膨胀土(岩)渠坡现场监测技术研究

摘要

膨胀岩(土)是一种在自然地质过程中形成的多裂隙性、胀缩性地质体,其黏粒成分具有强亲水性,导致膨胀岩(土)体反复变形、裂隙发育,对渠道工程具有严重破坏作用.因此,合理的监测系统、监测仪器选型及埋设技术,将直接影响膨胀岩(土)渠坡监测成果的真实性和有效性.根据南水北调中线一期工程南阳、新乡膨胀土、岩试验段现场工作成果,从监测项目、系统组成、仪器布置、仪器选型、埋设技术等方面,系统地总结了膨胀土(岩)渠坡监测技术和实践经验.%Swelling rock (soil) is a kind of geological body which possesses multi-crack, swell-shrinkage property and strong hydrophilic characteristics, and results in the swelling rock (soil) body' s repeated deform and fracture development. So the serious damage will occur in the channel project. Therefore, a reasonable monitoring system, monitoring equipment selection and built-in techniques, will directly affect the swelling rock (soil) authenticity and validity of monitoring results in the channel slope. On the basis of the monitoring results obtained from Nanyang and Xinxiang swelling rock (soil) field test section of the first phase of the Middle Route of South-to-North Water Transfer Project, this article studied and concluded the following three aspects; the composition of the monitoring system, the monitoring items,equipment layout position; monitoring instrument models, the basic principle, accuracy requirements; equipment requirements and laying technology research.