CN110174503A - A method of determining that country rock weakens development range based on tunnel deformation - Google Patents
A method of determining that country rock weakens development range based on tunnel deformation Download PDFInfo
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- CN110174503A CN110174503A CN201910382854.3A CN201910382854A CN110174503A CN 110174503 A CN110174503 A CN 110174503A CN 201910382854 A CN201910382854 A CN 201910382854A CN 110174503 A CN110174503 A CN 110174503A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention relates to a kind of methods for determining country rock reduction development range based on tunnel deformation, comprising: step S1: acquisition tunnel-liner data Lj；Step S2: the tunnel-liner data L under different surrounding rock pressure is calculated with load structure methods；Step S3: the tunnel-liner data L with acquisition is establishedjWith the tunnel-liner data L calculated with load structure methodsWhen related objective function S, objective function S meet setting condition, the pressure from surrounding rock P of record load structure method application；Step S4: loosening area of surrounding rocks h is calculated according to the pressure from surrounding rock Pj；Step S5: the loosening area of surrounding rocks h under design pressure from surrounding rock is calculateds；Step S6: the loosening area of surrounding rocks h calculated according to pressure from surrounding rock PjWith the loosening area of surrounding rocks h under design pressure from surrounding rocksObtain country rock reduction development range hr.Compared with prior art, the present invention has the advantages that quick, lossless, with high accuracy that the implementation cost is low, can be widely applied in the other similar underground engineering such as piping lane pipe trench, pipe jacking tunnel.
Description
Technical field
The present invention relates to tunnel safety technical fields, determine country rock reduction development based on tunnel deformation more particularly, to a kind of
The method of range.
Background technique
During tunnel operation, influence the effects of due to high-ground stress, underground heat, underground water changes coffer mechanics spy
Property, country rock is weakened, country rock load-carrying properties are reduced, has broken the metastable state of original country rock-lining cutting, threatens tunnel
Structure safety.Range and degree are weakened to verify country rock, generallys use drill hole sampling, the method for carrying out laboratory test, but it is this
Method has the following deficiencies:
(1) since drilling hole amount is limited, range is weakened generally according to the non-boring sites in curing country rock of boring test resulting estimate, it is difficult
Accurately to obtain tunnel surrounding reduction range.
(2) drilling is bored sample departing from original environmental effect, and test result can not accurately reflect rock mass mechanics spy
Property.
(3) this method whole flow process time is longer, easily misses the best opportunity of Tunnel Repair reinforcing.
(4) it is also a kind of destruction to lining cutting self structure in the drilling of existing liner structure, reduces liner structure load
Energy.
Therefore, range and trend that quick, the lossless method of one kind determines country rock reduction development are needed.
It is determining that Chinese invention patent CN108278109A specification discloses a kind of underground engineering reduction surrounding rock consolidation opportunity
Method, comprising: scene obtains under different periods, the Surrounding Rock Strength of different depth at the setting observation area for excavating body, and counts
Calculate the country rock mean intensity of different periods；The corresponding relationship that fitting country rock mean intensity changes over time；According to the corresponding pass
System calculates when country rock mean intensity reduction to time corresponding when setting intensity.This method further include: scene, which obtains, excavates body
In the initial Surrounding Rock Strength for setting different depth when not weakening at observation area, initial country rock is calculated by initial Surrounding Rock Strength
Mean intensity, the corresponding relationship are fitted using the initial country rock mean intensity as the data of initial time.It obtains at scene
It takes away and digs body Surrounding Rock Strength includes: in the observation after the initial Surrounding Rock Strength of different depth and/or reduction at the observation area
It drills at region, reflects the drilling parameter of Surrounding Rock Strength in drilling process by obtaining drilling machine, obtain at different depth
Corresponding Surrounding Rock Strength.The invention is got parms by the drilling process of drilling machine, destroys self structure.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind to be based on tunnel deformation
The method for determining country rock reduction development range.
The purpose of the present invention can be achieved through the following technical solutions:
A method of determining that country rock weakens development range based on tunnel deformation, comprising the following steps:
Step S1: acquisition tunnel-liner data Lj；
Step S2: the tunnel-liner data L under different surrounding rock pressure is calculated with load structure methods；
Step S3: the tunnel-liner data L with acquisition is establishedjWith the tunnel-liner data L calculated with load structure methods
When related objective function S, objective function S meet setting condition, the pressure from surrounding rock P of record load structure method application；
Step S4: loosening area of surrounding rocks h is calculated according to the pressure from surrounding rock Pj；
Step S5: the loosening area of surrounding rocks h under design pressure from surrounding rock is calculateds；
Step S6: the loosening area of surrounding rocks h calculated according to pressure from surrounding rock PjWith the wall rock loosening model under design pressure from surrounding rock
Enclose hsObtain country rock reduction development range hr。
The tunnel-liner data include Vault settlement aggregate-value and clearance convergence aggregate-value.
The step S3 objective function S are as follows:
The setting condition is objective function S less than 10%.
