Based on the investigation and analysis of acid sewage quality component in some metal mine, and combining with the investigation on the engineering geology and the character of similar soil slope, the interaction and corrosion mechanism are studied between acid mine drainage and similar soil slope, it shows that the AMD changes the microstructure of rock-soil, displace and dissolve the integrant, magnify the structural scale, and hasten the new rift. The reinforcing treatments are proposed about using vetiver to consolidate the slope. The result from the practice shows that it has perfect mechanical effect using veriver to protect slope, and it is available to protect the similar soil slope, reduce the slope erosion-damage, and improve the slope stability.
In order to study the dynamic response of adjacent buildings in the
process of tunnel blasting excavation, taking Yangjia tunnel blasting
through a five-story frame structure residential building as an example,
the propagation law of blasting seismic wave was analyzed by using HHT
method through on-site blasting monitoring. Then, the ALE algorithm in
ANSYS/LS-DYNA software was used to establish a three-dimensional
numerical model based on the surrounding rock-cutting section-structure
coupling to study the dynamic response of adjacent buildings under the
blasting vibration of tunnel. The results show that the HHT analysis
method can clearly describe the energy distribution of vibration signals
in the time and frequency domain. The energy carried by the blasting
vibration signal is corresponding to the detonating section, and the
maximum energy appears in the cutting section, which further verifying
that the vibration effect caused by the cutting hole blasting is the
strongest. In the process of tunnel blasting, the dynamic responses of
beams, columns and exterior walls of adjacent buildings are not
consistent and show different variation rules along the height
direction. In addition, the stress centralization mainly occurs in the
exterior wall of the building, the joint of the exterior wall and the
column, the joint of the exterior wall and the beam, and the joint of
the exterior wall and the floor and other non-weight bearing area,
indicating that these parts are more likely to damage and crack in the
process of tunnel blasting.
Because the relationship is not considered between physical behavior and cross sections of bars, the conventional reinforced earth retaining wall design based on constant value would lead to some limitations: the haul-resistant coefficient of the top wall is not enough, but it goes beyond at the bottom of retaining wall. In the paper, considering the SARMA method, based on computing formula of traditional slope stability, the detailed programme is realized by the language of FORTRAN, it can make up deficiency that lies in the tradition reinforced earth retaining wall by considering the relationship of physical behavior and cross sections, lengths and layers of bars. Finally, the system program has been applied to a slope treatment project in Guangzhou. Compared with the design method of traditional regulations, it is demonstrated that the optimum length required is obtained, the cross section and length of bars are fully used, and the design is simplified.
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