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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。
Under the current negative pressure environment, groundwater level test methods can not correctly reflect the groundwater level changes in the foundation under vacuum preloading conditions. In view of this, firstly, the limitations of the current groundwater level test method under negative pressure environment are analyzed in depth. Then a new test technique of groundwater level under negative pressure environment is introduced, that is, closed-end piezometer method-laser test method, The actual project conducted a field test and verified its rationality. The results show that the existing closed piezometer test methods have some limitations, mainly in two aspects: (1) the test devices are very complex and inconvenient for site installation; (2) there are many influencing factors in the test results, The test results can not represent the true value of groundwater level in foundation soil under vacuum preloading conditions. The new test technique proposed in this article, that is, the closed-end piezometer test method - the laser test method is based on the principle of laser ranging to test, the method is simple, low cost, the results are intuitive. The field test results show that under the condition of vacuum preloading, the groundwater table in the foundation generally declines with the settlement of the foundation, and the total decrease amplitude is slightly larger than the consolidation settlement value of the foundation during vacuum preloading. The laser test method can correctly reflect the vacuum Under the condition of preloading, the change of groundwater level in foundation can help to correctly evaluate and analyze the effect of vacuum preloading.