Tunnel structure soft rock large deformation grading method

A classification method and large deformation technology, applied in earthwork drilling, wellbore/well components, mining equipment, etc., can solve problems such as inability to classify large deformation of tunnel surrounding rock

Active Publication Date: 2020-07-17
CHINA RAILWAY ERYUAN ENG GRP CO LTD +1
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  • Abstract
  • Description
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Problems solved by technology

Therefore, the strength-stress ratio cannot fully represent and reflect the influence of the above factors on the large deformation, and the classification method that only considers the strength-stress ratio cannot accurately classify the large deformation of the tunnel surrounding rock

Method used

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  • Tunnel structure soft rock large deformation grading method
  • Tunnel structure soft rock large deformation grading method
  • Tunnel structure soft rock large deformation grading method

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Embodiment Construction

[0017] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0018] refer to figure 1 , figure 1 Shows the flow chart of the large deformation classification method for soft rock in tunnel structure; figure 1 As shown, the method S includes steps S1 to S6.

[0019] In step S1, the topography, stratum lithology, geological structure and geostress data of the tunnel section to be studied are obtained; stratum age information, stratum thickness and occurrence, the angle between the ro...

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Abstract

The invention discloses a tunnel structure soft rock large deformation grading method. The method comprises the following steps that topography and landform, stratum lithology, geological structure and ground stress data of a tunnel section to be researched are acquired; whether the to-be-researched tunnel section meets a set condition or not is judged, if the to-be-researched tunnel section meetsthe set condition, the next step is entered, and if the to-be-researched tunnel section does not meet the set condition, an algorithm is ended; whether the collected ground stress data are complete or not is judged, if the collected ground stress data are complete, the last step is entered, and if the collected ground stress data are not complete, the next step is entered; the large deformation level of a surrounding rock structure of the to-be-researched tunnel section is primarily judged to be level I, level II, level III or no large deformation; ground stress data, which are not acquired before, of the to-be-researched tunnel are acquired by adopting field measurement or numerical inversion; and a rock mass strength-stress ratio is calculated according to the maximum normal stress andthe rock mass strength in the direction perpendicular to the tunnel axis, and the large deformation level of the surrounding rock structure of the to-be-researched tunnel is judged in detail accordingto the rock mass strength-stress ratio.

Description

technical field [0001] The invention belongs to the field of geological survey of tunnel engineering, and in particular relates to a method for grading large deformation of soft rock in tunnel structure. Background technique [0002] With the rapid development of underground engineering construction in the fields of transportation, water conservancy, and energy, a large number of deep and long tunnels have emerged. The complex geological structure background and the special mechanical properties of the surrounding rock make the large deformation of the surrounding rock of this type of tunnel very prominent, and the safety and long-term service stability of the tunnel structure are seriously threatened. Since the first severe large deformation of the surrounding rock occurred on Line I of the New Pullen Tunnel in the early 20th century, there have been many cases of large deformation of the surrounding rock in tunnel engineering at home and abroad, which have brought major sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/00E21F17/18E21B49/00
CPCE21B49/00E21F17/00E21F17/18
Inventor 张广泽张茹王栋张志龙徐正宣任利冯君贾哲强柴春阳张泽天袁传保郑良娟陶玉敬杨轶茗王振友张安林覃黎邓建辉
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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