Soil class overview map for earthworks according to DIN18300:2012-09 (return) 1: 50 000 — Predominant ground class from 1 to 2 m

Since 2015, according to VOB and DIN 18300:2016-09, homogeneity ranges to be defined according to VOB and DIN 18300:2016-09 have to be defined instead of the previously generally defined soil classes. For these homogeneity ranges, the properties and characteristics specified in accordance with DIN 18300:2016-09 and their bandwidth, which may require targeted field and laboratory tests, must be specified. Homogeneity ranges can usually only be defined with the planning and information on process techniques. Since the “floor classes according to DIN 18300:2012-09” were used in many existing plans/construction projects and are still being used in old projects, the soil class overview map according to DIN 18300:2012-09 is further presented for a transitional period. For the planning, calculation and billing of earthworks, the upcoming sediments and rocks were divided into so-called soil classes according to the General Technical Contract Conditions for Construction Services (ATV) in the Procurement and Contract Regulations for Construction Services (VOB). For earth and rock works according to DIN 18300:2012-09 the soil class classifications contained in this DIN applied. Soil class 1: Top floor Soil class 2: Flowing soil types Soil class 3: Easily detachable soil types Soil class 4: Medium detachable soil types Ground class 5: Hard-to-resolvable soil types Ground class 6: Easily soluble rock and comparable soil types Floor class 7: Hard-to-resolvable rock For preliminary planning purposes, maps of the soil classes for earthworks according to DIN 18300:2012-09 in scale 1:50,000 up to 2 m depth (from GOK) were derived from the soil map of Lower Saxony 1:50,000 (BK50). The area units shown in the BK50 are based on a typical soil profile. Corresponding soil groups according to DIN 18196, soil classification for structural engineering purposes, were assigned to the soil types contained therein. The soil groups and solid rocks were assigned to the corresponding soil classes according to the classification criteria of DIN 18300:2012-09. The highest soil class in the depth profiles are shown: 0 m to 1 m, as well as 1 m to 2 m and the predominant soil classes (weighting by thickness, max. 3 classes with equal weighting) in the depth profiles: 0 m to 1 m, 1 m to 2 m, and 0 m to 2 m. The actual ratios may differ from the scale homogenised map representation. For example — in the Auesediments of the Elbe, Leine and Weser (Soil Classes 2 and 4) — locally low-powered block layers are known, which would be assigned to soil classes 5 or 6. It is noted that the “Soil Class Overview Map for Earthworks according to DIN 18300:2012-09 1:50 000” cannot replace a geotechnical exploration of the building ground according to DIN EN 1997 2:2010-10 with supplementary regulations DIN 4020:2010-12 and the national Annex DIN EN 1997 2/NA:2010-12.自2015年起，依据VOB与DIN 18300:2016-09的要求，需按照该标准界定均质范围，替代此前通用的土类划分规则。针对此类均质范围，必须明确依据DIN 18300:2016-09规定的各项属性与特征，及其允许的波动区间——这一工作往往需要开展针对性的现场勘测与实验室测试。均质范围通常仅能结合工艺技术相关规划与信息予以界定。 鉴于诸多既有规划/建筑项目已采用"DIN 18300:2012-09规定的地坪等级"，且老旧项目仍在沿用该分级体系，因此过渡阶段仍需提供依据DIN 18300:2012-09编制的土类概览图。 为开展土方工程的规划、计算与计价工作，需根据《建筑服务采购与合同条例》（VOB）中的《建筑服务通用技术合同条件》（ATV），将待开挖的沉积物与岩石划分为所谓的土类。 依据DIN 18300:2012-09进行土石工程作业时，需采用该DIN标准中规定的土类分级规则。 土类1：表层土 土类2：流态土类 土类3：易剥离土类 土类4：中等剥离难度土类 土类5：难剥离土类 土类6：易溶岩及同类土类 土类7：难剥离岩石 为满足初步规划需求，基于下萨克森州1:5万比例尺土壤图（BK50），推导得到了依据DIN 18300:2012-09编制的、比例尺为1:5万、覆盖0至2米深度（数据源自GOK）的土方工程土类分布图。 BK50中的面积单元基于典型土壤剖面划定。 将其中包含的土类对应至依据DIN 18196（建筑工程用土壤分类标准）划分的相应土组。 依据DIN 18300:2012-09的分级准则，将上述土组与硬质岩石归至对应的土类中。 本次展示的深度剖面中最高层级的土类涵盖：0米至1米、1米至2米深度范围，以及深度剖面内占比最高的土类（按厚度加权，最多选取3个权重均等的土类），覆盖区间为0米至1米、1米至2米及0米至2米。 实际占比情况可能与该比例尺均质化地图的呈现结果存在差异。例如在易北河、莱讷河与威悉河的河漫滩沉积物中（对应土类2与土类4），存在局部薄层块状岩层，此类岩层应划归土类5或土类6。 需特别说明的是，依据DIN 18300:2012-09编制的1:5万比例尺土方工程土类概览图，无法替代依据DIN EN 1997-2:2010-10，并补充DIN 4020:2010-12及国家附录DIN EN 1997-2/NA:2010-12的建筑场地岩土工程勘察工作。