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³¤°²´óѧѧ±¨£¨×ÔÈ»¿Æѧ°æ£©[ISSN:1006-6977/CN:61-1281/TN]

Issue:

2019Äê01ÆÚ

Page:

25-33

Research Field:

µÀ·¹¤³Ì

Publishing date:

Info

Title:

Impact of temperature and humidity on rock mass shearª¤strength of siltyª²mudstone slope

Author(s):

FU Hongª²yuan;  CHEN Xiaoª²wei;  CHEN Jingª²cheng;  ZENG Ling;  QIU Xiang

(School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China)

Keywords:

road engineering;  slope engineering;  siltyª²mudstone;  shear strength parameters of rock mass;  Hoekª²Brown criterion

PACS:

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DOI:

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Abstract:

In order to study the change law of the rock mass shear strength parameters of siltyª²mudstone slope impacted by temperature and humidity, a method for calculating the rock mass shear strength based on the Hoekª²Brown criterion was summarized. According to this method, a series of uniaxial mechanical tests were implemented, and the uniaxial compressive strength ª«¦Òª«ª­c, splitting strength ª«¦Òª«ª­t, and ultrasonic velocity ª«Vª«ª­ª©piªª of siltyª²mudstone specimens under different temperature and humidity conditions were obtained. Based on these test results, the rock mass shear strength parameters of siltyª²mudstone slope were calculated and analyzed. The results show that ª«¦Òª«ª­c, ª«¦Òª«ª­t, and Vpi of siltyª²mudstone decreases under the effect of temperature and humidity, and the decreasing range associated with temperature difference ¦¤ª«Tª«, temperature cyclic times ª«nª« and water content ª«wª«. When temperature changes individually, the rock mass cohesion ª«cª« and internal friction angle ª«¦Õª« are reduced, while the decrease rate of c and ª«¦Õª« increases with the increase in absolute temperature difference |¦¤ª«Tª«|, average temperature in the temperature changing process, and ª«nª«. Humidity changes only when the rock mass soaks water at a constant temperature, and ª«wª« increases rapidly in the early stage and slowly in the later stage; the shear strength parameters ª«cª« and ª«¦Õª« pertaining to the rock mass exponentially decrease with the increase in ª«wª«. When temperature and humidity change simultaneously, ª«cª« and ª«¦Õª« are significantly lower than those in the natural state because the humidity is affected by the change in temperature; ª«cª« and ª«¦Õª« increase with an increase in |¦¤ª«Tª«| in the heating cycle, and decrease with an increase in ª©|¦¤ª«Tª«|ªª in the cooling cycle. Under the equal duration, the impact of humidity on the shear strength parameters of rock mass is greater than that of temperature; the decreasing rate of the rock mass shear strength parameters impacted by simultaneous changes in temperature and humidity is greater than the sum of that of temperature and humidity changes individually, shows a synergistic effect between temperature and humidity; the decrease rate of ª«cª« is always larger than that of ª«¦Õª«. 3 tabs, 15 figs, 22 refs.ª¤

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Last Update: 2019-01-28