经验公式:H=0.9A-B式中:H——地槽挖深(米)0.9——经验系数(只适用采暖房屋,不采暖系数为1.1)A——村内实际冻深(米)(可以通过当地打井,挖菜窖等索取数字)B——基底下容许残留冻土厚度(米)注:(1)、当地基土为粉砂,冻结其间地下水位低于冻深1.5米以内时B=0,超过1.5米时 B= Empirical formula: H = 0.9AB Where: H - depth of excavation in the trench (m) 0.9 - experience coefficient (only for heating houses, no heating coefficient is 1.1) A - actual depth in the village (m) (can be passed (Drilling in the local area, digging the vegetable pit, etc.) B - Allowable thickness of permafrost under the base (m) NOTES: (1) The local base soil is silt and when the groundwater level is less than 1.5 meters below the freezing depth =0, more than 1.5 meters when B =