CN104895575A - High-efficiency rapid construction method for upper-soft lower-hard formation large-section tunnels - Google Patents

High-efficiency rapid construction method for upper-soft lower-hard formation large-section tunnels Download PDF

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Publication number
CN104895575A
CN104895575A CN201510298845.8A CN201510298845A CN104895575A CN 104895575 A CN104895575 A CN 104895575A CN 201510298845 A CN201510298845 A CN 201510298845A CN 104895575 A CN104895575 A CN 104895575A
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construction
tunnel
soft
board
bar
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CN201510298845.8A
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Chinese (zh)
Inventor
吴波
黄惟
臧万军
李静
王广地
黄建华
张丙强
赵振伟
勒宗振
王启云
赵文娟
何梦超
王鸣涛
杨枫
林上顺
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福建工程学院
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Abstract

The invention discloses a high-efficiency rapid construction method for upper-soft lower-hard formation large-section tunnels. The method includes the steps: 1) construction preparation; 2) advance geological forecast; 3) construction method judgment and selection, namely subjecting a current tunnel section to surrounding rock hardness stratification analysis on the basis of geological forecast results obtained at the step 2), and selecting a construction method for the present stage according to analysis results; step 4) step-by-step rapid excavation, namely selectively arranging inverted arches or partition walls for the tunnel section according to the selected construction method, and rapidly excavating segmented units of the inverted arches or the partition walls; step 5) starting of a next construction section, and repeating the step 3); step 6) completion of tunnel excavation. The high-efficiency rapid construction method is adaptive to various complicated geological conditions and environment conditions; especially in upper-soft lower-hard formations, flexibility in method change and adaptability of the construction method to formation changes can be better reflected, construction procedures are optimized to the maximum extent, construction safety is guaranteed, and construction progress is accelerated.

Description

The efficient rapid constructing method of upper-soft lower-hard ground large cross-section tunnel

Technical field

The present invention relates to one to may be used for, in the engineerings such as highway, railway and subway, passing through the efficient rapid constructing method of upper-soft lower-hard ground large cross-section tunnel.

Background technology

Existing large cross-section tunnel excavation technology mainly comprises CD method, CRD method and two side-wall pilot tunnel.CD method is construction of central division wall method, is not suitable for complex geologic conditions, the engineering that Land-Subsidence Control is strict.CRD method is for intersecting bent wall middle-wall method, and the method controlling distortion ability is strong, can be used for constructing tunnel under complex geological condition, but has that temporary lining is many, operation is loaded down with trivial details, engineering method conversion difficulty, working space are narrow and small, the shortcomings such as speed of application is slow, and construction cost is high.Two side-wall pilot tunnel is also known as twin side heading method or glasses working, and its partition wall also adopts bent wall, also there is the shortcomings such as difficulty of construction is large, speed of application slow, engineering method conversion difficulty.

Summary of the invention

The present invention be directed to existing large cross-section tunnel adopts CD method, CRD method or two side-wall pilot tunnel to exist weak point when passing through upper-soft lower-hard ground, propose a kind of efficiency high, stablize, the efficient rapid constructing method of adaptable upper-soft lower-hard ground large cross-section tunnel, to improve safety for tunnel engineering, economy and flexibility.

For reaching above-mentioned technique effect, technical scheme of the present invention is:

The efficient rapid constructing method of a kind of upper-soft lower-hard ground large cross-section tunnel, comprises the steps:

Step 1) preparation of construction;

Step 2) advance geologic prediction;

Step 3) construction judge and select, based on step 2) geologic prediction result, country rock soft or hard chromatographic analysis is carried out to the tunnel cross-section of present segment, present stage construction is selected according to analysis result, construction comprises: be divided into by tunnel cross-section and top bar, middle step and getting out of a predicament or an embarrassing situation, in three steps, have respectively: do not establish Temporary invert, top bar and establish Temporary invert, top bar, middle step and get out of a predicament or an embarrassing situation and establish Temporary invert, do not establish mid-board, top bar and establish mid-board, top bar, mid-board established by middle step, top bar, middle step and get out of a predicament or an embarrassing situation and establish mid-board, individually or be combined to form selective construction, wherein, mid-board is stalk formula mid-board.

