基于应力路径的软基加载控制标准研究  

Research on Soft Foundation Loading Control Standard Based on Stress Path

作　　者：缪丹 何楚韶 MIAO Dan;HE Chushao(Guangzhou Guangjian Construction Engineering Testing Center Co.,Ltd.,Guangzhou 510080,China;GuangDong Engineering Technology Research Cencer of Building Health Monitoring and Security Early Warning,Guangzhou 510080,China)

机构地区：[1]广州广检建设工程检测中心有限公司,广州510080 [2]广东省建筑物健康监测与安全预警工程技术研究中心,广州510080

出　　处：《广东土木与建筑》2025年第4期35-39,共5页Guangdong Architecture Civil Engineering

摘　　要：软土地基具有含水量高、压缩系数大等特点,采用堆载预压进行软基加固时,极易发生土体失稳,必须进行施工安全监测。为研究堆载施工过程中的监测预警控制标准,首先分析加载过程土的应力路径,提出重点监测孔隙水压力增加阶段,然后基于安全系数建立加载过程中判断软基稳定性的计算方法。当加载安全系数F_(S)>1时,加载处于安全状态;当F_(S)=1时,加载处于极限平衡状态;当F_(S)<1时,应立即停止加载并采取减载措施。结合某堆载预压处理软基实例,采用数值模拟及室内土工试验得到相关计算参数,计算出各级加载过程的安全系数均大于1,表明加载处于安全稳定状态,结合现场监测数据及加载过程中土的强度包络线,验证了安全系数法控制加载的可行性。The soft soil foundation has the characteristics of high water content and large compression coefficient,and when the soft foundation is reinforced by stacking preloading,soil instability is very likely to occur,and construction safety monitoring must be carried out.In order to study the monitoring,early warning and control standards in the process of stacking construction,the stress path of the soil during the loading process was firstly analyzed,the key monitoring pore water pressure increase stage was proposed,and then the calculation method for judging the stability of the soft foundation during the loading process was established based on the safety factor.When the safety factor F_(S)>1 is loaded,the load is in the safe state;When F_(S)=1,the load is in the ultimate equilibrium state;When F_(S)<1,the loading should be stopped immediately and load reduction measures should be taken.Combined with an example of a soft foundation treated with preloading under stacking,the relevant calculation parameters are obtained by numerical simulation and indoor geotechnical test,and the safety factors of the loading process at all levels are calculated to be greater than 1,indicating that the loading is in a safe and stable state,and the feasibility of the safety factor method to control the loading is verified by combining the field monitoring data and the strength envelope of the soil during the loading process.

关 键 词：堆载预压 应力路径 施工监测 安全系数 数值模拟 

分 类 号：TU472.33[建筑科学—结构工程]