| 重塑硅藻土抗剪强度的环剪试验研究 |
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| 引用本文： | 郭长宝,张永双,孟庆伟,郑光,李海华.重塑硅藻土抗剪强度的环剪试验研究[J].岩土力学,2013,34(1):109-114. |
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| 作者姓名： | 郭长宝 张永双 孟庆伟 郑光 李海华 |
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| 作者单位： | 1. 中国地质科学院 地质力学研究所，北京 100081；2. 国土资源部新构造运动与地质灾害重点实验室，北京 100081； 3. 地质灾害防治与地质环境保护国家重点实验室，成都 610500；4. 中国地质科学院，北京 100037 |
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| 基金项目： | 地质力学研究所基本科研业务费项目(No. DZLXJK201206)；地质灾害防治与地质环境保护国家重点实验室开放基金项目(No. SKLGP2010K015)；国家自然科学基金项目(No. 41072269)；国家科技支撑计划课题(No. 2011BAK12B09) |
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| 摘 要： | 硅藻土是一种强结构性土，具有密度小、孔隙大、干燥土块吸水率高等特点。天然硅藻土的抗剪强度大，但在外界扰动或风化后，结构性强度丧失，易发生滑坡等斜坡变形破坏现象，因此，研究其在大变形下的力学性质很有必要。利用环剪仪可以研究土体在较大剪切位移条件下抗剪强度变化规律，对重塑硅藻土进行环剪试验研究，得到了不同竖向压力下的应力-位移曲线，认为重塑硅藻土为典型的应变软化型土；根据测试结果得到了重塑硅藻土的抗剪强度和残余强度，并从物质组成和微观结构特征方面对重塑硅藻土的力学性质进行了分析，为硅藻土滑坡的成因分析和灾害防治提供了依据。
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| 关 键 词： | 重塑硅藻土 环剪试验 抗剪强度 滑坡 残余强度 |
| 收稿时间： | 2011-10-28 |
Research on shear strength of remolding diatomite by ring shear tests |
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| GUO Chang-bao,ZHANG Yong-shuang,MENG Qing-wei,ZHENG Guang,LI Hai-hua.Research on shear strength of remolding diatomite by ring shear tests[J].Rock and Soil Mechanics,2013,34(1):109-114. |
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| Authors: | GUO Chang-bao ZHANG Yong-shuang MENG Qing-wei ZHENG Guang LI Hai-hua |
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| Institution: | 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081; 2. Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resources, Beijing 100081, China; 3. State Key Laboratory of Geological Hazard Prevention & Geological Environment Protection, Chengdu 610500, China; 4. Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | The diatomite is a kind of strong structural soil, which has small density, large porosity, and high water absorption rates of dry rock. The shear strength of natural diatomite is large, but the structural strength lost occurs when the diatomite is disturbed by the external disturbance or weathering; so the diatomite slope is easily destroyed in the performance of landslide; thus to study the mechanical properties under large deformation is necessary. Using the characteristics of ring shear apparatus can study soil shear strength variation in a larger shear displacement conditions. this paper makes ring shear strength test study of the remolding diatomite, to obtain the stress displacement curves under different vertical pressures, which indicate that the remolding diatomite is of typical strain softening. According to the ring shear test results the remolding diatomite’s, shear strength and residual strength are obtained, and the soil mechanical properties are analyzed from the material composition and microstructure characteristics of the remolding diatomite, so as to provide reasonable parameters for diatomite landslide analysis and disaster prevention and control. |
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| Keywords: | remolding diatomite ring shear test shear strength landslide residual strength |
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