Step 4) distribution Rapid Excavation, based on step 3) construction selected, select to arrange inverted arch or partition wall to tunnel cross-section, Rapid Excavation is carried out to the unit after inverted arch or partition wall segmentation; Leading pre-supporting is applied to current excavation section tunnel cross-section.Also comprise preliminary bracing step and temporary lining step.Also comprise secondary lining step.Branch's Rapid Excavation is according to stratum soft or hard situation, section is divided into three main steps, again each step is divided into two parts in left and right, altogether form six unit, horizontal and vertically between six unit be combined to form partial excavation, after excavation, lining cutting and inverted arch are closelyed follow, and adopt stalk formula mid-board, guarantee that tunnel vertical bearing capacity is large, resistance capacity to deformation strong, the mid-board of Temporary invert and each step suitably can be set up according to field geology situation.

Step 5) enter next construction section, repeat step 3), based on the construction chosen, by increasing this construction section or reducing inverted arch or partition wall, current tunnel section is split again, realize the rapid translating of different surrounding rock rank location and engineering method;

Step 6) complete tunnel excavation.

Advantage of the present invention:

1, strong adaptability.Can adapt to various complex geological condition and ambient conditions, particularly in upper-soft lower-hard ground, more can embody the compliance of this engineering method formation change and the flexibility of engineering method conversion, optimized construction procedure to greatest extent, ensures construction safety, accelerating construction progress.

2, safety is high.The bent median septum wall of traditional CD method or CRD method is modified into perpendicular mid-board, the effect of mid-board cross-cut and control tunnel deformation can be played better.When upper-soft lower-hard ground, shallow embedding or surface settlement control require strict, the good feature of this engineering method working security more can be embodied.

3, flexibility is good.Owing to have employed vertical mid-board, be convenient to adopt shaped steel erection, advanced order and the distance of left and right cavern can be arranged according to actual needs flexibly, can also on mid-board reserving hole, be convenient to left and right cavern equipment fall to use, reduce temporary lining and increase inter-visibility, be more convenient to monitoring measurement.

4, work efficiency is high.This engineering method bases oneself upon benching tunnelling method, therefore, it is possible to play the advantage of benching tunnelling method efficiency utilization plant equipment, can embody the fast advantage of speed of application when the duration is nervous.

5, cost is low.This engineering method has good transitionality for during the formation variation of front and back, reduces the triviality that personnel, machinery and construction method adjust, and farthest optimizes temporary lining and arranges, significantly reduce construction cost.

Accompanying drawing explanation

Fig. 1 is construction process entire block diagram of the present invention;

Fig. 2 is that in Fig. 1, engineering method selects transition diagram;

Fig. 3 is engineering method c3 construction sectional schematic diagram in Fig. 2;

Fig. 4 is engineering method c3 construction generalized section in Fig. 2;

Number in the figure: the radial anchor pole of 1-system; 2-Temporary invert; The interim mid-board of 3-; 4-secondary lining; 5-preliminary bracing; 6-waterproofing course; 7-lock foot anchoring stock; 8-arch advance support; 9-just props up steelframe; The longitudinal connecting reinforcement of 10-; 1.-left part country rock of topping bar; 2.-right part country rock of topping bar; 3.-middle step left part country rock; 4.-middle step right part country rock; 5.-country rock of getting out of a predicament or an embarrassing situation; 6. fill at the bottom of-tunnel; 7.-inverted arch two serves as a contrast.

Detailed description of the invention

Go out as shown in Figure 1, the efficient rapid constructing method of a kind of upper-soft lower-hard ground large cross-section tunnel of the present invention, comprises the steps:

Step 1) preparation of construction;

Step 2) advance geologic prediction;

Step 3) construction judge and select, based on step 2) geologic prediction result, country rock soft or hard chromatographic analysis is carried out to the tunnel cross-section of present segment, present stage construction is selected according to analysis result, construction comprises: construction realizes as follows: be first divided into by tunnel cross-section and top bar, middle step and getting out of a predicament or an embarrassing situation, in three steps, have respectively: do not establish Temporary invert, top bar and establish Temporary invert, top bar and middle step and get out of a predicament or an embarrassing situation and establish Temporary invert, also have in addition: do not establish mid-board, top bar and establish mid-board, top bar and middle step establish mid-board, top bar and middle step and get out of a predicament or an embarrassing situation and establish mid-board, individually or be combined to form 12 kinds of selective constructions, wherein, mid-board is stalk formula mid-board.

Go out as shown in Figure 2, the efficient rapid constructing method of upper-soft lower-hard ground large cross-section tunnel can develop out 12 kinds of engineering methods flexibly, to adapt to the upper-soft lower-hard ground construction of tunnel of different stage country rock combination on cross section.

