Multiple-factor analysis and optimization play a critical role in the the ability to maximizethe stimulated reservoir volume (SRV) and the success of economic shale gas production. In this paper, taking the typical continental naturally fractured silty laminae shale in China as anexample, response surface methodology (RSM) was employed to optimize multiple hydraulic fracturing parameters to max...

Since rocks are aggregates of mineral particles, the effect of mineral microstructure on macroscopic mechanical behaviors of rocks is inneglectable. Rock samples of four different particle shapes are established in this study based on clumped particle model, and a sphericity index is used to quantify particle shape. Model parameters for simulation in PFC are obtained by triaxial compression tes...

Affected by climatic conditions such as rainfall, evaporation and air temperature, most of the backfill soil is in an unsaturated state, decrease matric suction leads to failure retaining structure. In view this, this study takes vertical rigid wall with narrow research object, assuming that behind forms a circular arch considering interlayer shear stress; thus, analytical solution active earth...

One of the critical design parameters used in evaluating soil structure is friction angle, derived from Mohr's Circle failure criterion. The angle an engineering parameter estimated laboratory to quantify shear strength geotechnical applications. This paper indicates experimental study investigating impact particle size on different sandy soils behavior. direct test equipment useful for simulat...

In the spring thawing season, decrease in strength of frozen soil caused by temperature may lead to slope instability. Therefore, researchers have studied relationship between and freeze-thaw zone. However, previous studies considered impact on strength, but less research shaping temperature. direct shear tests were performed specimens with different temperatures (i.e., −5, −2 1 °C) water conte...

The strength evolution law of concentrated full tailings is closely related to the storage construction method, especially growth shear with curing age. This study aims investigate influence materials on and reveal change Therefore, we carried out a comparative triaxial test between pure different ages. results show that had 70.7% higher cohesion 10% larger internal friction angle (IFA) than at...

Soil contamination by different hydrocarbons has rapidly expanded worldwide, surpassing the self-purification capacity of soils and increasing number contaminated sites. Although much effort been devoted to study effects diesel on geotechnical properties soil, there is still limited available information about it. Moreover, no maximum retention that soil can have its effect behavior soil. Thus,...

Based on the strength reduction method, laws of slope displacement and changing positions sliding surface during filling process are studied. The model multistage fill is established by finite element software PLAXIS. difference compared between with no reinforcement under same working condition. Sensitivity analysis carried out from two aspects which internal factors external factors. shows th...

This study investigates the probabilistic stability of embankment slopes subjected to water level drawdown using random field finite element method (RFEM) with strength reduction technology. The shear soil properties was controlled by cohesion and internal friction angle for slope failure. were modeled a following log-normal distribution. factor safety (FOS) is calculated During numerical simul...