Study On The Effect Of Grouting In Karst Subgrade Detection By Water Pressure Test Method In Coverage Karst Collapse

Karst is widely distributed in China, kasrt ground collapsing is distributed most widely and the damages are disastrous. In order to prevent and cure the bad effect ion.it is important to judge correctly the development scale and probability of collapsing.which provide the basis for design in the karst area. Currently it is a new topic solving karst collapsing.This thesis is focusing on three groups of model test.The thesis closely tracked by water pressure test method for detection of karst subgrade.From Study on karst collapse mechanism to Prediction and evaluation of karst collapse problems.and then to evaluation of karst grouting effect.they are interrelated and interlocking.The thesis takes the karst correlation topic research as a breakthrough point, takes the indoor hysical model test as the support, Combined with the field test case analysis for the study means, From theoretical studies (Study on the critical condition of karst collapse) to the application (Evaluation of karst embankment grouting effect).The mechanism of karst collapsing is described in this paper.it introduces determination test of slit width when the collapsing is in critical state,which supply date for water permeability of crack rock in model test.Coverage effect cover soil on karst collapse collapse.By assuming a specific condition of ideal model state indicators Forecast karst collapse critical condition then Through the collapse of critical width of fractured rock mass permeability test,Model tests and test data analysis,Summary of the water permeability of rock mass under the karst collapse in the critical gap width of a specific model conditions recommended formula Provides the judgment basis for the karst roadbed note thick liquid water percolation rate law examination Under cover-model test of karst collapse collapse of critical fracture permeability test,With solid geological model.Establishment of subgrade in karst water pressure test of Grouting effect detection model.Their results show that. Grouting is effective to block the seepage paths and prevent karst collapse,Final combining engineering instance,The use of experimental research and analysis to solve production problems,This approach is also validated the effectiveness of the various types of model test. Provide a frame of reference for karst remediation decision-making.