diff --git a/E03_StabSection/E03_StabSection_Router_WhatIf.py b/E03_StabSection/E03_StabSection_Router_WhatIf.py
index 2893b383c..6eb721d60 100644
--- a/E03_StabSection/E03_StabSection_Router_WhatIf.py
+++ b/E03_StabSection/E03_StabSection_Router_WhatIf.py
@@ -25,7 +25,7 @@ from functools import lru_cache, partial
 from uuid import UUID
 
 from fastapi import APIRouter, HTTPException
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, model_validator
 from shapely.geometry import Point, Polygon
 
 from common_util.common_util_derived_store import (
@@ -79,6 +79,12 @@ class SupportIn(BaseModel):
     hole_dia_mm: float = Field(gt=0.0, le=500.0)
     prestress_kN: float = Field(0.0, ge=0.0)
 
+    @model_validator(mode="after")
+    def _anchor_bond(self) -> "SupportIn":
+        if self.type == "anchor" and not 0 < self.bond_length_m < self.length_m:
+            raise ValueError("앵커 정착장은 0 초과 · 길이 미만")
+        return self
+
 
 class WhatIfRequest(BaseModel):
     side: Literal["left", "right"]
diff --git a/E03_StabSection/E03_StabSection_UI_Support.css b/E03_StabSection/E03_StabSection_UI_Support.css
index 6f6829aa8..c2d8207ed 100644
--- a/E03_StabSection/E03_StabSection_UI_Support.css
+++ b/E03_StabSection/E03_StabSection_UI_Support.css
@@ -17,6 +17,10 @@
   --e03-support: #6250d6;
 }
 
+.e03-support--prestress {
+  --e03-support: #1c74d9;
+}
+
 .e03-support--not_crossing {
   --e03-support: #9a9a9a;
 }
diff --git a/E03_StabSection/E03_StabSection_UI_Support.ts b/E03_StabSection/E03_StabSection_UI_Support.ts
index 528a7a397..7d87b6cfa 100644
--- a/E03_StabSection/E03_StabSection_UI_Support.ts
+++ b/E03_StabSection/E03_StabSection_UI_Support.ts
@@ -79,7 +79,7 @@ const FIELDS: NumKey[] = [
   "prestress_kN",
 ];
 const ANCHOR_ONLY: NumKey[] = ["bond_length_m", "prestress_kN"];
-const MODES = ["tensile", "pullout", "stripping", "not_crossing"] as const;
+const MODES = ["tensile", "pullout", "stripping", "prestress", "not_crossing"] as const;
 
 const fmt = (v: number | null | undefined, d = 2): string =>
   v === null || v === undefined || !Number.isFinite(v) ? "-" : v.toFixed(d);
diff --git a/E03_StabSection/logic/E03_StabSection_Support.ts b/E03_StabSection/logic/E03_StabSection_Support.ts
index 36a6582ff..fb26edeca 100644
--- a/E03_StabSection/logic/E03_StabSection_Support.ts
+++ b/E03_StabSection/logic/E03_StabSection_Support.ts
@@ -10,7 +10,7 @@
 import type { Point } from "./E03_StabSection_Logic";
 
 export type SupportType = "nail" | "anchor";
-export type SupportMode = "tensile" | "pullout" | "stripping" | "not_crossing";
+export type SupportMode = "tensile" | "pullout" | "stripping" | "not_crossing" | "prestress";
 
 /** 서버 · 엔진 입력 꼴(브레인 정함 · sub4 엔진 같은 이름) */
 export interface SupportIn {
@@ -24,7 +24,7 @@ export interface SupportIn {
   /** 종방향 간격 — 단위 폭 힘 = 힘 / 간격 */
   spacing_m: number;
   tensile_kN: number;
-  /** 그라우트 · 지반 부착 — 네일 = 전 길이 · 앵커 = 정착장만 */
+  /** 그라우트 · 지반 부착(인발 안전율 넣은 값 · 엔진이 안 나눔) — 네일 = 전 길이 · 앵커 = 정착장만 */
   bond_kPa: number;
   /** 앵커 정착장 · 네일은 무시 */
   bond_length_m: number;
@@ -56,7 +56,8 @@ export interface SupportLayout {
 }
 
