스텝10에서 에러가 발생이 되는 이유를 알고 싶습니다.
그리고 정상적으로 프로그램이 실행 될려면 어떨게 해야 되는지...

PROJECT 본선 Type8-yR 42K+138 (BH-6)

SOIL 1 매립층
3.0 1.8 0.9 0.0 30 1920
2 충적층(SM)
4.6 1.8 0.9 0.0 33 2400
3 충적층(GM)
10.3 1.9 1.0 0.0 35 3280
4 풍화토
11.0 2.0 1.1 1.5 33 4090
5 풍화암
11.5 2.1 1.2 3.0 33 8600
6 연암
14.6 2.3 1.4 5.0 35 28800
7 경암
20.0 2.6 1.7 20.0 40 83000

VWALL 1 19.9 0.01348 0.000215 21000000 1.52 0.915 0.305

STRUT 1 0.9 0.02355 7.50 2.0 0
2 2.0 0.01348 7.50 2.8 0
3 5.1 0.01348 7.50 2.8 15
4 7.6 0.01348 7.50 2.8 0
5 12.6 0.01348 7.50 2.8 0

ANCHOR 1 10.1 0.0003948 30 7.0 1.5 35
2 15.4 0.0003948 30 5.0 3.0 35

SLAB 1 18.0 0.4 5.0

WALL 1 14.1 18.0 0.3

DIVISION 0.1

STEP 1 excavation to 1.4
Rankine 1.0 0 0
surcharge 1.3
gwl 5.3 5.3 1.0
iteration 10 0.1
excavation 1.4

STEP 2 strut 1 & exca 2.5
const strut 1
excavation 2.5

STEP 3 strut 2 & exca 5.6
const strut 2
water pressure 5.3 0.0 11.0 5.7 11.5 0.0
excavation 5.6

STEP 4 strut 3 & exca 8.1
const strut 3
excavation 8.1

STEP 5 strut 4 & exca 10.6
const strut 4
excavation 10.6

STEP 6 anchor 1 & exca 13.1
const anchor 1
excavation 13.1

STEP 7 strut 5 & exca 15.9
const strut 5
excavation 15.9

STEP 8 anchor 2 & exca 18.4
const anchor 2
excavation 18.4
ground settlement
insertion check

STEP 9 const slab 1, remove anchor 2
const slab 1
remove anchor 2

STEP 10 remove strut 5
remove strut 5

end