Sweet Design And Construction Technique Of The GanSu Loess Highway Tunnel Research

Loess tunnel is hard to build and set up an empress a disease to harm a type of more tunnel. This text takes sweet loess highway in the GanSu province tunnel as engineering to rely on that it by passing the engineering geology characteristics that the research tallies up sweet loess tunnel in the GanSu province and the tunnel finite element of the typical model loess analyzes,the tunnel structure of the loess highway designs,the loess highway tunnel opens to dig method and merit and shortcoming,pay to protect of choose a type with excellent turn,the tunnel construction organizes and controls and the tunnel quality examines's method and assesses standard, which got to draw a conclusion in the end:The tunnel number of the loess highway imitates true enunciation: The Chen carves Shu toward pressure to present two sides big middle to distribute a form smallly, due to its stage variety regulation with cover up deeply and have dissimilarity, the biggest side to pressure occurrence position dissimilarity and the side carries a coefficient value toward the lotus in the current norm low; In shallowly cover up the tunnel, a Chen carves an arch department curved Ju middle big two sideses are small, side wall curved the Ju is opposite smaller, the Yang arch pressure presents two sides to distribute regulation greatly and in the center and smallly, it curved Ju is negative curved Ju and the arch waist stalk dint is bigger; In the middle of covering up tunnel deeply, a Chen carves the arch department curved Ju to present a dome, small two sideses distribute sex Tai greatly, the wall feet curved Ju is more and greatly worth, Yang arch pressure with curved the Ju is opposite bigger and the arch waist stalk dint is bigger; Two Chens carve an arch department a curved Ju value smaller which the stalk dint almost is placed in all cloth appearance ,can press the stalk symmetry circle tube theories to carry on an arch department Chen to carve design and strength to check calculate. Shallow cover up the tunnel construction of the loess highway completion behind the ground soaks in water in great quantities, will make the arch top soil body present whole descend to sink trend, the Chen carves Shu toward pressure to enlarge. Soak in water after opening to dig, a Chen carves dome stalk dint to let up, the wall department Chen carves to enlarge with the Yang arch stalk dint. The loess highway tunnel takes place easiest to collapse to fall smallly in the under construction arch department, but along with changing of time, round rock pressure to tend in even distribute, shallow cover up tunnel to round the rock pressure"cat ear" to distribute shape more obvious. The Yang arch is deeply covering up with shallow cover up the function in the tunnel not to exert a homology, the Yang arch is subjected to dint in shallowly cover up the tunnel opposite smaller, but can't act for to the function which supports tunnel structure to stabilize over a long period of time, the Yang arch is subjected to dint in deeply cover up the tunnel opposite more big, and both ends big, in the center small.The loess highway tunnel adopts a two mold to build the design that the Chen carves medium, two Chens bear a lotus to carry opposite smaller, its design calculation design of[with] method and"New Austrian Tunneling Method" contain bigger differentiation. In addition to old loess and don't the red mire rock of morals and custom should not establish three driveway tunnel cross sections outside. The loess tunnel first time Chen starts to carve the arch line above proper adoption to change to cut noodles structure; Two Chens carve the lesser half path arc of the conjunction adoption of Yang arch and side wall; Paid to protect the adoption space grid arch to replace a work word steel arch in the early years.To contain the amount of water not high general proper adoption double side wall of the loess tunnel to lead pit first arch behind the wall positive step method start construction; For the mire rock of the weak saturated loess, morals and custom flabbiness segment and shallow cover up a proper adoption double side wall to lead pit first a wall behind arch anti- step method construction; Knot better old loess in the gum and don't the red mire rock of the morals and custom segment,which it can adopt New Austrian Tunneling Method short step to carry on a construction. Because double driveway tunnel cross section, It can adopt single side wall to lead a pit method(CD method) to carry on a construction, take three driveways big cross section Tan arch tunnel to the urgent parking, can adoption double the side wall leada pit method to carry on a construction.