When whole tunnel excavation section is all in the middle of good rock stratum, as engineering method a1 (not establishing temporary lining), can adopt three benching tunnelling method constructions, the interim mid-board of upper, middle and lower, tunnel step and the Temporary invert of upper and lower step all can not apply.

Top bar when tunnel and be in the rock stratum of poor weakness, and in, get out of a predicament or an embarrassing situation when being in better partially hard rock stratum, as engineering method a2 (top bar and establish interim straight mid-board), engineering method a3 (on, interim straight mid-board established by middle step), engineering method a4 (on, in, get out of a predicament or an embarrassing situation and establish interim straight mid-board), top bar in digging process and arrange interim vertically mid-board in tunnel, the base pressure of both sides arch springing has been shared in the existence of mid-board on the one hand, also effectively ground settlement can be controlled on the other hand, when the supporting capacity of ground of appearing on the stage can not be satisfied the demand or arch springing horizontal convergence is excessive, also need to arrange Temporary invert and tighten and improve topping bar.In, get out of a predicament or an embarrassing situation excavation time can not apply mid-board and Temporary invert.

When on tunnel, middle step is in the rock stratum of poor weakness, and get out of a predicament or an embarrassing situation when being in better partially hard rock stratum, as engineering method b1 (top bar and establish Temporary invert), engineering method b2 (top bar and establish Temporary invert and interim straight mid-board), engineering method b3 (tops bar and establishes Temporary invert, on, interim straight mid-board established by middle step), engineering method b4 (tops bar and establishes Temporary invert, on, in, get out of a predicament or an embarrassing situation and establish interim straight mid-board), top bar and all arrange interim mid-board in middle bench excavation work progress in tunnel, and Temporary invert is set topping bar, also need when the supporting capacity of central step ground can not be satisfied the demand or arch springing horizontal convergence is larger that Temporary invert is set at middle and carry out reinforcement improvement, get out of a predicament or an embarrassing situation when excavating and can not apply mid-board.

When whole tunnel excavation face is in the country rock of poor weakness, in each bench excavation process, interim mid-board is all set, as engineering method c4, (Temporary invert established by upper, middle step, interim straight mid-board established by upper, middle and lower step), when the supporting capacity of ground can not satisfy the demand or the horizontal convergence of arch springing time, also needing, Temporary invert is set and tighten and improve.When tunnel surrounding is in poor weak surrounding rock, but when considering construction speed, working space, while inverted arch is set, median septum is set according to actual needs, as engineering method c1 (Temporary invert established by upper, middle step), (Temporary invert established by upper, middle step to engineering method c2, top bar and establish interim straight mid-board), engineering method c3 (Temporary invert established by upper, middle step, and interim straight mid-board established by upper, middle step).

Step 4) distribution Rapid Excavation, based on step 3) construction selected, select to arrange inverted arch or partition wall to tunnel cross-section, Rapid Excavation is carried out to the unit after inverted arch or partition wall segmentation; Leading pre-supporting is applied to current excavation section tunnel cross-section.Also comprise preliminary bracing step and temporary lining step.Also comprise secondary lining step.Branch's Rapid Excavation is according to stratum soft or hard situation, section is divided into three main steps, again each step is divided into two parts in left and right, altogether form six unit, horizontal and vertically between six unit be combined to form partial excavation, after excavation, lining cutting and inverted arch are closelyed follow, and adopt stalk formula mid-board, guarantee that tunnel vertical bearing capacity is large, resistance capacity to deformation strong, the mid-board of Temporary invert and each step suitably can be set up according to field geology situation.

Step 5) enter next construction section, repeat step 3), based on the construction chosen, by increasing this construction section or reducing inverted arch or partition wall, unit is repartitioned to current tunnel section, realize the rapid translating of different surrounding rock rank location and engineering method;

Step 6) complete tunnel excavation.

Below with accompanying drawing 3 and Fig. 4 for tunnel top bar and middle step for weak surrounding rock, and country rock of getting out of a predicament or an embarrassing situation better partially hard time, employing engineering method c3 is example, specifically describe and adopt the efficient rapid constructing method of upper-soft lower-hard ground large cross-section tunnel to carry out the step excavated, tunnel top bar and middle step interim mid-board is set, with mid-board 3 will top bar and middle step be divided into four parts, Specific construction operation is:

Operation 1: utilize the vertical steelframe of a upper construction section circulation frame to apply arch advance support 8.

