The thiobarbituric acid reactive substances assay is an easy and quick assay for the assessment in plants of lipid peroxidation, in which malondialdehyde is derivatized. To analyze the applicability of this method, the malondialdehyde concentrations in the leaves of different plants were measured by the thiobarbituric acid method. For further separation of the interfering substances, fractional extraction and gas chromatography-mass spectrometry were used in this research. The results suggest that the lipid peroxidation is accurately measured by the thiobarbituric acid method with trichloroacetic acid as the extraction solution in most plants. However, the method was not suitable for measuring the malondialdehyde concentration in golden privet (Ligustrum × vicaryi) leaves. Negative malondialdehyde concentrations were obtained in golden privet leaves by this method.

Logistic regression model refers a regress analysis contains two types of variants. In geohazard analysis, each geological factor can be defined as independent variable, whether a geohazard happened or not can be defined as a dependent variable. 1 represents an occurrence of a hazard while 0 represents a hazard doesn’t break out. Because those factors aren’t continual variable, lineal regress is inadequate to deduce the relationship of such kind of independent and dependent variable. Therefore using logistic regress method is a feasible way to solve such technique problem.

A numerical simulation method of the rock bolts non-destructive testing based on ANSYS is presented. ANSYS/ LS-DYNA which is a kind of software of rock bolts dynamic finite domain analysis is used to establish a three-dimension model, after sine curve excitation is loaded, the reflection curve of naked rock bolts, or rock bolts with different defects are got, and the relationship curve between elastic modulus and stress wave velocity are got correspondingly. Experiment result proved that the aboved method was satisfied to simulate the stress wave propagation and the reflection situation in the rock bolts.

To investigate the seismic performance of underground structures under the action of the structure-soil interface, in this study, experiments were performed using plexiglass structures (two pieces) and a concrete structure (one piece) as the research objects. The surface of one plexiglass structure was prepainted with a layer of cement mortar as the contact surface between the structure and soil, and the other plexiglass structure was not treated and used for comparison. A rigid model box measuring 2.25 m × 2.25 m × 1.5 m was placed on a 3 m × 3 m shaking table, and the box was filled with the configured model soil and the underground structure prepared in advance. Input transverse uniform excitation was imparted to the whole system. A shaking table model test was performed on the underground structures to analyse the acceleration response, stress strain, and earth pressure changes in the underground structure, and the influence of the contact surface on the seismic dynamics of the underground structure was evaluated. The test results showed that under uniform excitation, the dynamic characteristics of the underground structures were greatly affected by the intensity and depth of the seismic waves. (1) When the soil-structure contact was considered, the stress and strain of the structures increased significantly, and the stress-strain value was significantly greater than the stress-strain value of the soil-structure interface in a fully bonded state. (2) There were inconsistencies between the acceleration peak curve of the plexiglass structure considering the contact effect and the acceleration peak curve of the plexiglass structure without considering the contact effect. The difference between the two lies mainly in the corresponding maximum peak acceleration and the Fourier spectrum amplitude. With respect to the value and frequency composition, regardless of whether the input acceleration intensity was 0.2 g or 0.5 g, the peak acceleration of the organic structure was greater when the contact surface effect was considered than without the contact surface effect. Therefore, the structure-soil interface needs to be considered in actual engineering. The presence of the contact surface improves the safety of the structure and is helpful for seismic design. The results of this study provide a basis for further research on the influence of soil-pipe contact on the seismic response of underground structures.

There are 15 large-scaled rock landslides in the middle reach of Daduhe River in the western Sichuan. As they even dammed the Daduhe River for a long time, the dammed accumulation are well widely developed, relatively wide bottom valley have been formed in the reach. Now, there are about 80000 people lived in the valley of the reach, as the region is in high intensity (VIII-IX), the latest large earthquake (magnitude is 7.7)happened in 1876 and dammed the River, causing over ten thousand people die in the huge flood after the dam broke. As the construction velocity is faster than before, the hydropower station, highway, new village construction are put on the schedule, but people seem forgetting the historical earthquakes and seismic landside’s impact, hidden dangers may come at any time. The present paper tries to introduce the characteristics of the landslides and its environment impacts such as deep overburden, soft soil, sand liquefaction and landslide reactive. So as to call peoples’ attention for the environment during they are engaged in the large scale construction. Based on the RS interpretation and field comprehensive investigations, 15 large scaled rock landslides have been found in the reach, the volume of each is over 1000,000m3, although the remains are stable on the whole, the front part is potential unstable, if they are active triggered by the future earthquake or storm, they can dam the Daduhe River again and cause huge geo-hazards. Several ideas can be concluded as follows：(1)The reach is composed of Proterozoic acid intrusive rock and underwent several large tectonic movements, the rock mass is cut by structural planes formed in the different tectonic epoch; (2) The middle reach of Daduhe River is one part of SN strike tectonic belt in China, the main advantageous structural planes is SN strike, which is parallel to the flow direction of Daduhe River; (3) The reach is within a high intensity region with over VIII degrees, seismic landslides are well developed and they are easily reactive in the future, people confront with the deep overburden, soft soil, sand liquefaction; (4) the villages and town is generally located on the second Terrace and easily influenced by the seismic large slides, their vulnerability is high; (5) engineering measurements are necessary to protect the town villages and it is urgent to built disaster warning system.