tunnel portal

The difficulty also becomes greater. The depth of embedment at the tunnel portal is shallow.

隧道的长度、断面都是空前的,难度也大于以前.

Application of Geodetic Quadrangle Method in Control Survey of Plumbing of Tunnel Portal

大地四边形在隧道洞口投点控制测量中的应用

Numerical simulation of exhaust gas convective diffusion from a tunnel portal

隧道峒口废气对流扩散的数值研究

Application of High-pressure Spiral Jet Grouting Piles in Shield Tunnel Portal Soil Reinforcement Engineering

旋喷桩在盾构法隧道端头井洞口土体加固工程中的应用

It is easily collapsed for shallow and unsymmetrical large-span tunnel near portal in soft rock.

软岩地区浅埋偏压大 跨度 隧道进口段极易塌方.

Based on soil plasticity and upper-bound analysis theory, the earth pressure intensity formula distributing along the tunnel portal length, general earth pressure formula and earth pressure action point formula are derived.

详细推导了运用土体塑性极限分析理论中的上限解方法研究隧道洞门土压力沿隧道洞门墙高的分布土压力公式、总土压力公式及土压力作用点公式。

Method for Geometrical Design of Arcade Tunnel Portal

连拱隧道洞口线形设计方法探讨

Stability analysis of the side slope in the portal section of tunnel with semi-open and semi-underground method

半明半暗法隧道进洞洞口段边坡稳定性研究

Analysis of Earthquake Response and Stability Evaluation for Transverse Slope at Secund Tunnel Portal

偏压隧道洞口边坡地震动力反应及稳定性分析

Tunnel portal is principal part of tunnel structure, it's safety should not be ignored. "

隧道洞门结构是隧道工程主体结构的组成部分,隧道洞门结构的安全问题不容忽视.

By enumerating the risk source in tunnel unkennel construction process, the analytic hierarchy process and fuzzy comprehensive evaluation methods were used to evaluate instability risk of tunnel portal. And the corresponding risk control countermeasures were proposed.

列举出洞施工过程中的风险源，采用层次分析法和模糊综合评价法进行隧道出洞洞口失稳风险评估，提出了对应的风险控制对策。

Taking Dabao Highway as an example, this paper introduces the selection of portal location, design principles and construction of tunnel portal in soft ground.

文章以大保公路为例，介绍了软弱破碎围岩地段隧道洞口位置的选择、设计思路和设计原则以及施工工艺。

Research about Treatment Method for Rill Tunnel Portal Dangerous Crag

小溪隧道口危岩工程治理研究

So the rules of earth pressure distributing along the length and the height of tunnel portal are carried out. The earth pressure action point and the rules of earth pressure variation with tunnel portal-soil friction angle can also be obtained. 2.

得到了沿隧道洞门墙长方向、墙高方向的分布规律、土压力作用点位置及隧道洞门墙-土体之间的摩擦角对隧道洞门上压力的影响规律。

Numerical Simulation of Shock Absorption of Mountainous Tunnel Portal in Highly Seismic Region

高烈度地震区山岭隧道洞口减震问题的数值模拟研究

Analysis of Partial Coefficients of Single-Track Railway Tunnel Portal Structures

单线铁路隧道洞门结构分项系数的研究

The tunnel portal earth pressure is divide into two parts at tunnel lining height, the earth pressure intensity-formula at upper part, below part, general earth pressure formula and earth pressure action point formula are derived.

以隧道衬砌的高度为界，将隧道洞门土压力计算分为上、下两部分，推导出上部上压力强度、下部土压力强度、总土压力及土压力作用点的计算公式。