CN104806290A - Loess tunnel surrounding rock classification method - Google Patents
Loess tunnel surrounding rock classification method Download PDFInfo
- Publication number
- CN104806290A CN104806290A CN201510145026.XA CN201510145026A CN104806290A CN 104806290 A CN104806290 A CN 104806290A CN 201510145026 A CN201510145026 A CN 201510145026A CN 104806290 A CN104806290 A CN 104806290A
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- loess
- tunnel
- surrounding rock
- division
- classification method
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- 239000011435 rock Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002689 soil Substances 0.000 claims abstract description 14
- 239000004927 clay Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000011161 development Methods 0.000 claims abstract description 5
- 238000009412 basement excavation Methods 0.000 claims abstract description 4
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000013461 design Methods 0.000 description 8
- 238000002791 soaking Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to a loess tunnel surrounding rock classification method. By means of the loess tunnel surrounding rock classification method, loess tunnel preliminary supporting and secondary lining can be performed in targeted mode, construction difficulty can be reduced, and construction safety and tunnel structure stability are ensured. The loess tunnel surrounding rock classification method adopts qualitative characteristic division and qualitative division combination method to perform comprehensive judgment; division is performed according to the indexes including loess formation age, plastic state, joint development degree, surrounding rock stability state after tunnel excavation and the like, and loess tunnel surrounding rock grades are subjected to division according to tunnel soil texture characteristics, underground water and tunnel deep embedding and other factors; loess surrounding rock grade indexes, an obtaining method and the correspondence relation between a loess (clay soil) surrounding rock humidity degree qualitative value and quantity are given.
Description
Technical field
The present invention relates to a kind of classification of tunnel surroun ding rock method, especially relate to
a kind of fender graded method of loess tunnel.
Background technology
In background technology, loess Gu claims " yellow earth ", and originally come from the look in soil, be a kind of quaternary sediment, loess is widely distributed in the world, and the gross area about 1,300 ten thousand square kilometres of whole world loess and Loessial Soil distribution, accounts for 9.3% of the land gross area.China is again that loess distribution area is maximum in the world
country, distribution area reaches 640,000 square kilometres, accounts for me
state of state6.3% of soil area.In middle Yellow River regions, from Helan Mountain, to the east of Taihang Mountain, North gets Great Wall, reaching the Qinling Mountains in the south and almost all covered by loess, area about 270,000 square kilometres, is the main Distribution Area of China's loess.
Loess has following geologic feature: color, based on yellow, isabelline, is lark sometimes; Particle composition is based on powder (0.05 ~ 0.005mm), and content is generally more than 60%, and particle diameter is greater than the less of 0.25mm; Macroscopic large space, larger space, generally at about 1.0mm; Be rich in carbonate, there is diagonal joint, be i.e. tectonic joint, vertical joints development.
The physico-mechanical properties Chang Suiqi diagenetic age of loess, diagenesis regional representation go out certain difference.The dry unit weight of general new deposits is less, and air space ratio is comparatively large, and compressive strain is large, and permeability is strong, and dry state has certain structural strength, structural deterioration after immersion saturated, and cohesion reduces rapidly, and vary within wide limits, present stronger settlement by soaking; The physico-mechanical properties of Late Pleistocene Loess is similar in appearance to new deposits, and their structural strength is all on the low side and variable, and affecting greatly by water is wet, is the main buried layer of collapsible loess; Middle Pleistocene loess is the main body of Loess Layer, and by loess, paleosol layer is alternate with calcareous concretion layer forms, quality denser, unit weight is large, compressibilty and permeability all less, having slight settlement by soaking without under settlement by soaking or high pressure, is good soil supporting layer; Early Pleistocene Loess Layer is thinner, is yellowish-brown, more closely knit than Middle Pleistocene loess, and intensity is large, and compressibilty is little, and without settlement by soaking, water permeability is also little.
It is Tunnel Design and the important content in constructing that fender graded does not divide, according to the stability of different surrounding rock, classification is carried out to the various tunnel surrounding of nature, utilizes theory of new Austrian tunnelling method, carrying out the design of Tunnel and secondary lining targetedly, is the basic ideas of construction of tunnel design.A large amount of single, double line railway and two lane vural roads tunnel have been built by China in Canal in Loess Area, although have accumulated abundant engineering experience, achieve the achievement of a considerable number of loess tunnel engineering aspect, but divide for loess tunnel fender graded and there is no corresponding parameter index, and the parameter index of rock country rock is not almost suitable for loess country rock completely, existing related specifications can not provide the recommended value of the main Computational Physics mechanics parameter of loess country rock.So be badly in need of a kind of fender graded method for loess tunnel, be beneficial to Tunnel Design and construction.
