抗浮设防水位的推断及其作用分析

Groundwater Level for Prevention of Up-floating Calculation and Effect Analysis

建议设立建设工程抗浮设防标准作为勘察设计的规范性技术依据,通过归纳抗浮设防水位推断计算公式,阐述了最不利条件下各影响因素的涵义,明确其中的地下水位最大年季节性变幅应采用统计分析的上限分位标准值,同时提出组合效应的分析思路;依据地层的水力连续性原理及实际的工程技术条件,分析了弱透水性土层中基础浮托力折减的风险性;强调抗浮分析和设计中应将结构重力按抗力条件取值,并对抗浮设防水位应发挥的功用给予了一些说明。

This paper is proposed to establish a criterion for prevention of groundwater buoyancy on construction design,and give basis for site investigations. Further,with the formula for prevention of groundwater level up-floating, calculating and explaining the meaning of each factor of the most adverse conditions, and recommending technical basis of combination effects for groundwater level. According to the principle of hydraulic continuity, and on other relevant engineering technical conditions,commenting the risk of reduction of groundwater buoyancy on foundations built under an inferior seepage stratum, where the value for construction gravity should be chosen as a resistance during the analysis of foundation up-floating. In addition, the groundwater level parameters for prevention of up-floating could be relevant in other functions.