The controlling parameters for smooth blasting in qin - ling zhongnanshan tunnel project are optimized according to the fundamental principle of smooth blasting , considering the minimal resistance , coefficient of embrasure density , coefficient of non - coupling , density of dynamite and rate of exploding . the efficiency of this method has been analyzed and justified by the high speed and good quality of the project 根据光面爆破的基本原理，从最小抵抗线、爆眼密集系数、不耦合系数、线装药密度、爆破进尺等几个方面确定秦岭终南山隧道光面爆破主要参数的选取，分析了该隧道钻爆设计在隧道施工中的运用取得的成效，提高了施工进度，同时也保证了施工质量。
Construction of flat tunnel of large span at extra - shallow depth must be conducted on the principle that advance grouting should be strictly performed before excavation and length of pull at one time should be short , together with reinforced support , immediate closing and constant monitoring and surveying . that preceding pilot tunnels , large - volume excavation divided into small ones , excavation of flank before that of center , upper before lower , arch before wall etc is a good method which could effectively reduce surface subsidence and its adverse effect on adjacent buildings , in addition , some other measures are also taken to lessen blast - induced vibration in the ground and surrounding structures . in a word , all means and steps mentioned above have already proved effective and practicable in practice 软弱大跨超浅埋扁平隧道必须按“管超前，严注浆，多分部、短开挖、强支护、快封闭，勤量测”的施工原则进行施工，采用“眼镜超前，化大为小，先侧后中，先上后下，先拱后墙”的施工方法控制地表沉降和对周边建筑物的影响；采用“多分部，化大为小，短进尺，密布眼，弱装药，设减振槽” ，控制爆破振动，经过实践证明，这些方法都是行之有效的。
Drilling footage and cycle were regarded as two independent variables , while the drilling data accomplished by the changqing drilling engineering company were taken as samples , and then those two hypotheses were testified by the method of statistical analysis to set up a drilling cost forecast model with a strong explanation 构建了钻井进尺和钻井周期两个自变量，并以2003年长庆钻井工程总公司完成的钻井数据为样本，运用统计分析方法来验证这两个很设，并构建成本预测模型，该模型的解释力度较强。
In order to achieve the optimized tunneling approach , first , tunneling procedures , shift length , horizontal jet grouting length , bench length and space length between c and d part of crd method are optimized ; on the basis of these results , two kinds of tunneling schemes are calculated with three - dimensional fem and the optimized tunneling scheme is achieved . as results of the optimized scheme , the conclusion is made that the gas pipe above the tunnel of sk3 + 355 section is secure . the calculation results are verified through comparison of numerical simulation results and site - monitoring measurement data 为得出适合本段工程的最佳施工路线，利用大型有限元通用软件ansys对开挖顺序、开挖进尺、水平旋喷长度、台阶长度及crd工法施工的c 、 d部相错长度进行了有限元数值模拟和优化分析，并利用这些分析结果，进行了两个施工方案的三维有限元动态施工模拟，得出了较优的施工方案，并利用施工后的地表沉降槽曲线，对sk3 + 355断面处隧道上方的煤气管线的安全性进行了分析，得出了利用此施工方案施工不会造成此处煤气管线破坏的结论。