In the step S4, loosening area of surrounding rocks hjAre as follows:
Wherein, γ is country rock severe.
In the step S4, loosening area of surrounding rocks h is calculated according to pressure from surrounding rock PjWhen, setting vault calculates measuring point, the
One haunch calculates measuring point, the first abutment wall calculates measuring point, the first arch springing calculates measuring point, the second haunch calculates measuring point, the second abutment wall meter
Calculate measuring point, the second arch springing calculates measuring point and arch bottom calculates measuring point.
In the step S5, loosening area of surrounding rocks hsAre as follows:
Wherein, a be tunnel hair hole half across, h is tunnel hair height of holes,For country rock internal friction angle, f is the firm system of country rock
Number.
In the step S6, country rock weakens development range hrAre as follows:
hr=hj-hs。
Compared with prior art, the invention has the following advantages that
(1) without drilling, loosening area of surrounding rocks h is calculated according to pressure from surrounding rock PjWhen, setting vault calculates measuring point, the first arch
Waist calculates measuring point, the first abutment wall calculates measuring point, the first arch springing calculates measuring point, the second haunch calculates measuring point, the second abutment wall is calculated and surveyed
Point, the second arch springing calculate measuring point and arch bottom calculates measuring point, can obtain each position tunnel surrounding reduction range.
(2) implementation process can react rock mass mechanics characteristic without departing from site environment, calculated result well.
(3) it is fast to implement speed, the best opportunity of Tunnel Repair reinforcing can be controlled.
(4) protect existing lining cutting without damage.
(5) the implementation cost is low, can be widely applied to underground engineering.
(6) measurement Vault settlement aggregate-value and clearance convergence aggregate-value are only needed, method is simple, facilitates implementation.
(7) setting condition of objective function S is adjustable, can meet the requirement of different accuracy.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is lining cutting point position schematic diagram；
Fig. 3 is to calculate loosening area of surrounding rocks hjWhen calculating measuring point；
Fig. 4 is that country rock weakens development range schematic diagram；
Appended drawing reference:
1 is Vault settlement measuring point；2 be the first perimeter convergence measuring point；3 be the second perimeter convergence measuring point；4 calculate survey for vault
Point；5 calculate measuring point for the first haunch；6 calculate measuring point for the first abutment wall；7 calculate measuring point for the first arch springing；8 calculate survey for arch bottom
Point；9 calculate measuring point for the second arch springing；10 calculate measuring point for the second abutment wall；11 calculate measuring point for the second haunch.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment
A method of determining that country rock weakens development range based on tunnel deformation, method includes the following steps:
Step S1: acquisition tunnel-liner data Lj；
Step S2: the tunnel-liner data L under different surrounding rock pressure is calculated with load structure methods；
Step S3: the tunnel-liner data L with acquisition is establishedjWith the tunnel-liner data L calculated with load structure methods
When related objective function S, objective function S meet setting condition, the pressure from surrounding rock P of record load structure method application；
Step S4: loosening area of surrounding rocks h is calculated according to the pressure from surrounding rock Pj；
Step S5: the loosening area of surrounding rocks h under design pressure from surrounding rock is calculateds；
Step S6: the loosening area of surrounding rocks h calculated according to pressure from surrounding rock PjWith the wall rock loosening model under design pressure from surrounding rock
Enclose hsObtain country rock reduction development range hr。
Tunnel-liner data include Vault settlement aggregate-value and clearance convergence aggregate-value.
Step S3 objective function S are as follows:
Objective function S should be less than 10%, and Vault settlement aggregate-value and clearance convergence aggregate-value should meet the target letter simultaneously
Said conditions.
Step S4 is according to loose load theoretical calculation loosening area of surrounding rocks hjAre as follows:
Wherein, γ is country rock severe, which can calculate loosening area of surrounding rocks at tunnel different parts.
Step S4 calculates loosening area of surrounding rocks h according to pressure from surrounding rock PjWhen, setting vault calculates measuring point 4, the first haunch meter
Calculate measuring point 5, the first abutment wall calculates measuring point 6, the first arch springing calculates measuring point 7, the second haunch calculates measuring point 11, the second abutment wall is calculated and surveyed
The 10, second arch springing of point calculates measuring point 9 and arch bottom calculates measuring point 8, applies pressure from surrounding rock, can by each frequency for increasing 0.5kPa by
Grade applies pressure from surrounding rock.
Step S5 loosening area of surrounding rocks hsAre as follows:
Wherein, a be tunnel hair hole half across, h is tunnel hair height of holes,For country rock internal friction angle, f is the firm system of country rock
Number.
Step S6 country rock weakens development range hrAre as follows:
hr=hj-hs
The present invention has the advantages that quick, lossless, with high accuracy, and the implementation cost is low, can be widely applied to piping lane pipe trench, top
In the other similar underground engineering such as pipe tunnel.
Fig. 1 illustrates the process that country rock reduction development is determined according to Tunnel Lining Deformation.
