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第二分界
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  the second boundary
     The results show that in single-track railway tunnel, the first boundary value of high hydraulic pressure upon upright wall lining is 0.05-0.10 MPa and the second boundary value is 0.18 MPa;
     研究结果表明:单线铁路隧道直墙式衬砌高水压第一分界值为0.05~0.10MPa,第二分界值为0.18MPa;
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     The first boundary value of high hydraulic pressure upon curved wall lining is 0.20 MPa and the second boundary value is 0.40 MPa.
     曲墙式衬砌高水压第一分界值为0.20MPa,第二分界值为0.40MPa。
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     Secondly, legalization.
     第二
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     第二
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  the second boundary
The existence and uniqueness of classical global solutions and the nonexistence of global solutions to the first boundary value problem and the second boundary value problem for the equation utt-a1uxx-a2uxxt=?(ux)x are proved.
      
Asymptotic approximation of a periodic solution of the second boundary-value problem for systems with small diffusion
      
Isoperimetric estimates of the second boundary value problem for the Poisson equation
      
The Second Boundary-Value Problem for Pseudoparabolic Equations in Noncylindrical Domains
      
Conventional accumulation of positive charge occurs at the second boundary of the structure and is typical also of initial (unmodified) silicon-on-insulator structures.
      
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How much of hydraulic pressure value upon lining may be intituled high hydraulic pressure? Now, there isn’t clear boundary value in the field of tunnel engineering. The boundary value of high hydraulic pressure was researched by calculating and analyzing the safety factor of lining whether achieving the railway tunnel design code requirement or not, using plane FEM based on standard design drawings of single-track railway tunnel, needn’t change the shape of standard design cross-section as principle. The results...

How much of hydraulic pressure value upon lining may be intituled high hydraulic pressure? Now, there isn’t clear boundary value in the field of tunnel engineering. The boundary value of high hydraulic pressure was researched by calculating and analyzing the safety factor of lining whether achieving the railway tunnel design code requirement or not, using plane FEM based on standard design drawings of single-track railway tunnel, needn’t change the shape of standard design cross-section as principle. The results show that in single-track railway tunnel, the first boundary value of high hydraulic pressure upon upright wall lining is 0.05-0.10 MPa and the second boundary value is 0.18 MPa; The first boundary value of high hydraulic pressure upon curved wall lining is 0.20 MPa and the second boundary value is 0.40 MPa. Hydraulic pressure is the main load upon lining when its value is higher. The boundary value of high hydraulic pressure is rarely related to the surrounding rock classification but is closely related to the shape of lining section. Curved wall lining’s capacity hydraulic pressure bearing is far higher than upright one. The capacity hydraulic pressure bearing of standard design section in single-track railway tunnel is limited. Other optimized sections should be used when static head is higher than 40m.

作用在隧道衬砌上的水压力多大称为高水压?隧道工程界一直没有明确的分界值。以单线铁路隧道标准设计图为基础,以不用改变标准设计断面形状为原则,采用平面有限元方法计算和分析了衬砌的安全系数能否满足规范要求,研究了隧道衬砌高水压分界值。研究结果表明:单线铁路隧道直墙式衬砌高水压第一分界值为0.05~0.10MPa,第二分界值为0.18MPa;曲墙式衬砌高水压第一分界值为0.20MPa,第二分界值为0.40MPa。水压力较大时,水压力成为衬砌结构上的主要荷载,高水压力分界值与围岩级别的关系不大,而与衬砌断面形状关系密切,曲墙式衬砌承受水压力的能力远远超过直墙式衬砌。单线铁路隧道按标准设计断面如果要承受水压也是有限的,超过40m的静水头最好采取其它优化型式的断面。

 
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