《Canadian Geotechnical Journal》刊登“老粘土堤坝的季节性边坡移动”

作者：Lees, A.S.，MacDonald, G.J.，Sheerman-Chase, A.，Schmidt, F.

刊物：《Canadian Geotechnical Journal》，2013年8月，第50卷第5期，503-520页

关键词： 拦河坝和水库，大坝，堤坝，现场试验和监测

摘要：通过对Aldenham堤坝的下部边坡进行了十年的监测数据发现了一个奇怪的现象，即夏季粘土堤坝较低边坡在生长有树木的地方的下部边坡具有明显移动的现象。本文对四个监测坡段的数据进行了分析，其中在两个土壤高缺水条件下观测到了下部边坡的移动，这种高缺水条件和干燥条件是由下部边坡植被生长造成的，在允许长草的上部边坡存在较低的土壤缺水现象，直到在其自重下滑到了下部。这一现象造成典型的结构机制，即堰顶沉降的合理累积，其表现为对基础堤坝和大坝的连续适应。随后通过有限元程序对这一典型结构机制进行了定性的数值模拟。在第三个监测段，稀疏分布着低需水量的树，低塑性粘土和含水率接近或低于塑限造成了边坡的显著移动。在第四个高度较低的监测段，观察到下部边坡移动有一缓慢积累和拉裂现象。

Seasonal slope movements in old clay fill embankment dam

Authors：Lees, A.S.，MacDonald, G.J.，Sheerman-Chase, A.，Schmidt, F.

Journal：Canadian Geotechnical Journal. Aug2013, Vol. 50 Issue 5, p503-520.

Key Word：barrages and reservoirs，dams，embankments，field testing and monitoring

Abstract：A curious phenomenon of significant summertime down slope movements, observed at other sites where trees grow on the lower slope of clay fill embankments, has been recorded during 10 years of downstream slope monitoring at Alden ham embankment dam, UK. The data from four monitored sections of the slope are described. At two locations, down slope movements were observed in high soil moisture deficit (SMD) conditions, where it appeared that high SMD and shrinkage caused by trees growing on the lower slope allowed the grassed upper slope with lower SMD to slip downwards under its own weight. This led to a seasonal, ratcheting accumulation of crest settlement - a type of mechanism that presents a continual serviceability problem to infrastructure embankments as well as dams. This mechanism was simulated in a qualitative way by finite difference analysis. At a third monitored section, a sparser distribution of lower water-demand trees, lower plasticity clay fill, and moisture content close to or below the plastic limit appeared to result in insignificant slope movements. At a fourth low-height monitored section, a slow accumulation of down slope movements, as well as tension cracking was observed.

原文链接：https://vpn2.nlc.gov.cn/prx/000/http/web.ebscohost.com/ehost/detail?vid=8&sid=741ae87e-b79a-4d71-b1af-ff81241cc94c%40sessionmgr15&hid=23&bdata=Jmxhbmc9emgtY24mc2l0ZT1laG9zdC1saXZl#db=a9h&AN=87584788