High cutting slopes with nearly horizontal soft-hard alternant strata are widely distributed in three gorges reservoir area, the soft and hard rocks are mainly mud stone and sandstone of Jurassic system. Sliding failure of this kind of slope is also the main geo-hazards in this area. Firstly, this paper analyzed the impact of topography, water as well as the differential weathering and combination characteristics of soft and hard rocks etc. on the sliding failure of slopes; secondly, sliding failure modes of this kind of slope were classified into four types including circular sliding, sliding along the extroversion structural surface, sliding along the mudded intercalation and wedge sliding, they were analyzed combined with case study. And lastly, support methods against the certain failure mode were put forward. The research results are significant to the support and treatment of high cutting slopes in Three gorges area.

A high efficiency, informatization, automation water-level monitoring system was designed. It was very helpful to improve the level of hydrological forecast and the level of geological disasters forecast.This water-level monitoring system was based on a 32 bits LM3S615 embedded microcontroller as the main control unit. It consisted of four modules: the main control unit(LM3S615),the signal acquisiton and conduction module, the power supply module and the wireless transceiver module. In the system, the redundant power supply circuit was designed to improve the system’s reliability further. After the test, the operation of the system has been able to complete the expected target, and achieve the performance requirement. At the same time, it also has the very good instruction function for the development of related industrial products.

In order to meet the mobile robot’s accuracy and speed requirements in processing obstacle information based on the study of the principle of ultrasonic and infrared distance measurement, the ultrasonic infrared measurements system is designed using Mega16L microcontroller. The hardware of the system, data fusion and software components were studied. Bayes estimation for the data fusion, which can greatly improve the measurement accuracy, was used. The human-computer interface and back panel algorithm were developed with the development language of LabVIEW. Experimental results show that the measurement error of the combined measurement system is in ± 1mm between 0 ~ 300cm, which can meet the design requirements and flexible operation.

As the main geohazard triggered by Wenchuan earthquake, landslide is widely distributed. It caused many people lost their lives and incipient fault. This paper analyzes the genesis of these landslides from the aspects of geomorphy, geological structure of slope body, rock characters, earthquake motion, stable condition of slope, weathering effect and stream action. Strong earthquake motion near the fracture zone and geological structure of slope body are the main reasons caused the slope failure. Take Wangjiayan landslide as the typical example, the genesis of earthquake-induced landslide is analyzed. Strong earthquake motion near the fracture zone and the extroversion structural surfaces are the main reasons caused the slide, and great slope and instable state of slope can also promote the slop failure. Failure process of slope is also analyzed.

Jinoping No.1 is a dominant reservoir cascade hydropower station which locates at the downstream of Yalong river. The underground powerhouse locates at the right bank of the dam, lithology is marble that belongs to the second member of Zagunao group. It is constructed at region with very complicated geological conditions and high geo-stress. Concrete cracking, spalling and steel buckling and bending occurred at the downstream crown after supporting. This paper analysed the causes of deformation and failure through geological analysis and numerical simulation, and concluded that deformation and failure mainly occurred at the region where the quality of surrounding rock belongs to Ⅲ1 and had nothing to do with the unstable block cut by cracks; stress field of surrounding rock varied continueously with the proceeding of successive excavation of underground powerhouse, so the compressive stress and shear stress concentration occurred which caused the compression and shear failure of downstream crown and made it bending to the free face. It is significant to the further enforcement of this project and to the research on other similar underground caverns theoretically and practically.