Study On Mechanical Properties Of Periodically Saturated Rock And Engineering Application

This paper reseach the change regularity on mechanics capability of periodically saturated rock mass through field sampling,rock saturated design and a series of rock test, then combine the test results, analyse the strength reduction phenomenon of rock under the cyclic effect of water and rock, based on the software of FLAC, the stability of the rocky slope in a grocery port will be analysed with the method of finite element strength reduction. The research contents and results are as follows:â‘ Master the specific hydrological and geological conditions in Fu ning port waters of through field investigation and data collection of Fu ning port project, and get the curve of the water-level fluctuations,based on the changes of annual water level, periodically saturated rock mass is desigined similarly, determine the types of typical rock of the port, the experiment plan, operational processes, parameter index of acquisition needly in the course of experiments and the corresponding test method.â‘¡Related mechanical indexes of before and after saturated rock will be tested by a series of indoor tests like triaxial test, split test, ultrasound paramter test, moisture content test and so on, the value of shear strength and strength reduction coefficient are analysied and calculated with before and after saturated rock, then the variation curve will be got between saturated cycle and mechanical parameters, by fitting analysis on the test curve , fitting curves and equations will be got.â‘¢Combine the test rusults and based on the theory of fracture mechanics,the expansion situation of rock crack is analysis under the state of compression and tensile, which express that the produce and expansion of internal fracture of rock is accelerated with circular process of saturated and airdrying, thereby the strength of rock mass and the wave velocity are influenced. Based on the damage effection of water and rock interactions, the strength reduction phenomenon is accumulated of the damage effection of water and rock interactions which is caused by the process of periodically saturated and airdrying of rock mass, the damage accumulation is the main reasons to decrease the bearing capacity and influence the stability of rock mass.â‘£Combine the test rusults and based on the software of FLAC, numerical simulation on rocky slope in grocery port and the stability under the cyclic effect of water and rock is calculated with the method of finite element strength reduction, then the relationship of stability coefficient between saturated cycle and bank slope will be got, which provide reference materials to study the similar rocky slope of large stage fluctuation range waters.This article highlights:â‘ It carries out the periodically saturated design, based on cyclical variation rule;â‘¡It sets up the relationship between saturated cycle and rock mechanics parameters;â‘¢It analysis the stability of rock slop, based on periodically saturated test.