地坑放坡宽度（KH）及角体体积（1/3K2H3表）坡 度 系 数（K） 地 坑0.10.250.330.50.67深 度（H）KHKHKHKHKH1/3K2H31/3K2H31/3K2H31/3K2H31/3K2H31.10.360.050.550.110.740.21.20.40.060.60.140.80.261.30.430.080.650.180.870.331.40.460.10.70.230.940.411.50.50.120.750.281.010.511.60.160.010.40.090.530.150.80.341.070.611.70.170.020.430.10.560.180.850.411.140.741.80.180.020.450.120.590.210.90.491.210.871.90.190.020.480.140.630.250.950.572.271.0320.20.030.50.170.660.2910.671.341.22.10.210.040.530.190.690.341.050.771.411.392.20.220.040.550.220.730.391.10.891.471.592.30.230.050.580.250.760.441.151.011.541.822.40.240.050.60.290.790.51.21.151.611.072.50.250.060.630.330.830.571.251.31.682.342.60.260.060.650.370.860.641.31.461.742.632.70.270.070.680.410.890.711.351.641.812.952.80.280.070.70.460.920.81.41.831.883.282.90.290.080.730.510.960.91.452.031.943.6530.30.090.750.560.990.981.52.252.014.0430.310.10.780.621.021.081.552.482.074.463.20.320.110.80.681.061.191.62.732.144.93.30.330.120.830.751.091.31.652.992.225.383.40.340.130.850.821.121.431.73.282.285.883.50.350.140.880.91.161.561.753.572.356.43.60.360.160.90.971.191.691.83.892.416.983.70.370.170.931.061.221.841.854.222.487.583.80.380.180.951.141.251.991.94.572.558.213.90.390.20.981.241.282.151.954.942.618.8840.40.2111.331.322.3225.332.689.584.10.410.231.031.441.352.52.055.742.7510.314.20.420.251.051.541.392.692.16.172.8111.094.30.430.271.081.661.422.892.156.632.8811.94.40.440.281.11.781.453.092.27.12.9512.754.50.450.31.131.91.493.312.257.593.0213.644.60.460.321.152.031.523.532.38.113.0814.564.70.470.351.182.161.553.772.358.653.1515.544.80.480.371.22.31.584.012.49.223.2216.554.90.490.391.232.451.624.272.459.83.2817.650.50.421.252.61.654.542.510.423.3518.7 说明：（1）凡采用矩形地坑挖土方（需放坡者）凡采用简化计算式：V=（a+2C+KH)(b+2C+KH）H+1/3K2H3利用上表查处放坡宽度KH和角锥体积1/3K2H3即可应用本公式进行计算。式中：V地坑挖土体积（包括工作面和放坡，如无工作面时则C=0）a,b分别为坑底的长和宽，H为坑深K为坡度系数，C为工作面。
(2)基础工程施工所需要增加的工作面，按施工组织设计规定计算。若无规定时，按下列规定计算：
①毛石砌筑，每边增加工作面15厘米。
②混凝土基础或混凝土基础垫层需支模板时，每边增加工作面30厘米。 ③使用卷材或防水砂浆做垂直防潮层时，每边增加工作面60厘米。
（3）挖土方、地槽、地坑和管沟等土方工程，当无地下水在挖天然湿度的土壤时，普通土在1.25米深以内，坚土在1.5米深以内，均不计放坡。超过以上深度，无规定者，按下计算。深 在 5 米 以 下 的 放 系 数土壤类别人工挖土机械在坑、槽底普 通 土坚 土砂砾坚土1:0.671:0.331:.251:0.51:0.251:0.1机械在坑、槽边1:0.751:0.671:0.33机 械 挖 土
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