step 13~14(락볼트 설치단계)에서 수렴하질 않습니다.
경암의 C 값을 553.0에서 8.5 정도까지 줄이면 수렴을 하지만,
경암부분에서 토압이 미세하게나마 발생합니다.
수렴하지 않는 원천적인 이유와 적절한 해결방안 좀 알려주세요...

project 동일

soil 1 매립토
1.7 1.70 0.70 0.0 28.00 3000.0
2 풍화토
10.0 1.90 0.90 1.40 28.00 3000.0
3 풍화암
17.7 2.00 1.00 2.70 30.00 5000.0
4 연암
21.2 2.40 2.10 127.0 33.00 8000.0
5 경암
40.0 2.50 2.10 553.0 45.00 8000.0

vwall 1 30.34 0.01198 0.000204 21000000 2 0.900

STRUT 1 0.8 0.02355 5.7 2 0
2 2.75 0.01198 16.5 2.5 0
3 5.1 0.01198 16.5 2.5 0
4 6.75 0.01198 16.5 2.5 0
5 8.4 0.01198 16.5 2.5 0
6 10.9 0.01198 16.5 2.5 0
7 13.4 0.01198 16.5 2.5 0
8 15.8 0.01198 16.5 2.5 0
9 18.1 0.01198 16.5 2.5 0
10 20.15 0.01198 16.5 2.5 0
11 22.5 0.01198 16.5 2.5 0

ANCHOR 1 24.7 0.0010134 0 5 2
2 26.9 0.0010134 0 5 2

division 0.2
output 1

step 1 exca to 1.3
iteration 20 0.1
surcharge 1.0
rankine 1.0 0 50
exca 1.3
gwl 1.0 1.3 1.0

step 2 strut 1 and exc to 3.25
const strut 1
exc 3.25
gwl 1.0 3.25 1.0

step 3 strut 2 and exc to 5.6
const strut 2
exc 5.6
gwl 2.6 5.6 1.0

step 4 strut 3 and exc to 7.25
const strut 3
exc 7.25
gwl 4.25 7.25 1.0

step 5 strut 4 and exc to 8.9
const strut 4
exc 8.9
gwl 5.9 8.9 1.0

step 6 strut 5 and exc to 11.4
const strut 5
exc 11.4
gwl 8.4 11.4 1.0

step 7 strut 6 and exc to 13.9
const strut 6
exc 13.9
gwl 10.9 13.9 1.0

step 8 strut 7 and exc to 16.3
const strut 7
exc 16.3
gwl 13.3 16.3 1.0

step 9 strut 8 and exc to 18.6
const strut 8
exc 18.6
;gwl 15.6 18.6 1.0
water pressure 14.7 0.0 17.7 3.0 17.7 0.0

step 10 strut 9 and exc to 20.65
const strut 9
exc 20.65
water pressure 14.7 0.0 17.7 3.0 17.7 0.0

step 11 strut 10 and exc to 23.0
const strut 10
exc 23.0
water pressure 14.7 0.0 17.7 3.0 17.7 0.0

step 12 strut 11 and exc to 25.2
const strut 11
exc 25.2
water pressure 14.7 0.0 17.7 3.0 17.7 0.0

step 13 anc 1 and exc to 27.4
const anc 1
exc 27.4
water pressure 14.7 0.0 17.7 3.0 17.7 0.0

step 14 anc 2 and exc to 28.84
const anc 2
exc 28.84
water pressure 14.7 0.0 17.7 3.0 17.7 0.0
insertion check
ground settlement check

end