التفاصيل البيبلوغرافية
| العنوان: |
四川茂县周场坪深层滑坡滑带土环剪试验强度研究. (Chinese) |
| Alternate Title: |
STUDY ON SHEAR STRENGTH OF DEEP-SEATED SLIDING ZONE SOIL OF ZHOUCHANGPING LANDSLIDE IN MAOXIAN, SICHUAN. (English) |
| المؤلفون: |
张怡颖, 郭长宝, 杨志华, 沈亚麒, 吴瑞安, 任三绍 |
| المصدر: |
Journal of Engineering Geology / Gongcheng Dizhi Xuebao; 2021, Vol. 29 Issue 3, p764-776, 13p |
| Abstract (English): |
The Zhouchangping large deep creeping ancient landslide is located on the left bank of the Minjiang River in Maoxian County, Sichuan Province. It had a large-scale rapid reactivation and dammed the Minjiang River in 1982. Based on field investigation and drilling analysis, the landslide is currently in deep-buried creeping deformation. Rainfall has an important influence on the deformation rate of the landslide. The moisture content of sliding zone soil and the sliding rate of Zhouchangping landslide have a great influence on its mechanical strength characteristics and the occurrence and development of the landslide. In order to study the influence of moisture content and sliding rate on the mechanical strength, this paper carried out ring shear tests of sliding zone soil with different moisture contents (8%, 15%, 25%) and different shear rates (0.1 mm·min-1, 5 mm·min-1, 100 mm·min-1). The results show that the shear strength of sliding zone soil decreases with the increase of moisture content, and the reduction is greater under high moisture content conditions. The strain softening phenomenon of the specimen becomes more obvious with the increase of shear rate, and its peak strength and residual strength generally increase first and then decrease. The internal friction angle of the strength parameter, linearly fitted by the peak strength and the residual strength, first increases and then decreases. Research suggests that in the case of rainfall conditions, high moisture content significantly reduces the shear strength of the sliding zone soil, which is likely to cause the Zhouchangping landslide to periodically creep. The accelerated sliding rate can again reduce the shear strength of the sliding zone soil, which can cause the landslide to reactive and block the Minjiang River as a whole again. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
位于四川省茂县岷江左岸的周场坪滑坡为一大型深层蠕滑型古滑坡，其曾于1982年发生大规模快速复活并堰塞岷江。根据现场地质调查和工程地质钻探资料分析，该滑坡目前正处于深层蠕滑变形中，且降雨对滑坡变形速率具有重要影响。滑坡滑动速率和滑带土含水率对滑带土的力学强度特性，以及滑坡的变形和进一步破坏具有极大影响，为研究含水率和滑坡滑动速率对周场坪滑坡滑带土力学强度的影响，本文在滑带土基本物性测试分析基础上，开展了不同含水率（8％、15％、25％）和不同剪切速率（0.1mm·min-1、5mm·min-1、100mm·min-1）的滑带土环剪试验。试验结果表明：在长距离剪切条件下，滑带土的抗剪强度随着含水率的增加而降低，且高含水率条件下降低幅度更大；随着剪切速率的增加，试样应变软化现象更加明显，其峰值强度和残余强度一般先增大后减小；由峰值强度和残余强度线性拟合的强度参数内摩擦角随剪切速率的增加则先增大后减小。研究认为在强降雨条件下，高含水率的条件使滑带土体抗剪强度显著降低，易导致周场坪滑坡蠕滑加速，加快的滑动速率会再次降低滑带土的抗剪强度，从而导致滑坡发生周期性蠕滑，并可能再次发生整体复活堵塞岷江。 [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
