摘要
为了研究川东天台乡滑坡滑带土的蠕变特性和长期强度,首先对滑带土进行了三轴固结排水蠕变试验,得到了不同围压、不同应力加载等级下的全过程蠕变曲线,并采用"陈氏加载法"得到分别加载的蠕变曲线;然后根据蠕变试验结果,建立了反映滑带土蠕变特性的Singh-Mitchell蠕变模型,并对该模型进行了参数辨识,结果表明Singh-Mitchell模型能够很好地模拟该滑带土的蠕变特征;最后利用应力-应变等时曲线得到了滑带土的长期强度参数为c=23.6kPa、=9.7°。该研究结果为进一步研究天台乡滑坡变形规律、滑坡治理和滑坡中长期预报提供了依据。
For the purpose of studying the creep characteristics and long-term strength of the slip zone soil of Tiantaixiang landslide in east Siehuan, the consolidated drained triaxial creep tests are carried out. The full-process creep curves under different confining pressures and multi-grade loads are obtained. Furthermore, the creep curves of multi-step constant load are gained by using ＂Chen method＂. According to the resulcs of creep test, Singh-Mitehell creep model which can reflect the creep behaviors of slip zone soil is established,and parameters of Singh-Mitchell creep model are recognized. Compared with the data of the tests, the creep model suggested is thought to be suitable in the simulation capability for creep behaviors of soils in the slip zone. Finally, long-term strength of slip soil is obtained by using stress-strain equal-time curve,c=23.6kPa, Ф= 9.7°, to provide dependable test evidence for further research on the deformation rules, landslide treatment and medium-term and long-term forecasting.
出处
《安全与环境工程》
CAS
2010年第4期105-110,共6页
Safety and Environmental Engineering
基金
国家自然科学基金项目(No.40672187
No.40972184)
