一、工程概况
中科院中关村10 号楼基础埋深标高-12.01m，CFG 复合桩地基，基础
开挖采用土钉墙边坡支护方式，基础底板1.6m 厚，底板外模采用砖砌胎膜，
地下结构底板下及外墙外铺贴两层SBS 防水卷材。
本工程基础底板防水施工后，进行底板胎膜外的2︰8 灰土回填，地
下基础结构施工到±0.00 后，进行地下室肥槽回填。按照设计图纸要求，2
︰8 灰土回填坡度1：0.25，沿建筑物外墙下，底部宽度50cm，上部宽度为
3.35m 范围内填2：8 灰土，其余均以素土回填。
填土压实系数设计无具体要求，按照常规要求一般为0.93~0.95，夯实
后的干密度≥1.45g/cm3。本工程回填土质量控制指标选用干密度。
本工程基坑回填土总量：灰土约2488m3，素土约650m3。回填土

First, project survey
Chinese Academy of Sciences 10 Zhongguancun Building depth of foundation elevation-12.01m, CFG composite pile foundation, foundation
Excavation of a soil nail wall slope protection method of the base 1.6m thick, with brick floor outside the model membranes,
Under the underground structure and exterior floor tiling two SBS waterproofing membrane.
Waterproofing of the base of this project was conducted after the outer membranes of the two bottom ︰ 8 lime filling, land
Infrastructure under construction to ± 0.00 after the fertilizer tank for filling the basement. In accordance with the design drawings, 2
︰ 8 lime filling slope 1:0.25, along the building wall, the bottom width of 50cm, the upper width
3.35m range of 2:8 lime filling, and the remaining are prime soil backfill.
Fill compaction factor design has no specific requirements, in accordance with the general requirements generally 0.93 to 0.95, compaction
Of dry density ≥ 1.45g/cm3. The works selected backfill quality control index dry density.
The total amount of excavation backfill: lime about 2488m3, prime land of about 650m3. Backfill