摘要
在南方丘陵区工程建设的场地整平时,常形成一些人工堆填岗地,受到下覆黏性土的阻隔,岗地上的填土会形成独立的上层滞水地下水系统,但目前对于这个地下水系统的特征及其工程危害却鲜有研究。本文利用某人工堆填岗地导致地下室破坏的上层滞水水位监测资料,研究了该地下水系统的水位动态和流场及其变化特征,分析了水位和流场及其变化的影响因素。研究结果表明:堆填岗地上的集、排水工程易遭受填土不均匀沉降的破坏而出现渗漏;堆填岗地上的上层滞水虽属于“路过”型地下水,但系统的抗干扰能力弱,在汇集的雨水集中灌入时,因排泄相对缓慢,水位上升迅速,滞留时间较长,由此对地下工程造成破坏,因此工程建设时需引起重视。考虑到集、排水工程渗漏对上层滞水水位的影响,地下工程的抗浮水位应在考虑岗地的地下水水位的动态变化特征的基础上,以集、排水工程的埋深及可排泄标高为依据。本地下工程事故可用调整场地规划、封堵或重建渗漏集排水结构、盲沟疏排与拉锚结构的防治结合方式处理。
In the southern hilly area,artificial hillocks are often formed during site leveling.These hillocks are often blocked by cohesive soil,and the fill on top of them forms an independent groundwater system of perched water.However,there have been few studies on the characteristics of this groundwater system and its potential harm to engineering.In this paper,we study the water level dynamics and variation characteristics of the groundwater system by using monitoring data of perched water causing destruction to the basement.We also analyze the factors that influence the variation of the water level and flow field.The results show that the catchment and drainage works on the accumulated hillock are prone to leakage due to the uneven settlement of the fill.Although the perched water on the accumulated hillock belongs to the"passing"type of groundwater,the groundwater system has weak anti-interference capability.When the collected rainwater is concentrated in the irrigation,the drainage is relatively slow,the water level rises rapidly,and the retention time is long,which can cause damage to underground engineering.Therefore,attention should be paid to the construction of the project.Considering the influence of leakage of catchment and drainage works on the water level of perched water,the anti-floating water level of underground engineering should be based on the dynamic variation characteristics of the groundwater level in the ground,as well as the burial depth and drainage elevation of catchment and drainage works.Engineering accidents of this kind can be treated by adjusting site planning,plugging or rebuilding the catchment,drainage structure,blind ditch drainage and pull anchor.
作者
罗照华
罗翰
LUO Zhaohua;LUO Han(Hunan Hydrogeology Environmental Geological Survey and Monitoring Institute,Changsha,Hunan 410100;ExplorationInstitute of Geological Engineering of Hunan Province Co.LTD,Zhuzhou,Hunan 412003)
出处
《地质与勘探》
CAS
CSCD
北大核心
2023年第2期387-397,共11页
Geology and Exploration
关键词
人工堆填岗地
地下水水位动态
流场特征
地下工程抗浮
artificial hillocks
groundwater level dynamics
flow field characteristics
anti-floating of underground works
