limit of excavation meaning in English
开挖范围线
Examples
- All the results can be utilized by engineers , during the designing and construction . the main conclusions are listed as follows : ( 1 ) based on the shortest line between weak interbed and limit of excavation and the location of point of intersection between limit of excavation , classification of weak interbed distribution is set up , and the distance of distribution is defined ; ( 2 ) according to the strength and deformation equivalent principle , influence zone of weak interbed is introduced , and a new method to simulating the weak interbed with thickness is built ; ( 3 ) some quantificational results on influence of weak interbed respectively at crown , right shoulder and right wall are summarized ; ( 4 ) some quantificational results on influence of weak interbed with the distance between weak interbed and limit of excavation 0 . 2d , 0 . 5d , l . od are gained ; ( 5 ) some quantificational results on influence of weak interbed in the rock mass with confining coefficient 0 . 38 , 1 . 0 , 1 . 5 , 2 . 0 , 3 . 0 are summed up ; ( 6 ) some quantificational results are summarized on influence of the underground surrounding rock mass stability with weak interbed , in the representational surrounding rock mass graded ii , iii , iv ; ( 7 ) according to the studying results some advices are suggested on designing of underground engineering
主要结论如下： ( 1 )以软弱夹层到开挖轮廓线最短距离和最短距离线与开挖轮廓线的交点位置为指标对软弱夹层的分布部进行了分类，并确定了软弱夹层分布距离； ( 2 )根据强度等效和变形等效的原则，引入了软弱夹层影响带的概念，建立了模拟软弱夹层厚度的一种新方法； ( 3 )总结出了软弱夹层分布在拱顶、右拱肩、右边墙时对地下洞室稳定性影响的量化指标； ( 4 )分析出了软弱夹层距开挖轮廓线0 . 2d 、 0 . 5d 、 1 . 0d三种情况对地下洞室稳定性影响的量化指标； ( 5 )总结出了在不同的侧压力系数( 0 . 38 、 1 . 0 、 1 . 5 、 2 . 0 、 3 . 0 )地应力场中软弱夹层对稳定性影响的量化指标； ( 6 )得出了在、 、代表性围岩中软弱夹层对稳定性影响量化结果； ( 7 )根据数值试验成果提出了在有软弱夹层围岩中地下洞室设计原则的几点新内容。 - In this paper , systematic numerical test have been carried out to study the stability of surrounding rock mass with different distribution of weak interbed , different distance between weak interbed and limit of excavation , different thickness of weak interbed , in the different confining coefficient and representational surrounding rock mass graded ii , iii , iv . all of the numerical modeling is plain - strain type with elastic - plastic constitutive law and mohor - coulomb failure criterion , through the integrated numerical analysis program final . plentiful numerical test results have been drawn via analyse the deformation , tensile stress region , plastic region of surrounding rock and the stress status of shot - crete
大量的工程实践表明，软弱夹层对地下洞室围岩稳定性的影响有着决定性的作用，本文以大型数值仿真分析系统final为平台，采用弹塑性应力应变关系和m - c屈服准则建立平面应变问题有限元模型，对软弱夹层的分布部位、分布距离、软弱夹层的厚度对围岩稳定性的影响以及在具有不同侧压力系数的地应力场中和、 、类代表性围岩中软弱夹层对围岩稳定性的影响进行了系统的数值试验，研究得出了软弱夹层对围岩位移、拉应力区、塑性区以及喷射混凝土层内力等影响丰富的量化成果，以便直接为工程设计人员提供参考。