Summary of the invention
For overcoming the problems of the prior art, the object of the present invention is to provide
a kind of fender graded method of loess tunnel, the design of loess tunnel preliminary bracing and secondary lining can be carried out targetedly, can difficulty of construction be reduced, be conducive to ensureing construction safety and Stability Analysis of Structures.
For achieving the above object, the technical solution used in the present invention is:
The embodiment of the present invention provides
a kind of fender graded method of loess tunnel, adopt qualitative features division and quantitative target to divide the comprehensive evaluation method combined and loess tunnel country rock be divided into IV
1, IV
2, V
1, V
2with VI Pyatyi; Divide by the adjoining rock stability state after loess forming age, plastic state, joints development degree and tunnel excavation, and the factors such as integrating tunnel engineering and geological feature of soils, underground water and edpth of tunnel, classification has been carried out to loess tunnel country rock; Give loess fender graded index and acquisition methods and the moist degree qualitative value of loess (clay soil) country rock and quantitative corresponding relation.
Compared with prior art, the beneficial effect that has of the present invention:
1, the present invention is based on the corresponding parameter index of loess tunnel country rock, propose the fender graded method of applicable loess tunnel targetedly.
2, based on particularity and the complexity of loess tunnel country rock, the present invention has carried out sub-classification to country rock on the basis of traditional surrounding rock mass classification, thus can better design and construction.
3, the invention provides
a kind of fender graded method of loess tunnel, carry out the design of loess tunnel preliminary bracing and secondary lining targetedly, can difficulty of construction be reduced, ensure that tunnel structure is stablized and construction safety.
Detailed description of the invention
The present invention is
a kind of fender graded method of loess tunnel, concrete steps are:
1, fender graded method essence is the indirect analogy method of engineering, should comprise country rock, supporting, construction method three aspects.Therefore, add up the tunnel deformation monitoring and measurement data in the corresponding supporting parameter situation of fender graded, can analyze this supporting parameter and make the tunnel deformation of this Grades of Surrounding Rock reach stable, the supporting parameter corresponding to fender graded be verified.For ensureing the similar degree of country rock in Tunnel Design stage, loess fender graded employing qualitative features division and quantitative target divide the comprehensive evaluation method combined and loess tunnel country rock are divided into IV
1, IV
2, V
1, V
2with VI Pyatyi
2, loess tunnel fender graded should divide by the adjoining rock stability state index after loess forming age, plastic state, joints development degree and tunnel excavation, and the factors such as integrating tunnel engineering and geological feature of soils, underground water and edpth of tunnel, the basic fender graded in tunnel is revised.The basic fender graded of loess tunnel should be by
table 1requirement divide.
table 1the basic fender graded table of loess tunnel
Note: the division of loess plastic state: hard I
l≤ 0; Hard plastic 0 < I
l≤ 0.25; Plastic 0.25 < I
l≤ 0.75; Softly mould 0.75 < I
l≤ 1; Stream moulds I
l> 1.
3, loess tunnel fender graded can be revised by following principle on the basis of basic classification:
(1) when loess index of plasticity Ip≤10,1 substate can be reduced;
(2) shallow embedding location Grades of Surrounding Rock can reduce by 1 grade or 1 substate;
(3) when have more than 2 to meet factor that above-mentioned fund specifies, do not answer simple superposition, need consider in conjunction with geological conditions.Except meeting except VI grade of country rock feature through exploration confirmation, generally fender graded should directly not be downgraded to VI grade.
4, loess fender graded index and acquisition methods
Loess fender graded index and acquisition methods reference
table 2select.
table 2loess fender graded index and acquisition methods table
5, the moist degree qualitative value of loess (clay soil) country rock and quantitative corresponding relation
The moist degree qualitative value of loess (clay soil) country rock and quantitative corresponding relation reference
table 3select.
