筏型基础下黏性土地层控制性勘探孔深度确定方法探讨  

On Ways to Determine the Depth of Controlled Exploration Holes in the Cohesive Soil Layer under the Raft-style Foundation

作　　者：张云 陈焕军 刘佳 Zhang Yun;Chen Huanjun;Liu Jia

机构地区：[1]湖北省地质局第一地质大队,湖北黄石435100

出　　处：《重庆建筑》2022年第3期48-51,共4页Chongqing Architecture

摘　　要：在岩土工程详细勘察工作中,勘探孔深度的确定必须具有一定的合理性和经济性,对需作变形验算的地基,确定控制性勘探孔的深度不仅要考虑地基承载力的要求,还要考虑变形验算的要求。该文以《岩土工程勘察规范》(GB 50021—2001)(2009年版)、《建筑地基基础设计规范》(GB 50007—2011)及相关理论为依据,并结合多个在黏性土地层中设计采用筏型基础的案例进行了分析,探讨了这类案例考虑变形验算的控制性勘探孔深度的确定方法,同时针对目前行业内详细勘察工作中关于勘探孔深度的确定提出了相关建议,认为勘察勘探孔深度应根据该孔的目的进行有针对性的确定,同时,在外业过程中,应根据收集到的相关资料和数据进行孔深动态优化调整,而非严格按照设计或勘察方案的要求进行固化勘探孔施工,在满足设计要求的同时,保证经济合理。In detailed geotechnical engineering investigation,the determination of the exploration hole depth must be rational and economy.For the foundation demanding deformation checking,the controlled exploration hole depth should not only consider the requirement of the foundation’s bearing capacity,but also that of deformation checking.Based on Code for Investigation of Geotechnical Engineering(GB 50021-2001)(the 2009 edition),Code for Design of Building Foundation(GB 50007-2011),and relevant theories,this paper analyzed several cases of raft-style foundation design in cohesive soil layer,including the way to determine the depth of controlled exploration hole considering deformation checking in such type of cases,and proposed suggestions for the determination in the current detailed industrial exploration.This paper holds that the determination of exploration hole depth in detailed investigation should be based on the designed purpose of the hole,and in the field process,hole depth should be dynamically adjusted and optimized in accordance with the collected information and data rather than solidifying exploratory holes as required by the design or survey plan,which can meet the design requirements and ensure economic rationality as well.

关 键 词：岩土工程勘察 变形计算深度 勘探孔 附加应力 沉降量 

分 类 号：TU195[建筑科学—建筑理论]