某深基坑工程勘察中地下水的影响评价

Evaluation on the Groundwater Influence to the Deep Foundation Pit Engineering Investigation

随着城市建设规模的不断扩大,城市建设空间变得越来越狭窄,建(构)筑物越来越多的向高空和地下空间扩展,深基坑问题越来越突出。在水文地质条件复杂地区进行深基坑工程勘察时,须对地下水开展专项研究,评价其对基坑工程的影响。在高水位地区进行深基坑工程勘察,除评价边坡的稳定性外,还应重点分析评价坑底抗隆起稳定性。本文以太原市某高层建筑深基坑勘察工程为例,采用多种勘探手段查清了场地地下水的赋存条件;通过单井抽水试验,运用Aquifer test软件对场地内主要含水层水文地质参数进行计算;结合基坑支护体系,评价了地下水对基坑工程的影响,提出了相关工程处理措施建议。其工作方法、手段及评价内容可为类似工程借鉴。

With the expansion of the scale of urban construction, urban space is becoming more and more narrow, building structures more and more into the sky and underground space to expand, and the problem of deep foundation pit is more and more prominent. In the complicated hydrogeological condition area for deep foundation pit engineering investigation, it needs carrying out special study on groundwater, evaluation of its influence on excavation engineering. In high water area for deep foundation pit engineering investigation, in addition to the evaluation of slope stability, also it should focus on analysis and evaluation on resistance to uplift stability of bottom. This paper based on a deep foundation pit engineering investigation in a high-rise building of Taiyuan as an example, uses a variety of exploration methods to investigate the occurrence conditions of groundwater. To carry out the single well pumping test, we use the Aquifer test software within the venue on the main aquifer hydrogeological parameters to calculate. Combining with the foundation pit supporting system, evaluation of the groundwater influence on excavation engineering, this paper puts forward some proposals concerning the engineering treatment measures. Its working methods, evaluation means and evaluation contents can be reference to similar projects.