强震后大型崩滑土体力学性状及其灾变机理研究

After the Wenchuan earthquake, a large number of large sliding masses Gravelly soil triggered by the earthquake is widely distributed. They has changed as the debris flow repeatedly in rainfall.Wenjiagou is a most typical example, 9.24.2008 debris flow formed 5-20 m deep channel in landslide debris flow deposition area, and after 8.13 2010 the right side of the gully (ditch) further deep to 40 ~ 60m.Mechanical Behavior of the slump-gravel soil triggered by the earthquake, especially in the mechanical response of the various external role is important for the reveal of the Debris Flow mechanism.This project is the wenjiagou slump-gravel soil triggered by the earthquake for the object, on collecting data, on the basis of field investigation,we intend to made a new large direct shear apparatus,and using large Triaxial tester to study multi-function instrument of Rock and Soil Mechanics instrument a number of different moisture content, different gradation sample test, and intends to use the critical soil mechanics theory, a more systematic study of the static of liquefied theory and catastrophe theory, the mechanical property characteristics, analysis of test results and the internal relations of the debris flow phenomena.And intends to further interior design physical simulation and numerical simulation of debris flow starting process and mechanism .

汶川大地震后,强震引发的大量大型崩滑土体广泛分布,在降雨作用下已发生多次泥石流。文家沟最为典型,2008年9.24泥石流在滑坡碎屑流堆积区形成深5-20米的沟道，2010年8.13后右侧冲沟（主沟）进一步深切到40～60m。强震引发的崩滑砾石土的力学性状，特别是在各种外部作用下的力学响应对于揭示泥石流起动机制有重要意义。本项目拟以震后文家沟物源区的崩滑砾石土为研究对象，在资料收集、现场调查的基础上，有针对性地研制的大型叠环直剪仪、并运用大型三轴试验仪、岩土力学多功能仪等仪器进行大量不同含水率、不同级配试样的试验，并拟运用临界土力学理论、液化理论和突变理论对其力学性状特征进行较为系统的分析，研究试验结果与泥石流现象的内在联系。并拟通过室内设计物理模拟和数值模拟试验进一步进行泥石流起动过程和机理研究。

汶川大地震后,强震引发的大量大型崩滑土体广泛分布,在降雨作用下已发生多次泥石流，其中以文家沟最为典型。课题组以震后文家沟的崩滑堆积体砾石土为研究对象，在资料收集、现场调查的基础上，总结和阐述了文家沟泥石流形成的条件和过程以及强震后崩滑砾石土的特征,有针对性地研制了大型粗粒土叠环直剪仪进行试验、并运用粗粒土大型三轴试验仪进行不同含水、不同级配试样强度试验研究。针对文家沟崩滑堆积土体物理力学特性，利用水槽模拟试验，再现泥石流起动全过程。通过分析颗粒级配、含水条件、细粒含量等崩滑堆积体砾石土的内在因素和降雨地表径流、坡度等外部影响因素，探讨了强震后崩滑堆积体在各种外部作用下发生破坏，转化泥石流的起动方式、形成过程。