I. Overview of the Project
The tunnel is located in huangling county between Luochuan and Huangling of Xiyan Railway, and passes through the mountain pass between Jiaokou and Laohewan. The entrance mileage is K6 17+2 18.72, the exit mileage is K6 18+3 13.78, the total length is 1095.06m, and the maximum buried depth of the tunnel is 65438+800m. The straight line length of the tunnel entrance section is 543m, and the straight line length of the tunnel exit section is 552m m. A double-sided slope with a slope of 3‰ in the cave.
There are many kinds of diseases in this tunnel, which are widely distributed and need comprehensive treatment. The main diseases and their distribution are as follows:
(a) the lining is cracked.
1, K6 17+667~+672 arch cracked longitudinally, and the joint length was 5m;
2. Cracks in the right wall of K617+760 ~+780, with a length of 20m；;
3. The left wall of K617+900 ~+930 is cracked longitudinally, and the joint length is 30m；;
4. The left wall of K617+863 ~+890 is cracked longitudinally, and the joint length is 27m；;
5. The wall on the right side of K617+840 ~+920 is cracked longitudinally, and the joint length is 40m；;
6. The left wall of K618+065 ~+095 is cracked longitudinally, and the joint length is 30m；;
7. Oblique cracks in the left wall of K618+058 ~+065, with joint length of 7m;
8. The right wall of K618+092 ~+100 is cracked, and the joint length is 80m；;
9. The left and right side walls of K 618+115 ~+270 are cracked longitudinally, and the joint length is 370 m;
The above 9 places are longitudinal cracks.
Vertical cracks in side wall and circumferential cracks in arch at 10 and K6 18+007, with joint length of 12m.
(2) Backfilling the cavity behind the lining
Left wall: The depth of the cavity behind the lining is mostly between 30 and 40 cm, with a total extension of 49 m. The specific mileage is 1, K6 17+294~+30 12 and K617+403 ~+4/kloc-.
Right wall: the depth of the cavity behind the lining is 20~40cm, with a total extension of 13m. The holes are located at 1, k 617+283 ~+2902, k 618+162 ~+168 *.
(3) Lining reinforcement
1, k 618+115 ~+270, with cracks on the left and right walls,155m; ;
2.K6 17+900~+930, longitudinal crack of left wall, 30m；;
3.K6 17+860~+890, longitudinal crack of left wall, 30m；;
4.K6 18+065~+095, longitudinal crack of left wall, 30m；;
5.K6 17+760~+780, longitudinal crack of right wall, 20m；;
6.K6 17+840~+920, and the longitudinal crack of the right wall is 80m.
In order to enhance the mechanical performance of the structure, anchor grouting and embedding 16 I-steel frame are used to reinforce the cracked section of the upper side wall.
(4) the arch lace wall
There are many arched lace walls in this tunnel, which need to be plugged mainly in the following three sections (*** 10):
1, k6 17+785~+875 left wall;
2. Left wall of K617+715 ~+750;
2. Right wall of K617+775 ~+785;
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