Yongan Landslide Mechanism Of Resurrection And Preventive Measures In Tongjiang Country Of Sichuan

Founded in sichuan TongJiangXian yongan middle 1950s, home is located in tongjiang has a creep, cracking of the landslide are wide, landslide slope 300m long 560m, Area(8.1×104m2), Volume(8.1×105m3). In the groundwater and human activity, landslide factors such as the recent different degrees of deformation of campus, teachers and students and residents life constitutes a great threat to safety. Therefore, the study of the formation of landslide mechanism and evaluation of resurrection, and the stability of landslide rational control measures have important significance.Based on the wing for the secondary landslide object of study, the engineering geological surveying and mapping, combined geophysical exploration and drilling, groove found such exploration geology environment conditions, landslides and deformation of the structure of landslide rupture characteristics, based on the analysis of the landslide, the formation mechanism and the resurrection of recent assessment mechanism, the stability of landslide, further study of the landslide. Major achievements obtained as follows:(1) In the middle ancient landslide yongan by mudstone layer Kch1 (each) slow leans toward layer structure of landslide slope, the formation mechanism of creep cracking, for the weak mezzanine constitute the creep deformation and cracking of landslide of sliding surface.(2) Recently raised the landslide has obvious zoning characteristics, in general, could be divided into strong deformation areaⅠ(zone), weak deformation area (Ⅱarea), without obvious deformation area (Ⅲarea) three areas. The resurrection of landslide is mainly on deformation and cracking of creep deformation of the type,Ⅰoverall performance for edge circle arc shape cracking, YanHang crack side of edge and the characteristics of bulge uplift The overall andⅠ,Ⅱdeformation area similar, but deformation was significantly lowerⅠarea, front has no obvious abscesses uplift.(3) According to the structural deformation and fracture landslide, the space characteristics of groundwater and human engineering activities, analyzing the reasons of the resurrection of landslide in the near future. The landslide division of resurrection and groundwater, excavation site, building loading and level of living water, and closely related to emissions by finite element numerical simulation method is used to simulate the landslide of creep deformation and cracking of resurrection mechanism.(4) Based on the qualitative analysis using limit equilibrium method, the stability of landslide assessment. Results:Ⅰarea (strong) in heavy deformation condition in stable condition; owedⅡarea (weak) in owe stable deformation stability condition,Ⅲarea (no obvious deformation zones) in the basic stability condition.(5) According to the structure of landslide stability condition, reasons and resurrection, selected anti-slide pile retaining structure with surface drainage engineering measures of integrated management of landslide and according to the type of passage landslide creep cracking deformation characteristics, the numerical simulation method was used to study the effective arrangement of pile location. When the pile and layout to uplift the edge, landslide deformation is not effectively control, after the formation of a new uplift, When the pile in the middle of the dead body arrangement, pile on the creep deformation landslide control effect is obvious.