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Jian W.-B.,Fuzhou University | Jian W.-B.,Fujian Provincial Key Laboratory of Geological Hazards | Zhang D.,Fuzhou University | Zhang D.,Fujian Provincial Key Laboratory of Geological Hazards | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2014

Based on a dam foundation engineering in Fujuan province, single-hole acoustic test, cross-hole acoustic test and seismic wave test were carried out to detect the P-wave velocity of dam foundation rock mass before and after consolidation grouting. The elastic theory was used to calculate dynamic elastic modulus; and the change of deformation parameters before and after consolidation grouting were studied. A modified Hoek-Brown criterion was proposed to calculate the parameters in Hoek-Brown criterion. The results show that the consolidation grouting effect is controlled by the groutability of rock mass and effected by the rock mass structure. The consolidation grouting effects in different directions are different. For strongly weathered rocks, the consolidation grouting effect in vertical direction is better than that in horizontal direction. For medium weathered rocks with gently dipping discontinuous faces, the consolidation grouting effect in horizontal direction is better than that in vertical direction. The functional relationship between the increasing rate of dynamic elastic modulus and the increasing rate of velocity is quadratic. The functional relationship between the increasing rates of m, s (where m is Hoek-Brown parameter, s is parameter related to quality of rock mass) and the increasing rate of velocity for strongly weathered rocks are both linear and for medium weathered rocks are both cubic. It is of important significance for design and construction of grouting. Source


Jian W.-B.,Fujian Provincial Key Laboratory of Geological Hazards | Jian W.-B.,Fuzhou University | Xu X.-T.,Fuzhou University | Zheng M.-Z.,Fujian Provincial Key Laboratory of Geological Hazards | And 3 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

The shallow instability of granite residual soil slope could easily induced by rainfall. Based on the analyses of influence of rainfall on the water content of slope soil, the effective rainfall resulting in soil from unsaturated to saturated condition is derived from the relationship between saturation and water content. Results show that not all rainfall will cause the instability of soil slope, and only when the soil saturation caused by rainfall infiltration reaches a certain degree the slope fails. There exists a critical depth in the unsaturated and saturated zone of slope above which the rainfall infiltration leads to a transition in soil from unsaturated to saturated, different shear strength could be used to calculate the stability of soil which was divided into fluctuation two parts by the critical depth. The soil unsaturated zone and saturated zone can be taken to calculate the stability of the soil condition. The results are useful for determining rainfall threshold of slope instability, so as to further understand the mechanism of landslide instability and landslide prediction. Source

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