Operation 2: excavate 1. portion of appearing on the stage, the just thick concrete of spray 4cm, frame is vertical just props up steelframe 9 and the interim steelframe (not shown in Fig. 4) of mid-board 3, and arranges two locks pin anchor tube 7 (Φ 42, L=3.5m), lock pin anchor tube and steelframe firm welding.Each Pin steelframe adopts longitudinal connecting reinforcement 10 to connect.Answer pneumatically placed concrete after being drilled with radial anchor pole 1 to design thickness, bottom steel frame is set up after first pneumatically placed concrete, sprays 20cm concrete enclosing again after erection.

Operation 3: excavate 2. portion of appearing on the stage, except the interim steelframe of median septum has been constructed complete, all the other all can carry out see operation 2.If top bar, country rock can not from steady, weak especially again, can 1. portion and 2. portion adopt annular provided core soil method to excavate.

Operation 4: appear on the stage 1., 2. portion's construction is to certain distance, platform 3. portion and 4. portion, in time closed preliminary bracing in excavation successively, can participate in operation 2 and operation 3 is carried out.

Operation 5: when middle platform 3., 4. portion's construction is to suitable distance, excavate 5. portion, just the thick concrete of spray 4cm, frame founds steelframe, is drilled with the rear pneumatically placed concrete again of system anchor bolt 1 to design thickness.

Operation 6: after preliminary bracing 5, waterproofing course 6 and Temporary invert 2 complete, pours into 7. portion's inverted arch two lining and 6. portion's tunnel bottom fill concrete respectively.

Operation 7: preliminary bracing and fill concrete remove mid-board 3 and Temporary invert 2 after reaching intensity, for follow-up excavation and two lining concretings create conditions, forms processing line.

Operation 8: utilize and just build secondary lining 4 (namely arch wall lining cutting once applies) in disposable perfusion Fig. 3 and Fig. 4 of formwork jumbo.

Specification:

The working procedure of other engineering methods, with reference to above-mentioned operation, to be topped bar and the Temporary invert of middle step is arranged depending on country rock situation, as better do not arranged Temporary invert, otherwise arranges; In the mid-board of getting out of a predicament or an embarrassing situation can adopt and the same i iron of topping bar, also can take to retain interval pillar or keep at a certain distance away to establish a steel post.

Working measure:

(1) leading pre-supporting is strengthened

Leading pre-supporting system can from the time, spatially remarkable control effects is played to ground settlement, vault sinking and perimeter convergence, as set up Guan Peng, advanced tubule, advance anchor bolt etc.

(2) preliminary bracing is strengthened

Replacing CRD method and two side-wall pilot tunnel to realize the efficient rapid constructing method of upper-soft lower-hard ground large cross-section tunnel, to reduce tunnel deformation and surface subsidence, ensureing construction safety, needing the theory following " strong supporting ".Strengthen traditional support parameter, two linings are closelyed follow, or suit measures to local conditions to take other measures.

(3) strengthening system controls

The principle that constructing tunnel should be adhered to " weak blast, short drilling depth, strong supporting, early closed, diligent measurement "; The steelframe (or interim steelframe) at process variations place should arrange lock foot anchoring stock, and to guarantee the stable of Foundation of steel frame, between steelframe, longitudinal connecting reinforcement should apply in time and be connected firmly; Strengthen monitoring measurement, carry out construction safety evaluation and early warning, dynamically arrange interim mid-board and Temporary invert.

(4) supporting parameter dynamic optimization

During tunnel excavation, temporary lining and elementary supporting should carry out parameter optimization according to the Real-Time Measuring data, become words, thus reduce waste of material or avoid supporting intensity inadequate with suitable for surrounding rock condition.

The explanation of above example just understands core concept of the present invention for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (5)

