川东红层原状滑带土饱水软化试验研究

doi:10.13722/j.cnki.jrme.2014.1003

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Abstract Consists of sandstone and mudstone，the red-bed slopes in the east of Sichuan province belong to high geological hazard-prone areas. The soft layer(especially muddy layer) in the slopes was prone to be softened by water with the reduce of its mechanical strength，which favors the development of potential sliding surface. With the aim of revealing the change law of microstructure and mechanical properties of samples，a series of experiments of the sampled undisturbed soil from landslide sliding zone under the saturated condition were carried out. The result shows that after saturating the internal structure of tested soil became loose，meanwhile the way of connection of soil particles changed from plane-plane to plane-edge，edge-edge. Both cohesion and internal friction angle variations follow an exponent curve and tend to be stable after soaking 10 days. According to this result，the softening effects on slope stability were analyzed by the limit equilibrium method. The calculation result shows that slope stability coefficient is reduced with the softening of soil of sliding surface. Some slopes may eventually tend to be unstable even though without the static water pressure from the rear crack of slope and uplift pressure from sliding surface. Therefore，the dramatical decrease of soil strength due to softening and saturating is considered as the important cause of slope failure in red bed regions. The research conclusion can provide an important basis to understand genetic mechanism of landslides and control hazards in Sichuan red bed area.

Key words： soil mechanics undisturbed slip soil microcosmic structure mechanical properties saturated softening stability calculation

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	Articles by authors
	LI Jiang1
	2
	XU Qiang1
	HU Zeming2
	LIU Hangxiang1
	ZHANG Qun1
	LU Yuanhang1
	WANG Sen1

Cite this article:

LI Jiang1,2,XU Qiang1, et al. EXPERIMENTAL RESEARCH ON SOFTENING OF UNDISTURBED SATURATED SLIP SOIL IN EASTERN OF SICHUAN PROVINCE RED BED[J]. , 2015, 34(S2): 4333-4342.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1003 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/4333

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