论文部分内容阅读
在深基坑工程事故中,地基土既是结构变形导致事故的重要载体,又是事故的直接承受体。作为应急抢险常用的注浆方法,其工程效果主要取决于对土层变形的了解程度及浆液的影响范围和固结程度。因此,查明土体变形是预防和治理深基坑工程事故的前提,检测浆液分布则是确保应急处理质量和进一步采取补救措施的手段与依据。本文以某办公大楼和某酒店深基坑工程的土层变形及止水加固压密注浆的雷达探测为例,阐述了探地雷达原理、技术特点及工作方法。两个工程实例表明,作为一种快速实用的无损检测技术,雷达探测结果可用于指导应急注浆工程的实施,特别是某酒店深基坑工程中,以浆液分布情况的雷达探测结果为依据进行补救注浆达到了较好的止水目的。
In the deep foundation pit engineering accident, the foundation soil is not only the important carrier of the accident caused by structural deformation, but also the immediate acceptor of the accident. As a common emergency grouting method, the engineering effect depends mainly on the degree of understanding of the soil deformation and slurry influence scope and degree of consolidation. Therefore, to find out the deformation of soil is the prerequisite to prevent and control the deep foundation pit engineering accident. Testing the slurry distribution is the means and basis to ensure the quality of emergency treatment and further remedial measures. In this paper, taking the deformation of a soil layer of a deep-foundation pit project of a certain office building and a hotel as an example, this paper illustrates the principle, technical characteristics and working methods of ground penetrating radar. Two engineering examples show that, as a fast and practical non-destructive testing technique, the results of radar detection can be used to guide the implementation of emergency grouting projects. In particular, in the deep excavation project of a hotel, the radar detection results of slurry distribution are taken as a basis Remedy grouting to achieve a better stop water purposes.