Research On Chenzhou Colluvial And Residual Soil Slope's Process Stability And Process Control

For a long time, the development and construction of Chenzhou is always restrained by slope geology disaster. In recent years,with the large-scale infrastructure construction,such as the road construction, railway network's construction and the renovation of the highway network,new slope were largely increased,and simultaneously more slope geology disasters were caused,which brought the heavy loss for the local government and the people. The high frequency of the slope geology disaster shows that the existing standard for design and construction is imperfect in dealing with the slopes in Chenzhou. So,a more pointed standard and idea needs to be brought forward.Colluvial and Residual soil slope with high frequency of geological disasters is the most prominent problem in Chenzhou. Colluvial and residual soil slope's main characteristics was summed up,the properties of the typical Colluvial and residualsoil in Chenzhou,including Baigaini,Coal soil, Red Clay,was studied and the mechanism of slope stability of the process was analyzed. The concept of slope's process stability and the idea of process control were raised for the first time, slope's process stability evaluation model and control model established and applied in Chenzhou Colluvial and residual soil slope, the mechanism of slope's process stability controlled by cement-silicate double solution grouting control is studied. The main contents and achievements are as follows:(1) Based on investigation, the main failure type,slope structures, unstable modes and the main factors influencing the slope's process stability was summarized.(2) By experiments,the basic physical properties and the water sensitivity of the typical Colluvial and residual soil in Chenzhou were studied and the function model between the shear strength parameters and moisture content was established. By X-ray diffraction,the main mineral components of typical Colluvial and residual soil in Chenzhou was Semi-quantitatively analyzed and by SEM,the microstructure characteristics researched,which were used to study on the engineering properties of the typical Colluvial and residual soil in Chenzhou.(3) Combined with the main failure factor of Colluvial and residual soil slope in Chenzhou,the concept of slope's process stability was raised for the first time. Using the finite element software PLaxis,the slope's process stability evaluation model was established and the influence of different construction sequence on excavation process stability, the numerical simulation of the gradual failure process of the slope and the influence of moisture content on slope's process stability were discussed. Furthermore,based on the different disturbance degree of soil's strength parameters when softened by water,a new estimation model was put forward. The mechanism of slope's process stability was studied on.(4) The idle of slope's process stability control were raised for the first time. Taking the typical Colluvial and residual soil slope in Chenzhou, the 6th slope of Xiangshan Road which had occurred three large-scale landslide as research background, the failure process model and treatment process model were established, the mechanism of failure researched, and the control measure designed. According to the monitor data, the models were inspected to be correct and the slope's process stability control was proven to be effective.(5) Based on the model of slope's process stability controlled by cement-silicate double solution grouting control, the mechanism of the process control was studied through comparison with the different excavation schemes, which was controlled by cement-silicate double solution grouting and non-controlled. The influence of cement-silicate double solution grouting with different ratio of cement, water, concrete and silicate on the slope's process stability control was studied and the main point of the method was put forward.