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Luochuan loess engineering properties and foundation treatment

Author: ZhouNi
Tutor: ZhaoJingBo
School: Shaanxi Normal University
Course: Environmental Engineering
Keywords: engineering nature collapsible foundation treatment Luochuan
CLC: TU444
Type: Master's thesis
Year: 2013
Downloads: 44
Quote: 0
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Abstract


Loess collapsibility is one of the most important features of the loess. In actual project, loess collapsible caused the destruction of buildings, which leads to great economic loss. So it is important for architectural design to analysis the engineering nature of the loess in construction plant.Based on the experimental determination of loess collapsible and engineering nature of loess, analysis changes of collapsible loess profile, choose the suitable methods to treat Luochuan loess foundation, which is an important basis for future engineering practice. Through analysis, this paper obtained the following figures and programs:(1)The porosity of Luochuan loess is40%to54%. The moisture content of loess are between11%to20%.The moisture content of Luochuan loess is significantly less than the ancient soil moisture content. The loess has lost collapsible when Luochuan loess saturation (Sr)>55%. The loess void ratio change between0.8and1.0, the majority of0.9to1.0. The loess collapsibility is relatively weak, and more for non-collapsible loess when the liquid limit is between29.6%and29.9%.(2) Collapsible coefficient of Luochuan loess decreases with the increasing soil samples severe. With the increasing dry density, collapsibility coefficient of Luochuan loess is gradually smaller. And collapsibility coefficient is increasing with increasing loess void ratio. The loess has a strong collapsible when the liquid limit within the range of29.5%to29.9%. Outside that range, with increasing or decreasing the liquid limit, collapsible was weakening.(3) The collapsibility of Luochuan loess tends to decrease with increasing depth in vertical. The experimental data show that collapsible loess depth reached about28m.(4) Analysis collapsible sensitivity of Luochuan loess by using the sensitivity index and the result showed that collapsible sensitivity of Luochuan loess is strong.(5) According to the evaluation method of the collapsibility coefficient judged collapsible level of Luochuan loess. The result shows that collapsible level is IV in Luochuan and which is very serious. (6) Select suitable foundation treatment for the difficult buildings features by combing with the engineering nature of Luochuan loess, which has reference value to engineering practice.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Various types of soil and foundation > Loess and foundation
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