Effect of the addition of polypropylene fibers on the swelling characteristics of clayey expansive soil

This research studies the effect of the addition of polypropylene fibers (PF) on the properties of the swelling clayey soil. The effect of PF on the shear strength of the clayey soil has been studied and the results show that adding PF, up to specific value, increases the shear strength. Beyond this value of addition, the shear strength decreases. The increase in shear strength was about (100-110) % and the optimal addition ratio was determined.

Effect of initial water content on strength and swelling characteristics of clayey expansive soils

Clayey expansive soils are fine grained soil with a low strength. Its swelling potential and shear strength are significantly affected by the water content. This research aims to study the effect of the initial water content on both shear strength and the required displacement to reach the maximum strength.

Laboratory study to improve the expansive soil by adding chemical Stabilizers

The purpose of this research is to study the improvement of soil properties by the addition of lime in certain percentages. The soil used in this study was obtained from the Baseet region, which is located by the Syrian coast. We have studied the effect of lime on the consistency, the swell characteristics and the shear strength of soil. The results of this study have shown a remarkable reduction of both liquid and shrinkage limits, and the plasticity index with the increase of lime percentage. As for plasticity limit, it increases in the beginning then decreases slightly with the rising of lime percentage. For the volumetric variation, the susceptibility of swelling and the shrinkage of improved soil with lime decrease, and the free swelling and the swelling pressure become almost negligible with 4% of lime. Based on the shear strength results, we can indicate a notable increase in the friction angle and cohesion of soil with increasing of lime percentage up to 8% of lime. After that, these two factors decrease.

The Effect of Organic Matter's Content on the Engineering Properties of Expansive Soils and Treatment Methods

This paper aims at investigating the effect of organic matter content on the engineering properties of the soil. The effect of the organic matter on both the consistency limits and strength have been investigated. The results show that the organic matter increases both the plasticity and the strength of soil. Mathematical formula is presented in which the unconfined compression strength of the soil is related to the organic matter content. It was concluded that increasing the organic matter content increases the displacement corresponding to the maximum shear stress. In addition, the effect of the organic matter has been studied and the results show that the organic matter increases the compressibility of the soil. Stabilizing the soil with cement has been investigated as well. The results show that adding the cement to the soil improves the strength of the soil and decreases its swelling potential. Depending on the organic matter content, a mathematical formula is presented to determine the required cement ratio to treat the soil to decrease its swelling potential.

The effect of the climate factor on soil formation and some soil properties in Hauran plateau

In order to evaluate the important role of climate on soil formation, three different locations (Nawa, Dael and Nasib) in southern part of Syria, representing the North West, Middle and Southern parts of Hauran Plateau were selected and differ mainly in the amount of annual precipitation and relatively with other factors. Three profiles, replicated three times, were prepared one profile for each area.

Lung Volume Reduction for Lung Emphysema

This study presents our experince in lung volume reductionby surgery. Patients and Methodls : ٢٠ patients underwent lung volume reduction during the period from ١٩٩٧-٢٠٠٠, There were ١٥ men and ٥ women ranging in age from ٢٢-٧٢ years. Chronic obstructive diffuse emphysema was found in ٨ patients, bollous emphysema in ١٢, of them ٤ with unilateral involvement, high oxygen dependency ٢ patients, steroid use ١ , ٨ patients were operated on using thoracoscopic surgery, ١٠through unilateral thoracotomy and ٢ through median sternotomy, Operation included excision of ٢٠٪-٣٠٪of the volume of each lung with the use of linear stapling. Results: There has been ٥٪ perioperatve mortality, and the most common complication was air leaking (٧ patients). Conclusion : Lung volume reduction may be of significant value for selected patients with lung emphysema especially younger patients with diffuse emphysema, bollous emphysema, unilateral disease and combined emphysema with surgical lung disease as hydatid cyst or tumors.