1. the efficient rapid constructing method of upper-soft lower-hard ground large cross-section tunnel, is characterized in that, comprise the steps:
Step 1) preparation of construction;
Step 2) advance geologic prediction;
Step 3) construction judge and select, based on step 2) geologic prediction result, country rock soft or hard chromatographic analysis is carried out to the tunnel cross-section of present segment, present stage construction is selected according to analysis result, construction realizes as follows: be first divided into by tunnel cross-section and top bar, middle step and getting out of a predicament or an embarrassing situation, in three steps, have respectively: do not establish Temporary invert, top bar and establish Temporary invert, top bar and middle step and get out of a predicament or an embarrassing situation and establish Temporary invert, also have in addition: do not establish mid-board, top bar and establish mid-board, top bar and middle step establish mid-board, top bar and middle step and get out of a predicament or an embarrassing situation and establish mid-board, individually or be combined to form 12 kinds of selective engineering methods,
Step 4) distribution Rapid Excavation, based on step 3) construction selected, select to arrange inverted arch or partition wall to tunnel cross-section, Rapid Excavation is carried out to the unit after inverted arch or partition wall segmentation;
Step 5) enter next construction section, repeat step 3), based on the construction chosen, by increasing this construction section or reducing inverted arch or partition wall, unit is repartitioned to current tunnel section, realize the rapid translating of different surrounding rock rank location and engineering method;
Step 6) complete tunnel excavation.
2. the efficient rapid constructing method of a kind of upper-soft lower-hard ground large cross-section tunnel according to claim 1, is characterized in that, described step 3) in mid-board be stalk formula.
3. the efficient rapid constructing method of a kind of upper-soft lower-hard ground large cross-section tunnel according to claim 1, is characterized in that, described step 4) in, also comprise and leading pre-supporting is applied to current excavation section tunnel cross-section.
4. the efficient rapid constructing method of a kind of upper-soft lower-hard ground large cross-section tunnel according to claim 1, is characterized in that, described step 4) in, also comprise preliminary bracing step and temporary lining step.
5. the efficient rapid constructing method of a kind of upper-soft lower-hard ground large cross-section tunnel according to claim 1, is characterized in that, described step 4) in, also comprise secondary lining step.
CN201510298845.8A 2015-06-03 2015-06-03 High-efficiency rapid construction method for upper-soft lower-hard formation large-section tunnels CN104895575A (en)

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CN105443132A (en) * 2015-12-02 2016-03-30 中国建筑第五工程局有限公司 Construction method of shallow-buried subsurface-excavated cross-shaped cross-strut tunnel
CN106354972A (en) * 2016-09-18 2017-01-25 重庆大学 Construction technology optimization method for tunnel in nearly horizontal soft and hard interbedded surrounding rock
CN106837371A (en) * 2017-03-23 2017-06-13 中铁五局集团成都工程有限责任公司 The step band inverted arch construction method of large deformation tunnel two
CN107905814A (en) * 2017-10-20 2018-04-13 长安大学 Large span loess tunnel top bar CD construction methods
CN108286920A (en) * 2018-01-31 2018-07-17 中铁二十二局集团第工程有限公司 A kind of implementation of Tunnel Blasting and excavation
CN109882185A (en) * 2019-03-25 2019-06-14 中铁十六局集团第二工程有限公司 The construction method in the soft or hard uneven tunnel of rock matter under a kind of large ground pressure
CN110821502A (en) * 2019-11-29 2020-02-21 中铁隧道局集团有限公司 Novel construction method for entrance section of weak surrounding rock large-span mountain tunnel

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105443132A (en) * 2015-12-02 2016-03-30 中国建筑第五工程局有限公司 Construction method of shallow-buried subsurface-excavated cross-shaped cross-strut tunnel
CN106354972A (en) * 2016-09-18 2017-01-25 重庆大学 Construction technology optimization method for tunnel in nearly horizontal soft and hard interbedded surrounding rock
CN106354972B (en) * 2016-09-18 2019-06-28 重庆大学 Nearly horizontal interbedding of soft and hard rocks surrounding rock tunnel optimization of construction technology method
CN106837371A (en) * 2017-03-23 2017-06-13 中铁五局集团成都工程有限责任公司 The step band inverted arch construction method of large deformation tunnel two
CN107905814A (en) * 2017-10-20 2018-04-13 长安大学 Large span loess tunnel top bar CD construction methods
CN107905814B (en) * 2017-10-20 2019-08-13 长安大学 Large span loess tunnel top bar CD construction method
CN108286920A (en) * 2018-01-31 2018-07-17 中铁二十二局集团第工程有限公司 A kind of implementation of Tunnel Blasting and excavation
CN109882185A (en) * 2019-03-25 2019-06-14 中铁十六局集团第二工程有限公司 The construction method in the soft or hard uneven tunnel of rock matter under a kind of large ground pressure
CN110821502A (en) * 2019-11-29 2020-02-21 中铁隧道局集团有限公司 Novel construction method for entrance section of weak surrounding rock large-span mountain tunnel

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Application publication date: 20150909