 /** 기본값 후보(사용자 확정 전) — 지식DB 안정성평가 02 §4(천공 φ100 · 풍화토 주면마찰 50~100 kPa ·
- *  SD400 D25 허용 0.6 fy·As = 121.6 kN) · 앵커 = 강연선 φ12.7 × 4 허용 0.6 fpu = 441 kN 흔한 값 */
+ *  SD400 D25 허용 0.6 fy·As = 121.6 kN · 부착 = 극한 주면마찰 ÷ 인발 안전율 2.0) ·
+ *  앵커 = 강연선 φ12.7 × 4 허용 0.6 fpu = 441 kN · 풍화암 주면마찰 150 kPa ÷ 2.0 흔한 값 */
 export const SUPPORT_DEFAULTS: Record<SupportType, SupportLayout> = {
   nail: {
     type: "nail",
@@ -67,7 +68,7 @@ export const SUPPORT_DEFAULTS: Record<SupportType, SupportLayout> = {
     length_m: 6.0,
     angle_deg: 15,
     tensile_kN: 121.6,
-    bond_kPa: 80,
+    bond_kPa: 40,
     bond_length_m: 0,
     hole_dia_mm: 100,
     prestress_kN: 0,
@@ -81,7 +82,7 @@ export const SUPPORT_DEFAULTS: Record<SupportType, SupportLayout> = {
     length_m: 12.0,
     angle_deg: 30,
     tensile_kN: 441,
-    bond_kPa: 150,
+    bond_kPa: 75,
     bond_length_m: 6.0,
     hole_dia_mm: 115,
     prestress_kN: 200,
diff --git a/E05_StabReport/E05_StabReport_Reinforce.py b/E05_StabReport/E05_StabReport_Reinforce.py
index cda63ae27..fa8b9865a 100644
--- a/E05_StabReport/E05_StabReport_Reinforce.py
+++ b/E05_StabReport/E05_StabReport_Reinforce.py
@@ -26,6 +26,7 @@ MODE_NAMES = {
     "pullout": "인발",
     "stripping": "머리 쪽 빠짐",
     "not_crossing": "활동면 안 만남",
+    "prestress": "선인장(능동)",
 }
 SUPPORT_HEAD = ("측점", "비탈 · 조건", "번호 · 종류", "머리 x / z", "길이 m", "각도 °", "간격 m")
 ST_NG, ST_OK = 10, 11
diff --git a/ui_template/ui_template_locale_e03.ts b/ui_template/ui_template_locale_e03.ts
index d4191171f..2b8b49dd7 100644
--- a/ui_template/ui_template_locale_e03.ts
+++ b/ui_template/ui_template_locale_e03.ts
@@ -175,8 +175,8 @@ export const ui_locales_e03 = {
     "Heads are placed on the slope face from the toe at first-row height and vertical spacing, driven into the slope (assumption only · original results unchanged).",
   ],
   E03_Sp_Source: [
-    "기본값 후보(사용자 확정 전) — 지식DB 안정성평가 02 §4: 천공 φ100 mm · 풍화토 주면마찰 50~100 kPa · SD400 D25 허용 121.6 kN · 앵커 = 강연선 φ12.7 × 4 허용 441 kN · 정착장 6 m",
-    "Default candidates (not yet confirmed) — KB stability 02 §4: hole φ100 mm · weathered soil bond 50–100 kPa · SD400 D25 allowable 121.6 kN · anchor = 4 × φ12.7 strand allowable 441 kN · bond length 6 m",
+    "기본값 후보(사용자 확정 전) — 지식DB 안정성평가 02 §4: 천공 φ100 mm · 풍화토 극한 주면마찰 50~100 kPa · SD400 D25 허용 121.6 kN · 앵커 = 강연선 φ12.7 × 4 허용 441 kN · 정착장 6 m · 부착 = 극한 ÷ 인발 안전율 2.0 을 넣은 값(엔진이 다시 나누지 않음 · Slide2 와 같음)",
+    "Default candidates (not yet confirmed) — KB stability 02 §4: hole φ100 mm · weathered soil ultimate bond 50–100 kPa · SD400 D25 allowable 121.6 kN · anchor = 4 × φ12.7 strand allowable 441 kN · bond length 6 m · bond = ultimate ÷ pullout FS 2.0 (engine does not divide again · same as Slide2)",
   ],
   E03_Sp_Type: ["종류", "Type"],
   E03_Sp_nail: ["네일", "Nail"],
@@ -188,7 +188,7 @@ export const ui_locales_e03 = {
   E03_Sp_F_length_m: ["길이 m", "Length m"],
   E03_Sp_F_angle_deg: ["각도 °(수평 아래)", "Angle ° (below horizontal)"],
   E03_Sp_F_tensile_kN: ["인장 한도 kN", "Tensile limit kN"],
-  E03_Sp_F_bond_kPa: ["부착 kPa", "Bond kPa"],
+  E03_Sp_F_bond_kPa: ["부착 kPa(÷ 안전율)", "Bond kPa (÷ FS)"],
   E03_Sp_F_bond_length_m: ["정착장 m", "Bond length m"],
   E03_Sp_F_hole_dia_mm: ["천공 지름 mm", "Hole dia. mm"],
   E03_Sp_F_prestress_kN: ["선인장 kN", "Prestress kN"],
@@ -209,6 +209,7 @@ export const ui_locales_e03 = {
   E03_Sp_Mode_tensile: ["인장", "Tensile"],
   E03_Sp_Mode_pullout: ["인발", "Pullout"],
   E03_Sp_Mode_stripping: ["머리 쪽 빠짐", "Stripping"],
+  E03_Sp_Mode_prestress: ["선인장(능동)", "Prestress (active)"],
   E03_Sp_Mode_not_crossing: ["활동면 안 만남", "Not crossing"],
   E03_Sp_Mode_pending: ["결과 없음", "No result"],
 } as const satisfies Record<string, LocaleEntry>;