负压环境下新型地下水位测试装置研发

发布时间：2018-04-10 13:02

本文选题：真空预压法 + 激光测试法　；参考：《岩土力学》2017年10期

【摘要】：现行负压环境下的地下水位测试方法均不能正确反映真空预压条件下地基中的地下水位变化情况。鉴于此,先深入分析了现行负压环境下地下水位测试方法的局限性,然后详细地介绍了一种负压环境下新型地下水位测试技术,即闭口测压管法-激光测试法,最后依托实际工程进行了现场试验研究并验证了其合理性。研究结果表明:现行闭口测压管测试法均存在一定的局限性,主要体现在两方面:(1)测试装置均非常复杂,不便于现场安装埋设;(2)测试结果的影响因素较多,测试结果均不能代表真空预压条件下地基土体中地下水位的真实值。文中提出的新型测试技术,即闭口测压管测试法-激光测试法是基于激光测距原理进行测试的,其方法简便、成本低、结果直观。现场试验结果表明:真空预压条件下,地基中的地下水位总体上随地基的沉降而下降,且总的下降幅度稍大于真空预压期间地基的固结沉降值;激光测试法能正确反映真空预压条件下地基中的地下水位变化情况,有助于对真空预压加固效果进行正确评价和分析。
[Abstract]:The underground water level under negative pressure test method can not reflect the change of groundwater level in soil under vacuum preloading. In view of this, the first in-depth analysis of the limitations of the existing underground water level under negative pressure test method, then detailed introduction of a new type of underground water level under negative pressure testing technology, namely closed laser test method of piezometric tube method, finally through field tests and verifies its rationality based on the actual engineering. The results show that: the current closed piezometer test method have certain limitations, mainly reflected in two aspects: (1) the test devices are very complex, not easy on-site installation; (2) more factors affecting the test results, the test results are not representative of groundwater level of foundation soil under vacuum preloading in true value. Test new technology is introduced in this paper, the closed pressure tube test Method and laser testing method is tested based on the principle of laser ranging, the method is simple, low cost, intuitive results. Field test results indicate that under vacuum preloading, the underground water level in foundation with the overall settlement decreased, and the total decline is slightly larger than the vacuum pre consolidation period of foundation settlement value the pressure; laser test method can correctly reflect the changes of groundwater level in soil under vacuum preloading, contribute to the strengthening effect in vacuum preloading the correct evaluation and analysis.

【作者单位】：中交四航工程研究院有限公司;中交交通基础工程环保与安全重点实验室;南京水利科学研究院;
【分类号】：TU46;TU472.33

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