 2017-07-28 | 中铁四局集团有限公司 | The double -side approach construction technology of reserved rock pillar and hanging by bolt combination |
| CN107130967A (en) * | 2017-06-08 | 2017-09-05 | 重庆工程职业技术学院 | The construction method of extra-large cross-section deep tunnel and accessory structure |
-
2014
- 2014-06-05 CN CN201410247119.9A patent/CN103982191A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154326A (en) * | 2014-08-14 | 2014-11-19 | 中石化第十建设有限公司 | Rigid sleeve head for desert and silt geology jacking pipe and jacking pipe construction method thereof |
| CN106988757A (en) * | 2017-04-14 | 2017-07-28 | 中铁四局集团有限公司 | The double -side approach construction technology of reserved rock pillar and hanging by bolt combination |
| CN107130967A (en) * | 2017-06-08 | 2017-09-05 | 重庆工程职业技术学院 | The construction method of extra-large cross-section deep tunnel and accessory structure |
| CN107130967B (en) * | 2017-06-08 | 2019-01-01 | 重庆工程职业技术学院 | The construction method of extra-large cross-section deep tunnel and accessory structure |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140813 |
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| WD01 | Invention patent application deemed withdrawn after publication |