真空预压法地下水位分析及其测试方法  

Analysis and test method for groundwater level by vacuum preloading

作　　者：高志义[1,2,3] 侯晋芳[1,2,3] 梁爱华 

机构地区：[1]中交天津港湾工程研究院有限公司,天津300222 [2]港口岩土工程技术交通行业重点试验室,天津300222 [3]天津市港口岩土工程技术重点试验室,天津300222

出　　处：《岩土工程学报》2013年第S2期684-688,共5页Chinese Journal of Geotechnical Engineering

摘　　要：建议以静水压力为零的线定义为地下水位线;分析了地下水位测试中的6个影响因素;提出了地下水位降低与升高的必要与充分条件;通过对真空预压机理与力系的分析,地下水位变化的必要与充分条件检验,膜下双管式测试仪现场实测地下水位结果,加固后土体仍为饱和土的事实和实测资料并无降水预压迹象,5个方面证明真空预压时地下水位是不变的;还提出一种棒式真空预压地下水位测试仪。它消除了膜下双管法局部真空度与实际不符及内管漏气对测试的影响。可真实地测出地下水位。It is suggested that the zero hydrostatic pressure level(or plane) should be defined as the groundwater level(or plane). Six factors for the groundwater measurement are analyzed. At the same time, the necessary and sufficient conditions for the decrease and increase of groundwater level are also shown. By analyzing the vacuum preloading mechanism and system of forces, necessary and sufficient conditions for change of groundwater level and field test results of groundwater level, the fact of the soils that are still saturated after improvement, and field data indicate that there are no lowering of the groundwater and preloading. It is illuminated that the groundwater level does not owing to ground improvement by vacuum preloading. A new type of rod instrument is put forward to measure the groundwater level. It is a direct method to measure the groundwater level, which eliminates the effects of incorrect vacuum degree and internal tube leaking as measured by means of the double pipe method. So this new instrument is reliable to measure the groundwater level.

关 键 词：地下水位 监测 测试仪器 真空预压 

分 类 号：TU472.33[建筑科学—结构工程]