施工对土体扰动及其检测技术研究进展

Advances in Research on Construction Disturbance to Soil and Related Testing Techniques

运用于土体遭受地下工程施工扰动评价的常用指标主要有:孔隙水压力、不排水模量、孔隙比、应力路径、应变以及各种模量等,不同指标或指标之间的组合,构成了实际评价中常用的单因子与多因子评价方法。静力触探、BOTDR和TDR等原位检测技术,具有试验精度高、可靠性好等优点。由于建筑环境对施工扰动的敏感度与控制要求的不断提高,施工扰动评价指标体系、特别是微扰动控制指标体系研究;以及原位检测技术和室内试验相结合、更为精准地评价土体受施工微扰动的定量检测手段研究等,都将是今后一段时间施工扰动及其检测技术研究的工作方向。

Recently, the common indexes employed for evaluating soil disturbance during underground construction include pore water pressure, undrained modulus, pore ratio, stress path, strain, various moduli, and so forth. According to these indexes or their combinations, all the evaluating methods commonly used can be classified into single-factor or multi-factor evaluation techniques. However, the in-situ testing technologies, such as CPT, BOTDR and TDR, are highly accurate and reliable. With the increasing environmental protection requirements to the construction disturbance, studies of construction disturbance evaluation index system for evaluating slight construction disturbance, as well as the combination of in-situ tests and lab tests for the more accuracy and quantitative evaluation techniques for the test of slight construction disturbance to soil, are important work to be carried out in the future.