Tthe main causes of ecological degradation include irrational utilization and traditional economic modes which embodied population rapid growth, destroying forest and opening up wasteland, tillage in steep slope, excess graze, mangling trees, single tree variety, irrational utilizing land and low level industrial structure except for natural reasons such as water, soil and slope.

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For some rock slopes, which have not distinct failure surface, but have complicated structure or load on the top and so on, a stability analysis of this type slopes by finite element method is presented, the failure surface is defined by certain rule or strain zone from the computed model, and then the safety factor of the rock slope is abtained by finite element method and limit equilibrium methodAt last, using ANSYS , a famous commercial finite element analysis software, a example of high-steep slope which is bearing the load of the LongGe Mansion is presented, the stability of this slope is studied, as a paradign the the stability evalution of complicated high-steep slope under the action of load of building , the chapter gives some meritable reference in stability assessment of rock slopes using numerical simulation by three-dimension elastic-plastic finite element.

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The faulted scarp type slope break belt controlled the development of the near shore sub-aqueous fan system. The faulted terrace type steep slope break belt controlled the development of the fan-deltas and sub-aqueous fan system. The gentle slope type slope break belt controlled the development of the fan delta system. The inner basin type slope break belt controlled the off shore sub-lacustrine fan system in the basin-level falling stage.

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steep slope：陡坡

陡崖(cliff)或陡坡(steep slope)均是地表過程的階段性地貌形跡(geomorphologic formality),三峽庫區(qū)內(nèi)云陽至江津段的地層主要為中生代侏羅系砂巖和泥巖互層組合,巖層傾角較小,一般在15°以內(nèi);砂巖厚度較大,一般30~150m,泥巖厚度較小,

steep slope：陡峭斜坡;陡峭山坡

steep ramp 陡斜路;陡坡道 | steep slope 陡峭斜坡;陡峭山坡 | Steering Committee on Land Supply for Housing 房屋用地供應(yīng)督導(dǎo)委員會

steep slope：急坡

steep fault 陡角斷層 | steep slope 急坡 | steinheilite 堇青石