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Mechanical behavior of soils is highly dependent on their composition. In order to gain better understanding of change in strength parameters according to soil composition, direct shear tests were conducted in this study. Sand was selected as preliminary soil type. Fine grained soil was mixed with sand step by step. Amount of fine grains was increased 10% in each step. Eleven different mixtures were obtained and standard proctor tests were conducted to determine highest unit weight and optimum water content for each mixture. Then, direct shear tests were conducted for each mixture. Four different confining pressures were chosen, and confining pressures were 9.81 kPa, 19.62 kPa, 40.81 kPa and 58.86 kPa. Shearing rate was chosen as 0.25 mm/min for sandy soils. When the tests were conducted for fine grained soils, shearing rate was chosen as 0.065 mm/min. Results of this study might help understanding of failure of soil under low confinement.

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ÖzDepremler ve heyelanlar toplum hayatını derinden etkileyen doğal afetlerin başında gelmektedir. Özellikle dağlık bölgelerde meydana gelen heyelanlar, her yıl can kaybına ve hasara sebep olmaktadır. Son yıllarda heyelana duyarlı bölgelerin belirlenmesi çalışmaları oldukça yaygınlaşmıştır. Heyelan duyarlılık analizlerinin yapılması hem mühendislik projelerinin planlanmasını kolaylaştıracak hem de meydana gelebilecek zararların azaltılmasını sağlayacaktır. Bu çalışmada, İran'ın Ardabil (Erdebil) bölgesindeki Saqezchi'in heyelan duyarlılık haritaları oluşturulmuştur. Heyelan duyarlılık analizinde arazi kullanımı, yağış miktarı, faylara uzaklık, litoloji, akarsu ağlarına uzaklık, yükselti, eğim, bakı ve yola uzaklık parametreleri kullanılmıştır. Çalışmada heyelan duyarlılık haritası oluşturulurken Analitik Hiyerarşi Süreci (AHP) yöntemi ve Coğrafi Bilgi Sistemleri (CBS) kullanılmıştır. Oluşturulan duyarlılık haritaları, "çok yüksek, yüksek, orta, düşük ve çok düşük" duyarlı alanlar olmak üzere 5 grup altında sınıflandırılmıştır.

The purpose of this study is to form the impermeable layer as landfill liner to store boron mine waste water. Boron mine waste water was supplied from Emet (district of Kutahya city, Turkey) Boron Factory. In this study, five different mixtures were used. These mixtures were natural soil, natural soil mixed with Na-bentonite (10%, 20%, 30% and 40%). A miniature landfill tank (240 cm × 120 cm × 60 cm) with six sections was constructed and mixtures were compacted in the container according to the optimum water content. After curing period, 120 liter boron mine waste water was poured into each section and impermeability of mixtures was observed. As a result of observations, it was seen that natural soil was totally inefficient material. Natural soil started leaking on the fifth day and waste water was completely leaked within 27 days. Natural soil mixed Na-bentonite (40%) mixture gave the best result among them. The thickness of impermeable layer formed with natural soil mixed Na-bentonite (40%) can be offered between 40 and 60 cm for the in-situ application.

One of the most critical problems in the construction sector is the inadequate bearing capacities of subsoils. To solve this problem, various soil improvement methods are employed. Soil improvement is defined as the improvement in soil properties to the desired level by using various methods when the soil is not suitable for superstructure loads. Various types of soil improvement methods exist, and their application depends on the construction site, soil properties, earthquake zone, application time, and cost. One of the most widely used methods recently is the deep soil mixing method. In this study, a laboratory-scale deep soil mixing device is first developed; subsequently, the effects of injection pressure, mixing time, and dosing parameters on application are investigated. Deep soil mixing columns are prepared using different injection pressures, mixing times, and dosages and then subjected to the unconfined compression test. Results show that the effects of injection pressure, cement dosage, and mixing time on the unconfined compressive strength of deep soil mixing samples vary based on the initial soil properties.

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Orman yangınları, farklı sebeplerle başlayıp geniş alanlara yayılabilen büyük bir çevre felaketidir. Ülkemizde Akdeniz ve Ege bölgeleri, başta olmak üzere yaklaşık 12 milyon hektar ormanlık alan yangın konusunda potansiyel risk taşımaktadır. Orman yangını risk bölgeleri, yangının kolayca başlayabileceği ve diğer alanlara hızlıca yayılabileceği yerler olarak bilinmektedir. Doğayı kontrol etmek imkânsızdır, fakat orman yangını risk bölgelerini haritalayarak yangın yayılımını en aza indirmek ve hasarı azaltmak mümkündür. Orman Genel Müdürlüğü'nün 2018 yılı verilerine göre ülkemizde toplam 2167 adet orman yangını olduğu ve 299 adet orman yangınıyla Muğla ilinin 1.sırada olduğu görülmektedir. Menteşe,