降水引起的结构性软土非线性沉降固结分析  

Nonlinear Settlement and Consolidation Analysis of Structured Soft Soil Induced by the Drop of Groundwater Level

作　　者：姜慧宇 JIANG Huiyu(China Railway Construction Group Co.Ltd.,Beijing 100040,China;China Railway Construction Group North China Engineering Co.Ltd.,Tianjin 300000,China)

机构地区：[1]中铁建设集团有限公司,北京100040 [2]中铁建设集团华北工程有限公司,天津300000

出　　处：《铁道建筑技术》2023年第12期58-62,共5页Railway Construction Technology

基　　金：中铁建设集团有限公司科技研发计划项目(LX22⁃38c)。

摘　　要：基于分段线性差分法,构建一种承压层降水引起的结构性软土一维非线性沉降固结模型。该模型能考虑土体非线性压缩特征及渗透性关系,压缩曲线计算时可以考虑不同土体结构性强弱。基于模型编写计算程序,结合算例分析,探讨不同压缩指标阶段下土体结构性强弱、土体自重以及渗透指数对降水引发的地层沉降固结问题的影响。结果表明:土体结构性对地层沉降固结影响显著,忽略土体结构性将低估降水引发的土层沉降量;考虑土体自重条件下,土体最终沉降量减小、固结速度减慢;渗透指数C_(k)不影响土体最终沉降量,但C_(k)值越大,土体固结沉降速度越快。Based on the piecewise linear difference method,a one⁃dimensional nonlinear settlement and consolidation model of structural soft soil caused by precipitation in a confined layer was established.This model can consider the nonlinear compressibility and permeability relationships of the soil,and different soil structural strengths can be considered in the calculation of compression curves.The model was programmed and combined with case analysis to explore the effects of soil structural strength,soil self weight,and permeability index on the settlement and consolidation of strata caused by precipitation at different compression index stages.The results show that the soil structure has a significant impact on the settlement and consolidation of strata,and ignoring the soil structure will underestimate the amount of soil settlement caused by precipitation;considering the self weight of the soil,the final settlement of the soil decreases and the consolidation speed slows down;the permeability index C_(k) has no effect on the final settlement of the soil,and the larger the C_(k) value,the faster the soil consolidation settlement.

关 键 词：水位下降 结构性土 地面沉降 承压层 非线性固结 

分 类 号：TU447[建筑科学—岩土工程] TU433[建筑科学—土工工程]