Fig. 2 is tunnel-liner point position schematic diagram.Each monitoring section arranges that three measuring points, respectively Vault settlement are surveyed
The 1, first perimeter convergence measuring point 2 of point and the second perimeter convergence measuring point 3；First perimeter convergence measuring point 2 and the second perimeter convergence measuring point 3
Between horizontal distance L23Changing value be tunnel clearance convergence, 2 to the second perimeter convergence measuring point of the first perimeter convergence of measuring point measuring point
3, the vertical range L of 1 line of Vault settlement measuring point1Changing value be tunnel vault sedimentation.
Fig. 3 is to calculate loosening area of surrounding rocks hjWhen calculating measuring point；Loosening area of surrounding rocks h is calculated according to pressure from surrounding rock PjWhen,
Tunnel different parts can be chosen according to required precision and calculate measuring point, but should include that vault calculates measuring point 4, the first haunch is calculated and surveyed
The 5, first abutment wall of point calculates measuring point 6, the first arch springing calculates measuring point 7, the second haunch calculates measuring point 11, the second abutment wall calculates measuring point
10, the second arch springing calculates measuring point 9 and arch bottom calculates measuring point 8.
Fig. 4 is that country rock weakens development range schematic diagram；Loosening area of surrounding rocks hjWith loosening area of surrounding rocks hsBetween be country rock
Weaken development range hr。
Claims (8)
1. a kind of method for determining country rock reduction development range based on tunnel deformation, which is characterized in that this method includes following step
It is rapid:
Step S1: acquisition tunnel-liner data Lj；
Step S2: the tunnel-liner data L under different surrounding rock pressure is calculated with load structure methods；
Step S3: the tunnel-liner data L with acquisition is establishedjWith the tunnel-liner data L calculated with load structure methodsIt is related
Objective function S, objective function S meet impose a condition when, record load structure method apply pressure from surrounding rock P；
Step S4: loosening area of surrounding rocks h is calculated according to the pressure from surrounding rock Pj；
Step S5: the loosening area of surrounding rocks h under design pressure from surrounding rock is calculateds；
Step S6: the loosening area of surrounding rocks h calculated according to pressure from surrounding rock PjWith the loosening area of surrounding rocks h under design pressure from surrounding rocks?
Development range h is weakened to country rockr。
2. a kind of method for determining country rock reduction development range based on tunnel deformation according to claim 1, feature exist
In the tunnel-liner data include Vault settlement aggregate-value and clearance convergence aggregate-value.
3. a kind of method for determining country rock reduction development range based on tunnel deformation according to claim 1, feature exist
In the step S3 objective function S are as follows:
4. a kind of method for determining country rock reduction development range based on tunnel deformation according to claim 3, feature exist
In the setting condition is objective function S less than 10%.
5. a kind of method for determining country rock reduction development range based on tunnel deformation according to claim 1, feature exist
In the step S4 loosening area of surrounding rocks hjAre as follows:
Wherein, γ is country rock severe.
6. a kind of method for determining country rock reduction development range based on tunnel deformation according to claim 1, feature exist
In in the step S4, according to pressure from surrounding rock P calculating loosening area of surrounding rocks hjWhen, setting vault calculates measuring point, the first haunch
Calculating measuring point, the first abutment wall calculate measuring point, the first arch springing calculates measuring point, the second haunch calculates measuring point, the second abutment wall calculates measuring point,
Second arch springing calculates measuring point and arch bottom calculates measuring point.
7. a kind of method for determining country rock reduction development range based on tunnel deformation according to claim 1, feature exist
In, in the step S5, loosening area of surrounding rocks hsAre as follows:
Wherein, a be tunnel hair hole half across, h is tunnel hair height of holes,For country rock internal friction angle, f is country rock firmness coefficient.
8. a kind of method for determining country rock reduction development range based on tunnel deformation according to claim 1, feature exist
In in the step S6, country rock weakens development range hrAre as follows:
hr=hj-hs。
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Cited By (3)
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| CN111596375A (en) * | 2020-04-23 | 2020-08-28 | 上海同岩土木工程科技股份有限公司 | Method and device for detecting occurrence state of underground water behind lining |
| CN112924059A (en) * | 2021-01-26 | 2021-06-08 | 上海同岩土木工程科技股份有限公司 | Strip-type surrounding rock pressure monitoring device, monitoring method and installation method |
| CN115859444A (en) * | 2022-12-21 | 2023-03-28 | 交通运输部公路科学研究所 | Method for predicting road tunnel collapse |
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| CN112924059A (en) * | 2021-01-26 | 2021-06-08 | 上海同岩土木工程科技股份有限公司 | Strip-type surrounding rock pressure monitoring device, monitoring method and installation method |
| CN112924059B (en) * | 2021-01-26 | 2022-09-23 | 上海同岩土木工程科技股份有限公司 | Strip-type surrounding rock pressure monitoring device, monitoring method and installation method |
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