花花岩组滑坡堆积体蠕变特性研究
Study on Creep Characteristics of Huahuayanzu Landslide Deposits
董金玉 1景茂 1赵亚文1
作者信息
- 1. 华北水利水电大学 地球科学与工程学院,河南 郑州 450046
- 折叠
摘要
花花岩组滑坡是一种堆积体滑坡,其滑体由松散的土石堆积体组成,在滑坡缓慢变形中具有明显的蠕动特点.为研究该滑坡堆积体的蠕变特性,确定滑坡堆积体的长期强度指标,对滑坡堆积体进行了直剪蠕变试验.试验结果表明:滑坡堆积体在直剪蠕变试验中表现出明显的减速蠕变和稳态蠕变特征,在较大水平荷载作用下会进入加速蠕变状态;采用 Burgers模型以及改进后的 Burgers 模型对蠕变曲线进行拟合,其结果表明,改进的 Burgers模型对非线性的加速蠕变过程拟合效果更好,拟合曲线更接近实际蠕变曲线;通过过渡蠕变法确定了滑坡堆积体的长期强度范围,滑坡堆积体的长期强度为其瞬时抗剪强度的 39%～59%.
Abstract
The Huahuayanzu landslide is an accumulation landslide.The slide body of this landslide consists of loose soil and rock accumulations.It has obvious creep characteristics in the slow deformation of the landslide.To study the creep characteristics of the landslide deposit and determine its long-term strength index,direct shear creep tests were conducted on the landslide deposit.The results are as follows.The landslide accumulation exhibits obvious deceleration creep and steady-state creep characteristics in direct shear creep tests.Under larger horizontal loads,it will enter an accelerated creep state.The creep curve was fitted by Burgers model and improved Burgers model.The results show that the improved Bur-gers model can better fit the nonlinear accelerated creep process,and the fitting curve is closer to the actual creep curve.The long-term strength range of landslide deposits is determined by the transition creep method.The long-term strength of landslide deposits is 39%to 59%of its instantaneous shear strength.
关键词
花花岩组/堆积体滑坡/堆积体/蠕变模型/长期强度Key words
Huahuayanzu landslide/accumulated landslide/accumulated deposits/creep model/long-term strength引用本文复制引用
基金项目
国家自然科学基金(U1704243)
国家自然科学基金(41741019)
河南省科技攻关计划(192102310006)
出版年
2024
国家科技期刊平台
NSTL
万方数据