扁铲侧胀仪的改进及应用  

Improvement and application of flat dilatometer

作　　者：刘学彦[1,2] 朱定华[3] 袁大军[1,2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京交通大学隧道及地下工程教育部工程研究中心,北京100044 [3]南京工业大学岩土工程研究所,江苏南京210009

出　　处：《岩土工程学报》2013年第7期1375-1380,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50878015;51178027)

摘　　要：由于具有对土体扰动小、试验点连续、能较好地反映原位土的力学性质等优点,扁铲侧胀试验被越来越广泛应用于实际工程。但是,在扁铲侧胀试验测定过程中,加压速率等因素对试验结果有一定影响,这些因素对试验结果影响程度多大,测试结果误差如何衡量和修正却无从给出,而且扁铲侧胀试验不能直接测定孔隙水压力。为此,添加微型位移传感器和孔压传感器,对传统扁铲侧胀仪进行改进,成为孔压位移扁铲侧胀仪(pore pressure and displacement flat dilatometer)。使得扁铲试验具有自校准功能并兼备孔压测定功能。介绍了孔压位移扁铲侧胀试验的原理、过程和方法,并分析了孔压位移扁铲侧胀试验与传统扁铲侧胀试验的异同。通过与传统扁铲的对比试验得出,孔压位移扁铲侧胀试验测试结果更加稳定、准确,并首次在纬三路试验场地通过孔压位移扁铲侧胀试验确定了原位静止土压力,进行了成功应用。With the advantages of little soil disturbance,good continuity of the test data and good prediction of mechanical properties of in-situ soil,flat dilatometer tests have been used in more and more projects.But the rate of pressurization and other factors bring errors to the test results in flat dilatometer tests,and it’s difficult to evaluate the error and give the emendatory results.The pore water pressure cannot be measured directly by the flat dilatometer tests.Thus,the micro-displacement and pore pressure senors are installed on the flat dilatometer to make it change into the pore pressure and displacement flat dilatometer.It can regulate the results by itself and measure pore pressure directly.The principle,method and procedure of the pore pressure and displacement flat dilatometer tests are introduced.The differences between the pore pressure and displacement flat dilatometer tests and the flat dilatometer tests are also given.The results measured in the pore pressure and displacement flat dilatometer tests are more accurate and stable by comparing with these of the flat dilatometer tests.The in-situ lateral earth pressures in the test field of Weisan Road are measured in the pore pressure and displacement flat dilatometer tests for the first application.

关 键 词：孔压位移扁铲侧胀仪 自校准 孔隙水压力 对比试验 原位静止土压力 

分 类 号：TU415[建筑科学—岩土工程]