Electromagnetic linear actuator (EMLA) is an alternative of the conventional damper in vehicle suspensions and harvests suspensions vibration energy which is wasted generally. Due to large variations of its Back Electromotive Force (Back-EMF), it will thus be interest to investigate how to recycle the electricity efficiently. In this paper, to improve the recycling efficiency of the EMLA, a feedback energy circuit featured with combination of parallel switchover supercapacitors technology and a boost-buck DC-DC converter is proposed on the basis of the generating characteristics of a newly designed EMLA. By modeling the feedback energy circuit, its dynamic characteristics are simulated and its efficiency is investigated. The results of simulations and experiments show that the feedback energy circuit can achieve a wide range of energy recovery regardless of large variations of Back-EMF induced by the EMLA. Simultaneously, by keeping the boost-buck ratio less than 3, the efficiency of energy recovery is high, in some cases could reach 94%.

Model tests for slope anchor bolts were carried out aiming at the conditions of weathered basalt soil slope in western Guizhou Province.The tests were to explore the strain distribution curves under various conditions such as the curves of a single bolt,the curves of bolts in a row at slope surface,slide plane and bolt ends,and curves before and after slope seepage or under different load levels.We studied the load-displacement curves of bolts with various anchorage lengths that were under the same drawing force.The results show that the strain distribution along a bolt is a curve characterized as larger in middle and smaller at two ends,while the deformations of bolts generally concentrate at the first row under slope top and the strain at toe and top of a slope is relatively larger than other parts,which results in easier destruction.At the beginning stage of a load process,the negative strain of the anchor bolts manifests that the anchor bolts is a tension-compression-bending composite number.

The progressive failure mechanism should be considered in the stability analysis of soil slopes with fissures and expansion-contraction characteristics.This paper presents the numerical analysis results of slope stability analyses using the strength reduction method.Local deformations as well as the development of the failure planes can be numerically simulated by ABAQUS.As a result,the factor of safety and the effects of the slope angle and the soil dilatant angle on the slope stability can be observed.

The principle of effective stress based on unsaturated soil material model and the boundary conditions of rainfall infiltration on the slope are introduced. The numerical model is built according to the example, and then the ABAQUS finite element program, which is combined with fluid-solid coupling, is used to simulate the problem of transient seepage field caused by rainfall infiltration. With the powerful post processing functions ability of ABAQUS program, we can observe the variation law with the time of pore-pressure distribution and displacement field and equivalent plastic strain. Moreover, the effect on the stability of slope under rainfall infiltration is analyzed.

According to Yunnan,Guizhou province basalt areas of the slope soil,design an indoor model test of the slope anchor pulling.Test obtained in fixed drawing force,and different anchor length of the bolt load-displacement curve.In the water injection case,gor the bolt pretensioned stress changing with time curves and anchor displacement curve changes over time.The results of the test show that,anchor length and bearing capacity is not simple linear relationship,and there is a critical anchor length,In anchorage length is more than the critical anchor length,increase the anchor length can't improve pulled out of ultimate bearing capacity;The influence of the water to the bearing capacity of anchor bolt is very big.

According to basalt areas of the soil slope weathering in Guizhou, design the slope anchor model test in room. Respectively compare the single anchor strain distribution curve, before and after seepage, with different loading time, and magnitude of different strain distribution curve of the same column in the slope, sliding surface and anchor point at the end of a period comparison analysis research. Test shows that, curve distribution along the length of the anchor rod anchor strain is higher in the middle, lower at the ends; anchor deformation mainly on the top of the first row; the slope of feet and peak strain is higher than other parts, and more likely to damage; the early strain will be a negative value, and the bolts are composite components mainly affording hydraulic tensile stress.