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滑带是影响滑坡稳定的最关键内在因素之一。对原状土进行X射线衍射、压汞试验,获得了滑带土体的成分及其含量和孔隙结构参数,结果表明,滑带土成分以石英、拉长石、伊利石等为主,孔隙孔径以小孔和过渡孔居多;依据工程实例滑坡滑带土所处的水化学环境,模拟不同水化条件,通过剪切试验、渗透试验和扫描电镜试验,获得不同化学条件的强度和渗透性参数及微细观结构特征,分析了滑带土在不同水化学条件下力学特性和渗透性变化规律。试验结果表明:相同p H条件下,较之蒸馏水,土样经化学溶液浸泡后峰值强度和残余强度变大,且残余强度的变化更明显;不同p H条件下,酸碱性溶液使得土的强度参数显著降低。该研究结果为水化学条件下滑坡滑带土力学特性变化、多场耦合理论模型分析提供了重要的基础数据。
Sliding belt is one of the most crucial internal factors affecting the stability of landslides. X-ray diffraction and mercury intrusion test were carried out on the undisturbed soils. The composition, contents and pore structure parameters of the soils were obtained. The results show that the main components of the sliding lands are quartz, labradorite and illite, And the pores and transitional holes are the most. Based on the water chemistry environment of landslide slide soil in engineering practice, different hydration conditions are simulated and the strength and permeability parameters under different chemical conditions are obtained through shear test, penetration test and scanning electron microscope test And microstructure characteristics of the sliding zone soil in different chemical and mechanical properties under water permeability changes. The experimental results show that the peak strength and the residual strength of soil samples after immersion in chemical solution become larger than that of distilled water under the same conditions of p H, and the changes of residual strength become more obvious. Under different pH conditions, The intensity parameter is significantly reduced. The results of this study provide important basic data for the change of mechanical properties of landslide landslide under water chemistry conditions and the analysis of multi-field coupling theory models.