平均断面法土方量计算器

Earthwork Volume from Two End Areas

Compute earthwork volume between two cross-sections from their end areas and spacing.

📐 计算公式
平均断面法土方量(本页代码口径):V=(A₁+A₂)÷2×L(m³,A₁/A₂ 两端断面面积 m²、L 断面间距 m);联动量:平均断面面积=(A₁+A₂)÷2(m²)、两端面积差=|A₁−A₂|(m²)。校验:无强校验,空值按 0 兜底。判据:无固定分级,两端面积差越大该法误差越明显,宜加密断面。

输入两端断面面积 A₁、A₂ 与间距 L,求体积。

Formula & Standard References

Item Formula / Note Source / Standard
Average end-area method V = (A1 + A2)/2 · L GB 50026-2020, Code for engineering surveying
Prismoidal formula V = L/3 · ( A1 + A2 + sqrt(A1 · A2) ) GB 50026-2020, Code for engineering surveying (earthwork volume)
Difference between the two The average end-area method errs more as end areas differ; prefer the prismoidal formula then GB 50026-2020, Code for engineering surveying
Units Volume in cubic metres, area in square metres and spacing in metres GB 50026-2020, Code for engineering surveying
📌 计算说明
  • 相邻断面取平均乘间距。
  • (10+20)/2×50 → 750 米³。

📚 深度解析:平均断面法体积

💡 常见使用场景

断面
A₁=120、A₂=80、L=15m → V=(120+80)/2×15=1500 m³。
分段
全线按桩号断面两两相邻算再求和,得总挖/填方。

❓ 常见问题(FAQ)

和棱镜体区别?
平均断面=(A₁+A₂)/2×L;棱镜体=L/6(A₁+4Am+A₂) 更准(含中截面),线性变化两者等。
间距均一吗?
间距应相等或逐段用对应 L,混距直接套会错。