蒲成志, 贺桂成, 朱忠华. 2019: 含软弱夹层板岩抗剪强度试验及表征方法. 工程地质学报, 27(3): 525-531. DOI: 10.13544/j.cnki.jeg.2018-219
    引用本文: 蒲成志, 贺桂成, 朱忠华. 2019: 含软弱夹层板岩抗剪强度试验及表征方法. 工程地质学报, 27(3): 525-531. DOI: 10.13544/j.cnki.jeg.2018-219
    PU Chengzhi, HE Guicheng, ZHU Zhonghua. 2019: TEST AND CHARACTERIZATION METHOD FOR SHEAR STRENGTH OF SLATE CONTAINING WEAK INTERCALATED LAYER. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 525-531. DOI: 10.13544/j.cnki.jeg.2018-219
    Citation: PU Chengzhi, HE Guicheng, ZHU Zhonghua. 2019: TEST AND CHARACTERIZATION METHOD FOR SHEAR STRENGTH OF SLATE CONTAINING WEAK INTERCALATED LAYER. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 525-531. DOI: 10.13544/j.cnki.jeg.2018-219

    含软弱夹层板岩抗剪强度试验及表征方法

    TEST AND CHARACTERIZATION METHOD FOR SHEAR STRENGTH OF SLATE CONTAINING WEAK INTERCALATED LAYER

    • 摘要: 在微机控制岩石剪切试验机上,针对预裂的含薄层黏土充填结构面板岩试件,进行不同法向应力下的结构面直剪试验,发现:结构面直剪试验中,并不是整个结构面都参与抗剪工作,只有部分结构面发挥抗剪作用,而且发挥抗剪作用的有效摩擦面积随法向应力的增大而增大,但是增大速率逐渐减小。基于整个结构面发挥抗剪作用的假设,获得了结构面表观剪应力-剪位移关系曲线,拟合计算了结构面表观抗剪强度指标;同时基于每次直剪试验中结构面部分区域发挥抗剪作用的假设,获得了结构面有效剪应力-剪位移关系曲线,拟合计算了结构面有效抗剪强度指标。对比两者发现:结构面抗剪强度指标中,内摩擦角与发挥抗剪作用面积的选取无关,黏聚力则受发挥抗剪作用面积选取的影响;基于结构面有效摩擦面积计算得到的有效黏聚力,相比表观黏聚力,提高了95%。本文研究成果对于滑坡工程治理方案的评估与选择具有重要的意义和价值。

       

      Abstract: Direct shearing tests of pre-split structural plane filled with clay films are conducted on the slate specimens using a microprocessor servo-controlled shearing tester under various normal stresses. After that, two experimental phenomena are found as follows. (1)During the process of direct shearing test of structural plane, the areas which bored the shearing force were not the whole structural plane, but were partial structural plane. (2)The values of effective frictional areas which bored the shearing force during every shearing process, could increase with the increasing of normal stress, but the increasing rate decreased gradually. In this paper, to analyze the changing law of shear strength parameters of filled structural plane, the apparent shear strength parameters and effective shear strength parameters were proposed. The apparent shear strength parameters were calculated according to the assumption that the shearing force was borne by the whole structural plane. And then, curves of relation between apparent shear stress and shear displacement were obtained. And apparent shear strength parameters were achieved by fitting the apparent shear stresses under various apparent normal stresses. The effective shear strength parameters were calculated according to the assumption of effective frictional areas. In the same way, the curves of relation between the effective shear stress and the shear displacement, and effective shear strength parameters were obtained. Comparing the apparent shear strength parameters with effective shear strength parameters, we find that:(1)the frictional angle has no relationship with the choice of structural plane which bears the shearing force. But the cohesion is influenced by the choice of structural plane. (2)Comparing with the apparent cohesion, the value of effective cohesion is improved by 95%. This paper may contribute to the assessment and selection of the treatment plan of landslide engineering.

       

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