Applied Mechanics and Materials Vols. 204-208

Abstract: A numerical model was built by Finite Element software,discussed the effect of rainfall on slope pore water pressure、volatile water content and depth of infiltration in rainstorm condition. The results indicated that: (1)the variation of slope surface pore water pressure is more significant and the depth of infiltration is larger with the increase of rainfall intensity on the condition of fixed rainfall duration;(2)The slope section appears three pore water pressure divisions: transient saturated zone、negative pressure region and hydrostatic pressure area after the rainfall.

Abstract: Based on the analysis theory of plasticity limit, a formula of virtual work and an energy equation are established for the stability analysis of anchored soil slope, in which the soil nails and anchors are regarded as the internal structure which consumes the external power in the soil slope engineering.In the meantime, based on the simplified method of circular slip, another formula which can consider many factors such as the self-weight of slope, earthquake force, pressure of pore water and the force of anchor, is established to analyse the whole stability of anchored soil slope. It has important values for perfecting the analysis method of soil slope.

Abstract: The author measured the TC of losses-like soil in Changchun with QTM-D2 and discussed the effect of samples in different sizes, the testing error in lab and in site. The research about the size error of TC offered feasible solution to measure TC of geotechnical materials in site. In addition, the empirical relations between TC and temperature of sand and loess-like soil, and their temperature variance coefficient  were also summed up by experiments. It has important significance to understand the heat-conducting property and simulate temperature field of geotechnical materials in northern China.

Abstract: According to energy principle, numerical methods of axial force and displacement of tension-type anchor are derived. Firstly, mechanism of tension-type, computation model of anchoring unit and side resistance are discussed. Secondly, anchoring unit energy balance equations are derived, and given the difference form. Thirdly, program calculation method and program convergence strategy are illustrated. At last, anchor bearing character is analyzed. The main conclusions are: anchorage body bearing character could be reasonably analyzed by using the energy method. The analysis results can provide the reference for engineering design.

Abstract: Soil-Rock Mixture (SRM) is a unique type of geological material characterized by inhomogeneous composition and complicated structures. This paper investigated the fracture mechanisms that govern the strength and deformation of SRM subjected to uniaxial compression loads by means of computed tomography (CT) techniques. The self-designed loading devices and self-developed image processing program were applied to identify and quantify the fractures inside SRM during compressions. The results show that the internal fracture behavior of SRM greatly depends on the rock ratios of SRM.

Abstract: Double-row piles retaining structure has been widely used in the project now, but the stress mechanism of double-row pile is more complex; Its internal force and deformation are affected by many factors. Understanding and mastering its effects has an important significance for the design and the optimization of double-row pile supporting structure. According to the comparison of the measured data and theoretical calculation about original support scheme and optimized support plan and combined with the soil test data, this paper takes the Jinan Cultural Arts Center(Theatre) stage bin foundation pit as an example to analyse the main effects of optimization design about double-pile supporting structure. The results show that soil shear strength, soil arch effect, influence of CFG composite foundation, pile-beam synergy effect and space effect of foundation pit play an important role for optimization design about double-pile supporting structure.

Abstract: The basic principle of transient electromagnetic method (TEM) is introduced in this paper, and it was used to explore position of the goaf which existed under Fushun east open-pit mining slope systematically. Inversion based on results of the exploration determines the location of dangerous abnormal area, provides a theory support for next exploration drilling, avoids too high economic loss because of blindly exploration drilling, and provides scientific basis for mining design and safety production of open-pit.

Abstract: Filled road embankment along river levee or widen river levee as road embankment is often used in highway construction, part of the embankment will always immerged in water for seepage. The intensity of the filler will decrease due to the long-term immersion，which lead to eventually failure, especially in the expansive areas. This paper carried out CBR test on the lime improved expansive soil after different time’s immersion. The test results show: The CBR will linearly decreased with the previous immersion time, and then, it varies very small with the immersion time, and the stable CBR after long term immersion is about 80% of the CBR under standard condition. The paper put forward a prediction model of CBR by the immersion time, it can be used to predict the CBR of improved expansive after long term immersion, and to judge whether it meet the requirements of specification.

Abstract: In order to anlysis the rock stress and deformation characteristics in influence of mining disturbances, water pressure and crustal stress, a multi-physics coupling model is created by Comsol4.2a in this paper.By debugging mining steps,the model simulated rock stress and deformation characteristics: under mining disturbance and water stress affect, the rock stress and displacement is basic to its original state when roadway away from the fault is greater than 205m, but the rock stress and deformation displacement increased significantly at the contact surface of fault and coal seam when coal lane away from the fault is less than 105m,and the stress gradient increased significantly between the fault and the mine roadway. the paper determine the 105m as the "critical distance".

Abstract: The tailings dam stability is an important part in the evaluation of the tailings dam, at present setting-value evaluation is the main method through all, calculation models has failed to consider variability and inhomogeneity of many factors that can influence the stable state of tailings dam, which make the calculation results that can not comprehensively reflect the actual status and stability of tailings dam. The analytical method of reliability based on probability theory, mathematical statistics and operational research, not longer use a specific safety coefficient to measure the stability of the slope, instead define the instability of the slope as a probability result. With the increasingly wide range of applications and the rapid development of analytical method of reliability in engineering practice, and this method will eventually become a tailings dam stability evaluation method.