table 3the moist degree qualitative value of loess (clay soil) country rock and quantitative mapping table
Claims (1)
1. a fender graded method for loess tunnel, is characterized in that: adopt qualitative features division and quantitative target to divide the comprehensive evaluation method combined and loess tunnel country rock is divided into IV
1, IV
2, V
1, V
2with VI Pyatyi; Divide by the adjoining rock stability state after loess forming age, plastic state, joints development degree and tunnel excavation, and the factors such as integrating tunnel engineering and geological feature of soils, underground water and edpth of tunnel, classification has been carried out to loess tunnel country rock; Give loess fender graded index and acquisition methods and the moist degree qualitative value of loess (clay soil) country rock and quantitative corresponding relation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510145026.XA CN104806290A (en) | 2015-03-30 | 2015-03-30 | Loess tunnel surrounding rock classification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510145026.XA CN104806290A (en) | 2015-03-30 | 2015-03-30 | Loess tunnel surrounding rock classification method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104806290A true CN104806290A (en) | 2015-07-29 |
Family
ID=53691442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510145026.XA Pending CN104806290A (en) | 2015-03-30 | 2015-03-30 | Loess tunnel surrounding rock classification method |
Country Status (1)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105160111A (en) * | 2015-09-11 | 2015-12-16 | 山西省交通科学研究院 | Simulation method for loess tunnel numerical model by considering surrounding rock structural characteristics |
| CN105911256A (en) * | 2016-06-17 | 2016-08-31 | 清华大学 | Testing method for quantifying surrounding rock grade |
| CN107278404A (en) * | 2017-07-10 | 2017-10-24 | 大连久鼎祥瑞特种工程技术研究院有限公司 | Change Canal in Loess Area fragile ecological environment and increase the physico-chemical process in arable land |
| CN107476809A (en) * | 2017-09-05 | 2017-12-15 | 长安大学 | A kind of large deformation control method of chlorite schist stratum longspan tunnel |
| CN109783913A (en) * | 2018-12-30 | 2019-05-21 | 中铁十四局集团有限公司 | The supporting construction selection method and device in tunnel |
| CN110513146A (en) * | 2019-08-30 | 2019-11-29 | 东北大学 | A kind of prospective design stage tunnel surrounding large deformation stage division |
| CN110671150A (en) * | 2019-10-14 | 2020-01-10 | 中铁第四勘察设计院集团有限公司 | Surrounding rock grading correction method and device based on tunnel buried depth and weathering layer thickness |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4906132A (en) * | 1987-11-30 | 1990-03-06 | Deilmann-Haniel Gmbh | High-load underground dam |
| CN104198676A (en) * | 2014-08-21 | 2014-12-10 | 同济大学 | Surrounding rock classifying method suitable for milling and excavating of tunnels |
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2015
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| US4906132A (en) * | 1987-11-30 | 1990-03-06 | Deilmann-Haniel Gmbh | High-load underground dam |
| CN104198676A (en) * | 2014-08-21 | 2014-12-10 | 同济大学 | Surrounding rock classifying method suitable for milling and excavating of tunnels |
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| 曹志豪: "延安地区黄土隧道围岩分级研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105160111A (en) * | 2015-09-11 | 2015-12-16 | 山西省交通科学研究院 | Simulation method for loess tunnel numerical model by considering surrounding rock structural characteristics |
| CN105160111B (en) * | 2015-09-11 | 2019-03-08 | 山西省交通科学研究院 | A kind of emulation mode for the loess tunnel numerical model considering surrounding rock structure characteristic |
| CN105911256A (en) * | 2016-06-17 | 2016-08-31 | 清华大学 | Testing method for quantifying surrounding rock grade |
| CN105911256B (en) * | 2016-06-17 | 2017-12-19 | 清华大学 | Quantify the method for testing of country rock grade |
| CN107278404A (en) * | 2017-07-10 | 2017-10-24 | 大连久鼎祥瑞特种工程技术研究院有限公司 | Change Canal in Loess Area fragile ecological environment and increase the physico-chemical process in arable land |
| CN107476809A (en) * | 2017-09-05 | 2017-12-15 | 长安大学 | A kind of large deformation control method of chlorite schist stratum longspan tunnel |
| CN107476809B (en) * | 2017-09-05 | 2019-06-11 | 长安大学 | A kind of large deformation control method of chlorite schist stratum longspan tunnel |
| CN109783913A (en) * | 2018-12-30 | 2019-05-21 | 中铁十四局集团有限公司 | The supporting construction selection method and device in tunnel |
| CN110513146A (en) * | 2019-08-30 | 2019-11-29 | 东北大学 | A kind of prospective design stage tunnel surrounding large deformation stage division |
| CN110671150A (en) * | 2019-10-14 | 2020-01-10 | 中铁第四勘察设计院集团有限公司 | Surrounding rock grading correction method and device based on tunnel buried depth and weathering layer thickness |
| CN110671150B (en) * | 2019-10-14 | 2021-04-27 | 中铁第四勘察设计院集团有限公司 | Surrounding rock grading correction method and device based on tunnel buried depth and weathering layer thickness |
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Application publication date: 20150729 |