Applied Mechanics and Materials Vols. 170-173

Abstract: This document introduces a kind of new technology including testing pile, making pile, measuring pile----the technology of the inner struck pile. The mechanism for the inner struck piles and small area method for testing pile was explained. The coefficient of the pile endpoint resistance was calculated in different depth with the finite element software and it's variation was analyzed with different parameters' variation (cohesion, friction angle, elastic modulus, Poisson's ratio). The result shows that the value of the coefficients of the pile endpoint resistance reduces with the rising of the value of depth and the value is affected by the size of the pile head and the soil parameters.

Abstract: The upper soil layer is weakness and not as a natural foundation. The middle soil layer is collapsible loess, the lower soil layer is good but buried deeply. After discussion, the ground treatment method using the lime soil cushion. This paper calculated the bearing capacity of the lime soil cushion, and designed the thickness and width. And checked the bearing capacity of the weak underlying layer, and discussed its construction and testing measures.

Abstract: In order to explore the blasting effect with charged by different length/diameter ratio in rock, adopted ultra-dynamic strain testing system to test the blasting strain wave with charged by little amount of explosives and different length/diameter in the rock models. Analyzed the radial blasting strain wave signal in the medium under the conditions of coupling charging explosive loading, got the generalities and difference of the explosive strain waveform features with charged by different length/diameter ratio, and relationship of peak strain with the relative distance. The results show that peak strain was greatly affected by the change of length/diameter ratio and charge mass in the area of close blasting source, when the relative distance is more than 45, the influence is less. Made the length/diameter ratio is 20 to be the boundary, when the length/diameter ratio is greater than 20, the peak strain attenuated slowly. The explosive energy of the big length/diameter ratio is relatively decentralized to the medium, improved the energy utilization ratio of explosives. The measured results provided a new experimental basis to further understand correctly the rock blasting mechanism.

Abstract: The rock attitude elements play important role in the fields of both mechanical properties and stability analysis. The traditional statistical graphs such as rose diagram, isopycnic graph and angle histogram are displayed which can roughly estimate the dip direction and angle of rock mass. And k-mean clustering analysis is applied to rock mass discontinuity attitude automatic statistic which can determine the the dip direction of rock mass accurately and estimate the proportion of gathered data. The K-mean clustering analysis is a beneficial supplement of traditional statistical methods, which has a prospect of engineering application.

Abstract: In order to find out the slaking mechanism of carbonaceous mudstone, this study puts two different samples in the indoor soaking slaking test, one of dried sample and the other original one. After comparing the characteristics of carbonaceous mudstone slaking particles 's distribution under different moisture content conditions , the result shows: The main reason for carbonaceous mudstone slaking is the change of moisture content resulting from dry-wet circulation. The difference in moisture content partly affects the process and slaking product before slaking. The lower the moisture content is, the smaller the slaking particle diameter is and the more thoroughly the slaking is. As the particle diameter of the slaking product decreases, its slaking gradually weakens and even disappears.

Abstract: This paper studies on deformation parameters through plate loading test (PLT) of some different areas plate, Standard penetration test (SPT) and laboratory test in Dynamic Compaction (DC) desert foundation in Inner Mongolia based on engineering practice. According to the result of experiment, it established relationships between deformation modulus and SPT counts values, compression modulus and SPT counts values, compression modulus and dry density, that can gain experience for detection of DC in similar site.

Abstract: Participating in the college students reinforced earth retaining wall competition of 2012 "youlinshubulyoke cup", and puting forward set of spherical bodies reinforced in the rear of steel strip rebar in order to increase the anchorage zone of strip type rebar and soil action area ,and converted the friction coefficient between soil and bar tape into soil and soil, thereby increasing the frictional resistance and the pull-out force. Making reinforced earth retaining walls in the same level of load, to achieve the purpose of saving the materials.

Abstract: The slope stability assessment is performed to assess the safe and mitigation design of slopes and the equilibrium conditions. This paper selected Duke River located in Rangtang County, Sichuan Province, Western China as study area to delimit the areas liable to slope failure hazards. The fuzzy matter-element extension theory was used to analyze the slope stability of the study area. Six factors including slope, slope type, lithology, rainfall, elevation difference and land use were selected and classfied for assessing the slope stability. Result indicated that the unstable region was 1186 km2, which occupies 69.32% of the total study area. 16 slope failure hazards and 29 debris flow gullies sited through field investigation were used to test the assessing results. And the testing data indicated that the assessing result of the study area was reasonable.

Abstract: In order to improve the mechanical property of the problem soil and satisfy the need of actual engineering construction. Cement-improved soil gradually becomes one kind of common fillings in subgrade construction. Under the soaking or unsoaking conditions, the natural soil and improved cement-soil with different compaction degree, study the compressibility of the Laterite soil in somewhere in Hunan. And also analyze its change rule of compressibility. It shows that the compression deformation of improved cement-soil reduce significantly when compared with natural soil sample; at the same condition, the larger compaction degree is, the smaller deformation of soil sample will be; and the deformation of the soaked soil sample will be larger than the unsoaking ones.

Abstract: The rocky slope instability has brought great danger to human activity, and often causes economic losses, property damage and casualties, also can cause huge overhead expenses. Rock slope stability analysis must understand the geological conditions as the foundation, be under the analysis to effects of geological factors of rock slope stability, be under the premise of analysis to the engineering geological factors and then make evaluation, this is the best method of analysis and evaluation of stability of rock slope effective. This paper utilizes quick Lagrange difference analysis (FLAC3D) to Zhu Jiadeng landslide in Chongqing, the numerical simulations are to determine the landslide static stability, and provide the basis for management.