砂土突涌诱发土体沉降的沉降范围预测模型  

Prediction Model of Ground Subsidence Induced by Sand Intrusion

作　　者：吴吟 张向向 张翔 WU Yin;ZHANG Xiangxiang;ZHANG Xiang(College of Environment and Resources,Fuzhou University,Fuzhou 350116;Engineering Research Center of Geological Engineering,Fuzhou University,Fuzhou 350116)

机构地区：[1]福州大学环境与资源学院,福州350116 [2]福州大学地质工程福建省高校工程研究中心,福州350116

出　　处：《土工基础》2022年第3期391-394,399,共5页Soil Engineering and Foundation

基　　金：福建省教育厅中青年教师教育科研项目(JAT190052);福州大学开放测试基金(2020T007);福州大学科研启动基金(GXRC-20006)。

摘　　要：基于砂土在水力作用下发生突涌并诱发沉降形成漏斗状沉降坑的模式,提出相应的沉降范围预测模型,推导沉降坑半径及中心深度的表达式,以预测砂土发生沉降的沉降范围及沉降量。按照预测模型涉及的影响因素,通过模型试验从土体细颗粒含量、水力比降、涌口直径三个方面对预测模型进行合理性验证。结果表明,砂土发生突涌后形成的沉降坑近似漏斗状,沉降坑半径及中心深度的预测值和实测值的平均相对误差分别为5.6%、7.4%,模型能较准确地预测沉降范围;根据模型预测出的土体细颗粒含量、水力比降、涌口直径对砂土诱发沉降的影响规律与试验结果基本一致。Under the hydraulic action,the saturated sand intrusion might occur and then induce the ground subsidence to form a funnel-shaped depression zone.This paper proposes a prediction model of sandy soil subsidence range,and the expressions of the settlement radius and depth at the center of the subsidence are presented.This formula can directly predict the range and volume of subsidence.The potential influencing factors involved in the expression are evaluated through the model tests from the fine grain content,hydraulic gradient,and diameter of the sand intrusion zone.The results show that the subsidence zone formed after the intrusion is approximately funnel-shaped,and the average of the relative errors between predicted values and measured values of subsidence radius and depression center depth are 5.6% and 7.4%,respectively.The proposed model can predict settlement range accurately.According to the predictive model,the influence of the soil fine grain content,hydraulic gradient,and the diameter of the sand intrusion zone on the ground subsidence induced by sand is consistent with the laboratory test results.

关 键 词：砂土 沉降范围预测 细颗粒含量 水力比降 涌口直径 

分 类 号：TU433[建筑科学—岩土工程]