Advanced Materials Research Vols. 261-263

Abstract: Earthquake is one of the main geological disasters that cause slope instability. The stability analysis of soil-rock mixture slope under earthquake is made with FLAC3D in this paper. According to finding the shear strain concentrated deformation zone and the size of the displacement, they can help us to find the possible instability of the scope and location. The study result shows that the slope is stable in the natural state and certain displacement would occur in the potential slide mass of the slope under earthquake, and this must be taken into serious consideration in practical engineering.

Abstract: The fiber Bragg grating (FBG) technology is studied based on the current monitoring status of the highway soft ground settlement, for instance, the low degree of automation, the unsatisfied accuracy of the device, the slow data transmission and the greater measurement errors. The limited measuring range and the difficult situations of the soft ground burying and installing of the fiber optic sensor still need to be addressed. This thesis has analyzed the development of the long range optical fiber displacement sensor as well as its burying techniques which are suitable for soft ground settlement monitoring. Both of them have been successfully applied to De Chang Highway D10 subject. The study also shows that the long range optical fiber displacement sensor is able to meet the requirements of the soft ground monitoring. And data can be accurately monitored by means of real-time or on-line continuously. This is of great significance in pushing forward the development of the fiber optical monitoring technology in the field.

Abstract: In view of one-sidedness and the limitations in comprehensive evaluation index for water inrush risk, a variety of factors of water inrush induced by deep mining of Beiminghe iron mine are analyzed from hydrogeological characteristics, structural characteristics and mining. Faulted structure, water storage capacity, water pressure, water-resisting layer, miming effect and the change of stress in surrounding rock of two levels of deep mining in mine area are quantized by rock permeability test, field pumping test and finite element numerical analysis. Mathematic model of risk assessment of water inrush in deep mining of Beiminghe iron mine is established by using fuzzy comprehensive evaluation method. Quantitative assessment of water inrush risk is carried out to obtain the value of rank tendency for water inrush risk through that mathematic model.

Abstract: Construction wastes have attracted more and more public attention with the development of the city construction. On the basis of summarizing the existing slurry treatment technologies in relevant area, a new slurry treatment process is proposed according to the characteristics of waste bored pile slurry. Three steps included in this process: slurry purification, flocculation and pressure filtration. A practical application is used to demonstrate the feasibility of this process. The results show that the slurry is disposed without pollution, achieving zero discharge of pollutants.

Abstract: Cores were taken from the hanging wall of the III -1 ore body at Kangjiawan Lead, Zinc and Gold Mine. 50 samples for compression and tension tests were fabricated. 50 compressive and 50 tensile strength values were obtained by RMT-150B testing systems. The probability distributions for the compressive and tensile strength were tested by the hypothesis test method. It proves that uniaxial compressive strength follows normal distribution and tensile strength follows the lognormal distribution. And it proves that elastic modulus and Poson’s ratio follow normal distribution. 50 pairs of cohesion and internal friction angle were obtained by randomly drawing a uniaxial compressive and tensile strength samples from 50 measured values. Cohesion follows lognormal distribution and internal friction angle follows normal distribution through hypothesis test method. With the results, some references can be conveniently provided for prediction of the strength and distribution of similar rocks in related geotechnical projects.

Abstract: A state-dependent critical state model is employed to analyze strain localization of sand in this paper. The sand model is developed based on the concept of the state-dependent critical state for sands, and an analysis of strain localization is performed on the drained plane strain tests of Hostun sand. The results show that the state-dependent critical state model is capable of simulating the effect of initial state on strain localization compatibly.

Abstract: Soil foundation in Tianjin Harbor is formed by hydraulic filled materials strengthened by vacuum preloading method, which is still with lower strength and larger compressibility. Large settlement and wavy failure of the roads constructed on such soil foundation are often taking place after two or three years of construction, because of the heavy vehicles running on the roads with high frequency. In order to deal with the existing problems of constructing roads on such very soft soil foundation, the following work is carried out: the displacement characteristics of roads constructed on very soft soil foundation are identified; the design methodology of constructing roads is discussed; the settlement of the constructed roads is calculated with FE methods and the mechanism of wavy failure of the roads on very soft soil foundation is analyzed.

Abstract: Slope project is often appearing in rock and soil engineering such as water conservancy, mine, highway and railway etc. And deposit slope is a special natural one. For probing into slope failure mechanism and prestressing loss of anchorage cable in deposit body, this paper researches it by numerical simulation. Study result shows: First, three leading influence factors, which are deposit slope lithology and structure, in-situ stress, and groundwater, may induce slope failure; Second, slope failure patterns chiefly includes landslide along the interface between bed rock and deposit, and part circular slippage in shallow deposit body; Last, it appears prestressing positive loss and negative loss of anchorage cable in study area, especially the latter occurs because of the slide interface existing in deposit body, and changing technical parameters of anchorage cable can partly improve prestressing loss.

Abstract: According to the study of electrical properties of geological bodies crust, different instruments electric field is measured through the case, then the distribution of the electric field is studied in order to understand the situation of deep underground geological principles. The unknown bodies underground, cave, mined-out areas, ground water detection of two typical survey lines are detected with AGI high-density resistivity measurement system, which the three selected acquisition mode are selected, the sectional drawing of two-dimensional inversion is obtained by data collected processing; the coupling analysis is detected in exploration information and strata Information according to the corresponding geological profile, both high resistance and low resistivity anomalies of the underground and the character of the corresponding space area are accessed; the possibility and ease of the ground surface collapse of different anomalies is pointed out according to the surface geological information and the situation of surface subsidence.

Abstract: Environmental & structural safety hearing to schematic designing of timbering system for retaining and protecting for foundation pit excavation in Guangzhou region, as a method of compliance control of designing, shows some controversy and compulsory. Technological and management disagreements reconciliation on environmental and structural safety of timbering system is expected through the safety hearings. For timbering system, empirical design takes the role of conceptual design, and boundary condition recognition, construction influence consideration and countermeasure deficiency concerning has to be emphasized during empirical designing experiences. Opportunities for researches also originate from the problems appeared or questions brought forth during the safety hearings. It is necessary to carry out pertinent mechanical analysis to rule-of-thumb measures. Efficiency and fairness is highly required for available process of technology management of finding and confirming suitable engineering technical solutions within the safety hearings.