A Calculation Method for Seismic Fortification Length of Tunnel Entrance Section
A calculation method and tunnel technology, which is applied in tunnels, mining equipment, earthwork drilling and mining, etc., can solve the problem that there is no clear conclusion on the fortification length of the tunnel entrance section, and achieve the effect of improving integrity and accuracy
Inactive Publication Date: 2017-03-29
SOUTHWEST PETROLEUM UNIV
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Even though many achievements have been made in the research on the seismic fortification of the tunnel entrance, there is still no clear conclusion on the fortification length of the tunnel entrance.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0079] figure 2 Shown is the schematic diagram of the unit taken out with length dx from the foundation beam by the present invention. For the beam element, it can be obtained from the dynamic balance condition:
[0080]
[0081] In the formula:
[0082] Q is the beam section shear force, v(x,t) is the tunnel lateral displacement, ρ is the beam density, s is the beam cross-sectional area, k l is the lateral deformation coefficient of the foundation beam, g l (x, t) is the lateral displacement of foundation soil.
[0083] From the moment balance condition, we can get:
[0084]
[0085] In the formula:
[0086] M is the bending moment of the beam.
[0087] Simplify the above formula to get:
[0088]
[0089] Substitute formula (3.2) into formula (3.1):
[0090]
[0091] From elementary bending theory we get:
[0092]
[0093] In the formula:
[0094] E is the modulus of elasticity of the beam, I is the moment of inertia of the beam section,
[0095] Subs...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a calculation method of an anti-seismic fortified length at a tunnel portal section. The method comprises the steps that 1, analysis is conducted on a foundation beam element, 2, a coefficient of lateral deformation eta<1> and a coefficient of axial deformation eta<2> of a tunnel are led in, and a modified seismic wave shape displacement equation is obtained; 3, the coefficient of lateral deformation eta<1> and the coefficient of axial deformation eta<2> are obtained through calculation; 4, according to the second step and the third step, a corresponding maximum bending stress equation and a corresponding maximum axial stress equation are obtained; 5, a revised maximum bending stress equation and a revised maximum axial stress equation are obtained; 6, all the parameter values of the revised maximum bending stress equation and the revised maximum axial stress equation are determined; 7, the maximum anti-seismic fortified length of a tunnel is calculated according to the parameter values. According to the calculation method of the anti-seismic fortified length at the tunnel portal section, a specific solution is provided for the fortified length at the tunnel portal section, and the integrity and the accuracy of calculation of the fortified length at the tunnel portal section in the prior art are improved.
Description
technical field [0001] The invention relates to the anti-seismic field of tunnels, in particular to a method for calculating the anti-seismic fortification length of a tunnel entrance section. Background technique [0002] The research on the seismic damage characteristics of tunnels began at the beginning of this century. Scholars at home and abroad conducted preliminary research on the damage degree of tunnel lining structures and the causes of earthquake damage through on-site investigations. Such as W.L.Wang et al. (W.L.Wanga, T.T.Wangb, f, J.J.Sua. Assessment of damage in mountain tunnels due to the Taiwan Chi-ChiEarthquake. Tunnelling and Underground Space Technology, 2011, 16: 133-150.) According to Taiwan Chi-Chi Earthquake According to the damage degree of 57 mountain tunnels, the damaged tunnels are divided into three grades: no damage, slight damage and severe damage, and the possible reasons for the earthquake damage of the tunnel lining structure are given. Dom...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/14
Inventor 张军伟杨婉赵成林马小杰梅志荣钱进
Owner SOUTHWEST PETROLEUM UNIV